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77 lines
2.9 KiB
C++
77 lines
2.9 KiB
C++
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/*
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/~` _ _ _|_. _ _ |_ | _
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\_,(_)| | | || ||_|(_||_)|(/_
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https://github.com/Naios/continuable
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v3.0.0
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Copyright(c) 2015 - 2018 Denis Blank <denis.blank at outlook dot com>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files(the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions :
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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**/
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#ifndef CONTINUABLE_DETAIL_CONTAINER_CATEGORY_HPP_INCLUDED
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#define CONTINUABLE_DETAIL_CONTAINER_CATEGORY_HPP_INCLUDED
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#include <tuple>
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#include <type_traits>
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#include <continuable/detail/utility/traits.hpp>
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namespace cti {
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namespace detail {
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namespace traversal {
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/// Deduces to a true type if the given parameter T
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/// has a begin() and end() method.
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// TODO Find out whether we should use std::begin and std::end instead, which
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// could cause issues with plain arrays.
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template <typename T, typename = void>
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struct is_range : std::false_type {};
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template <typename T>
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struct is_range<T, traits::void_t<decltype(std::declval<T>().begin() ==
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std::declval<T>().end())>>
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: std::true_type {};
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/// Deduces to a true type if the given parameter T
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/// is accessible through std::tuple_size.
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template <typename T, typename = void>
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struct is_tuple_like : std::false_type {};
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template <typename T>
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struct is_tuple_like<T, traits::void_t<decltype(std::tuple_size<T>::value)>>
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: std::true_type {};
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/// A tag for dispatching based on the tuple like
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/// or container properties of a type.
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///
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/// This type deduces to a true_type if it has any category.
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template <bool IsContainer, bool IsTupleLike>
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struct container_category_tag
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: std::integral_constant<bool, IsContainer || IsTupleLike> {};
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/// Deduces to the container_category_tag of the given type T.
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template <typename T>
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using container_category_of_t =
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container_category_tag<is_range<T>::value, is_tuple_like<T>::value>;
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} // namespace traversal
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} // namespace detail
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} // namespace cti
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#endif // CONTINUABLE_DETAIL_CONTAINER_CATEGORY_HPP_INCLUDED
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