is_sentinel_for.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_input_or_output_iterator.hpp"
#include "CeresEngine/Foundation/Traits/is_semiregular.hpp"
 
#include <type_traits>
 
namespace CeresEngine::traits {
 
    template<class S, class I, class = void> struct is_sentinel_for : std::false_type {};
 
    template<class S, class I>
    struct is_sentinel_for<S, I,
        std::enable_if_t<
            // clang-format off
            std::is_same_v<S, I> ||
            (is_semiregular_v<S> &&
             is_input_or_output_iterator_v<I>)
            // clang-format on
            >> : std::true_type {};
 
    template<class S, class I> bool constexpr is_sentinel_for_v = is_sentinel_for<S, I>::value;
 
    template<class S, class I>
    concept sentinel_for = is_sentinel_for_v<S, I>;
 
} // namespace CeresEngine::traits