cpp-common/bt2c/uuid.hpp \
cpp-common/bt2c/vector.hpp \
cpp-common/bt2s/make-unique.hpp \
+ cpp-common/bt2s/optional.hpp \
cpp-common/nlohmann/json.hpp \
- cpp-common/optional.hpp \
- cpp-common/string_view.hpp
+ cpp-common/string_view.hpp \
+ cpp-common/vendor/optional-lite/optional.hpp
## This target generates an include file that contains the git version
## string of the current branch, it must be continuously updated when
#include <babeltrace2/babeltrace.h>
#include "cpp-common/bt2c/uuid-view.hpp"
-#include "cpp-common/optional.hpp"
+#include "cpp-common/bt2s/optional.hpp"
#include "borrowed-object.hpp"
#include "exc.hpp"
bt_clock_class_set_uuid(this->libObjPtr(), uuid);
}
- nonstd::optional<bt2c::UuidView> uuid() const noexcept
+ bt2s::optional<bt2c::UuidView> uuid() const noexcept
{
const auto uuid = bt_clock_class_get_uuid(this->libObjPtr());
return bt2c::UuidView {uuid};
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
template <typename LibValT>
#include <babeltrace2/babeltrace.h>
#include "common/assert.h"
-#include "cpp-common/optional.hpp"
+#include "cpp-common/bt2s/optional.hpp"
#include "borrowed-object-iterator.hpp"
#include "borrowed-object.hpp"
this->libObjPtr(), index)};
}
- nonstd::optional<Mapping> operator[](const char * const label) const noexcept
+ bt2s::optional<Mapping> operator[](const char * const label) const noexcept
{
const auto libObjPtr = internal::CommonEnumerationFieldClassSpec<MappingT>::mappingByLabel(
this->libObjPtr(), label);
return Mapping {libObjPtr};
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
- nonstd::optional<Mapping> operator[](const std::string& label) const noexcept
+ bt2s::optional<Mapping> operator[](const std::string& label) const noexcept
{
return (*this)[label.data()];
}
this->libObjPtr(), index)};
}
- nonstd::optional<Member> operator[](const char * const name) const noexcept
+ bt2s::optional<Member> operator[](const char * const name) const noexcept
{
const auto libObjPtr =
internal::CommonStructureFieldClassSpec<LibObjT>::memberByName(this->libObjPtr(), name);
return Member {libObjPtr};
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
- nonstd::optional<Member> operator[](const std::string& name) const noexcept
+ bt2s::optional<Member> operator[](const std::string& name) const noexcept
{
return (*this)[name.data()];
}
this->libObjPtr(), index)};
}
- nonstd::optional<Option> operator[](const char * const name) const noexcept
+ bt2s::optional<Option> operator[](const char * const name) const noexcept
{
const auto libObjPtr =
internal::CommonVariantFieldClassSpec<LibObjT>::optionByName(this->libObjPtr(), name);
return Option {libObjPtr};
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
- nonstd::optional<Option> operator[](const std::string& name) const noexcept
+ bt2s::optional<Option> operator[](const std::string& name) const noexcept
{
return (*this)[name.data()];
}
}
}
- void appendOption(const nonstd::optional<std::string>& name, const FieldClass fc) const
+ void appendOption(const bt2s::optional<std::string>& name, const FieldClass fc) const
{
this->appendOption(name ? name->data() : nullptr, fc);
}
return Option {_Spec::optionByIndex(this->libObjPtr(), index)};
}
- nonstd::optional<Option> operator[](const char * const name) const noexcept
+ bt2s::optional<Option> operator[](const char * const name) const noexcept
{
const auto libObjPtr = _Spec::optionByName(this->libObjPtr(), name);
return Option {libObjPtr};
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
- nonstd::optional<Option> operator[](const std::string& name) const noexcept
+ bt2s::optional<Option> operator[](const std::string& name) const noexcept
{
return (*this)[name.data()];
}
}
}
- void appendOption(const nonstd::optional<std::string>& name, const FieldClass fc,
+ void appendOption(const bt2s::optional<std::string>& name, const FieldClass fc,
const typename Option::RangeSet ranges) const
{
this->appendOption(name ? name->data() : nullptr, fc, ranges);
#include <babeltrace2/babeltrace.h>
#include "common/assert.h"
-#include "cpp-common/optional.hpp"
+#include "cpp-common/bt2s/optional.hpp"
#include "borrowed-object.hpp"
#include "field-class.hpp"
return CommonField<LibObjT> {_Spec::memberFieldByIndex(this->libObjPtr(), index)};
}
- nonstd::optional<CommonField<LibObjT>> operator[](const char * const name) const noexcept
+ bt2s::optional<CommonField<LibObjT>> operator[](const char * const name) const noexcept
{
const auto libObjPtr = _Spec::memberFieldByName(this->libObjPtr(), name);
return CommonField<LibObjT> {libObjPtr};
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
- nonstd::optional<CommonField<LibObjT>> operator[](const std::string& name) const noexcept
+ bt2s::optional<CommonField<LibObjT>> operator[](const std::string& name) const noexcept
{
return (*this)[name.data()];
}
return this->field().has_value();
}
- nonstd::optional<CommonField<LibObjT>> field() const noexcept
+ bt2s::optional<CommonField<LibObjT>> field() const noexcept
{
const auto libObjPtr = _Spec::field(this->libObjPtr());
return CommonField<LibObjT> {libObjPtr};
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
};
#include <babeltrace2/babeltrace.h>
#include "common/common.h"
-#include "cpp-common/optional.hpp"
+#include "cpp-common/bt2s/optional.hpp"
#include "component-port.hpp"
#include "exc.hpp"
return ConstComponent {bt_message_iterator_borrow_component(this->libObjPtr())};
}
- nonstd::optional<ConstMessageArray> next() const
+ bt2s::optional<ConstMessageArray> next() const
{
bt_message_array_const libMsgsPtr;
std::uint64_t count;
/* Caller becomes the owner of the contained messages */
return ConstMessageArray::wrapExisting(libMsgsPtr, count);
case BT_MESSAGE_ITERATOR_NEXT_STATUS_END:
- return nonstd::nullopt;
+ return bt2s::nullopt;
case BT_MESSAGE_ITERATOR_NEXT_STATUS_AGAIN:
throw TryAgain {};
case BT_MESSAGE_ITERATOR_NEXT_STATUS_MEMORY_ERROR:
#include "common/assert.h"
#include "cpp-common/bt2/clock-snapshot.hpp"
#include "cpp-common/bt2/trace-ir.hpp"
-#include "cpp-common/optional.hpp"
+#include "cpp-common/bt2s/optional.hpp"
#include "borrowed-object.hpp"
#include "internal/utils.hpp"
bt_message_stream_beginning_set_default_clock_snapshot(this->libObjPtr(), val);
}
- nonstd::optional<ConstClockSnapshot> defaultClockSnapshot() const noexcept
+ bt2s::optional<ConstClockSnapshot> defaultClockSnapshot() const noexcept
{
const bt_clock_snapshot *libObjPtr;
const auto state = bt_message_stream_beginning_borrow_default_clock_snapshot_const(
return ConstClockSnapshot {libObjPtr};
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
Shared shared() const noexcept
bt_message_stream_end_set_default_clock_snapshot(this->libObjPtr(), val);
}
- nonstd::optional<ConstClockSnapshot> defaultClockSnapshot() const noexcept
+ bt2s::optional<ConstClockSnapshot> defaultClockSnapshot() const noexcept
{
const bt_clock_snapshot *libObjPtr;
const auto state = bt_message_stream_end_borrow_default_clock_snapshot_const(
return ConstClockSnapshot {libObjPtr};
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
Shared shared() const noexcept
bt_message_discarded_events_set_count(this->libObjPtr(), count);
}
- nonstd::optional<std::uint64_t> count() const noexcept
+ bt2s::optional<std::uint64_t> count() const noexcept
{
std::uint64_t count;
const auto avail = bt_message_discarded_events_get_count(this->libObjPtr(), &count);
return count;
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
Shared shared() const noexcept
bt_message_discarded_packets_set_count(this->libObjPtr(), count);
}
- nonstd::optional<std::uint64_t> count() const noexcept
+ bt2s::optional<std::uint64_t> count() const noexcept
{
std::uint64_t count;
const auto avail = bt_message_discarded_packets_get_count(this->libObjPtr(), &count);
return count;
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
Shared shared() const noexcept
#define BABELTRACE_CPP_COMMON_BT2_SHARED_OBJECT_HPP
#include "common/assert.h"
-#include "cpp-common/optional.hpp"
+#include "cpp-common/bt2s/optional.hpp"
namespace bt2 {
}
}
- nonstd::optional<ObjT> _mObj;
+ bt2s::optional<ObjT> _mObj;
};
} /* namespace bt2 */
#include <babeltrace2/babeltrace.h>
-#include "cpp-common/optional.hpp"
+#include "cpp-common/bt2s/optional.hpp"
#include "borrowed-object.hpp"
#include "clock-class.hpp"
Class cls() const noexcept;
_Stream stream() const noexcept;
- nonstd::optional<_Packet> packet() const noexcept;
+ bt2s::optional<_Packet> packet() const noexcept;
- nonstd::optional<_StructureField> payloadField() const noexcept
+ bt2s::optional<_StructureField> payloadField() const noexcept
{
const auto libObjPtr = _Spec::payloadField(this->libObjPtr());
return _StructureField {libObjPtr};
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
- nonstd::optional<_StructureField> specificContextField() const noexcept
+ bt2s::optional<_StructureField> specificContextField() const noexcept
{
const auto libObjPtr = _Spec::specificContextField(this->libObjPtr());
return _StructureField {libObjPtr};
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
- nonstd::optional<_StructureField> commonContextField() const noexcept
+ bt2s::optional<_StructureField> commonContextField() const noexcept
{
const auto libObjPtr = _Spec::commonContextField(this->libObjPtr());
return _StructureField {libObjPtr};
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
};
_Stream stream() const noexcept;
- nonstd::optional<_StructureField> contextField() const noexcept
+ bt2s::optional<_StructureField> contextField() const noexcept
{
const auto libObjPtr = _Spec::contextField(this->libObjPtr());
return _StructureField {libObjPtr};
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
Shared shared() const noexcept
} /* namespace internal */
template <typename LibObjT>
-nonstd::optional<typename CommonEvent<LibObjT>::_Packet>
-CommonEvent<LibObjT>::packet() const noexcept
+bt2s::optional<typename CommonEvent<LibObjT>::_Packet> CommonEvent<LibObjT>::packet() const noexcept
{
const auto libObjPtr = _Spec::packet(this->libObjPtr());
return _Packet {libObjPtr};
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
namespace internal {
bt_trace_set_uuid(this->libObjPtr(), uuid.begin());
}
- nonstd::optional<bt2c::UuidView> uuid() const noexcept
+ bt2s::optional<bt2c::UuidView> uuid() const noexcept
{
const auto uuid = bt_trace_get_uuid(this->libObjPtr());
return bt2c::UuidView {uuid};
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
std::uint64_t length() const noexcept
return _Stream {_Spec::streamByIndex(this->libObjPtr(), index)};
}
- nonstd::optional<_Stream> streamById(const std::uint64_t id) const noexcept
+ bt2s::optional<_Stream> streamById(const std::uint64_t id) const noexcept
{
const auto libObjPtr = _Spec::streamById(this->libObjPtr(), id);
return _Stream {libObjPtr};
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
void environmentEntry(const char * const name, const std::int64_t val) const
return ConstEnvironmentEntry {name, ConstValue {libObjPtr}};
}
- nonstd::optional<ConstValue> environmentEntry(const char * const name) const noexcept
+ bt2s::optional<ConstValue> environmentEntry(const char * const name) const noexcept
{
const auto libObjPtr =
bt_trace_borrow_environment_entry_value_by_name_const(this->libObjPtr(), name);
return ConstValue {libObjPtr};
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
- nonstd::optional<ConstValue> environmentEntry(const std::string& name) const noexcept
+ bt2s::optional<ConstValue> environmentEntry(const std::string& name) const noexcept
{
return this->environmentEntry(name.data());
}
static_cast<bt_event_class_log_level>(logLevel));
}
- nonstd::optional<LogLevel> logLevel() const noexcept
+ bt2s::optional<LogLevel> logLevel() const noexcept
{
bt_event_class_log_level libLogLevel;
const auto avail = bt_event_class_get_log_level(this->libObjPtr(), &libLogLevel);
return static_cast<LogLevel>(libLogLevel);
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
void emfUri(const char * const emfUri) const
}
}
- nonstd::optional<_StructureFieldClass> payloadFieldClass() const noexcept
+ bt2s::optional<_StructureFieldClass> payloadFieldClass() const noexcept
{
const auto libObjPtr = _Spec::payloadFieldClass(this->libObjPtr());
return _StructureFieldClass {libObjPtr};
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
void specificContextFieldClass(const StructureFieldClass fc) const
}
}
- nonstd::optional<_StructureFieldClass> specificContextFieldClass() const noexcept
+ bt2s::optional<_StructureFieldClass> specificContextFieldClass() const noexcept
{
const auto libObjPtr = _Spec::specificContextFieldClass(this->libObjPtr());
return _StructureFieldClass {libObjPtr};
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
template <typename LibValT>
BT_ASSERT(status == BT_STREAM_CLASS_SET_DEFAULT_CLOCK_CLASS_STATUS_OK);
}
- nonstd::optional<_ClockClass> defaultClockClass() const noexcept
+ bt2s::optional<_ClockClass> defaultClockClass() const noexcept
{
const auto libObjPtr = _Spec::defaultClockClass(this->libObjPtr());
return _ClockClass {libObjPtr};
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
std::uint64_t length() const noexcept
return _EventClass {_Spec::eventClassByIndex(this->libObjPtr(), index)};
}
- nonstd::optional<_EventClass> eventClassById(const std::uint64_t id) const noexcept
+ bt2s::optional<_EventClass> eventClassById(const std::uint64_t id) const noexcept
{
const auto libObjPtr = _Spec::eventClassById(this->libObjPtr(), id);
return _EventClass {libObjPtr};
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
void packetContextFieldClass(const StructureFieldClass fc) const
}
}
- nonstd::optional<_StructureFieldClass> packetContextFieldClass() const noexcept
+ bt2s::optional<_StructureFieldClass> packetContextFieldClass() const noexcept
{
const auto libObjPtr = _Spec::packetContextFieldClass(this->libObjPtr());
return _StructureFieldClass {libObjPtr};
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
void eventCommonContextFieldClass(const StructureFieldClass fc) const
}
}
- nonstd::optional<_StructureFieldClass> eventCommonContextFieldClass() const noexcept
+ bt2s::optional<_StructureFieldClass> eventCommonContextFieldClass() const noexcept
{
const auto libObjPtr = _Spec::eventCommonContextFieldClass(this->libObjPtr());
return _StructureFieldClass {libObjPtr};
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
template <typename LibValT>
return _StreamClass {_Spec::streamClassByIndex(this->libObjPtr(), index)};
}
- nonstd::optional<_StreamClass> streamClassById(const std::uint64_t id) const noexcept
+ bt2s::optional<_StreamClass> streamClassById(const std::uint64_t id) const noexcept
{
const auto libObjPtr = _Spec::streamClassById(this->libObjPtr(), id);
return _StreamClass {libObjPtr};
}
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
template <typename LibValT>
#include "common/assert.h"
#include "common/common.h"
-#include "cpp-common/optional.hpp"
+#include "cpp-common/bt2s/optional.hpp"
#include "borrowed-object-iterator.hpp"
#include "borrowed-object.hpp"
}
template <typename KeyT>
- nonstd::optional<CommonValue<LibObjT>> operator[](KeyT&& key) const noexcept
+ bt2s::optional<CommonValue<LibObjT>> operator[](KeyT&& key) const noexcept
{
return this->asMap()[std::forward<KeyT>(key)];
}
return this->length() == 0;
}
- nonstd::optional<CommonValue<LibObjT>> operator[](const char * const key) const noexcept
+ bt2s::optional<CommonValue<LibObjT>> operator[](const char * const key) const noexcept
{
const auto libObjPtr =
internal::CommonMapValueSpec<LibObjT>::entryByKey(this->libObjPtr(), key);
if (!libObjPtr) {
- return nonstd::nullopt;
+ return bt2s::nullopt;
}
return CommonValue<LibObjT> {libObjPtr};
}
- nonstd::optional<CommonValue<LibObjT>> operator[](const std::string& key) const noexcept
+ bt2s::optional<CommonValue<LibObjT>> operator[](const std::string& key) const noexcept
{
return (*this)[key.data()];
}
--- /dev/null
+/*
+ * Copyright (c) 2023 Philippe Proulx <pproulx@efficios.com>
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#ifndef BABELTRACE_CPP_COMMON_BT2S_OPTIONAL_HPP
+#define BABELTRACE_CPP_COMMON_BT2S_OPTIONAL_HPP
+
+#include "cpp-common/vendor/optional-lite/optional.hpp"
+
+namespace bt2s {
+
+template <typename T>
+using optional = nonstd::optional<T>;
+
+using nullopt_t = nonstd::nullopt_t;
+using bad_optional_access = nonstd::bad_optional_access;
+constexpr nullopt_t nullopt {nonstd::nullopt};
+
+template <typename T>
+constexpr optional<typename std::decay<T>::type> make_optional(T&& value)
+{
+ return nonstd::make_optional(std::forward<T>(value));
+}
+
+template <typename T, typename... ArgTs>
+constexpr optional<T> make_optional(ArgTs&&...args)
+{
+ return nonstd::make_optional<T>(std::forward<ArgTs>(args)...);
+}
+
+using in_place_t = nonstd::in_place_t;
+
+template <typename T>
+inline in_place_t in_place()
+{
+ return nonstd::in_place<T>();
+}
+
+template <std::size_t K>
+inline in_place_t in_place()
+{
+ return nonstd::in_place<K>();
+}
+
+template <typename T>
+inline in_place_t in_place_type()
+{
+ return nonstd::in_place_type<T>();
+}
+
+template <std::size_t K>
+inline in_place_t in_place_index()
+{
+ return nonstd::in_place_index<K>();
+}
+
+} /* namespace bt2s */
+
+#endif /* BABELTRACE_CPP_COMMON_BT2S_OPTIONAL_HPP */
+++ /dev/null
-//
-// Copyright (c) 2014-2021 Martin Moene
-//
-// https://github.com/martinmoene/optional-lite
-//
-// Distributed under the Boost Software License, Version 1.0.
