is_totally_ordered.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 "CeresEngine/Foundation/Traits/is_equality_comparable.hpp"
 
#include <type_traits>
 
namespace CeresEngine::traits {
 
    template<class T, class = void> struct is_totally_ordered : std::false_type {};
 
    template<class T>
    struct is_totally_ordered<T,
        std::void_t<
            // clang-format off
            decltype(std::declval<const std::remove_reference_t<T>&>() < std::declval<const std::remove_reference_t<T>&>()),
            decltype(std::declval<const std::remove_reference_t<T>&>() > std::declval<const std::remove_reference_t<T>&>()),
            decltype(std::declval<const std::remove_reference_t<T>&>() <= std::declval<const std::remove_reference_t<T>&>()),
            decltype(std::declval<const std::remove_reference_t<T>&>() >= std::declval<const std::remove_reference_t<T>&>())
            // clang-format on
            >> : is_equality_comparable<T> {};
 
    template<class T> bool constexpr is_totally_ordered_v = is_totally_ordered<T>::value;
 
    template<class T>
    concept totally_ordered = is_totally_ordered_v<T>;
 
} // namespace CeresEngine::traits