mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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76 lines
2.5 KiB
C++
76 lines
2.5 KiB
C++
/*=============================================================================
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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_DETAIL_RANGE_EMPTY_HPP
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#define SPROUT_CONTAINER_DETAIL_RANGE_EMPTY_HPP
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#include <utility>
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#include <type_traits>
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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/traits_fwd.hpp>
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#include <sprout/container/container_traits.hpp>
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#include <sprout/container/range_functions_fwd.hpp>
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#include <sprout/adl/not_found.hpp>
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namespace sprout_adl {
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sprout::not_found_via_adl range_empty(...);
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} // namespace sprout_adl
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namespace sprout {
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namespace detail {
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template<typename T>
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struct has_mem_empty_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(std::declval<U>().empty())>::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_mem_empty_test<T>::test(0))>::type>
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struct has_mem_empty
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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_mem_empty
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: public sprout::identity<decltype(sprout::detail::has_mem_empty_test<T>::test(0))>::type
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{};
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#endif
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template<typename Container>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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sprout::detail::has_mem_empty<Container const>::value,
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bool
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>::type
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range_empty_impl(Container const& cont) {
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return cont.empty();
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}
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template<typename Container>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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!sprout::detail::has_mem_empty<Container const>::value,
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bool
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>::type
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range_empty_impl(Container const& cont) {
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return sprout::size(cont) == 0;
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}
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} // namespace detail
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} // namespace sprout
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namespace sprout_container_range_detail {
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template<typename Container>
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inline SPROUT_CONSTEXPR bool
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range_empty(Container const& cont) {
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return sprout::detail::range_empty_impl(cont);
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}
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} // namespace sprout_container_range_detail
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#endif // #ifndef SPROUT_CONTAINER_DETAIL_RANGE_EMPTY_HPP
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