-// (See accompanying file LICENSE.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-
-#pragma once
-
-#ifndef NONSTD_OPTIONAL_LITE_HPP
-#define NONSTD_OPTIONAL_LITE_HPP
-
-#define optional_lite_MAJOR 3
-#define optional_lite_MINOR 5
-#define optional_lite_PATCH 0
-
-#define optional_lite_VERSION optional_STRINGIFY(optional_lite_MAJOR) "." optional_STRINGIFY(optional_lite_MINOR) "." optional_STRINGIFY(optional_lite_PATCH)
-
-#define optional_STRINGIFY( x ) optional_STRINGIFY_( x )
-#define optional_STRINGIFY_( x ) #x
-
-// optional-lite configuration:
-
-#define optional_OPTIONAL_DEFAULT 0
-#define optional_OPTIONAL_NONSTD 1
-#define optional_OPTIONAL_STD 2
-
-// tweak header support:
-
-#ifdef __has_include
-# if __has_include(<nonstd/optional.tweak.hpp>)
-# include <nonstd/optional.tweak.hpp>
-# endif
-#define optional_HAVE_TWEAK_HEADER 1
-#else
-#define optional_HAVE_TWEAK_HEADER 0
-//# pragma message("optional.hpp: Note: Tweak header not supported.")
-#endif
-
-// optional selection and configuration:
-
-#if !defined( optional_CONFIG_SELECT_OPTIONAL )
-# define optional_CONFIG_SELECT_OPTIONAL ( optional_HAVE_STD_OPTIONAL ? optional_OPTIONAL_STD : optional_OPTIONAL_NONSTD )
-#endif
-
-// Control presence of extensions:
-
-#ifndef optional_CONFIG_NO_EXTENSIONS
-#define optional_CONFIG_NO_EXTENSIONS 0
-#endif
-
-// Control presence of exception handling (try and auto discover):
-
-#ifndef optional_CONFIG_NO_EXCEPTIONS
-# if defined(_MSC_VER)
-# include <cstddef> // for _HAS_EXCEPTIONS
-# endif
-# if defined(__cpp_exceptions) || defined(__EXCEPTIONS) || (_HAS_EXCEPTIONS)
-# define optional_CONFIG_NO_EXCEPTIONS 0
-# else
-# define optional_CONFIG_NO_EXCEPTIONS 1
-# endif
-#endif
-
-// C++ language version detection (C++20 is speculative):
-// Note: VC14.0/1900 (VS2015) lacks too much from C++14.
-
-#ifndef optional_CPLUSPLUS
-# if defined(_MSVC_LANG ) && !defined(__clang__)
-# define optional_CPLUSPLUS (_MSC_VER == 1900 ? 201103L : _MSVC_LANG )
-# else
-# define optional_CPLUSPLUS __cplusplus
-# endif
-#endif
-
-#define optional_CPP98_OR_GREATER ( optional_CPLUSPLUS >= 199711L )
-#define optional_CPP11_OR_GREATER ( optional_CPLUSPLUS >= 201103L )
-#define optional_CPP11_OR_GREATER_ ( optional_CPLUSPLUS >= 201103L )
-#define optional_CPP14_OR_GREATER ( optional_CPLUSPLUS >= 201402L )
-#define optional_CPP17_OR_GREATER ( optional_CPLUSPLUS >= 201703L )
-#define optional_CPP20_OR_GREATER ( optional_CPLUSPLUS >= 202000L )
-
-// C++ language version (represent 98 as 3):
-
-#define optional_CPLUSPLUS_V ( optional_CPLUSPLUS / 100 - (optional_CPLUSPLUS > 200000 ? 2000 : 1994) )
-
-// Use C++17 std::optional if available and requested:
-
-#if optional_CPP17_OR_GREATER && defined(__has_include )
-# if __has_include( <optional> )
-# define optional_HAVE_STD_OPTIONAL 1
-# else
-# define optional_HAVE_STD_OPTIONAL 0
-# endif
-#else
-# define optional_HAVE_STD_OPTIONAL 0
-#endif
-
-#define optional_USES_STD_OPTIONAL ( (optional_CONFIG_SELECT_OPTIONAL == optional_OPTIONAL_STD) || ((optional_CONFIG_SELECT_OPTIONAL == optional_OPTIONAL_DEFAULT) && optional_HAVE_STD_OPTIONAL) )
-
-//
-// in_place: code duplicated in any-lite, expected-lite, optional-lite, value-ptr-lite, variant-lite:
-//
-
-#ifndef nonstd_lite_HAVE_IN_PLACE_TYPES
-#define nonstd_lite_HAVE_IN_PLACE_TYPES 1
-
-// C++17 std::in_place in <utility>:
-
-#if optional_CPP17_OR_GREATER
-
-#include <utility>
-
-namespace nonstd {
-
-using std::in_place;
-using std::in_place_type;
-using std::in_place_index;
-using std::in_place_t;
-using std::in_place_type_t;
-using std::in_place_index_t;
-
-#define nonstd_lite_in_place_t( T) std::in_place_t
-#define nonstd_lite_in_place_type_t( T) std::in_place_type_t<T>
-#define nonstd_lite_in_place_index_t(K) std::in_place_index_t<K>
-
-#define nonstd_lite_in_place( T) std::in_place_t{}
-#define nonstd_lite_in_place_type( T) std::in_place_type_t<T>{}
-#define nonstd_lite_in_place_index(K) std::in_place_index_t<K>{}
-
-} // namespace nonstd
-
-#else // optional_CPP17_OR_GREATER
-
-#include <cstddef>
-
-namespace nonstd {
-namespace detail {
-
-template< class T >
-struct in_place_type_tag {};
-
-template< std::size_t K >
-struct in_place_index_tag {};
-
-} // namespace detail
-
-struct in_place_t {};
-
-template< class T >
-inline in_place_t in_place( detail::in_place_type_tag<T> /*unused*/ = detail::in_place_type_tag<T>() )
-{
- return in_place_t();
-}
-
-template< std::size_t K >
-inline in_place_t in_place( detail::in_place_index_tag<K> /*unused*/ = detail::in_place_index_tag<K>() )
-{
- return in_place_t();
-}
-
-template< class T >
-inline in_place_t in_place_type( detail::in_place_type_tag<T> /*unused*/ = detail::in_place_type_tag<T>() )
-{
- return in_place_t();
-}
-
-template< std::size_t K >
-inline in_place_t in_place_index( detail::in_place_index_tag<K> /*unused*/ = detail::in_place_index_tag<K>() )
-{
- return in_place_t();
-}
-
-// mimic templated typedef:
-
-#define nonstd_lite_in_place_t( T) nonstd::in_place_t(&)( nonstd::detail::in_place_type_tag<T> )
-#define nonstd_lite_in_place_type_t( T) nonstd::in_place_t(&)( nonstd::detail::in_place_type_tag<T> )
-#define nonstd_lite_in_place_index_t(K) nonstd::in_place_t(&)( nonstd::detail::in_place_index_tag<K> )
-
-#define nonstd_lite_in_place( T) nonstd::in_place_type<T>
-#define nonstd_lite_in_place_type( T) nonstd::in_place_type<T>
-#define nonstd_lite_in_place_index(K) nonstd::in_place_index<K>
-
-} // namespace nonstd
-
-#endif // optional_CPP17_OR_GREATER
-#endif // nonstd_lite_HAVE_IN_PLACE_TYPES
-
-//
-// Using std::optional:
-//
-
-#if optional_USES_STD_OPTIONAL
-
-#include <optional>
-
-namespace nonstd {
-
- using std::optional;
- using std::bad_optional_access;
- using std::hash;
-
- using std::nullopt;
- using std::nullopt_t;
-
- using std::operator==;
- using std::operator!=;
- using std::operator<;
- using std::operator<=;
- using std::operator>;
- using std::operator>=;
- using std::make_optional;
- using std::swap;
-}
-
-#else // optional_USES_STD_OPTIONAL
-
-#include <cassert>
-#include <utility>
-
-// optional-lite alignment configuration:
-
-#ifndef optional_CONFIG_MAX_ALIGN_HACK
-# define optional_CONFIG_MAX_ALIGN_HACK 0
-#endif
-
-#ifndef optional_CONFIG_ALIGN_AS
-// no default, used in #if defined()
-#endif
-
-#ifndef optional_CONFIG_ALIGN_AS_FALLBACK
-# define optional_CONFIG_ALIGN_AS_FALLBACK double
-#endif
-
-// Compiler warning suppression:
-
-#if defined(__clang__)
-# pragma clang diagnostic push
-# pragma clang diagnostic ignored "-Wundef"
-#elif defined(__GNUC__)
-# pragma GCC diagnostic push
-# pragma GCC diagnostic ignored "-Wundef"
-#elif defined(_MSC_VER )
-# pragma warning( push )
-#endif
-
-// half-open range [lo..hi):
-#define optional_BETWEEN( v, lo, hi ) ( (lo) <= (v) && (v) < (hi) )
-
-// Compiler versions:
-//
-// MSVC++ 6.0 _MSC_VER == 1200 optional_COMPILER_MSVC_VERSION == 60 (Visual Studio 6.0)
-// MSVC++ 7.0 _MSC_VER == 1300 optional_COMPILER_MSVC_VERSION == 70 (Visual Studio .NET 2002)
-// MSVC++ 7.1 _MSC_VER == 1310 optional_COMPILER_MSVC_VERSION == 71 (Visual Studio .NET 2003)
-// MSVC++ 8.0 _MSC_VER == 1400 optional_COMPILER_MSVC_VERSION == 80 (Visual Studio 2005)
-// MSVC++ 9.0 _MSC_VER == 1500 optional_COMPILER_MSVC_VERSION == 90 (Visual Studio 2008)
-// MSVC++ 10.0 _MSC_VER == 1600 optional_COMPILER_MSVC_VERSION == 100 (Visual Studio 2010)
-// MSVC++ 11.0 _MSC_VER == 1700 optional_COMPILER_MSVC_VERSION == 110 (Visual Studio 2012)
-// MSVC++ 12.0 _MSC_VER == 1800 optional_COMPILER_MSVC_VERSION == 120 (Visual Studio 2013)
-// MSVC++ 14.0 _MSC_VER == 1900 optional_COMPILER_MSVC_VERSION == 140 (Visual Studio 2015)
-// MSVC++ 14.1 _MSC_VER >= 1910 optional_COMPILER_MSVC_VERSION == 141 (Visual Studio 2017)
-// MSVC++ 14.2 _MSC_VER >= 1920 optional_COMPILER_MSVC_VERSION == 142 (Visual Studio 2019)
-
-#if defined(_MSC_VER ) && !defined(__clang__)
-# define optional_COMPILER_MSVC_VER (_MSC_VER )
-# define optional_COMPILER_MSVC_VERSION (_MSC_VER / 10 - 10 * ( 5 + (_MSC_VER < 1900 ) ) )
-#else
-# define optional_COMPILER_MSVC_VER 0
-# define optional_COMPILER_MSVC_VERSION 0
-#endif
-
-#define optional_COMPILER_VERSION( major, minor, patch ) ( 10 * (10 * (major) + (minor) ) + (patch) )
-
-#if defined(__GNUC__) && !defined(__clang__)
-# define optional_COMPILER_GNUC_VERSION optional_COMPILER_VERSION(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__)
-#else
-# define optional_COMPILER_GNUC_VERSION 0
-#endif
-
-#if defined(__clang__)
-# define optional_COMPILER_CLANG_VERSION optional_COMPILER_VERSION(__clang_major__, __clang_minor__, __clang_patchlevel__)
-#else
-# define optional_COMPILER_CLANG_VERSION 0
-#endif
-
-#if optional_BETWEEN(optional_COMPILER_MSVC_VERSION, 70, 140 )
-# pragma warning( disable: 4345 ) // initialization behavior changed
-#endif
-
-#if optional_BETWEEN(optional_COMPILER_MSVC_VERSION, 70, 150 )
-# pragma warning( disable: 4814 ) // in C++14 'constexpr' will not imply 'const'
-#endif
-
-// Presence of language and library features:
-
-#define optional_HAVE(FEATURE) ( optional_HAVE_##FEATURE )
-
-#ifdef _HAS_CPP0X
-# define optional_HAS_CPP0X _HAS_CPP0X
-#else
-# define optional_HAS_CPP0X 0
-#endif
-
-// Unless defined otherwise below, consider VC14 as C++11 for optional-lite:
-
-#if optional_COMPILER_MSVC_VER >= 1900
-# undef optional_CPP11_OR_GREATER
-# define optional_CPP11_OR_GREATER 1
-#endif
-
-#define optional_CPP11_90 (optional_CPP11_OR_GREATER_ || optional_COMPILER_MSVC_VER >= 1500)
-#define optional_CPP11_100 (optional_CPP11_OR_GREATER_ || optional_COMPILER_MSVC_VER >= 1600)
-#define optional_CPP11_110 (optional_CPP11_OR_GREATER_ || optional_COMPILER_MSVC_VER >= 1700)
-#define optional_CPP11_120 (optional_CPP11_OR_GREATER_ || optional_COMPILER_MSVC_VER >= 1800)
-#define optional_CPP11_140 (optional_CPP11_OR_GREATER_ || optional_COMPILER_MSVC_VER >= 1900)
-#define optional_CPP11_141 (optional_CPP11_OR_GREATER_ || optional_COMPILER_MSVC_VER >= 1910)
-
-#define optional_CPP14_000 (optional_CPP14_OR_GREATER)
-#define optional_CPP17_000 (optional_CPP17_OR_GREATER)
-
-// clang >= 2.9, gcc >= 4.9, msvc >= vc14.0/1900 (vs15):
-#define optional_CPP11_140_C290_G490 ((optional_CPP11_OR_GREATER_ && (optional_COMPILER_CLANG_VERSION >= 290 || optional_COMPILER_GNUC_VERSION >= 490)) || (optional_COMPILER_MSVC_VER >= 1900))
-
-// clang >= 3.5, msvc >= vc11 (vs12):
-#define optional_CPP11_110_C350 ( optional_CPP11_110 && !optional_BETWEEN( optional_COMPILER_CLANG_VERSION, 1, 350 ) )
-
-// clang >= 3.5, gcc >= 5.0, msvc >= vc11 (vs12):
-#define optional_CPP11_110_C350_G500 \
- ( optional_CPP11_110 && \
- !( optional_BETWEEN( optional_COMPILER_CLANG_VERSION, 1, 350 ) \
- || optional_BETWEEN( optional_COMPILER_GNUC_VERSION , 1, 500 ) ) )
-
-// Presence of C++11 language features:
-
-#define optional_HAVE_CONSTEXPR_11 optional_CPP11_140
-#define optional_HAVE_IS_DEFAULT optional_CPP11_140
-#define optional_HAVE_NOEXCEPT optional_CPP11_140
-#define optional_HAVE_NULLPTR optional_CPP11_100
-#define optional_HAVE_REF_QUALIFIER optional_CPP11_140_C290_G490
-#define optional_HAVE_STATIC_ASSERT optional_CPP11_110
-#define optional_HAVE_INITIALIZER_LIST optional_CPP11_140
-
-// Presence of C++14 language features:
-
-#define optional_HAVE_CONSTEXPR_14 optional_CPP14_000
-
-// Presence of C++17 language features:
-
-#define optional_HAVE_NODISCARD optional_CPP17_000
-
-// Presence of C++ library features:
-
-#define optional_HAVE_CONDITIONAL optional_CPP11_120
-#define optional_HAVE_REMOVE_CV optional_CPP11_120
-#define optional_HAVE_TYPE_TRAITS optional_CPP11_90
-
-#define optional_HAVE_TR1_TYPE_TRAITS (!! optional_COMPILER_GNUC_VERSION )
-#define optional_HAVE_TR1_ADD_POINTER (!! optional_COMPILER_GNUC_VERSION )
-
-#define optional_HAVE_IS_ASSIGNABLE optional_CPP11_110_C350
-#define optional_HAVE_IS_MOVE_CONSTRUCTIBLE optional_CPP11_110_C350
-#define optional_HAVE_IS_NOTHROW_MOVE_ASSIGNABLE optional_CPP11_110_C350
-#define optional_HAVE_IS_NOTHROW_MOVE_CONSTRUCTIBLE optional_CPP11_110_C350
-#define optional_HAVE_IS_TRIVIALLY_COPY_CONSTRUCTIBLE optional_CPP11_110_C350_G500
-#define optional_HAVE_IS_TRIVIALLY_MOVE_CONSTRUCTIBLE optional_CPP11_110_C350_G500
-
-// C++ feature usage:
-
-#if optional_HAVE( CONSTEXPR_11 )
-# define optional_constexpr constexpr
-#else
-# define optional_constexpr /*constexpr*/
-#endif
-
-#if optional_HAVE( IS_DEFAULT )
-# define optional_is_default = default;
-#else
-# define optional_is_default {}
-#endif
-
-#if optional_HAVE( CONSTEXPR_14 )
-# define optional_constexpr14 constexpr
-#else
-# define optional_constexpr14 /*constexpr*/
-#endif
-
-#if optional_HAVE( NODISCARD )
-# define optional_nodiscard [[nodiscard]]
-#else
-# define optional_nodiscard /*[[nodiscard]]*/
-#endif
-
-#if optional_HAVE( NOEXCEPT )
