is_indirectly_unary_invocable.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_convertible_to.hpp"
#include "CeresEngine/Foundation/Traits/is_indirectly_readable.hpp"
#include "CeresEngine/Foundation/Traits/iter_value.hpp"
 
#include <type_traits>
 
namespace CeresEngine::traits {
 
    template<class F, class I, class = void> struct is_indirectly_unary_invocable : std::false_type {};
 
    template<class F, class I>
    struct is_indirectly_unary_invocable<F, I,
        std::enable_if_t<
            // clang-format off
            is_indirectly_readable_v<I> &&
            std::is_copy_constructible_v<F> &&
            std::is_invocable_v<F&, iter_value_t<I>&>
            // clang-format on
            >> : std::true_type {};
 
    template<class F, class I> bool constexpr is_indirectly_unary_invocable_v = is_indirectly_unary_invocable<F, I>::value;
 
    template<class F, class I>
    concept indirectly_unary_invocable = is_indirectly_unary_invocable_v<F, I>;
 
} // namespace CeresEngine::traits