isContainer.hpp

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// Copyright (c) 2020-2025 Cody R. Drisko. All rights reserved.
// Licensed under the MIT License. See the LICENSE file in the project root for more information.
//
// Name: isContainer.hpp
// Author: crdrisko
// Date: 09/15/2020-08:38:28
// Description: A type trait for determining whether a type T meets the requirements of a container
 
#ifndef DRYCHEM_COMMON_UTILITIES_INCLUDE_COMMON_UTILS_META_TRAITS_CONTAINERTRAITS_ISCONTAINER_HPP
#define DRYCHEM_COMMON_UTILITIES_INCLUDE_COMMON_UTILS_META_TRAITS_CONTAINERTRAITS_ISCONTAINER_HPP
 
#include <type_traits>
#include <utility>
 
namespace CppUtils::Meta
{
    template<typename, typename = std::void_t<>>
    struct is_container : std::false_type
    {
    };

    template<typename T>
    struct is_container<T, std::void_t<typename T::value_type,
                                       typename T::reference,
                                       typename T::const_reference,
                                       typename T::iterator,
                                       typename T::const_iterator,
                                       typename T::difference_type,
                                       typename T::size_type,
                                       decltype(std::declval<T>().begin()),
                                       decltype(std::declval<T>().end()),
                                       decltype(std::declval<T>().cbegin()),
                                       decltype(std::declval<T>().cend()),
                                       decltype(std::declval<T>().max_size()),
                                       decltype(std::declval<T>().empty())>> : std::true_type
    {
    };

    template<typename T>
    constexpr bool is_container_v = is_container<T>::value;
}   // namespace CppUtils::Meta
 
#endif