mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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199 lines
7 KiB
C++
199 lines
7 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_BEGIN_HPP
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#define SPROUT_CONTAINER_DETAIL_RANGE_BEGIN_HPP
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#include <iterator>
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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/type_traits/is_within_namespace_sprout.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/iterator/const_iterator_cast.hpp>
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#include <sprout/utility/as_const.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 begin(...);
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sprout::not_found_via_adl range_begin(...);
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} // namespace sprout_adl
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namespace sprout_container_range_detail {
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using sprout_adl::begin;
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template<typename T>
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struct has_adl_begin_test {
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public:
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template<
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typename U = T,
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typename R = typename sprout::identity<decltype(begin(std::declval<U>()))>::type
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>
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static sprout::is_found_via_adl<R> test(int);
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static sprout::false_type test(...);
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};
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template<typename Container>
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inline SPROUT_CONSTEXPR typename sprout::container_traits<Container>::iterator
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range_adl_begin(Container& cont) {
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return begin(cont);
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}
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template<typename Container>
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inline SPROUT_CONSTEXPR typename sprout::container_traits<Container const>::iterator
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range_adl_begin(Container const& cont) {
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return begin(cont);
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}
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} // namespace sprout_container_range_detail
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namespace sprout {
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namespace detail {
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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_container_range_detail::has_adl_begin_test<T>::test(0))>::type>
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struct has_adl_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_adl_begin
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: public sprout::identity<decltype(sprout_container_range_detail::has_adl_begin_test<T>::test(0))>::type
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{};
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#endif
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template<typename T, bool = sprout::is_within_namespace_sprout<T>::value>
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struct has_adl_begin_without_sprout
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: public sprout::false_type
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{};
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template<typename T>
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struct has_adl_begin_without_sprout<T, false>
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: public sprout::detail::has_adl_begin<T>
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{};
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template<typename T>
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struct has_mem_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(std::declval<U>().begin())>::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_begin_test<T>::test(0))>::type>
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struct has_mem_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_mem_begin
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: public sprout::identity<decltype(sprout::detail::has_mem_begin_test<T>::test(0))>::type
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{};
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#endif
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template<typename T>
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struct is_substitutable_const_begin
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: public sprout::bool_constant<
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sprout::is_const_iterator_cast_convertible<
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typename sprout::container_traits<T const>::iterator,
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typename sprout::container_traits<T>::iterator
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>::value
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&& (
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sprout::detail::has_mem_begin<T const>::value
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|| sprout::detail::has_adl_begin_without_sprout<T const&>::value
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)
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>
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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::is_substitutable_const_begin<Container>::value,
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typename sprout::container_traits<Container>::iterator
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>::type
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range_begin_impl(Container& cont) {
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typedef typename sprout::container_traits<Container>::iterator type;
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return sprout::const_iterator_cast<type>(sprout::begin(sprout::as_const(cont)));
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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::is_substitutable_const_begin<Container>::value
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&& sprout::detail::has_mem_begin<Container>::value
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,
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typename sprout::container_traits<Container>::iterator
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>::type
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range_begin_impl(Container& cont) {
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return cont.begin();
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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::is_substitutable_const_begin<Container>::value
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&& !sprout::detail::has_mem_begin<Container>::value
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&& sprout::detail::has_adl_begin_without_sprout<Container&>::value
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,
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typename sprout::container_traits<Container>::iterator
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>::type
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range_begin_impl(Container& cont) {
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return sprout_container_range_detail::range_adl_begin(cont);
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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::is_substitutable_const_begin<Container>::value
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&& !sprout::detail::has_mem_begin<Container>::value
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&& !sprout::detail::has_adl_begin_without_sprout<Container&>::value
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,
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typename sprout::container_traits<Container>::iterator
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>::type
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range_begin_impl(Container& cont) {
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return std::begin(cont);
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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_begin<Container const>::value,
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typename sprout::container_traits<Container const>::iterator
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>::type
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range_begin_impl(Container const& cont) {
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return cont.begin();
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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_begin<Container const>::value
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&& sprout::detail::has_adl_begin_without_sprout<Container const&>::value
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,
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typename sprout::container_traits<Container const>::iterator
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>::type
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range_begin_impl(Container const& cont) {
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return sprout_container_range_detail::range_adl_begin(cont);
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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_begin<Container const>::value
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&& !sprout::detail::has_adl_begin_without_sprout<Container const&>::value
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,
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typename sprout::container_traits<Container const>::iterator
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>::type
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range_begin_impl(Container const& cont) {
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return std::begin(cont);
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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 typename sprout::container_traits<Container>::iterator
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range_begin(Container& cont) {
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return sprout::detail::range_begin_impl(cont);
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}
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template<typename Container>
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inline SPROUT_CONSTEXPR typename sprout::container_traits<Container const>::iterator
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range_begin(Container const& cont) {
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return sprout::detail::range_begin_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_BEGIN_HPP
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