-# define optional_noexcept noexcept
-#else
-# define optional_noexcept /*noexcept*/
-#endif
-
-#if optional_HAVE( NULLPTR )
-# define optional_nullptr nullptr
-#else
-# define optional_nullptr NULL
-#endif
-
-#if optional_HAVE( REF_QUALIFIER )
-// NOLINTNEXTLINE( bugprone-macro-parentheses )
-# define optional_ref_qual &
-# define optional_refref_qual &&
-#else
-# define optional_ref_qual /*&*/
-# define optional_refref_qual /*&&*/
-#endif
-
-#if optional_HAVE( STATIC_ASSERT )
-# define optional_static_assert(expr, text) static_assert(expr, text);
-#else
-# define optional_static_assert(expr, text) /*static_assert(expr, text);*/
-#endif
-
-// additional includes:
-
-#if optional_CONFIG_NO_EXCEPTIONS
-// already included: <cassert>
-#else
-# include <stdexcept>
-#endif
-
-#if optional_CPP11_OR_GREATER
-# include <functional>
-#endif
-
-#if optional_HAVE( INITIALIZER_LIST )
-# include <initializer_list>
-#endif
-
-#if optional_HAVE( TYPE_TRAITS )
-# include <type_traits>
-#elif optional_HAVE( TR1_TYPE_TRAITS )
-# include <tr1/type_traits>
-#endif
-
-// Method enabling
-
-#if optional_CPP11_OR_GREATER
-
-#define optional_REQUIRES_0(...) \
- template< bool B = (__VA_ARGS__), typename std::enable_if<B, int>::type = 0 >
-
-#define optional_REQUIRES_T(...) \
- , typename std::enable_if< (__VA_ARGS__), int >::type = 0
-
-#define optional_REQUIRES_R(R, ...) \
- typename std::enable_if< (__VA_ARGS__), R>::type
-
-#define optional_REQUIRES_A(...) \
- , typename std::enable_if< (__VA_ARGS__), void*>::type = nullptr
-
-#endif
-
-//
-// optional:
-//
-
-namespace nonstd { namespace optional_lite {
-
-namespace std11 {
-
-template< class T, T v > struct integral_constant { enum { value = v }; };
-template< bool B > struct bool_constant : integral_constant<bool, B>{};
-
-typedef bool_constant< true > true_type;
-typedef bool_constant< false > false_type;
-
-#if optional_CPP11_OR_GREATER
- using std::move;
-#else
- template< typename T > T & move( T & t ) { return t; }
-#endif
-
-#if optional_HAVE( CONDITIONAL )
- using std::conditional;
-#else
- template< bool B, typename T, typename F > struct conditional { typedef T type; };
- template< typename T, typename F > struct conditional<false, T, F> { typedef F type; };
-#endif // optional_HAVE_CONDITIONAL
-
-#if optional_HAVE( IS_ASSIGNABLE )
- using std::is_assignable;
-#else
- template< class T, class U > struct is_assignable : std11::true_type{};
-#endif
-
-#if optional_HAVE( IS_MOVE_CONSTRUCTIBLE )
- using std::is_move_constructible;
-#else
- template< class T > struct is_move_constructible : std11::true_type{};
-#endif
-
-#if optional_HAVE( IS_NOTHROW_MOVE_ASSIGNABLE )
- using std::is_nothrow_move_assignable;
-#else
- template< class T > struct is_nothrow_move_assignable : std11::true_type{};
-#endif
-
-#if optional_HAVE( IS_NOTHROW_MOVE_CONSTRUCTIBLE )
- using std::is_nothrow_move_constructible;
-#else
- template< class T > struct is_nothrow_move_constructible : std11::true_type{};
-#endif
-
-#if optional_HAVE( IS_TRIVIALLY_COPY_CONSTRUCTIBLE )
- using std::is_trivially_copy_constructible;
-#else
- template< class T > struct is_trivially_copy_constructible : std11::true_type{};
-#endif
-
-#if optional_HAVE( IS_TRIVIALLY_MOVE_CONSTRUCTIBLE )
- using std::is_trivially_move_constructible;
-#else
- template< class T > struct is_trivially_move_constructible : std11::true_type{};
-#endif
-
-} // namespace std11
-
-#if optional_CPP11_OR_GREATER
-
-/// type traits C++17:
-
-namespace std17 {
-
-#if optional_CPP17_OR_GREATER
-
-using std::is_swappable;
-using std::is_nothrow_swappable;
-
-#elif optional_CPP11_OR_GREATER
-
-namespace detail {
-
-using std::swap;
-
-struct is_swappable
-{
- template< typename T, typename = decltype( swap( std::declval<T&>(), std::declval<T&>() ) ) >
- static std11::true_type test( int /*unused*/ );
-
- template< typename >
- static std11::false_type test(...);
-};
-
-struct is_nothrow_swappable
-{
- // wrap noexcept(expr) in separate function as work-around for VC140 (VS2015):
-
- template< typename T >
- static constexpr bool satisfies()
- {
- return noexcept( swap( std::declval<T&>(), std::declval<T&>() ) );
- }
-
- template< typename T >
- static auto test( int /*unused*/ ) -> std11::integral_constant<bool, satisfies<T>()>{}
-
- template< typename >
- static auto test(...) -> std11::false_type;
-};
-
-} // namespace detail
-
-// is [nothow] swappable:
-
-template< typename T >
-struct is_swappable : decltype( detail::is_swappable::test<T>(0) ){};
-
-template< typename T >
-struct is_nothrow_swappable : decltype( detail::is_nothrow_swappable::test<T>(0) ){};
-
-#endif // optional_CPP17_OR_GREATER
-
-} // namespace std17
-
-/// type traits C++20:
-
-namespace std20 {
-
-template< typename T >
-struct remove_cvref
-{
- typedef typename std::remove_cv< typename std::remove_reference<T>::type >::type type;
-};
-
-} // namespace std20
-
-#endif // optional_CPP11_OR_GREATER
-
-/// class optional
-
-template< typename T >
-class optional;
-
-namespace detail {
-
-// C++11 emulation:
-
-struct nulltype{};
-
-template< typename Head, typename Tail >
-struct typelist
-{
- typedef Head head;
- typedef Tail tail;
-};
-
-#if optional_CONFIG_MAX_ALIGN_HACK
-
-// Max align, use most restricted type for alignment:
-
-#define optional_UNIQUE( name ) optional_UNIQUE2( name, __LINE__ )
-#define optional_UNIQUE2( name, line ) optional_UNIQUE3( name, line )
-#define optional_UNIQUE3( name, line ) name ## line
-
-#define optional_ALIGN_TYPE( type ) \
- type optional_UNIQUE( _t ); struct_t< type > optional_UNIQUE( _st )
-
-template< typename T >
-struct struct_t { T _; };
-
-union max_align_t
-{
- optional_ALIGN_TYPE( char );
- optional_ALIGN_TYPE( short int );
- optional_ALIGN_TYPE( int );
- optional_ALIGN_TYPE( long int );
- optional_ALIGN_TYPE( float );
- optional_ALIGN_TYPE( double );
- optional_ALIGN_TYPE( long double );
- optional_ALIGN_TYPE( char * );
- optional_ALIGN_TYPE( short int * );
- optional_ALIGN_TYPE( int * );
- optional_ALIGN_TYPE( long int * );
- optional_ALIGN_TYPE( float * );
- optional_ALIGN_TYPE( double * );
- optional_ALIGN_TYPE( long double * );
- optional_ALIGN_TYPE( void * );
-
-#ifdef HAVE_LONG_LONG
- optional_ALIGN_TYPE( long long );
-#endif
-
- struct Unknown;
-
- Unknown ( * optional_UNIQUE(_) )( Unknown );
- Unknown * Unknown::* optional_UNIQUE(_);
- Unknown ( Unknown::* optional_UNIQUE(_) )( Unknown );
-
- struct_t< Unknown ( * )( Unknown) > optional_UNIQUE(_);
- struct_t< Unknown * Unknown::* > optional_UNIQUE(_);
- struct_t< Unknown ( Unknown::* )(Unknown) > optional_UNIQUE(_);
-};
-
-#undef optional_UNIQUE
-#undef optional_UNIQUE2
-#undef optional_UNIQUE3
-
-#undef optional_ALIGN_TYPE
-
-#elif defined( optional_CONFIG_ALIGN_AS ) // optional_CONFIG_MAX_ALIGN_HACK
-
-// Use user-specified type for alignment:
-
-#define optional_ALIGN_AS( unused ) \
- optional_CONFIG_ALIGN_AS
-
-#else // optional_CONFIG_MAX_ALIGN_HACK
-
-// Determine POD type to use for alignment:
-
-#define optional_ALIGN_AS( to_align ) \
- typename type_of_size< alignment_types, alignment_of< to_align >::value >::type
-
-template< typename T >
-struct alignment_of;
-
-template< typename T >
-struct alignment_of_hack
-{
- char c;
- T t;
- alignment_of_hack();
-};
-
-template< size_t A, size_t S >
-struct alignment_logic
-{
- enum { value = A < S ? A : S };
-};
-
-template< typename T >
-struct alignment_of
-{
- enum { value = alignment_logic<
- sizeof( alignment_of_hack<T> ) - sizeof(T), sizeof(T) >::value };
-};
-
-template< typename List, size_t N >
-struct type_of_size
-{
- typedef typename std11::conditional<
- N == sizeof( typename List::head ),
- typename List::head,
- typename type_of_size<typename List::tail, N >::type >::type type;
-};
-
-template< size_t N >
-struct type_of_size< nulltype, N >
-{
- typedef optional_CONFIG_ALIGN_AS_FALLBACK type;
-};
-
-template< typename T>
-struct struct_t { T _; };
-
-#define optional_ALIGN_TYPE( type ) \
- typelist< type , typelist< struct_t< type >
-
-struct Unknown;
-
-typedef
- optional_ALIGN_TYPE( char ),
- optional_ALIGN_TYPE( short ),
- optional_ALIGN_TYPE( int ),
- optional_ALIGN_TYPE( long ),
- optional_ALIGN_TYPE( float ),
- optional_ALIGN_TYPE( double ),
- optional_ALIGN_TYPE( long double ),
-
- optional_ALIGN_TYPE( char *),
- optional_ALIGN_TYPE( short * ),
- optional_ALIGN_TYPE( int * ),
- optional_ALIGN_TYPE( long * ),
- optional_ALIGN_TYPE( float * ),
- optional_ALIGN_TYPE( double * ),
- optional_ALIGN_TYPE( long double * ),
-
- optional_ALIGN_TYPE( Unknown ( * )( Unknown ) ),
- optional_ALIGN_TYPE( Unknown * Unknown::* ),
- optional_ALIGN_TYPE( Unknown ( Unknown::* )( Unknown ) ),
-
- nulltype
- > > > > > > > > > > > > > >
- > > > > > > > > > > > > > >
- > > > > > >
- alignment_types;
-
-#undef optional_ALIGN_TYPE
-
-#endif // optional_CONFIG_MAX_ALIGN_HACK
-
-/// C++03 constructed union to hold value.
-
-template< typename T >
-union storage_t
-{
-//private:
-// template< typename > friend class optional;
-
- typedef T value_type;
-
- storage_t() optional_is_default
-
- explicit storage_t( value_type const & v )
- {
- construct_value( v );
- }
-
- void construct_value( value_type const & v )
- {
- ::new( value_ptr() ) value_type( v );
- }
-
-#if optional_CPP11_OR_GREATER
-
- explicit storage_t( value_type && v )
- {
- construct_value( std::move( v ) );
- }
-
- void construct_value( value_type && v )
- {
- ::new( value_ptr() ) value_type( std::move( v ) );
- }
-
- template< class... Args >
- storage_t( nonstd_lite_in_place_t(T), Args&&... args )
- {
- emplace( std::forward<Args>(args)... );
- }
-
- template< class... Args >
- void emplace( Args&&... args )
- {
- ::new( value_ptr() ) value_type( std::forward<Args>(args)... );
- }
-
- template< class U, class... Args >
- void emplace( std::initializer_list<U> il, Args&&... args )
- {
- ::new( value_ptr() ) value_type( il, std::forward<Args>(args)... );
- }
-
-#endif
-
- void destruct_value()
- {
- value_ptr()->~T();
- }
-
- optional_nodiscard value_type const * value_ptr() const
- {
- return as<value_type>();
- }
-
- value_type * value_ptr()
- {
- return as<value_type>();
- }
-
- optional_nodiscard value_type const & value() const optional_ref_qual
- {
- return * value_ptr();
- }
-
- value_type & value() optional_ref_qual
- {
- return * value_ptr();
- }
-
-#if optional_HAVE( REF_QUALIFIER )
-
- optional_nodiscard value_type const && value() const optional_refref_qual
- {
- return std::move( value() );
- }
-
- value_type && value() optional_refref_qual
- {
- return std::move( value() );
- }
-
-#endif
-
-#if optional_CPP11_OR_GREATER
-
- using aligned_storage_t = typename std::aligned_storage< sizeof(value_type), alignof(value_type) >::type;
- aligned_storage_t data;
-
-#elif optional_CONFIG_MAX_ALIGN_HACK
-
- typedef struct { unsigned char data[ sizeof(value_type) ]; } aligned_storage_t;
-
- max_align_t hack;
- aligned_storage_t data;
-
-#else
- typedef optional_ALIGN_AS(value_type) align_as_type;
-
- typedef struct { align_as_type data[ 1 + ( sizeof(value_type) - 1 ) / sizeof(align_as_type) ]; } aligned_storage_t;
- aligned_storage_t data;
-
-# undef optional_ALIGN_AS
-
-#endif // optional_CONFIG_MAX_ALIGN_HACK
-
- optional_nodiscard void * ptr() optional_noexcept
- {
- return &data;
- }
-
- optional_nodiscard void const * ptr() const optional_noexcept
- {
- return &data;
- }
-
- template <typename U>
- optional_nodiscard U * as()
- {
- return reinterpret_cast<U*>( ptr() );
- }
-
- template <typename U>
- optional_nodiscard U const * as() const
- {
- return reinterpret_cast<U const *>( ptr() );
- }
-};
-
-} // namespace detail
-
-/// disengaged state tag
-
-struct nullopt_t
-{
- struct init{};
- explicit optional_constexpr nullopt_t( init /*unused*/ ) optional_noexcept {}
-};
-
-#if optional_HAVE( CONSTEXPR_11 )
-constexpr nullopt_t nullopt{ nullopt_t::init{} };
-#else
-// extra parenthesis to prevent the most vexing parse:
-const nullopt_t nullopt(( nullopt_t::init() ));
-#endif
-
-/// optional access error
-
-#if ! optional_CONFIG_NO_EXCEPTIONS
-
-class bad_optional_access : public std::logic_error
-{
-public:
- explicit bad_optional_access()
- : logic_error( "bad optional access" ) {}
-};
-
-#endif //optional_CONFIG_NO_EXCEPTIONS
-
-/// optional
-
-template< typename T>
-class optional
-{
- optional_static_assert(( !std::is_same<typename std::remove_cv<T>::type, nullopt_t>::value ),
- "T in optional<T> must not be of type 'nullopt_t'.")
-
- optional_static_assert(( !std::is_same<typename std::remove_cv<T>::type, in_place_t>::value ),
- "T in optional<T> must not be of type 'in_place_t'.")
-
- optional_static_assert(( std::is_object<T>::value && std::is_destructible<T>::value && !std::is_array<T>::value ),
- "T in optional<T> must meet the Cpp17Destructible requirements.")
