UUID.h

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#pragma once

 
#include <compare>
#include <cstddef>
#include <cstdint>
#include <functional>
#include <optional>
#include <string>
#include <string_view>
 
namespace Quasar
{
    class UUID
    {
    public:
        constexpr UUID() = default;

        constexpr explicit UUID(std::uint64_t value) : m_Value(value) {}

        static UUID Generate();

        constexpr std::uint64_t GetValue() const { return m_Value; }

        constexpr bool IsValid() const { return m_Value != 0; }

        std::string ToString() const;

        static std::optional<UUID> FromString(std::string_view text);

        constexpr auto operator<=>(const UUID&) const = default;
 
    private:
        std::uint64_t m_Value = 0;
    };

    inline std::string format_as(UUID uuid)
    {
        return uuid.ToString();
    }
}
 
namespace std
{
    template <>
    struct hash<Quasar::UUID>
    {
        std::size_t operator()(const Quasar::UUID& uuid) const noexcept { return std::hash<std::uint64_t>{}(uuid.GetValue()); }
    };
}