iter_concept.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/has_iterator_traits_iterator_category.hpp"
#include "CeresEngine/Foundation/Traits/has_iterator_traits_iterator_concept.hpp"
#include "CeresEngine/Foundation/Traits/remove_cvref.hpp"
 
#include <iterator>
#include <type_traits>
 
namespace CeresEngine::traits {
 
    template<class T, class = void> struct iter_concept {};
 
    template<class T>
    struct iter_concept<T,
        std::enable_if_t<
            // clang-format off
            has_iterator_traits_iterator_concept_v<remove_cvref_t<T>>
            // clang-format on
            >> {
        using type = typename std::iterator_traits<remove_cvref_t<T>>::iterator_concept;
    };
 
    template<class T>
    struct iter_concept<T,
        std::enable_if_t<
            // clang-format off
            !has_iterator_traits_iterator_concept_v<remove_cvref_t<T>> &&
            has_iterator_traits_iterator_category_v<remove_cvref_t<T>>
            // clang-format on
            >> {
        using type = typename std::iterator_traits<remove_cvref_t<T>>::iterator_category;
    };
 
    template<class T>
    struct iter_concept<T,
        std::enable_if_t<
            // clang-format off
            !has_iterator_traits_iterator_concept_v<remove_cvref_t<T>> &&
            !has_iterator_traits_iterator_category_v<remove_cvref_t<T>>
            // clang-format on
            >> {
        using type = std::random_access_iterator_tag;
    };
 
    template<class T> using iter_concept_t = typename iter_concept<T>::type;
 
} // namespace CeresEngine::traits