is_indirectly_readable.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/iter_reference.hpp"
#include "CeresEngine/Foundation/Traits/iter_rvalue_reference.hpp"
#include "CeresEngine/Foundation/Traits/iter_value.hpp"
 
#include <type_traits>
 
namespace CeresEngine::traits {
 
    template<class T, class = void> struct is_indirectly_readable : std::false_type {};
 
    template<class T>
    struct is_indirectly_readable<T, std::void_t<iter_value_t<T>, iter_reference_t<T>, iter_rvalue_reference_t<T>, decltype(*std::declval<T>())>>
            : std::true_type {};
 
    template<> struct is_indirectly_readable<void*> : std::false_type {};
    template<> struct is_indirectly_readable<const void*> : std::false_type {};
 
    template<class T> bool constexpr is_indirectly_readable_v = is_indirectly_readable<T>::value;
 
    template<class T>
    concept indirectly_readable = is_indirectly_readable_v<T>;
 
} // namespace CeresEngine::traits