jeanlemotan
55 lines
1.7 KiB
C++
55 lines
1.7 KiB
C++
#pragma once
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#include "tl/detail/prologue.h"
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#include "tl/hash_map.h"
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#include <compare>
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namespace tl
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{
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template<typename T, T invalid_value, typename Tag>
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struct identifier
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{
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using underlying_type = T;
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constexpr identifier() noexcept = default;
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explicit constexpr identifier(T value) noexcept : m_value(std::move(value)) {}
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constexpr T value() const noexcept { return m_value; }
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constexpr bool is_valid() const noexcept { return m_value != invalid_value; }
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//inline static identifier<T, invalid_value, Tag> invalid() noexcept { return identifier<T, invalid_value, Tag>(); }
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auto operator<=>(const identifier<T, invalid_value, Tag>& other) const noexcept { return m_value <=> other.value(); }
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auto operator<=>(const T& other) const noexcept { return m_value <=> other; }
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bool operator==(const identifier<T, invalid_value, Tag>& other) const noexcept { return m_value == other.value(); }
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bool operator==(const T& other) const noexcept { return m_value == other; }
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private:
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T m_value = invalid_value;
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};
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}
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#define TL_DECLARE_INTEGRAL_ID(NAME, TYPE, INVALID_VALUE) \
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struct NAME##_tag {};\
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using NAME = tl::identifier<TYPE, INVALID_VALUE, NAME##_tag>;
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template <typename T, T invalid_value, typename Tag>
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struct std::formatter<tl::identifier<T, invalid_value, Tag>>
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{
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constexpr auto parse(format_parse_context& ctx) noexcept { return ctx.begin(); }
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auto format(const tl::identifier<T, invalid_value, Tag>& id, std::format_context& ctx) const
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{
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return format_to(ctx.out(), "{}", id.value());
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}
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};
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template<typename T, T invalid_value, typename Tag>
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struct eastl::hash<tl::identifier<T, invalid_value, Tag>>
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{
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size_t operator()(tl::identifier<T, invalid_value, Tag> const& id) const
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{
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return hash<T>()(id.value());
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}
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};
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