Entity.h

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// SPDX-FileCopyrightText: 2026 Valentin Eloy
// SPDX-License-Identifier: GPL-3.0-or-later
 
#pragma once
 
#include <cstdint>

 
namespace core {

struct Entity {
    using Index = std::uint32_t;
    using Generation = std::uint32_t;

    static constexpr Index INVALID_INDEX = ~Index{0};
 
    Index index = INVALID_INDEX;
    Generation generation = 0;

    [[nodiscard]] friend bool operator==(const Entity& lhs, const Entity& rhs) {
        return lhs.index == rhs.index && lhs.generation == rhs.generation;
    }
 
    [[nodiscard]] friend bool operator!=(const Entity& lhs, const Entity& rhs) {
        return !(lhs == rhs);
    }
};

inline constexpr Entity INVALID_ENTITY{Entity::INVALID_INDEX, 0};
 
}  // namespace core