| 1 | /* |
| 2 | * Copyright (c) 2020 Philippe Proulx <pproulx@efficios.com> |
| 3 | * |
| 4 | * SPDX-License-Identifier: MIT |
| 5 | */ |
| 6 | |
| 7 | #ifndef BABELTRACE_CPP_COMMON_UUID_VIEW_HPP |
| 8 | #define BABELTRACE_CPP_COMMON_UUID_VIEW_HPP |
| 9 | |
| 10 | #include <array> |
| 11 | #include <cstdint> |
| 12 | #include <string> |
| 13 | #include <algorithm> |
| 14 | |
| 15 | #include "common/assert.h" |
| 16 | #include "common/uuid.h" |
| 17 | |
| 18 | namespace bt2_common { |
| 19 | |
| 20 | class Uuid; |
| 21 | |
| 22 | /* |
| 23 | * A view on existing UUID data. |
| 24 | * |
| 25 | * A `UuidView` object doesn't contain its UUID data: see `Uuid` for a |
| 26 | * UUID data container. |
| 27 | */ |
| 28 | class UuidView final |
| 29 | { |
| 30 | public: |
| 31 | using Val = std::uint8_t; |
| 32 | using ConstIter = const Val *; |
| 33 | |
| 34 | public: |
| 35 | explicit UuidView(const Val * const uuid) noexcept : _mUuid {uuid} |
| 36 | { |
| 37 | BT_ASSERT_DBG(uuid); |
| 38 | } |
| 39 | |
| 40 | explicit UuidView(const Uuid& uuid) noexcept; |
| 41 | UuidView(const UuidView&) noexcept = default; |
| 42 | UuidView& operator=(const UuidView&) noexcept = default; |
| 43 | |
| 44 | UuidView& operator=(const Val * const uuid) noexcept |
| 45 | { |
| 46 | _mUuid = uuid; |
| 47 | return *this; |
| 48 | } |
| 49 | |
| 50 | operator Uuid() const noexcept; |
| 51 | |
| 52 | std::string str() const |
| 53 | { |
| 54 | std::string s; |
| 55 | |
| 56 | s.resize(BT_UUID_STR_LEN); |
| 57 | bt_uuid_to_str(_mUuid, &s[0]); |
| 58 | |
| 59 | return s; |
| 60 | } |
| 61 | |
| 62 | bool operator==(const UuidView& other) const noexcept |
| 63 | { |
| 64 | return bt_uuid_compare(_mUuid, other._mUuid) == 0; |
| 65 | } |
| 66 | |
| 67 | bool operator!=(const UuidView& other) const noexcept |
| 68 | { |
| 69 | return !(*this == other); |
| 70 | } |
| 71 | |
| 72 | bool operator<(const UuidView& other) const noexcept |
| 73 | { |
| 74 | return bt_uuid_compare(_mUuid, other._mUuid) < 0; |
| 75 | } |
| 76 | |
| 77 | static constexpr std::size_t size() noexcept |
| 78 | { |
| 79 | return BT_UUID_LEN; |
| 80 | } |
| 81 | |
| 82 | const Val *data() const noexcept |
| 83 | { |
| 84 | return _mUuid; |
| 85 | } |
| 86 | |
| 87 | Val operator[](const std::size_t index) const noexcept |
| 88 | { |
| 89 | return _mUuid[index]; |
| 90 | } |
| 91 | |
| 92 | ConstIter begin() const noexcept |
| 93 | { |
| 94 | return _mUuid; |
| 95 | } |
| 96 | |
| 97 | ConstIter end() const noexcept |
| 98 | { |
| 99 | return _mUuid + this->size(); |
| 100 | } |
| 101 | |
| 102 | bool isNil() const noexcept |
| 103 | { |
| 104 | return std::all_of(this->begin(), this->end(), [](const std::uint8_t byte) { |
| 105 | return byte == 0; |
| 106 | }); |
| 107 | } |
| 108 | |
| 109 | private: |
| 110 | const Val *_mUuid; |
| 111 | }; |
| 112 | |
| 113 | } /* namespace bt2_common */ |
| 114 | |
| 115 | #endif /* BABELTRACE_CPP_COMMON_UUID_VIEW_HPP */ |