TypedID.hpp

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//
//  CeresEngine - A game development framework
//
//  Created by Rogiel Sulzbach.
//  Copyright (c) 2018-2022 Rogiel Sulzbach. All rights reserved.
//
 
#pragma once
 
#include <functional>
 
namespace CeresEngine {
 
    template<typename Tag, typename TType> struct TypedID {
        using Type = TType;
 
    public:
        Type raw;
 
    public:
        static constexpr Type Default = TType();
 
        constexpr TypedID() noexcept : raw(0) {}
        explicit constexpr TypedID(Type raw) noexcept : raw(raw) {}
 
    public:
        [[nodiscard]] explicit constexpr operator Type() const noexcept { return raw; }
        [[nodiscard]] constexpr Type getValue() const noexcept { return raw; }
 
        [[nodiscard]] constexpr bool operator==(const TypedID& value) const noexcept { return raw == value.raw; }
        [[nodiscard]] constexpr bool operator!=(const TypedID& value) const noexcept { return !(*this == value); }
 
        [[nodiscard]] constexpr bool isValid() const noexcept { return raw != Default; }
    };
 
} // namespace CeresEngine
 
template<typename Tag, typename Type> struct std::hash<CeresEngine::TypedID<Tag, Type>> {
    using result_type = std::size_t;
    using argument_type = CeresEngine::TypedID<Tag, Type>;
 
    result_type operator()(const argument_type& id) const { return std::hash<Type>{}(id.raw); }
};