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46 lines
1.6 KiB
46 lines
1.6 KiB
#pragma once
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namespace id {
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struct uuid {
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//TODO: constexpr uuid_v4 impl
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constexpr uuid v4() noexcept {
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//TODO: Generate new UUID at compile time?
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}
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};
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struct unique_ref {
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uuid id;
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constexpr friend auto operator<=>(unique_ref const& a, unique_ref const& b) noexcept = default;
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};
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struct unique {
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constexpr unique() noexcept
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: m_id(uuid::v4()) {}
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constexpr unique(const unique&) noexcept
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: unique() {}
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constexpr unique(unique&&) noexcept = default;
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constexpr unique& operator=(unique&&) noexcept = default;
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constexpr unique& operator=(unique const& b) noexcept
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{ if(this != std::addressof(b)) m_id = uuid::v4(); return *this; }
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constexpr virtual ~unique() = default;
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template<std::derived_from<unique> T, std::derived_from<unique> U>
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constexpr friend bool operator==(T const& a, U const& b) noexcept { return static_cast<unique const&>(a) == static_cast<unique const&>(b); }
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template<std::derived_from<unique> T, std::derived_from<unique> U>
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constexpr friend bool operator!=(T const& a, U const& b) noexcept { return !(a == b); }
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constexpr friend bool operator==(unique const& a, unique const& b) noexcept { return a.unique_id() == b.unique_id(); }
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constexpr friend bool operator!=(unique const& a, unique const& b) noexcept { return a.unique_id() != b.unique_id(); }
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constexpr unique_ref unique_id() const noexcept { return { m_id }; }
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protected:
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constexpr uuid& raw_id() noexcept { return m_id; }
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constexpr uuid const& raw_id() const noexcept { return m_id; }
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constexpr explicit unique(std::convertible_to<uuid> auto&& id)
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: m_id(std::move(id)) {}
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private:
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uuid m_id;
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};
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}
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