-
-private:
- template< typename > friend class optional;
-
- typedef void (optional::*safe_bool)() const;
-
-public:
- typedef T value_type;
-
- // x.x.3.1, constructors
-
- // 1a - default construct
- optional_constexpr optional() optional_noexcept
- : has_value_( false )
- , contained()
- {}
-
- // 1b - construct explicitly empty
- // NOLINTNEXTLINE( google-explicit-constructor, hicpp-explicit-conversions )
- optional_constexpr optional( nullopt_t /*unused*/ ) optional_noexcept
- : has_value_( false )
- , contained()
- {}
-
- // 2 - copy-construct
-#if optional_CPP11_OR_GREATER
- // template< typename U = T
- // optional_REQUIRES_T(
- // std::is_copy_constructible<U>::value
- // || std11::is_trivially_copy_constructible<U>::value
- // )
- // >
-#endif
- optional_constexpr14 optional( optional const & other )
- : has_value_( other.has_value() )
- {
- if ( other.has_value() )
- {
- contained.construct_value( other.contained.value() );
- }
- }
-
-#if optional_CPP11_OR_GREATER
-
- // 3 (C++11) - move-construct from optional
- template< typename U = T
- optional_REQUIRES_T(
- std11::is_move_constructible<U>::value
- || std11::is_trivially_move_constructible<U>::value
- )
- >
- optional_constexpr14 optional( optional && other )
- // NOLINTNEXTLINE( performance-noexcept-move-constructor )
- noexcept( std11::is_nothrow_move_constructible<T>::value )
- : has_value_( other.has_value() )
- {
- if ( other.has_value() )
- {
- contained.construct_value( std::move( other.contained.value() ) );
- }
- }
-
- // 4a (C++11) - explicit converting copy-construct from optional
- template< typename U
- optional_REQUIRES_T(
- std::is_constructible<T, U const &>::value
- && !std::is_constructible<T, optional<U> & >::value
- && !std::is_constructible<T, optional<U> && >::value
- && !std::is_constructible<T, optional<U> const & >::value
- && !std::is_constructible<T, optional<U> const && >::value
- && !std::is_convertible< optional<U> & , T>::value
- && !std::is_convertible< optional<U> && , T>::value
- && !std::is_convertible< optional<U> const & , T>::value
- && !std::is_convertible< optional<U> const &&, T>::value
- && !std::is_convertible< U const & , T>::value /*=> explicit */
- )
- >
- explicit optional( optional<U> const & other )
- : has_value_( other.has_value() )
- {
- if ( other.has_value() )
- {
- contained.construct_value( T{ other.contained.value() } );
- }
- }
-#endif // optional_CPP11_OR_GREATER
-
- // 4b (C++98 and later) - non-explicit converting copy-construct from optional
- template< typename U
-#if optional_CPP11_OR_GREATER
- optional_REQUIRES_T(
- std::is_constructible<T, U const &>::value
- && !std::is_constructible<T, optional<U> & >::value
- && !std::is_constructible<T, optional<U> && >::value
- && !std::is_constructible<T, optional<U> const & >::value
- && !std::is_constructible<T, optional<U> const && >::value
- && !std::is_convertible< optional<U> & , T>::value
- && !std::is_convertible< optional<U> && , T>::value
- && !std::is_convertible< optional<U> const & , T>::value
- && !std::is_convertible< optional<U> const &&, T>::value
- && std::is_convertible< U const & , T>::value /*=> non-explicit */
- )
-#endif // optional_CPP11_OR_GREATER
- >
- // NOLINTNEXTLINE( google-explicit-constructor, hicpp-explicit-conversions )
- /*non-explicit*/ optional( optional<U> const & other )
- : has_value_( other.has_value() )
- {
- if ( other.has_value() )
- {
- contained.construct_value( other.contained.value() );
- }
- }
-
-#if optional_CPP11_OR_GREATER
-
- // 5a (C++11) - explicit converting move-construct from optional
- template< typename U
- optional_REQUIRES_T(
- std::is_constructible<T, U &&>::value
- && !std::is_constructible<T, optional<U> & >::value
- && !std::is_constructible<T, optional<U> && >::value
- && !std::is_constructible<T, optional<U> const & >::value
- && !std::is_constructible<T, optional<U> const && >::value
- && !std::is_convertible< optional<U> & , T>::value
- && !std::is_convertible< optional<U> && , T>::value
- && !std::is_convertible< optional<U> const & , T>::value
- && !std::is_convertible< optional<U> const &&, T>::value
- && !std::is_convertible< U &&, T>::value /*=> explicit */
- )
- >
- explicit optional( optional<U> && other
- )
- : has_value_( other.has_value() )
- {
- if ( other.has_value() )
- {
- contained.construct_value( T{ std::move( other.contained.value() ) } );
- }
- }
-
- // 5a (C++11) - non-explicit converting move-construct from optional
- template< typename U
- optional_REQUIRES_T(
- std::is_constructible<T, U &&>::value
- && !std::is_constructible<T, optional<U> & >::value
- && !std::is_constructible<T, optional<U> && >::value
- && !std::is_constructible<T, optional<U> const & >::value
- && !std::is_constructible<T, optional<U> const && >::value
- && !std::is_convertible< optional<U> & , T>::value
- && !std::is_convertible< optional<U> && , T>::value
- && !std::is_convertible< optional<U> const & , T>::value
- && !std::is_convertible< optional<U> const &&, T>::value
- && std::is_convertible< U &&, T>::value /*=> non-explicit */
- )
- >
- // NOLINTNEXTLINE( google-explicit-constructor, hicpp-explicit-conversions )
- /*non-explicit*/ optional( optional<U> && other )
- : has_value_( other.has_value() )
- {
- if ( other.has_value() )
- {
- contained.construct_value( std::move( other.contained.value() ) );
- }
- }
-
- // 6 (C++11) - in-place construct
- template< typename... Args
- optional_REQUIRES_T(
- std::is_constructible<T, Args&&...>::value
- )
- >
- optional_constexpr explicit optional( nonstd_lite_in_place_t(T), Args&&... args )
- : has_value_( true )
- , contained( in_place, std::forward<Args>(args)... )
- {}
-
- // 7 (C++11) - in-place construct, initializer-list
- template< typename U, typename... Args
- optional_REQUIRES_T(
- std::is_constructible<T, std::initializer_list<U>&, Args&&...>::value
- )
- >
- optional_constexpr explicit optional( nonstd_lite_in_place_t(T), std::initializer_list<U> il, Args&&... args )
- : has_value_( true )
- , contained( T( il, std::forward<Args>(args)...) )
- {}
-
- // 8a (C++11) - explicit move construct from value
- template< typename U = T
- optional_REQUIRES_T(
- std::is_constructible<T, U&&>::value
- && !std::is_same<typename std20::remove_cvref<U>::type, nonstd_lite_in_place_t(U)>::value
- && !std::is_same<typename std20::remove_cvref<U>::type, optional<T>>::value
- && !std::is_convertible<U&&, T>::value /*=> explicit */
- )
- >
- optional_constexpr explicit optional( U && value )
- : has_value_( true )
- , contained( nonstd_lite_in_place(T), std::forward<U>( value ) )
- {}
-
- // 8b (C++11) - non-explicit move construct from value
- template< typename U = T
- optional_REQUIRES_T(
- std::is_constructible<T, U&&>::value
- && !std::is_same<typename std20::remove_cvref<U>::type, nonstd_lite_in_place_t(U)>::value
- && !std::is_same<typename std20::remove_cvref<U>::type, optional<T>>::value
- && std::is_convertible<U&&, T>::value /*=> non-explicit */
- )
- >
- // NOLINTNEXTLINE( google-explicit-constructor, hicpp-explicit-conversions )
- optional_constexpr /*non-explicit*/ optional( U && value )
- : has_value_( true )
- , contained( nonstd_lite_in_place(T), std::forward<U>( value ) )
- {}
-
-#else // optional_CPP11_OR_GREATER
-
- // 8 (C++98)
- optional( value_type const & value )
- : has_value_( true )
- , contained( value )
- {}
-
-#endif // optional_CPP11_OR_GREATER
-
- // x.x.3.2, destructor
-
- ~optional()
- {
- if ( has_value() )
- {
- contained.destruct_value();
- }
- }
-
- // x.x.3.3, assignment
-
- // 1 (C++98and later) - assign explicitly empty
- optional & operator=( nullopt_t /*unused*/) optional_noexcept
- {
- reset();
- return *this;
- }
-
- // 2 (C++98and later) - copy-assign from optional
-#if optional_CPP11_OR_GREATER
- // NOLINTNEXTLINE( cppcoreguidelines-c-copy-assignment-signature, misc-unconventional-assign-operator )
- optional_REQUIRES_R(
- optional &,
- true
-// std::is_copy_constructible<T>::value
-// && std::is_copy_assignable<T>::value
- )
- operator=( optional const & other )
- noexcept(
- std11::is_nothrow_move_assignable<T>::value
- && std11::is_nothrow_move_constructible<T>::value
- )
-#else
- optional & operator=( optional const & other )
-#endif
- {
- if ( (has_value() == true ) && (other.has_value() == false) ) { reset(); }
- else if ( (has_value() == false) && (other.has_value() == true ) ) { initialize( *other ); }
- else if ( (has_value() == true ) && (other.has_value() == true ) ) { contained.value() = *other; }
- return *this;
- }
-
-#if optional_CPP11_OR_GREATER
-
- // 3 (C++11) - move-assign from optional
- // NOLINTNEXTLINE( cppcoreguidelines-c-copy-assignment-signature, misc-unconventional-assign-operator )
- optional_REQUIRES_R(
- optional &,
- true
-// std11::is_move_constructible<T>::value
-// && std::is_move_assignable<T>::value
- )
- operator=( optional && other ) noexcept
- {
- if ( (has_value() == true ) && (other.has_value() == false) ) { reset(); }
- else if ( (has_value() == false) && (other.has_value() == true ) ) { initialize( std::move( *other ) ); }
- else if ( (has_value() == true ) && (other.has_value() == true ) ) { contained.value() = std::move( *other ); }
- return *this;
- }
-
- // 4 (C++11) - move-assign from value
- template< typename U = T >
- // NOLINTNEXTLINE( cppcoreguidelines-c-copy-assignment-signature, misc-unconventional-assign-operator )
- optional_REQUIRES_R(
- optional &,
- std::is_constructible<T , U>::value
- && std11::is_assignable<T&, U>::value
- && !std::is_same<typename std20::remove_cvref<U>::type, nonstd_lite_in_place_t(U)>::value
- && !std::is_same<typename std20::remove_cvref<U>::type, optional<T>>::value
- && !(std::is_scalar<T>::value && std::is_same<T, typename std::decay<U>::type>::value)
- )
- operator=( U && value )
- {
- if ( has_value() )
- {
- contained.value() = std::forward<U>( value );
- }
- else
- {
- initialize( T( std::forward<U>( value ) ) );
- }
- return *this;
- }
-
-#else // optional_CPP11_OR_GREATER
-
- // 4 (C++98) - copy-assign from value
- template< typename U /*= T*/ >
- optional & operator=( U const & value )
- {
- if ( has_value() ) contained.value() = value;
- else initialize( T( value ) );
- return *this;
- }
-
-#endif // optional_CPP11_OR_GREATER
-
- // 5 (C++98 and later) - converting copy-assign from optional
- template< typename U >
-#if optional_CPP11_OR_GREATER
- // NOLINTNEXTLINE( cppcoreguidelines-c-copy-assignment-signature, misc-unconventional-assign-operator )
- optional_REQUIRES_R(
- optional&,
- std::is_constructible< T , U const &>::value
- && std11::is_assignable< T&, U const &>::value
- && !std::is_constructible<T, optional<U> & >::value
- && !std::is_constructible<T, optional<U> && >::value
- && !std::is_constructible<T, optional<U> const & >::value
- && !std::is_constructible<T, optional<U> const && >::value
- && !std::is_convertible< optional<U> & , T>::value
- && !std::is_convertible< optional<U> && , T>::value
- && !std::is_convertible< optional<U> const & , T>::value
- && !std::is_convertible< optional<U> const &&, T>::value
- && !std11::is_assignable< T&, optional<U> & >::value
- && !std11::is_assignable< T&, optional<U> && >::value
- && !std11::is_assignable< T&, optional<U> const & >::value
- && !std11::is_assignable< T&, optional<U> const && >::value
- )
-#else
- optional&
-#endif // optional_CPP11_OR_GREATER
- operator=( optional<U> const & other )
- {
- return *this = optional( other );
- }
-
-#if optional_CPP11_OR_GREATER
-
- // 6 (C++11) - converting move-assign from optional
- template< typename U >
- // NOLINTNEXTLINE( cppcoreguidelines-c-copy-assignment-signature, misc-unconventional-assign-operator )
- optional_REQUIRES_R(
- optional&,
- std::is_constructible< T , U>::value
- && std11::is_assignable< T&, U>::value
- && !std::is_constructible<T, optional<U> & >::value
- && !std::is_constructible<T, optional<U> && >::value
- && !std::is_constructible<T, optional<U> const & >::value
- && !std::is_constructible<T, optional<U> const && >::value
- && !std::is_convertible< optional<U> & , T>::value
- && !std::is_convertible< optional<U> && , T>::value
- && !std::is_convertible< optional<U> const & , T>::value
- && !std::is_convertible< optional<U> const &&, T>::value
- && !std11::is_assignable< T&, optional<U> & >::value
- && !std11::is_assignable< T&, optional<U> && >::value
- && !std11::is_assignable< T&, optional<U> const & >::value
- && !std11::is_assignable< T&, optional<U> const && >::value
- )
- operator=( optional<U> && other )
- {
- return *this = optional( std::move( other ) );
- }
-
- // 7 (C++11) - emplace
- template< typename... Args
- optional_REQUIRES_T(
- std::is_constructible<T, Args&&...>::value
- )
- >
- T& emplace( Args&&... args )
- {
- *this = nullopt;
- contained.emplace( std::forward<Args>(args)... );
- has_value_ = true;
- return contained.value();
- }
-
- // 8 (C++11) - emplace, initializer-list
- template< typename U, typename... Args
- optional_REQUIRES_T(
- std::is_constructible<T, std::initializer_list<U>&, Args&&...>::value
- )
- >
- T& emplace( std::initializer_list<U> il, Args&&... args )
- {
- *this = nullopt;
- contained.emplace( il, std::forward<Args>(args)... );
- has_value_ = true;
- return contained.value();
- }
-
-#endif // optional_CPP11_OR_GREATER
-
- // x.x.3.4, swap
-
- void swap( optional & other )
-#if optional_CPP11_OR_GREATER
- noexcept(
- std11::is_nothrow_move_constructible<T>::value
- && std17::is_nothrow_swappable<T>::value
- )
-#endif
- {
- using std::swap;
- if ( (has_value() == true ) && (other.has_value() == true ) ) { swap( **this, *other ); }
- else if ( (has_value() == false) && (other.has_value() == true ) ) { initialize( std11::move(*other) ); other.reset(); }
- else if ( (has_value() == true ) && (other.has_value() == false) ) { other.initialize( std11::move(**this) ); reset(); }
- }
-
- // x.x.3.5, observers
-
- optional_constexpr value_type const * operator ->() const
- {
- return assert( has_value() ),
- contained.value_ptr();
- }
-
- optional_constexpr14 value_type * operator ->()
- {
- return assert( has_value() ),
- contained.value_ptr();
- }
-
- optional_constexpr value_type const & operator *() const optional_ref_qual
- {
- return assert( has_value() ),
- contained.value();
- }
-
- optional_constexpr14 value_type & operator *() optional_ref_qual
- {
- return assert( has_value() ),
- contained.value();
- }
-
-#if optional_HAVE( REF_QUALIFIER )
-
- optional_constexpr value_type const && operator *() const optional_refref_qual
- {
- return std::move( **this );
- }
-
- optional_constexpr14 value_type && operator *() optional_refref_qual
- {
- return std::move( **this );
- }
-
-#endif
-
-#if optional_CPP11_OR_GREATER
- optional_constexpr explicit operator bool() const optional_noexcept
- {
- return has_value();
- }
-#else
- optional_constexpr operator safe_bool() const optional_noexcept
- {
- return has_value() ? &optional::this_type_does_not_support_comparisons : 0;
- }
-#endif
-
- // NOLINTNEXTLINE( modernize-use-nodiscard )
- /*optional_nodiscard*/ optional_constexpr bool has_value() const optional_noexcept
- {
- return has_value_;
- }
-
- // NOLINTNEXTLINE( modernize-use-nodiscard )
- /*optional_nodiscard*/ optional_constexpr14 value_type const & value() const optional_ref_qual
- {
-#if optional_CONFIG_NO_EXCEPTIONS
- assert( has_value() );
-#else
- if ( ! has_value() )
- {
- throw bad_optional_access();
- }
-#endif
- return contained.value();
- }
-
- optional_constexpr14 value_type & value() optional_ref_qual
- {
-#if optional_CONFIG_NO_EXCEPTIONS
- assert( has_value() );
-#else
- if ( ! has_value() )
- {
- throw bad_optional_access();
- }
-#endif
- return contained.value();
- }
-
-#if optional_HAVE( REF_QUALIFIER ) && ( !optional_COMPILER_GNUC_VERSION || optional_COMPILER_GNUC_VERSION >= 490 )
