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https://github.com/bolero-MURAKAMI/Sprout.git
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57 lines
1.8 KiB
C++
57 lines
1.8 KiB
C++
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/*=============================================================================
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Copyright (c) 2011-2019 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_CONTAINER_HAS_SPROUT_BEGIN_HPP
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#define SPROUT_CONTAINER_HAS_SPROUT_BEGIN_HPP
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#include <utility>
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#include <sprout/config.hpp>
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#include <sprout/type_traits/integral_constant.hpp>
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#include <sprout/type_traits/identity.hpp>
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#include <sprout/container/begin.hpp>
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namespace sprout {
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//
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// has_sprout_begin
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//
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namespace detail {
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template<typename T>
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struct has_sprout_begin_test {
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public:
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template<
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typename U = T,
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typename = typename sprout::identity<decltype(sprout::begin(std::declval<U>()))>::type
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>
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static sprout::true_type test(int);
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static sprout::false_type test(...);
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};
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#if defined(_MSC_VER) && (_MSC_VER > 1900)
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template<typename T, typename Base_ = typename sprout::identity<decltype(sprout::detail::has_sprout_begin_test<T>::test(0))>::type>
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struct has_sprout_begin
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: public Base_
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{};
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#else
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template<typename T>
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struct has_sprout_begin
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: public sprout::identity<decltype(sprout::detail::has_sprout_begin_test<T>::test(0))>::type
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{};
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#endif
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} // namespace detail
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template<typename T>
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struct has_sprout_begin
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: public sprout::detail::has_sprout_begin<T>
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{};
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#if SPROUT_USE_VARIABLE_TEMPLATES
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template<typename T>
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SPROUT_STATIC_CONSTEXPR bool has_sprout_begin_v = sprout::has_sprout_begin<T>::value;
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#endif // #if SPROUT_USE_VARIABLE_TEMPLATES
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} // namespace sprout
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#endif // #ifndef SPROUT_CONTAINER_HAS_SPROUT_BEGIN_HPP
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