comparison.hxx

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/*
 * Copyright (C) 2024-2026 David C. Manuelda (StormBytePP)
 *
 * This file is part of StormByte.
 *
 * StormByte is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * or later, as published by the Free Software Foundation.
 *
 * StormByte is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with StormByte. If not, see
 * <https://www.gnu.org/licenses/lgpl-3.0.html>.
 */
 
#pragma once
 
#include <concepts>
#include <cstddef>
#include <functional>
#include <type_traits>
 
namespace StormByte {
    namespace Type {
        template<typename T>
        concept EqualityComparable =
            requires(std::remove_cvref_t<T> const& a, std::remove_cvref_t<T> const& b) {
                { a == b } -> std::convertible_to<bool>;
                { a != b } -> std::convertible_to<bool>;
            };
 
        template<typename T>
        concept ThreeWayComparable =
            requires(std::remove_cvref_t<T> const& a, std::remove_cvref_t<T> const& b) {
                { a <=> b };
            };
 
        template<typename T>
        concept Hashable =
            requires(std::remove_cvref_t<T> const& t) {
                { std::hash<std::remove_cvref_t<T>>{}(t) } -> std::convertible_to<std::size_t>;
            };
    }
}