-
- // NOLINTNEXTLINE( modernize-use-nodiscard )
- /*optional_nodiscard*/ optional_constexpr value_type const && value() const optional_refref_qual
- {
- return std::move( value() );
- }
-
- optional_constexpr14 value_type && value() optional_refref_qual
- {
- return std::move( value() );
- }
-
-#endif
-
-#if optional_HAVE( REF_QUALIFIER )
-
- template< typename U >
- optional_constexpr value_type value_or( U && v ) const optional_ref_qual
- {
- return has_value() ? contained.value() : static_cast<T>(std::forward<U>( v ) );
- }
-
- template< typename U >
- optional_constexpr14 value_type value_or( U && v ) optional_refref_qual
- {
-#if optional_COMPILER_CLANG_VERSION
- return has_value() ? /*std::move*/( contained.value() ) : static_cast<T>(std::forward<U>( v ) );
-#else
- return has_value() ? std::move( contained.value() ) : static_cast<T>(std::forward<U>( v ) );
-#endif
- }
-
-#else
-
- template< typename U >
- optional_constexpr value_type value_or( U const & v ) const
- {
- return has_value() ? contained.value() : static_cast<value_type>( v );
- }
-
-#endif // optional_HAVE( REF_QUALIFIER )
-
-#if !optional_CONFIG_NO_EXTENSIONS
-#if optional_HAVE( REF_QUALIFIER )
-
- template< typename F >
- optional_constexpr value_type value_or_eval( F f ) const &
- {
- return has_value() ? contained.value() : f();
- }
-
- template< typename F >
- optional_constexpr14 value_type value_or_eval( F f ) &&
- {
- if ( has_value() )
- {
- return std::move( contained.value() );
- }
- else
- {
- return f();
- }
- }
-
-#else
-
- template< typename F >
- optional_constexpr value_type value_or_eval( F f ) const
- {
- return has_value() ? contained.value() : f();
- }
-
-#endif // optional_HAVE( REF_QUALIFIER )
-#endif // !optional_CONFIG_NO_EXTENSIONS
-
- // x.x.3.6, modifiers
-
- void reset() optional_noexcept
- {
- if ( has_value() )
- {
- contained.destruct_value();
- }
-
- has_value_ = false;
- }
-
-private:
- void this_type_does_not_support_comparisons() const {}
-
- template< typename V >
- void initialize( V const & value )
- {
- assert( ! has_value() );
- contained.construct_value( value );
- has_value_ = true;
- }
-
-#if optional_CPP11_OR_GREATER
- template< typename V >
- void initialize( V && value )
- {
- assert( ! has_value() );
- contained.construct_value( std::move( value ) );
- has_value_ = true;
- }
-
-#endif
-
-private:
- bool has_value_;
- detail::storage_t< value_type > contained;
-
-};
-
-// Relational operators
-
-template< typename T, typename U >
-optional_nodiscard optional_constexpr bool operator==( optional<T> const & x, optional<U> const & y )
-{
- return bool(x) != bool(y) ? false : !bool( x ) ? true : *x == *y;
-}
-
-template< typename T, typename U >
-optional_nodiscard optional_constexpr bool operator!=( optional<T> const & x, optional<U> const & y )
-{
- return !(x == y);
-}
-
-template< typename T, typename U >
-optional_nodiscard optional_constexpr bool operator<( optional<T> const & x, optional<U> const & y )
-{
- return (!y) ? false : (!x) ? true : *x < *y;
-}
-
-template< typename T, typename U >
-optional_nodiscard optional_constexpr bool operator>( optional<T> const & x, optional<U> const & y )
-{
- return (y < x);
-}
-
-template< typename T, typename U >
-optional_nodiscard optional_constexpr bool operator<=( optional<T> const & x, optional<U> const & y )
-{
- return !(y < x);
-}
-
-template< typename T, typename U >
-optional_nodiscard optional_constexpr bool operator>=( optional<T> const & x, optional<U> const & y )
-{
- return !(x < y);
-}
-
-// Comparison with nullopt
-
-template< typename T >
-optional_nodiscard optional_constexpr bool operator==( optional<T> const & x, nullopt_t /*unused*/ ) optional_noexcept
-{
- return (!x);
-}
-
-template< typename T >
-optional_nodiscard optional_constexpr bool operator==( nullopt_t /*unused*/, optional<T> const & x ) optional_noexcept
-{
- return (!x);
-}
-
-template< typename T >
-optional_nodiscard optional_constexpr bool operator!=( optional<T> const & x, nullopt_t /*unused*/ ) optional_noexcept
-{
- return bool(x);
-}
-
-template< typename T >
-optional_nodiscard optional_constexpr bool operator!=( nullopt_t /*unused*/, optional<T> const & x ) optional_noexcept
-{
- return bool(x);
-}
-
-template< typename T >
-optional_nodiscard optional_constexpr bool operator<( optional<T> const & /*unused*/, nullopt_t /*unused*/ ) optional_noexcept
-{
- return false;
-}
-
-template< typename T >
-optional_nodiscard optional_constexpr bool operator<( nullopt_t /*unused*/, optional<T> const & x ) optional_noexcept
-{
- return bool(x);
-}
-
-template< typename T >
-optional_nodiscard optional_constexpr bool operator<=( optional<T> const & x, nullopt_t /*unused*/ ) optional_noexcept
-{
- return (!x);
-}
-
-template< typename T >
-optional_nodiscard optional_constexpr bool operator<=( nullopt_t /*unused*/, optional<T> const & /*unused*/ ) optional_noexcept
-{
- return true;
-}
-
-template< typename T >
-optional_nodiscard optional_constexpr bool operator>( optional<T> const & x, nullopt_t /*unused*/ ) optional_noexcept
-{
- return bool(x);
-}
-
-template< typename T >
-optional_nodiscard optional_constexpr bool operator>( nullopt_t /*unused*/, optional<T> const & /*unused*/ ) optional_noexcept
-{
- return false;
-}
-
-template< typename T >
-optional_nodiscard optional_constexpr bool operator>=( optional<T> const & /*unused*/, nullopt_t /*unused*/ ) optional_noexcept
-{
- return true;
-}
-
-template< typename T >
-optional_nodiscard optional_constexpr bool operator>=( nullopt_t /*unused*/, optional<T> const & x ) optional_noexcept
-{
- return (!x);
-}
-
-// Comparison with T
-
-template< typename T, typename U >
-optional_nodiscard optional_constexpr bool operator==( optional<T> const & x, U const & v )
-{
- return bool(x) ? *x == v : false;
-}
-
-template< typename T, typename U >
-optional_nodiscard optional_constexpr bool operator==( U const & v, optional<T> const & x )
-{
- return bool(x) ? v == *x : false;
-}
-
-template< typename T, typename U >
-optional_nodiscard optional_constexpr bool operator!=( optional<T> const & x, U const & v )
-{
- return bool(x) ? *x != v : true;
-}
-
-template< typename T, typename U >
-optional_nodiscard optional_constexpr bool operator!=( U const & v, optional<T> const & x )
-{
- return bool(x) ? v != *x : true;
-}
-
-template< typename T, typename U >
-optional_nodiscard optional_constexpr bool operator<( optional<T> const & x, U const & v )
-{
- return bool(x) ? *x < v : true;
-}
-
-template< typename T, typename U >
-optional_nodiscard optional_constexpr bool operator<( U const & v, optional<T> const & x )
-{
- return bool(x) ? v < *x : false;
-}
-
-template< typename T, typename U >
-optional_nodiscard optional_constexpr bool operator<=( optional<T> const & x, U const & v )
-{
- return bool(x) ? *x <= v : true;
-}
-
-template< typename T, typename U >
-optional_nodiscard optional_constexpr bool operator<=( U const & v, optional<T> const & x )
-{
- return bool(x) ? v <= *x : false;
-}
-
-template< typename T, typename U >
-optional_nodiscard optional_constexpr bool operator>( optional<T> const & x, U const & v )
-{
- return bool(x) ? *x > v : false;
-}
-
-template< typename T, typename U >
-optional_nodiscard optional_constexpr bool operator>( U const & v, optional<T> const & x )
-{
- return bool(x) ? v > *x : true;
-}
-
-template< typename T, typename U >
-optional_nodiscard optional_constexpr bool operator>=( optional<T> const & x, U const & v )
-{
- return bool(x) ? *x >= v : false;
-}
-
-template< typename T, typename U >
-optional_nodiscard optional_constexpr bool operator>=( U const & v, optional<T> const & x )
-{
- return bool(x) ? v >= *x : true;
-}
-
-// Specialized algorithms
-
-template< typename T
-#if optional_CPP11_OR_GREATER
- optional_REQUIRES_T(
- std11::is_move_constructible<T>::value
- && std17::is_swappable<T>::value )
-#endif
->
-void swap( optional<T> & x, optional<T> & y )
-#if optional_CPP11_OR_GREATER
- noexcept( noexcept( x.swap(y) ) )
-#endif
-{
- x.swap( y );
-}
-
-#if optional_CPP11_OR_GREATER
-
-template< typename T >
-optional_constexpr optional< typename std::decay<T>::type > make_optional( T && value )
-{
- return optional< typename std::decay<T>::type >( std::forward<T>( value ) );
-}
-
-template< typename T, typename...Args >
-optional_constexpr optional<T> make_optional( Args&&... args )
-{
- return optional<T>( nonstd_lite_in_place(T), std::forward<Args>(args)...);
-}
-
-template< typename T, typename U, typename... Args >
-optional_constexpr optional<T> make_optional( std::initializer_list<U> il, Args&&... args )
-{
- return optional<T>( nonstd_lite_in_place(T), il, std::forward<Args>(args)...);
-}
-
-#else
-
-template< typename T >
-optional<T> make_optional( T const & value )
-{
- return optional<T>( value );
-}
-
-#endif // optional_CPP11_OR_GREATER
-
-} // namespace optional_lite
-
-using optional_lite::optional;
-using optional_lite::nullopt_t;
-using optional_lite::nullopt;
-
-#if ! optional_CONFIG_NO_EXCEPTIONS
-using optional_lite::bad_optional_access;
-#endif
-
-using optional_lite::make_optional;
-
-} // namespace nonstd
-
-#if optional_CPP11_OR_GREATER
-
-// specialize the std::hash algorithm:
-
-namespace std {
-
-template< class T >
-struct hash< nonstd::optional<T> >
-{
-public:
- std::size_t operator()( nonstd::optional<T> const & v ) const optional_noexcept
- {
- return bool( v ) ? std::hash<T>{}( *v ) : 0;
- }
-};
-
-} //namespace std
-
-#endif // optional_CPP11_OR_GREATER
-
-#if defined(__clang__)
-# pragma clang diagnostic pop
-#elif defined(__GNUC__)
-# pragma GCC diagnostic pop
-#elif defined(_MSC_VER )
-# pragma warning( pop )
-#endif
-
-#endif // optional_USES_STD_OPTIONAL
-
-#endif // NONSTD_OPTIONAL_LITE_HPP
--- /dev/null
+//
+// Copyright (c) 2014-2021 Martin Moene
+//
+// https://github.com/martinmoene/optional-lite
+//
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#pragma once
+
+#ifndef NONSTD_OPTIONAL_LITE_HPP
+#define NONSTD_OPTIONAL_LITE_HPP
+
+#define optional_lite_MAJOR 3
+#define optional_lite_MINOR 5
+#define optional_lite_PATCH 0
+
+#define optional_lite_VERSION optional_STRINGIFY(optional_lite_MAJOR) "." optional_STRINGIFY(optional_lite_MINOR) "." optional_STRINGIFY(optional_lite_PATCH)
+
+#define optional_STRINGIFY( x ) optional_STRINGIFY_( x )
+#define optional_STRINGIFY_( x ) #x
+
+// optional-lite configuration:
+
+#define optional_OPTIONAL_DEFAULT 0
+#define optional_OPTIONAL_NONSTD 1
+#define optional_OPTIONAL_STD 2
+
+// tweak header support:
+
+#ifdef __has_include
+# if __has_include(<nonstd/optional.tweak.hpp>)
+# include <nonstd/optional.tweak.hpp>
+# endif
+#define optional_HAVE_TWEAK_HEADER 1
+#else
+#define optional_HAVE_TWEAK_HEADER 0
+//# pragma message("optional.hpp: Note: Tweak header not supported.")
+#endif
+
+// optional selection and configuration:
+
+#if !defined( optional_CONFIG_SELECT_OPTIONAL )
+# define optional_CONFIG_SELECT_OPTIONAL ( optional_HAVE_STD_OPTIONAL ? optional_OPTIONAL_STD : optional_OPTIONAL_NONSTD )
+#endif
+
+// Control presence of extensions:
+
+#ifndef optional_CONFIG_NO_EXTENSIONS
+#define optional_CONFIG_NO_EXTENSIONS 0
+#endif
+
+// Control presence of exception handling (try and auto discover):
+
+#ifndef optional_CONFIG_NO_EXCEPTIONS
+# if defined(_MSC_VER)
+# include <cstddef> // for _HAS_EXCEPTIONS
+# endif
+# if defined(__cpp_exceptions) || defined(__EXCEPTIONS) || (_HAS_EXCEPTIONS)
+# define optional_CONFIG_NO_EXCEPTIONS 0
+# else
+# define optional_CONFIG_NO_EXCEPTIONS 1
+# endif
+#endif
+
+// C++ language version detection (C++20 is speculative):
+// Note: VC14.0/1900 (VS2015) lacks too much from C++14.
+
+#ifndef optional_CPLUSPLUS
+# if defined(_MSVC_LANG ) && !defined(__clang__)
+# define optional_CPLUSPLUS (_MSC_VER == 1900 ? 201103L : _MSVC_LANG )
+# else
+# define optional_CPLUSPLUS __cplusplus
+# endif
+#endif
+
+#define optional_CPP98_OR_GREATER ( optional_CPLUSPLUS >= 199711L )
+#define optional_CPP11_OR_GREATER ( optional_CPLUSPLUS >= 201103L )
+#define optional_CPP11_OR_GREATER_ ( optional_CPLUSPLUS >= 201103L )
+#define optional_CPP14_OR_GREATER ( optional_CPLUSPLUS >= 201402L )
+#define optional_CPP17_OR_GREATER ( optional_CPLUSPLUS >= 201703L )
+#define optional_CPP20_OR_GREATER ( optional_CPLUSPLUS >= 202000L )
+
+// C++ language version (represent 98 as 3):
+
+#define optional_CPLUSPLUS_V ( optional_CPLUSPLUS / 100 - (optional_CPLUSPLUS > 200000 ? 2000 : 1994) )
+
+// Use C++17 std::optional if available and requested:
+
+#if optional_CPP17_OR_GREATER && defined(__has_include )
+# if __has_include( <optional> )
+# define optional_HAVE_STD_OPTIONAL 1
+# else
+# define optional_HAVE_STD_OPTIONAL 0
+# endif
+#else
+# define optional_HAVE_STD_OPTIONAL 0
+#endif
+
+#define optional_USES_STD_OPTIONAL ( (optional_CONFIG_SELECT_OPTIONAL == optional_OPTIONAL_STD) || ((optional_CONFIG_SELECT_OPTIONAL == optional_OPTIONAL_DEFAULT) && optional_HAVE_STD_OPTIONAL) )
+
+//
+// in_place: code duplicated in any-lite, expected-lite, optional-lite, value-ptr-lite, variant-lite:
+//
+
+#ifndef nonstd_lite_HAVE_IN_PLACE_TYPES
+#define nonstd_lite_HAVE_IN_PLACE_TYPES 1
+
+// C++17 std::in_place in <utility>:
+
+#if optional_CPP17_OR_GREATER
+
+#include <utility>
+
+namespace nonstd {
+
+using std::in_place;
+using std::in_place_type;
+using std::in_place_index;
+using std::in_place_t;
+using std::in_place_type_t;
+using std::in_place_index_t;
+
+#define nonstd_lite_in_place_t( T) std::in_place_t
+#define nonstd_lite_in_place_type_t( T) std::in_place_type_t<T>
+#define nonstd_lite_in_place_index_t(K) std::in_place_index_t<K>
+
+#define nonstd_lite_in_place( T) std::in_place_t{}
+#define nonstd_lite_in_place_type( T) std::in_place_type_t<T>{}
+#define nonstd_lite_in_place_index(K) std::in_place_index_t<K>{}
+
+} // namespace nonstd
+
+#else // optional_CPP17_OR_GREATER
+
+#include <cstddef>
+
+namespace nonstd {
+namespace detail {
+
+template< class T >
+struct in_place_type_tag {};
+
+template< std::size_t K >
+struct in_place_index_tag {};
+
+} // namespace detail
+
+struct in_place_t {};
+
+template< class T >
+inline in_place_t in_place( detail::in_place_type_tag<T> /*unused*/ = detail::in_place_type_tag<T>() )
+{
+ return in_place_t();
+}
+
+template< std::size_t K >
+inline in_place_t in_place( detail::in_place_index_tag<K> /*unused*/ = detail::in_place_index_tag<K>() )
+{
+ return in_place_t();
+}
+
+template< class T >
+inline in_place_t in_place_type( detail::in_place_type_tag<T> /*unused*/ = detail::in_place_type_tag<T>() )
+{
+ return in_place_t();
+}
+
+template< std::size_t K >
+inline in_place_t in_place_index( detail::in_place_index_tag<K> /*unused*/ = detail::in_place_index_tag<K>() )
+{
+ return in_place_t();
+}
+
+// mimic templated typedef:
+
+#define nonstd_lite_in_place_t( T) nonstd::in_place_t(&)( nonstd::detail::in_place_type_tag<T> )
+#define nonstd_lite_in_place_type_t( T) nonstd::in_place_t(&)( nonstd::detail::in_place_type_tag<T> )
+#define nonstd_lite_in_place_index_t(K) nonstd::in_place_t(&)( nonstd::detail::in_place_index_tag<K> )
+
+#define nonstd_lite_in_place( T) nonstd::in_place_type<T>
+#define nonstd_lite_in_place_type( T) nonstd::in_place_type<T>
+#define nonstd_lite_in_place_index(K) nonstd::in_place_index<K>
+
+} // namespace nonstd
+
+#endif // optional_CPP17_OR_GREATER
+#endif // nonstd_lite_HAVE_IN_PLACE_TYPES
+
+//
+// Using std::optional:
+//
+
+#if optional_USES_STD_OPTIONAL
+
+#include <optional>
+
+namespace nonstd {
+
+ using std::optional;
+ using std::bad_optional_access;
+ using std::hash;
+
+ using std::nullopt;
+ using std::nullopt_t;
+
+ using std::operator==;
+ using std::operator!=;
+ using std::operator<;
+ using std::operator<=;
