src/cpp-common/bt2/clock-snapshot.hpp

   1 /*
   2  * Copyright (c) 2020 Philippe Proulx <pproulx@efficios.com>
   3  *
   4  * SPDX-License-Identifier: MIT
   5  */
   6
   7 #ifndef BABELTRACE_CPP_COMMON_BT2_CLOCK_SNAPSHOT_HPP
   8 #define BABELTRACE_CPP_COMMON_BT2_CLOCK_SNAPSHOT_HPP
   9
  10 #include <cstdint>
  11 #include <babeltrace2/babeltrace.h>
  12
  13 #include "internal/borrowed-obj.hpp"
  14 #include "lib-error.hpp"
  15
  16 namespace bt2 {
  17
  18 class ConstClockSnapshot final : public internal::BorrowedObj<const bt_clock_snapshot>
  19 {
  20 public:
  21     explicit ConstClockSnapshot(const _LibObjPtr libObjPtr) noexcept : _ThisBorrowedObj {libObjPtr}
  22     {
  23     }
  24
  25     ConstClockSnapshot(const ConstClockSnapshot& clkSnapshot) noexcept :
  26         _ThisBorrowedObj {clkSnapshot}
  27     {
  28     }
  29
  30     ConstClockSnapshot& operator=(const ConstClockSnapshot& clkSnapshot) noexcept
  31     {
  32         _ThisBorrowedObj::operator=(clkSnapshot);
  33         return *this;
  34     }
  35
  36     std::uint64_t value() const noexcept
  37     {
  38         return bt_clock_snapshot_get_value(this->_libObjPtr());
  39     }
  40
  41     operator std::uint64_t() const noexcept
  42     {
  43         return this->value();
  44     }
  45
  46     std::int64_t nsFromOrigin() const
  47     {
  48         std::int64_t nsFromOrigin;
  49         const auto status = bt_clock_snapshot_get_ns_from_origin(this->_libObjPtr(), &nsFromOrigin);
  50
  51         if (status == BT_CLOCK_SNAPSHOT_GET_NS_FROM_ORIGIN_STATUS_OVERFLOW_ERROR) {
  52             throw LibOverflowError {};
  53         }
  54
  55         return nsFromOrigin;
  56     }
  57 };
  58
  59 } // namespace bt2
  60
  61 #endif // BABELTRACE_CPP_COMMON_BT2_CLOCK_SNAPSHOT_HPP