Guid.ixx File

Lightweight GUID (globally unique identifier) implementation. More...

Included Headers

#include <atomic> #include <cstdint> #include <cstddef> #include <helios.ecs.types>

Namespaces Index

namespace	helios
namespace	engine
namespace	util

Classes Index

class	Guid
	Representative of a Globally Unique Identifier. More...
struct	hash<helios::engine::util::Guid>

Description

Lightweight GUID (globally unique identifier) implementation.

File Listing

The file content with the documentation metadata removed is:

1

5module;

6

7#include <atomic>

8#include <cstdint>

9#include <cstddef>

10

11export module helios.engine.util.Guid;

12

13import helios.ecs.types;

14

15

16export namespace helios::engine::util {

17

18

24 class Guid final {

25 private:

26 explicit Guid(uint64_t value) noexcept : value_(value) {}

27 uint64_t value_{};

28

29 public:

30

34 explicit Guid(helios::ecs::types::no_init_t) {};

35

43 constexpr bool operator==(const Guid& guid) const = default;

44

52 constexpr bool operator!=(const Guid& guid) const = default;

53

61 constexpr bool operator<(const Guid& guid) const noexcept {

62 return value_ < guid.value();

63 }

64

72 constexpr bool operator>(const Guid& guid) const noexcept {

73 return value_ > guid.value();

74 }

75

76

85 static Guid generate() noexcept {

86 static std::atomic<uint64_t> counter{1};

87 return Guid(counter.fetch_add(1, std::memory_order_relaxed));

88 }

89

95 [[nodiscard]] constexpr uint64_t value() const noexcept {

96 return value_;

97 }

98

106 [[nodiscard]] std::size_t hash() const noexcept {

107 return std::hash<uint64_t>{}(value_);

108 }

109

110 };

111

112} // namespace helios::engine::util

113

114

115template<>

116struct std::hash<helios::engine::util::Guid> {

117 std::size_t operator()(const helios::engine::util::Guid& guid) const noexcept {

118 return guid.hash();

119 }

120};

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