+ using std::operator>;
+ using std::operator>=;
+ using std::make_optional;
+ using std::swap;
+}
+
+#else // optional_USES_STD_OPTIONAL
+
+#include <cassert>
+#include <utility>
+
+// optional-lite alignment configuration:
+
+#ifndef optional_CONFIG_MAX_ALIGN_HACK
+# define optional_CONFIG_MAX_ALIGN_HACK 0
+#endif
+
+#ifndef optional_CONFIG_ALIGN_AS
+// no default, used in #if defined()
+#endif
+
+#ifndef optional_CONFIG_ALIGN_AS_FALLBACK
+# define optional_CONFIG_ALIGN_AS_FALLBACK double
+#endif
+
+// Compiler warning suppression:
+
+#if defined(__clang__)
+# pragma clang diagnostic push
+# pragma clang diagnostic ignored "-Wundef"
+#elif defined(__GNUC__)
+# pragma GCC diagnostic push
+# pragma GCC diagnostic ignored "-Wundef"
+#elif defined(_MSC_VER )
+# pragma warning( push )
+#endif
+
+// half-open range [lo..hi):
+#define optional_BETWEEN( v, lo, hi ) ( (lo) <= (v) && (v) < (hi) )
+
+// Compiler versions:
+//
+// MSVC++ 6.0 _MSC_VER == 1200 optional_COMPILER_MSVC_VERSION == 60 (Visual Studio 6.0)
+// MSVC++ 7.0 _MSC_VER == 1300 optional_COMPILER_MSVC_VERSION == 70 (Visual Studio .NET 2002)
+// MSVC++ 7.1 _MSC_VER == 1310 optional_COMPILER_MSVC_VERSION == 71 (Visual Studio .NET 2003)
+// MSVC++ 8.0 _MSC_VER == 1400 optional_COMPILER_MSVC_VERSION == 80 (Visual Studio 2005)
+// MSVC++ 9.0 _MSC_VER == 1500 optional_COMPILER_MSVC_VERSION == 90 (Visual Studio 2008)
+// MSVC++ 10.0 _MSC_VER == 1600 optional_COMPILER_MSVC_VERSION == 100 (Visual Studio 2010)
+// MSVC++ 11.0 _MSC_VER == 1700 optional_COMPILER_MSVC_VERSION == 110 (Visual Studio 2012)
+// MSVC++ 12.0 _MSC_VER == 1800 optional_COMPILER_MSVC_VERSION == 120 (Visual Studio 2013)
+// MSVC++ 14.0 _MSC_VER == 1900 optional_COMPILER_MSVC_VERSION == 140 (Visual Studio 2015)
+// MSVC++ 14.1 _MSC_VER >= 1910 optional_COMPILER_MSVC_VERSION == 141 (Visual Studio 2017)
+// MSVC++ 14.2 _MSC_VER >= 1920 optional_COMPILER_MSVC_VERSION == 142 (Visual Studio 2019)
+
+#if defined(_MSC_VER ) && !defined(__clang__)
+# define optional_COMPILER_MSVC_VER (_MSC_VER )
+# define optional_COMPILER_MSVC_VERSION (_MSC_VER / 10 - 10 * ( 5 + (_MSC_VER < 1900 ) ) )
+#else
+# define optional_COMPILER_MSVC_VER 0
+# define optional_COMPILER_MSVC_VERSION 0
+#endif
+
+#define optional_COMPILER_VERSION( major, minor, patch ) ( 10 * (10 * (major) + (minor) ) + (patch) )
+
+#if defined(__GNUC__) && !defined(__clang__)
+# define optional_COMPILER_GNUC_VERSION optional_COMPILER_VERSION(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__)
+#else
+# define optional_COMPILER_GNUC_VERSION 0
+#endif
+
+#if defined(__clang__)
+# define optional_COMPILER_CLANG_VERSION optional_COMPILER_VERSION(__clang_major__, __clang_minor__, __clang_patchlevel__)
+#else
+# define optional_COMPILER_CLANG_VERSION 0
+#endif
+
+#if optional_BETWEEN(optional_COMPILER_MSVC_VERSION, 70, 140 )
+# pragma warning( disable: 4345 ) // initialization behavior changed
+#endif
+
+#if optional_BETWEEN(optional_COMPILER_MSVC_VERSION, 70, 150 )
+# pragma warning( disable: 4814 ) // in C++14 'constexpr' will not imply 'const'
+#endif
+
+// Presence of language and library features:
+
+#define optional_HAVE(FEATURE) ( optional_HAVE_##FEATURE )
+
+#ifdef _HAS_CPP0X
+# define optional_HAS_CPP0X _HAS_CPP0X
+#else
+# define optional_HAS_CPP0X 0
+#endif
+
+// Unless defined otherwise below, consider VC14 as C++11 for optional-lite:
+
+#if optional_COMPILER_MSVC_VER >= 1900
+# undef optional_CPP11_OR_GREATER
+# define optional_CPP11_OR_GREATER 1
+#endif
+
+#define optional_CPP11_90 (optional_CPP11_OR_GREATER_ || optional_COMPILER_MSVC_VER >= 1500)
+#define optional_CPP11_100 (optional_CPP11_OR_GREATER_ || optional_COMPILER_MSVC_VER >= 1600)
+#define optional_CPP11_110 (optional_CPP11_OR_GREATER_ || optional_COMPILER_MSVC_VER >= 1700)
+#define optional_CPP11_120 (optional_CPP11_OR_GREATER_ || optional_COMPILER_MSVC_VER >= 1800)
+#define optional_CPP11_140 (optional_CPP11_OR_GREATER_ || optional_COMPILER_MSVC_VER >= 1900)
+#define optional_CPP11_141 (optional_CPP11_OR_GREATER_ || optional_COMPILER_MSVC_VER >= 1910)
+
+#define optional_CPP14_000 (optional_CPP14_OR_GREATER)
+#define optional_CPP17_000 (optional_CPP17_OR_GREATER)
+
+// clang >= 2.9, gcc >= 4.9, msvc >= vc14.0/1900 (vs15):
+#define optional_CPP11_140_C290_G490 ((optional_CPP11_OR_GREATER_ && (optional_COMPILER_CLANG_VERSION >= 290 || optional_COMPILER_GNUC_VERSION >= 490)) || (optional_COMPILER_MSVC_VER >= 1900))
+
+// clang >= 3.5, msvc >= vc11 (vs12):
+#define optional_CPP11_110_C350 ( optional_CPP11_110 && !optional_BETWEEN( optional_COMPILER_CLANG_VERSION, 1, 350 ) )
+
+// clang >= 3.5, gcc >= 5.0, msvc >= vc11 (vs12):
+#define optional_CPP11_110_C350_G500 \
+ ( optional_CPP11_110 && \
+ !( optional_BETWEEN( optional_COMPILER_CLANG_VERSION, 1, 350 ) \
+ || optional_BETWEEN( optional_COMPILER_GNUC_VERSION , 1, 500 ) ) )
+
+// Presence of C++11 language features:
+
+#define optional_HAVE_CONSTEXPR_11 optional_CPP11_140
+#define optional_HAVE_IS_DEFAULT optional_CPP11_140
+#define optional_HAVE_NOEXCEPT optional_CPP11_140
+#define optional_HAVE_NULLPTR optional_CPP11_100
+#define optional_HAVE_REF_QUALIFIER optional_CPP11_140_C290_G490
+#define optional_HAVE_STATIC_ASSERT optional_CPP11_110
+#define optional_HAVE_INITIALIZER_LIST optional_CPP11_140
+
+// Presence of C++14 language features:
+
+#define optional_HAVE_CONSTEXPR_14 optional_CPP14_000
+
+// Presence of C++17 language features:
+
+#define optional_HAVE_NODISCARD optional_CPP17_000
+
+// Presence of C++ library features:
+
+#define optional_HAVE_CONDITIONAL optional_CPP11_120
+#define optional_HAVE_REMOVE_CV optional_CPP11_120
+#define optional_HAVE_TYPE_TRAITS optional_CPP11_90
+
+#define optional_HAVE_TR1_TYPE_TRAITS (!! optional_COMPILER_GNUC_VERSION )
+#define optional_HAVE_TR1_ADD_POINTER (!! optional_COMPILER_GNUC_VERSION )
+
+#define optional_HAVE_IS_ASSIGNABLE optional_CPP11_110_C350
+#define optional_HAVE_IS_MOVE_CONSTRUCTIBLE optional_CPP11_110_C350
+#define optional_HAVE_IS_NOTHROW_MOVE_ASSIGNABLE optional_CPP11_110_C350
+#define optional_HAVE_IS_NOTHROW_MOVE_CONSTRUCTIBLE optional_CPP11_110_C350
+#define optional_HAVE_IS_TRIVIALLY_COPY_CONSTRUCTIBLE optional_CPP11_110_C350_G500
+#define optional_HAVE_IS_TRIVIALLY_MOVE_CONSTRUCTIBLE optional_CPP11_110_C350_G500
+
+// C++ feature usage:
+
+#if optional_HAVE( CONSTEXPR_11 )
+# define optional_constexpr constexpr
+#else
+# define optional_constexpr /*constexpr*/
+#endif
+
+#if optional_HAVE( IS_DEFAULT )
+# define optional_is_default = default;
+#else
+# define optional_is_default {}
+#endif
+
+#if optional_HAVE( CONSTEXPR_14 )
+# define optional_constexpr14 constexpr
+#else
+# define optional_constexpr14 /*constexpr*/
+#endif
+
+#if optional_HAVE( NODISCARD )
+# define optional_nodiscard [[nodiscard]]
+#else
+# define optional_nodiscard /*[[nodiscard]]*/
+#endif
+
+#if optional_HAVE( NOEXCEPT )
+# define optional_noexcept noexcept
+#else
+# define optional_noexcept /*noexcept*/
+#endif
+
+#if optional_HAVE( NULLPTR )
+# define optional_nullptr nullptr
+#else
+# define optional_nullptr NULL
+#endif
+
+#if optional_HAVE( REF_QUALIFIER )
+// NOLINTNEXTLINE( bugprone-macro-parentheses )
+# define optional_ref_qual &
+# define optional_refref_qual &&
+#else
+# define optional_ref_qual /*&*/
+# define optional_refref_qual /*&&*/
+#endif
+
+#if optional_HAVE( STATIC_ASSERT )
+# define optional_static_assert(expr, text) static_assert(expr, text);
+#else
+# define optional_static_assert(expr, text) /*static_assert(expr, text);*/
+#endif
+
+// additional includes:
+
+#if optional_CONFIG_NO_EXCEPTIONS
+// already included: <cassert>
+#else
+# include <stdexcept>
+#endif
+
+#if optional_CPP11_OR_GREATER
+# include <functional>
+#endif
+
+#if optional_HAVE( INITIALIZER_LIST )
+# include <initializer_list>
+#endif
+
+#if optional_HAVE( TYPE_TRAITS )
+# include <type_traits>
+#elif optional_HAVE( TR1_TYPE_TRAITS )
+# include <tr1/type_traits>
+#endif
+
+// Method enabling
+
+#if optional_CPP11_OR_GREATER
+
+#define optional_REQUIRES_0(...) \
+ template< bool B = (__VA_ARGS__), typename std::enable_if<B, int>::type = 0 >
+
+#define optional_REQUIRES_T(...) \
+ , typename std::enable_if< (__VA_ARGS__), int >::type = 0
+
+#define optional_REQUIRES_R(R, ...) \
+ typename std::enable_if< (__VA_ARGS__), R>::type
+
+#define optional_REQUIRES_A(...) \
+ , typename std::enable_if< (__VA_ARGS__), void*>::type = nullptr
+
+#endif
+
+//
+// optional:
+//
+
+namespace nonstd { namespace optional_lite {
+
+namespace std11 {
+
+template< class T, T v > struct integral_constant { enum { value = v }; };
+template< bool B > struct bool_constant : integral_constant<bool, B>{};
+
+typedef bool_constant< true > true_type;
+typedef bool_constant< false > false_type;
+
+#if optional_CPP11_OR_GREATER
+ using std::move;
+#else
+ template< typename T > T & move( T & t ) { return t; }
+#endif
+
+#if optional_HAVE( CONDITIONAL )
+ using std::conditional;
+#else
+ template< bool B, typename T, typename F > struct conditional { typedef T type; };
+ template< typename T, typename F > struct conditional<false, T, F> { typedef F type; };
+#endif // optional_HAVE_CONDITIONAL
+
+#if optional_HAVE( IS_ASSIGNABLE )
+ using std::is_assignable;
+#else
+ template< class T, class U > struct is_assignable : std11::true_type{};
+#endif
+
+#if optional_HAVE( IS_MOVE_CONSTRUCTIBLE )
+ using std::is_move_constructible;
+#else
+ template< class T > struct is_move_constructible : std11::true_type{};
+#endif
+
+#if optional_HAVE( IS_NOTHROW_MOVE_ASSIGNABLE )
+ using std::is_nothrow_move_assignable;
+#else
+ template< class T > struct is_nothrow_move_assignable : std11::true_type{};
+#endif
+
+#if optional_HAVE( IS_NOTHROW_MOVE_CONSTRUCTIBLE )
+ using std::is_nothrow_move_constructible;
+#else
+ template< class T > struct is_nothrow_move_constructible : std11::true_type{};
+#endif
+
+#if optional_HAVE( IS_TRIVIALLY_COPY_CONSTRUCTIBLE )
+ using std::is_trivially_copy_constructible;
+#else
+ template< class T > struct is_trivially_copy_constructible : std11::true_type{};
+#endif
+
+#if optional_HAVE( IS_TRIVIALLY_MOVE_CONSTRUCTIBLE )
+ using std::is_trivially_move_constructible;
+#else
+ template< class T > struct is_trivially_move_constructible : std11::true_type{};
+#endif
+
+} // namespace std11
+
+#if optional_CPP11_OR_GREATER
+
+/// type traits C++17:
+
+namespace std17 {
+
+#if optional_CPP17_OR_GREATER
+
+using std::is_swappable;
+using std::is_nothrow_swappable;
+
+#elif optional_CPP11_OR_GREATER
+
+namespace detail {
+
+using std::swap;
+
+struct is_swappable
+{
+ template< typename T, typename = decltype( swap( std::declval<T&>(), std::declval<T&>() ) ) >
+ static std11::true_type test( int /*unused*/ );
+
+ template< typename >
+ static std11::false_type test(...);
+};
+
+struct is_nothrow_swappable
+{
+ // wrap noexcept(expr) in separate function as work-around for VC140 (VS2015):
+
+ template< typename T >
+ static constexpr bool satisfies()
+ {
+ return noexcept( swap( std::declval<T&>(), std::declval<T&>() ) );
+ }
+
+ template< typename T >
+ static auto test( int /*unused*/ ) -> std11::integral_constant<bool, satisfies<T>()>{}
+
+ template< typename >
+ static auto test(...) -> std11::false_type;
+};
+
+} // namespace detail
+
+// is [nothow] swappable:
+
+template< typename T >
+struct is_swappable : decltype( detail::is_swappable::test<T>(0) ){};
+
+template< typename T >
+struct is_nothrow_swappable : decltype( detail::is_nothrow_swappable::test<T>(0) ){};
+
+#endif // optional_CPP17_OR_GREATER
+
+} // namespace std17
+
+/// type traits C++20:
+
+namespace std20 {
+
+template< typename T >
+struct remove_cvref
+{
+ typedef typename std::remove_cv< typename std::remove_reference<T>::type >::type type;
+};
+
+} // namespace std20
+
+#endif // optional_CPP11_OR_GREATER
+
+/// class optional
+
+template< typename T >
+class optional;
+
+namespace detail {
+
+// C++11 emulation:
+
+struct nulltype{};
+
+template< typename Head, typename Tail >
+struct typelist
+{
+ typedef Head head;
+ typedef Tail tail;
+};
+
+#if optional_CONFIG_MAX_ALIGN_HACK
+
+// Max align, use most restricted type for alignment:
+
+#define optional_UNIQUE( name ) optional_UNIQUE2( name, __LINE__ )
+#define optional_UNIQUE2( name, line ) optional_UNIQUE3( name, line )
+#define optional_UNIQUE3( name, line ) name ## line
+
+#define optional_ALIGN_TYPE( type ) \
+ type optional_UNIQUE( _t ); struct_t< type > optional_UNIQUE( _st )
+
+template< typename T >
+struct struct_t { T _; };
+
+union max_align_t
+{
+ optional_ALIGN_TYPE( char );
+ optional_ALIGN_TYPE( short int );
+ optional_ALIGN_TYPE( int );
+ optional_ALIGN_TYPE( long int );
+ optional_ALIGN_TYPE( float );
+ optional_ALIGN_TYPE( double );
+ optional_ALIGN_TYPE( long double );
+ optional_ALIGN_TYPE( char * );
+ optional_ALIGN_TYPE( short int * );
+ optional_ALIGN_TYPE( int * );
+ optional_ALIGN_TYPE( long int * );
+ optional_ALIGN_TYPE( float * );
+ optional_ALIGN_TYPE( double * );
+ optional_ALIGN_TYPE( long double * );
+ optional_ALIGN_TYPE( void * );
+
+#ifdef HAVE_LONG_LONG
+ optional_ALIGN_TYPE( long long );
+#endif
+
+ struct Unknown;
+
+ Unknown ( * optional_UNIQUE(_) )( Unknown );
+ Unknown * Unknown::* optional_UNIQUE(_);
+ Unknown ( Unknown::* optional_UNIQUE(_) )( Unknown );
+
+ struct_t< Unknown ( * )( Unknown) > optional_UNIQUE(_);
+ struct_t< Unknown * Unknown::* > optional_UNIQUE(_);
+ struct_t< Unknown ( Unknown::* )(Unknown) > optional_UNIQUE(_);
+};
+
+#undef optional_UNIQUE
+#undef optional_UNIQUE2
+#undef optional_UNIQUE3
+
+#undef optional_ALIGN_TYPE
+
+#elif defined( optional_CONFIG_ALIGN_AS ) // optional_CONFIG_MAX_ALIGN_HACK
+
+// Use user-specified type for alignment:
+
+#define optional_ALIGN_AS( unused ) \
+ optional_CONFIG_ALIGN_AS
+
+#else // optional_CONFIG_MAX_ALIGN_HACK
+
+// Determine POD type to use for alignment:
+
+#define optional_ALIGN_AS( to_align ) \
+ typename type_of_size< alignment_types, alignment_of< to_align >::value >::type
+
+template< typename T >
+struct alignment_of;
+
+template< typename T >
+struct alignment_of_hack
+{
+ char c;
+ T t;
+ alignment_of_hack();
+};
+
+template< size_t A, size_t S >
+struct alignment_logic
+{
+ enum { value = A < S ? A : S };
+};
+
+template< typename T >
+struct alignment_of
+{
+ enum { value = alignment_logic<
+ sizeof( alignment_of_hack<T> ) - sizeof(T), sizeof(T) >::value };
+};
+
+template< typename List, size_t N >
+struct type_of_size
+{
+ typedef typename std11::conditional<
+ N == sizeof( typename List::head ),
+ typename List::head,
+ typename type_of_size<typename List::tail, N >::type >::type type;
+};
+
+template< size_t N >
+struct type_of_size< nulltype, N >
+{
+ typedef optional_CONFIG_ALIGN_AS_FALLBACK type;
+};
+
+template< typename T>
+struct struct_t { T _; };
+
+#define optional_ALIGN_TYPE( type ) \
+ typelist< type , typelist< struct_t< type >
+
+struct Unknown;
+
+typedef
+ optional_ALIGN_TYPE( char ),
+ optional_ALIGN_TYPE( short ),
+ optional_ALIGN_TYPE( int ),
+ optional_ALIGN_TYPE( long ),
+ optional_ALIGN_TYPE( float ),
+ optional_ALIGN_TYPE( double ),
+ optional_ALIGN_TYPE( long double ),
+
+ optional_ALIGN_TYPE( char *),
+ optional_ALIGN_TYPE( short * ),
+ optional_ALIGN_TYPE( int * ),
+ optional_ALIGN_TYPE( long * ),
+ optional_ALIGN_TYPE( float * ),
+ optional_ALIGN_TYPE( double * ),
+ optional_ALIGN_TYPE( long double * ),
+
+ optional_ALIGN_TYPE( Unknown ( * )( Unknown ) ),
+ optional_ALIGN_TYPE( Unknown * Unknown::* ),
+ optional_ALIGN_TYPE( Unknown ( Unknown::* )( Unknown ) ),
+
+ nulltype
+ > > > > > > > > > > > > > >
+ > > > > > > > > > > > > > >
+ > > > > > >
+ alignment_types;
+
+#undef optional_ALIGN_TYPE
+
+#endif // optional_CONFIG_MAX_ALIGN_HACK
+
+/// C++03 constructed union to hold value.
+
+template< typename T >
+union storage_t
+{
+//private:
+// template< typename > friend class optional;
+
+ typedef T value_type;
+
+ storage_t() optional_is_default
+
+ explicit storage_t( value_type const & v )
+ {
+ construct_value( v );
+ }
+
+ void construct_value( value_type const & v )
+ {
+ ::new( value_ptr() ) value_type( v );
+ }
+
+#if optional_CPP11_OR_GREATER
+
+ explicit storage_t( value_type && v )
+ {
+ construct_value( std::move( v ) );
+ }
+
+ void construct_value( value_type && v )
+ {
+ ::new( value_ptr() ) value_type( std::move( v ) );
+ }
+
+ template< class... Args >
+ storage_t( nonstd_lite_in_place_t(T), Args&&... args )
+ {
+ emplace( std::forward<Args>(args)... );
+ }
+
+ template< class... Args >
+ void emplace( Args&&... args )
+ {
+ ::new( value_ptr() ) value_type( std::forward<Args>(args)... );
+ }
+
+ template< class U, class... Args >
+ void emplace( std::initializer_list<U> il, Args&&... args )
+ {
+ ::new( value_ptr() ) value_type( il, std::forward<Args>(args)... );
+ }
+
+#endif
+
+ void destruct_value()
+ {
+ value_ptr()->~T();
+ }
+
+ optional_nodiscard value_type const * value_ptr() const
+ {
+ return as<value_type>();
+ }
+
+ value_type * value_ptr()
+ {
+ return as<value_type>();
+ }
+
+ optional_nodiscard value_type const & value() const optional_ref_qual
+ {
+ return * value_ptr();
+ }
+
+ value_type & value() optional_ref_qual
+ {
+ return * value_ptr();
+ }
+
+#if optional_HAVE( REF_QUALIFIER )
+
+ optional_nodiscard value_type const && value() const optional_refref_qual
+ {
+ return std::move( value() );
+ }
+
+ value_type && value() optional_refref_qual
+ {
+ return std::move( value() );
+ }
+
+#endif
+
+#if optional_CPP11_OR_GREATER
+
+ using aligned_storage_t = typename std::aligned_storage< sizeof(value_type), alignof(value_type) >::type;
+ aligned_storage_t data;
+
+#elif optional_CONFIG_MAX_ALIGN_HACK
+
+ typedef struct { unsigned char data[ sizeof(value_type) ]; } aligned_storage_t;
+
+ max_align_t hack;
+ aligned_storage_t data;
+
+#else
+ typedef optional_ALIGN_AS(value_type) align_as_type;
+
+ typedef struct { align_as_type data[ 1 + ( sizeof(value_type) - 1 ) / sizeof(align_as_type) ]; } aligned_storage_t;
+ aligned_storage_t data;
+
+# undef optional_ALIGN_AS
+
+#endif // optional_CONFIG_MAX_ALIGN_HACK
+
+ optional_nodiscard void * ptr() optional_noexcept
+ {
+ return &data;
+ }
+
+ optional_nodiscard void const * ptr() const optional_noexcept
+ {
+ return &data;
+ }
+
+ template <typename U>
+ optional_nodiscard U * as()
+ {
+ return reinterpret_cast<U*>( ptr() );
+ }
+
+ template <typename U>
+ optional_nodiscard U const * as() const
+ {
+ return reinterpret_cast<U const *>( ptr() );
+ }
+};
+
+} // namespace detail
+
+/// disengaged state tag
+
+struct nullopt_t
+{
+ struct init{};
+ explicit optional_constexpr nullopt_t( init /*unused*/ ) optional_noexcept {}
+};
+
+#if optional_HAVE( CONSTEXPR_11 )
+constexpr nullopt_t nullopt{ nullopt_t::init{} };
+#else
+// extra parenthesis to prevent the most vexing parse:
+const nullopt_t nullopt(( nullopt_t::init() ));
+#endif
+
+/// optional access error
+
+#if ! optional_CONFIG_NO_EXCEPTIONS
+
+class bad_optional_access : public std::logic_error
+{
+public:
+ explicit bad_optional_access()
+ : logic_error( "bad optional access" ) {}
+};
+
+#endif //optional_CONFIG_NO_EXCEPTIONS
+
+/// optional
+
+template< typename T>
+class optional
+{
+ optional_static_assert(( !std::is_same<typename std::remove_cv<T>::type, nullopt_t>::value ),
+ "T in optional<T> must not be of type 'nullopt_t'.")
+
+ optional_static_assert(( !std::is_same<typename std::remove_cv<T>::type, in_place_t>::value ),
+ "T in optional<T> must not be of type 'in_place_t'.")
+
+ optional_static_assert(( std::is_object<T>::value && std::is_destructible<T>::value && !std::is_array<T>::value ),
+ "T in optional<T> must meet the Cpp17Destructible requirements.")
+
+private:
+ template< typename > friend class optional;
+
+ typedef void (optional::*safe_bool)() const;
+
+public:
+ typedef T value_type;
+
+ // x.x.3.1, constructors
+
+ // 1a - default construct
+ optional_constexpr optional() optional_noexcept
+ : has_value_( false )
+ , contained()
+ {}
+
+ // 1b - construct explicitly empty
+ // NOLINTNEXTLINE( google-explicit-constructor, hicpp-explicit-conversions )
+ optional_constexpr optional( nullopt_t /*unused*/ ) optional_noexcept
+ : has_value_( false )
+ , contained()
+ {}
+
+ // 2 - copy-construct
+#if optional_CPP11_OR_GREATER
+ // template< typename U = T
+ // optional_REQUIRES_T(
+ // std::is_copy_constructible<U>::value
+ // || std11::is_trivially_copy_constructible<U>::value
+ // )
+ // >
+#endif
+ optional_constexpr14 optional( optional const & other )
+ : has_value_( other.has_value() )
+ {
+ if ( other.has_value() )
+ {
+ contained.construct_value( other.contained.value() );
+ }
+ }
+
+#if optional_CPP11_OR_GREATER
+
+ // 3 (C++11) - move-construct from optional
+ template< typename U = T
+ optional_REQUIRES_T(
+ std11::is_move_constructible<U>::value
+ || std11::is_trivially_move_constructible<U>::value
+ )
+ >
+ optional_constexpr14 optional( optional && other )
+ // NOLINTNEXTLINE( performance-noexcept-move-constructor )
+ noexcept( std11::is_nothrow_move_constructible<T>::value )
+ : has_value_( other.has_value() )
+ {
+ if ( other.has_value() )
+ {
+ contained.construct_value( std::move( other.contained.value() ) );
+ }
+ }
+
+ // 4a (C++11) - explicit converting copy-construct from optional
+ template< typename U
+ optional_REQUIRES_T(
+ std::is_constructible<T, U const &>::value
+ && !std::is_constructible<T, optional<U> & >::value
+ && !std::is_constructible<T, optional<U> && >::value
+ && !std::is_constructible<T, optional<U> const & >::value
+ && !std::is_constructible<T, optional<U> const && >::value
+ && !std::is_convertible< optional<U> & , T>::value
+ && !std::is_convertible< optional<U> && , T>::value
+ && !std::is_convertible< optional<U> const & , T>::value
+ && !std::is_convertible< optional<U> const &&, T>::value
+ && !std::is_convertible< U const & , T>::value /*=> explicit */
+ )
+ >
+ explicit optional( optional<U> const & other )
+ : has_value_( other.has_value() )
+ {
+ if ( other.has_value() )
+ {
+ contained.construct_value( T{ other.contained.value() } );
+ }
+ }
+#endif // optional_CPP11_OR_GREATER
+
+ // 4b (C++98 and later) - non-explicit converting copy-construct from optional
+ template< typename U
+#if optional_CPP11_OR_GREATER
+ optional_REQUIRES_T(
+ std::is_constructible<T, U const &>::value
+ && !std::is_constructible<T, optional<U> & >::value
+ && !std::is_constructible<T, optional<U> && >::value
+ && !std::is_constructible<T, optional<U> const & >::value
+ && !std::is_constructible<T, optional<U> const && >::value
+ && !std::is_convertible< optional<U> & , T>::value
+ && !std::is_convertible< optional<U> && , T>::value
+ && !std::is_convertible< optional<U> const & , T>::value
+ && !std::is_convertible< optional<U> const &&, T>::value
+ && std::is_convertible< U const & , T>::value /*=> non-explicit */
+ )
+#endif // optional_CPP11_OR_GREATER
+ >
+ // NOLINTNEXTLINE( google-explicit-constructor, hicpp-explicit-conversions )
+ /*non-explicit*/ optional( optional<U> const & other )
+ : has_value_( other.has_value() )
+ {
+ if ( other.has_value() )
+ {
+ contained.construct_value( other.contained.value() );
+ }
+ }
+
+#if optional_CPP11_OR_GREATER
+
+ // 5a (C++11) - explicit converting move-construct from optional
+ template< typename U
+ optional_REQUIRES_T(
+ std::is_constructible<T, U &&>::value
+ && !std::is_constructible<T, optional<U> & >::value
+ && !std::is_constructible<T, optional<U> && >::value
+ && !std::is_constructible<T, optional<U> const & >::value
+ && !std::is_constructible<T, optional<U> const && >::value
+ && !std::is_convertible< optional<U> & , T>::value
+ && !std::is_convertible< optional<U> && , T>::value
+ && !std::is_convertible< optional<U> const & , T>::value
+ && !std::is_convertible< optional<U> const &&, T>::value
+ && !std::is_convertible< U &&, T>::value /*=> explicit */
+ )
+ >
+ explicit optional( optional<U> && other
+ )
+ : has_value_( other.has_value() )
+ {
+ if ( other.has_value() )
+ {
+ contained.construct_value( T{ std::move( other.contained.value() ) } );
+ }
+ }
+
+ // 5a (C++11) - non-explicit converting move-construct from optional
+ template< typename U
+ optional_REQUIRES_T(
+ std::is_constructible<T, U &&>::value
+ && !std::is_constructible<T, optional<U> & >::value
+ && !std::is_constructible<T, optional<U> && >::value
+ && !std::is_constructible<T, optional<U> const & >::value
+ && !std::is_constructible<T, optional<U> const && >::value
+ && !std::is_convertible< optional<U> & , T>::value
+ && !std::is_convertible< optional<U> && , T>::value
+ && !std::is_convertible< optional<U> const & , T>::value
+ && !std::is_convertible< optional<U> const &&, T>::value
+ && std::is_convertible< U &&, T>::value /*=> non-explicit */
+ )
+ >
+ // NOLINTNEXTLINE( google-explicit-constructor, hicpp-explicit-conversions )
+ /*non-explicit*/ optional( optional<U> && other )
+ : has_value_( other.has_value() )
+ {
+ if ( other.has_value() )
+ {
+ contained.construct_value( std::move( other.contained.value() ) );
+ }
+ }
+
+ // 6 (C++11) - in-place construct
+ template< typename... Args
+ optional_REQUIRES_T(
+ std::is_constructible<T, Args&&...>::value
+ )
+ >
+ optional_constexpr explicit optional( nonstd_lite_in_place_t(T), Args&&... args )
+ : has_value_( true )
+ , contained( in_place, std::forward<Args>(args)... )
+ {}
+
+ // 7 (C++11) - in-place construct, initializer-list
+ template< typename U, typename... Args
+ optional_REQUIRES_T(
+ std::is_constructible<T, std::initializer_list<U>&, Args&&...>::value
+ )
+ >
+ optional_constexpr explicit optional( nonstd_lite_in_place_t(T), std::initializer_list<U> il, Args&&... args )
+ : has_value_( true )
+ , contained( T( il, std::forward<Args>(args)...) )
+ {}
+
+ // 8a (C++11) - explicit move construct from value
+ template< typename U = T
+ optional_REQUIRES_T(
+ std::is_constructible<T, U&&>::value
+ && !std::is_same<typename std20::remove_cvref<U>::type, nonstd_lite_in_place_t(U)>::value
+ && !std::is_same<typename std20::remove_cvref<U>::type, optional<T>>::value
+ && !std::is_convertible<U&&, T>::value /*=> explicit */
+ )
+ >
+ optional_constexpr explicit optional( U && value )
+ : has_value_( true )
+ , contained( nonstd_lite_in_place(T), std::forward<U>( value ) )
+ {}
+
+ // 8b (C++11) - non-explicit move construct from value
+ template< typename U = T
+ optional_REQUIRES_T(
+ std::is_constructible<T, U&&>::value
+ && !std::is_same<typename std20::remove_cvref<U>::type, nonstd_lite_in_place_t(U)>::value
+ && !std::is_same<typename std20::remove_cvref<U>::type, optional<T>>::value
+ && std::is_convertible<U&&, T>::value /*=> non-explicit */
+ )
+ >
+ // NOLINTNEXTLINE( google-explicit-constructor, hicpp-explicit-conversions )
+ optional_constexpr /*non-explicit*/ optional( U && value )
+ : has_value_( true )
+ , contained( nonstd_lite_in_place(T), std::forward<U>( value ) )
+ {}
+
+#else // optional_CPP11_OR_GREATER
+
+ // 8 (C++98)
+ optional( value_type const & value )
+ : has_value_( true )
+ , contained( value )
+ {}
+
+#endif // optional_CPP11_OR_GREATER
+
+ // x.x.3.2, destructor
+
+ ~optional()
+ {
+ if ( has_value() )
+ {
+ contained.destruct_value();
+ }
+ }
+
+ // x.x.3.3, assignment
+
+ // 1 (C++98and later) - assign explicitly empty
+ optional & operator=( nullopt_t /*unused*/) optional_noexcept
+ {
+ reset();
+ return *this;
+ }
+
+ // 2 (C++98and later) - copy-assign from optional
+#if optional_CPP11_OR_GREATER
+ // NOLINTNEXTLINE( cppcoreguidelines-c-copy-assignment-signature, misc-unconventional-assign-operator )
+ optional_REQUIRES_R(
+ optional &,
+ true
+// std::is_copy_constructible<T>::value
+// && std::is_copy_assignable<T>::value
+ )
+ operator=( optional const & other )
+ noexcept(
+ std11::is_nothrow_move_assignable<T>::value
+ && std11::is_nothrow_move_constructible<T>::value
+ )
+#else
+ optional & operator=( optional const & other )
+#endif
+ {
+ if ( (has_value() == true ) && (other.has_value() == false) ) { reset(); }
+ else if ( (has_value() == false) && (other.has_value() == true ) ) { initialize( *other ); }
+ else if ( (has_value() == true ) && (other.has_value() == true ) ) { contained.value() = *other; }
+ return *this;
+ }
+
+#if optional_CPP11_OR_GREATER
+
+ // 3 (C++11) - move-assign from optional
+ // NOLINTNEXTLINE( cppcoreguidelines-c-copy-assignment-signature, misc-unconventional-assign-operator )
+ optional_REQUIRES_R(
+ optional &,
+ true
+// std11::is_move_constructible<T>::value
+// && std::is_move_assignable<T>::value
+ )
+ operator=( optional && other ) noexcept
+ {
+ if ( (has_value() == true ) && (other.has_value() == false) ) { reset(); }
+ else if ( (has_value() == false) && (other.has_value() == true ) ) { initialize( std::move( *other ) ); }
+ else if ( (has_value() == true ) && (other.has_value() == true ) ) { contained.value() = std::move( *other ); }
+ return *this;
+ }
+
+ // 4 (C++11) - move-assign from value
+ template< typename U = T >
+ // NOLINTNEXTLINE( cppcoreguidelines-c-copy-assignment-signature, misc-unconventional-assign-operator )
+ optional_REQUIRES_R(
+ optional &,
+ std::is_constructible<T , U>::value
+ && std11::is_assignable<T&, U>::value
+ && !std::is_same<typename std20::remove_cvref<U>::type, nonstd_lite_in_place_t(U)>::value
+ && !std::is_same<typename std20::remove_cvref<U>::type, optional<T>>::value
+ && !(std::is_scalar<T>::value && std::is_same<T, typename std::decay<U>::type>::value)
+ )
+ operator=( U && value )
+ {
+ if ( has_value() )
+ {
+ contained.value() = std::forward<U>( value );
+ }
+ else
+ {
+ initialize( T( std::forward<U>( value ) ) );
+ }
+ return *this;
+ }
+
+#else // optional_CPP11_OR_GREATER
+
+ // 4 (C++98) - copy-assign from value
+ template< typename U /*= T*/ >
+ optional & operator=( U const & value )
+ {
+ if ( has_value() ) contained.value() = value;
+ else initialize( T( value ) );
+ return *this;
+ }
+
+#endif // optional_CPP11_OR_GREATER
+
+ // 5 (C++98 and later) - converting copy-assign from optional
+ template< typename U >
+#if optional_CPP11_OR_GREATER
+ // NOLINTNEXTLINE( cppcoreguidelines-c-copy-assignment-signature, misc-unconventional-assign-operator )
+ optional_REQUIRES_R(
+ optional&,
+ std::is_constructible< T , U const &>::value
+ && std11::is_assignable< T&, U const &>::value
+ && !std::is_constructible<T, optional<U> & >::value
+ && !std::is_constructible<T, optional<U> && >::value
+ && !std::is_constructible<T, optional<U> const & >::value
+ && !std::is_constructible<T, optional<U> const && >::value
+ && !std::is_convertible< optional<U> & , T>::value
+ && !std::is_convertible< optional<U> && , T>::value
+ && !std::is_convertible< optional<U> const & , T>::value
+ && !std::is_convertible< optional<U> const &&, T>::value
+ && !std11::is_assignable< T&, optional<U> & >::value
+ && !std11::is_assignable< T&, optional<U> && >::value
+ && !std11::is_assignable< T&, optional<U> const & >::value
+ && !std11::is_assignable< T&, optional<U> const && >::value
+ )
+#else
+ optional&
+#endif // optional_CPP11_OR_GREATER
+ operator=( optional<U> const & other )
+ {
+ return *this = optional( other );
+ }
+
+#if optional_CPP11_OR_GREATER
+
+ // 6 (C++11) - converting move-assign from optional
+ template< typename U >
+ // NOLINTNEXTLINE( cppcoreguidelines-c-copy-assignment-signature, misc-unconventional-assign-operator )
+ optional_REQUIRES_R(
+ optional&,
+ std::is_constructible< T , U>::value
+ && std11::is_assignable< T&, U>::value
+ && !std::is_constructible<T, optional<U> & >::value
+ && !std::is_constructible<T, optional<U> && >::value
+ && !std::is_constructible<T, optional<U> const & >::value
+ && !std::is_constructible<T, optional<U> const && >::value
+ && !std::is_convertible< optional<U> & , T>::value
+ && !std::is_convertible< optional<U> && , T>::value
+ && !std::is_convertible< optional<U> const & , T>::value
+ && !std::is_convertible< optional<U> const &&, T>::value
+ && !std11::is_assignable< T&, optional<U> & >::value
+ && !std11::is_assignable< T&, optional<U> && >::value
+ && !std11::is_assignable< T&, optional<U> const & >::value
+ && !std11::is_assignable< T&, optional<U> const && >::value
+ )
+ operator=( optional<U> && other )
+ {
+ return *this = optional( std::move( other ) );
+ }
+
+ // 7 (C++11) - emplace
+ template< typename... Args
+ optional_REQUIRES_T(
+ std::is_constructible<T, Args&&...>::value
+ )
+ >
+ T& emplace( Args&&... args )
+ {
+ *this = nullopt;
+ contained.emplace( std::forward<Args>(args)... );
+ has_value_ = true;
+ return contained.value();
+ }
+
+ // 8 (C++11) - emplace, initializer-list
+ template< typename U, typename... Args
+ optional_REQUIRES_T(
+ std::is_constructible<T, std::initializer_list<U>&, Args&&...>::value
+ )
+ >
+ T& emplace( std::initializer_list<U> il, Args&&... args )
+ {
+ *this = nullopt;
+ contained.emplace( il, std::forward<Args>(args)... );
+ has_value_ = true;
+ return contained.value();
+ }
+
+#endif // optional_CPP11_OR_GREATER
+
+ // x.x.3.4, swap
+
+ void swap( optional & other )
+#if optional_CPP11_OR_GREATER
+ noexcept(
+ std11::is_nothrow_move_constructible<T>::value
+ && std17::is_nothrow_swappable<T>::value
+ )
+#endif
+ {
+ using std::swap;
+ if ( (has_value() == true ) && (other.has_value() == true ) ) { swap( **this, *other ); }
+ else if ( (has_value() == false) && (other.has_value() == true ) ) { initialize( std11::move(*other) ); other.reset(); }
+ else if ( (has_value() == true ) && (other.has_value() == false) ) { other.initialize( std11::move(**this) ); reset(); }
+ }
+
+ // x.x.3.5, observers
+
+ optional_constexpr value_type const * operator ->() const
+ {
+ return assert( has_value() ),
+ contained.value_ptr();
+ }
+
+ optional_constexpr14 value_type * operator ->()
+ {
+ return assert( has_value() ),
+ contained.value_ptr();
+ }
+
+ optional_constexpr value_type const & operator *() const optional_ref_qual
+ {
+ return assert( has_value() ),
+ contained.value();
+ }
+
+ optional_constexpr14 value_type & operator *() optional_ref_qual
+ {
+ return assert( has_value() ),
+ contained.value();
+ }
+
+#if optional_HAVE( REF_QUALIFIER )
+
+ optional_constexpr value_type const && operator *() const optional_refref_qual
+ {
+ return std::move( **this );
+ }
+
+ optional_constexpr14 value_type && operator *() optional_refref_qual
+ {
+ return std::move( **this );
+ }
+
+#endif
+
+#if optional_CPP11_OR_GREATER
+ optional_constexpr explicit operator bool() const optional_noexcept
+ {
+ return has_value();
+ }
+#else
+ optional_constexpr operator safe_bool() const optional_noexcept
+ {
+ return has_value() ? &optional::this_type_does_not_support_comparisons : 0;
+ }
+#endif
+
+ // NOLINTNEXTLINE( modernize-use-nodiscard )
+ /*optional_nodiscard*/ optional_constexpr bool has_value() const optional_noexcept
+ {
+ return has_value_;
+ }
+
+ // NOLINTNEXTLINE( modernize-use-nodiscard )
+ /*optional_nodiscard*/ optional_constexpr14 value_type const & value() const optional_ref_qual
+ {
+#if optional_CONFIG_NO_EXCEPTIONS
+ assert( has_value() );
+#else
+ if ( ! has_value() )
+ {
+ throw bad_optional_access();
+ }
+#endif
+ return contained.value();
+ }
+
+ optional_constexpr14 value_type & value() optional_ref_qual
+ {
+#if optional_CONFIG_NO_EXCEPTIONS
+ assert( has_value() );
+#else
+ if ( ! has_value() )
+ {
+ throw bad_optional_access();
+ }
+#endif
+ return contained.value();
+ }
+
+#if optional_HAVE( REF_QUALIFIER ) && ( !optional_COMPILER_GNUC_VERSION || optional_COMPILER_GNUC_VERSION >= 490 )
+
+ // NOLINTNEXTLINE( modernize-use-nodiscard )
+ /*optional_nodiscard*/ optional_constexpr value_type const && value() const optional_refref_qual
+ {
+ return std::move( value() );
+ }
+
+ optional_constexpr14 value_type && value() optional_refref_qual
+ {
+ return std::move( value() );
+ }
+
+#endif
+
+#if optional_HAVE( REF_QUALIFIER )
+
+ template< typename U >
+ optional_constexpr value_type value_or( U && v ) const optional_ref_qual
+ {
+ return has_value() ? contained.value() : static_cast<T>(std::forward<U>( v ) );
+ }
+
+ template< typename U >
+ optional_constexpr14 value_type value_or( U && v ) optional_refref_qual
+ {
+#if optional_COMPILER_CLANG_VERSION
+ return has_value() ? /*std::move*/( contained.value() ) : static_cast<T>(std::forward<U>( v ) );
+#else
+ return has_value() ? std::move( contained.value() ) : static_cast<T>(std::forward<U>( v ) );
+#endif
+ }
+
+#else
+
+ template< typename U >
+ optional_constexpr value_type value_or( U const & v ) const
+ {
+ return has_value() ? contained.value() : static_cast<value_type>( v );
+ }
+
+#endif // optional_HAVE( REF_QUALIFIER )
+
+#if !optional_CONFIG_NO_EXTENSIONS
+#if optional_HAVE( REF_QUALIFIER )
+
+ template< typename F >
+ optional_constexpr value_type value_or_eval( F f ) const &
+ {
+ return has_value() ? contained.value() : f();
+ }
+
+ template< typename F >
+ optional_constexpr14 value_type value_or_eval( F f ) &&
+ {
+ if ( has_value() )
+ {
+ return std::move( contained.value() );
+ }
+ else
+ {
+ return f();
+ }
+ }
+
+#else
+
+ template< typename F >
+ optional_constexpr value_type value_or_eval( F f ) const
+ {
+ return has_value() ? contained.value() : f();
+ }
+
+#endif // optional_HAVE( REF_QUALIFIER )
+#endif // !optional_CONFIG_NO_EXTENSIONS
+
+ // x.x.3.6, modifiers
+
+ void reset() optional_noexcept
+ {
+ if ( has_value() )
+ {
+ contained.destruct_value();
+ }
+
+ has_value_ = false;
+ }
+
+private:
+ void this_type_does_not_support_comparisons() const {}
+
+ template< typename V >
+ void initialize( V const & value )
+ {
+ assert( ! has_value() );
+ contained.construct_value( value );
+ has_value_ = true;
+ }
+
+#if optional_CPP11_OR_GREATER
+ template< typename V >
+ void initialize( V && value )
+ {
+ assert( ! has_value() );
+ contained.construct_value( std::move( value ) );
+ has_value_ = true;
+ }
+
+#endif
+
+private:
+ bool has_value_;
+ detail::storage_t< value_type > contained;
+
+};
+
+// Relational operators
+
+template< typename T, typename U >
+optional_nodiscard optional_constexpr bool operator==( optional<T> const & x, optional<U> const & y )
+{
+ return bool(x) != bool(y) ? false : !bool( x ) ? true : *x == *y;
+}
+
+template< typename T, typename U >
+optional_nodiscard optional_constexpr bool operator!=( optional<T> const & x, optional<U> const & y )
+{
+ return !(x == y);
+}
+
+template< typename T, typename U >
+optional_nodiscard optional_constexpr bool operator<( optional<T> const & x, optional<U> const & y )
+{
+ return (!y) ? false : (!x) ? true : *x < *y;
+}
+
+template< typename T, typename U >
+optional_nodiscard optional_constexpr bool operator>( optional<T> const & x, optional<U> const & y )
+{
+ return (y < x);
+}
+
+template< typename T, typename U >
+optional_nodiscard optional_constexpr bool operator<=( optional<T> const & x, optional<U> const & y )
+{
+ return !(y < x);
+}
+
+template< typename T, typename U >
+optional_nodiscard optional_constexpr bool operator>=( optional<T> const & x, optional<U> const & y )
+{
+ return !(x < y);
+}
+
+// Comparison with nullopt
+
+template< typename T >
+optional_nodiscard optional_constexpr bool operator==( optional<T> const & x, nullopt_t /*unused*/ ) optional_noexcept
+{
+ return (!x);
+}
+
+template< typename T >
+optional_nodiscard optional_constexpr bool operator==( nullopt_t /*unused*/, optional<T> const & x ) optional_noexcept
+{
+ return (!x);
+}
+
+template< typename T >
+optional_nodiscard optional_constexpr bool operator!=( optional<T> const & x, nullopt_t /*unused*/ ) optional_noexcept
+{
+ return bool(x);
+}
+
+template< typename T >
+optional_nodiscard optional_constexpr bool operator!=( nullopt_t /*unused*/, optional<T> const & x ) optional_noexcept
+{
+ return bool(x);
+}
+
+template< typename T >
+optional_nodiscard optional_constexpr bool operator<( optional<T> const & /*unused*/, nullopt_t /*unused*/ ) optional_noexcept
+{
+ return false;
+}
+
+template< typename T >
+optional_nodiscard optional_constexpr bool operator<( nullopt_t /*unused*/, optional<T> const & x ) optional_noexcept
+{
+ return bool(x);
+}
+
+template< typename T >
+optional_nodiscard optional_constexpr bool operator<=( optional<T> const & x, nullopt_t /*unused*/ ) optional_noexcept
+{
+ return (!x);
+}
+
+template< typename T >
+optional_nodiscard optional_constexpr bool operator<=( nullopt_t /*unused*/, optional<T> const & /*unused*/ ) optional_noexcept
+{
+ return true;
+}
+
+template< typename T >
+optional_nodiscard optional_constexpr bool operator>( optional<T> const & x, nullopt_t /*unused*/ ) optional_noexcept
+{
+ return bool(x);
+}
+
+template< typename T >
+optional_nodiscard optional_constexpr bool operator>( nullopt_t /*unused*/, optional<T> const & /*unused*/ ) optional_noexcept
+{
+ return false;
+}
+
+template< typename T >
+optional_nodiscard optional_constexpr bool operator>=( optional<T> const & /*unused*/, nullopt_t /*unused*/ ) optional_noexcept
+{
+ return true;
+}
+
+template< typename T >
+optional_nodiscard optional_constexpr bool operator>=( nullopt_t /*unused*/, optional<T> const & x ) optional_noexcept
+{
+ return (!x);
+}
+
+// Comparison with T
+
+template< typename T, typename U >
+optional_nodiscard optional_constexpr bool operator==( optional<T> const & x, U const & v )
+{
+ return bool(x) ? *x == v : false;
+}
+
+template< typename T, typename U >
+optional_nodiscard optional_constexpr bool operator==( U const & v, optional<T> const & x )
+{
+ return bool(x) ? v == *x : false;
+}
+
+template< typename T, typename U >
+optional_nodiscard optional_constexpr bool operator!=( optional<T> const & x, U const & v )
+{
+ return bool(x) ? *x != v : true;
+}
+
+template< typename T, typename U >
+optional_nodiscard optional_constexpr bool operator!=( U const & v, optional<T> const & x )
+{
+ return bool(x) ? v != *x : true;
+}
+
+template< typename T, typename U >
+optional_nodiscard optional_constexpr bool operator<( optional<T> const & x, U const & v )
+{
+ return bool(x) ? *x < v : true;
+}
+
+template< typename T, typename U >
+optional_nodiscard optional_constexpr bool operator<( U const & v, optional<T> const & x )
+{
+ return bool(x) ? v < *x : false;
+}
+
+template< typename T, typename U >
+optional_nodiscard optional_constexpr bool operator<=( optional<T> const & x, U const & v )
+{
+ return bool(x) ? *x <= v : true;
+}
+
+template< typename T, typename U >
+optional_nodiscard optional_constexpr bool operator<=( U const & v, optional<T> const & x )
+{
+ return bool(x) ? v <= *x : false;
+}
+
+template< typename T, typename U >
+optional_nodiscard optional_constexpr bool operator>( optional<T> const & x, U const & v )
+{
+ return bool(x) ? *x > v : false;
+}
+
+template< typename T, typename U >
+optional_nodiscard optional_constexpr bool operator>( U const & v, optional<T> const & x )
+{
+ return bool(x) ? v > *x : true;
+}
+
+template< typename T, typename U >
+optional_nodiscard optional_constexpr bool operator>=( optional<T> const & x, U const & v )
+{
+ return bool(x) ? *x >= v : false;
+}
+
+template< typename T, typename U >
+optional_nodiscard optional_constexpr bool operator>=( U const & v, optional<T> const & x )
+{
+ return bool(x) ? v >= *x : true;
+}
+
+// Specialized algorithms
+
+template< typename T
+#if optional_CPP11_OR_GREATER
+ optional_REQUIRES_T(
+ std11::is_move_constructible<T>::value
+ && std17::is_swappable<T>::value )
+#endif
+>
+void swap( optional<T> & x, optional<T> & y )
+#if optional_CPP11_OR_GREATER
+ noexcept( noexcept( x.swap(y) ) )
+#endif
+{
+ x.swap( y );
+}
+
+#if optional_CPP11_OR_GREATER
+
+template< typename T >
+optional_constexpr optional< typename std::decay<T>::type > make_optional( T && value )
+{
+ return optional< typename std::decay<T>::type >( std::forward<T>( value ) );
+}
+
+template< typename T, typename...Args >
+optional_constexpr optional<T> make_optional( Args&&... args )
+{
+ return optional<T>( nonstd_lite_in_place(T), std::forward<Args>(args)...);
+}
+
+template< typename T, typename U, typename... Args >
+optional_constexpr optional<T> make_optional( std::initializer_list<U> il, Args&&... args )
+{
+ return optional<T>( nonstd_lite_in_place(T), il, std::forward<Args>(args)...);
+}
+
+#else
+
+template< typename T >
+optional<T> make_optional( T const & value )
+{
+ return optional<T>( value );
+}
+
+#endif // optional_CPP11_OR_GREATER
+
+} // namespace optional_lite
+
+using optional_lite::optional;
+using optional_lite::nullopt_t;
+using optional_lite::nullopt;
+
+#if ! optional_CONFIG_NO_EXCEPTIONS
+using optional_lite::bad_optional_access;
+#endif
+
+using optional_lite::make_optional;
+
+} // namespace nonstd
+
+#if optional_CPP11_OR_GREATER
+
+// specialize the std::hash algorithm:
+
+namespace std {
+
+template< class T >
+struct hash< nonstd::optional<T> >
+{
+public:
+ std::size_t operator()( nonstd::optional<T> const & v ) const optional_noexcept
+ {
+ return bool( v ) ? std::hash<T>{}( *v ) : 0;
+ }
+};
+
+} //namespace std
+
+#endif // optional_CPP11_OR_GREATER
+
+#if defined(__clang__)
+# pragma clang diagnostic pop
+#elif defined(__GNUC__)
+# pragma GCC diagnostic pop
+#elif defined(_MSC_VER )
+# pragma warning( pop )
+#endif
+
+#endif // optional_USES_STD_OPTIONAL
+
+#endif // NONSTD_OPTIONAL_LITE_HPP
# We want an absolute starting directory because find(1) excludes
# files in specific subdirectories.
find "$(realpath "$root_dir")" \( -name '*.cpp' -o -name '*.hpp' \) \
- ! -path '*/src/cpp-common/optional.hpp' \
+ ! -path '*/src/cpp-common/vendor/*' \
! -path '*/src/cpp-common/string_view.hpp' \
! -path '*/src/cpp-common/nlohmann/json.hpp' \
! -path '*/src/plugins/ctf/common/metadata/parser.*' \
projects / babeltrace.git / commitdiff
