mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-11-29 01:03:45 +00:00
227 lines
8.3 KiB
C++
227 lines
8.3 KiB
C++
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/*=============================================================================
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Copyright (c) 2011-2016 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_GENERATOR_DETAIL_NEXT_GENERATOR_HPP
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#define SPROUT_GENERATOR_DETAIL_NEXT_GENERATOR_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/iterator/const_reference_cast.hpp>
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#include <sprout/utility/as_const.hpp>
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#include <sprout/utility/move.hpp>
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#include <sprout/tuple/tuple.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 get_next_generator(...);
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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_next_generator_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>().next_generator())>::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_next_generator_test<T>::test(0))>::type>
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struct has_mem_next_generator
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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_next_generator
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: public sprout::identity<decltype(sprout::detail::has_mem_next_generator_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_next_generator
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: public sprout::bool_constant<
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sprout::detail::has_mem_next_generator<T const>::value
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>
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{};
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template<typename Gen, typename = void>
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struct get_next_generator_impl;
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template<typename Gen>
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struct get_next_generator_impl<
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Gen,
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typename std::enable_if<
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std::is_lvalue_reference<Gen>::value && !std::is_const<typename std::remove_reference<Gen>::type>::value
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&& sprout::detail::is_substitutable_const_next_generator<Gen>::value
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>::type
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> {
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public:
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static SPROUT_CONSTEXPR decltype(std::declval<Gen&>().next_generator())
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get_next_generator(Gen& gen)
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SPROUT_NOEXCEPT_IF_EXPR(std::declval<Gen&>().next_generator())
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{
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typedef decltype(std::declval<Gen&>().next_generator()) type;
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return sprout::const_reference_cast<type>(sprout::as_const(gen).next_generator());
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}
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};
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template<typename Gen>
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struct get_next_generator_impl<
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Gen,
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typename std::enable_if<
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std::is_lvalue_reference<Gen>::value && !std::is_const<typename std::remove_reference<Gen>::type>::value
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&& !sprout::detail::is_substitutable_const_next_generator<Gen>::value
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&& sprout::detail::has_mem_next_generator<Gen>::value
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>::type
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> {
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public:
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static SPROUT_CONSTEXPR decltype(std::declval<Gen&>().next_generator())
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get_next_generator(Gen& gen)
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SPROUT_NOEXCEPT_IF_EXPR(std::declval<Gen&>().next_generator())
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{
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return gen.next_generator();
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}
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};
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template<typename Gen>
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struct get_next_generator_impl<
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Gen,
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typename std::enable_if<
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std::is_lvalue_reference<Gen>::value && !std::is_const<typename std::remove_reference<Gen>::type>::value
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&& !sprout::detail::is_substitutable_const_next_generator<Gen>::value
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&& !sprout::detail::has_mem_next_generator<Gen>::value
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>::type
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> {
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public:
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static SPROUT_CONSTEXPR decltype(sprout::tuples::get<1>(std::declval<Gen&>()))
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get_next_generator(Gen& gen)
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SPROUT_NOEXCEPT_IF_EXPR(sprout::tuples::get<1>(std::declval<Gen&>()))
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{
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return sprout::tuples::get<1>(gen);
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}
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};
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template<typename Gen>
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struct get_next_generator_impl<
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Gen,
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typename std::enable_if<
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std::is_rvalue_reference<Gen>::value && !std::is_const<typename std::remove_reference<Gen>::type>::value
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&& sprout::detail::is_substitutable_const_next_generator<Gen>::value
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>::type
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> {
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public:
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static SPROUT_CONSTEXPR decltype(std::declval<Gen&&>().next_generator())
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get_next_generator(Gen&& gen)
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SPROUT_NOEXCEPT_IF_EXPR(std::declval<Gen&&>().next_generator())
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{
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typedef decltype(std::declval<Gen&&>().next_generator()) type;
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return sprout::const_reference_cast<type>(sprout::as_const(sprout::move(gen)).next_generator());
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}
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};
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template<typename Gen>
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struct get_next_generator_impl<
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Gen,
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typename std::enable_if<
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std::is_rvalue_reference<Gen>::value && !std::is_const<typename std::remove_reference<Gen>::type>::value
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&& !sprout::detail::is_substitutable_const_next_generator<Gen>::value
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&& sprout::detail::has_mem_next_generator<Gen>::value
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>::type
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> {
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public:
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static SPROUT_CONSTEXPR decltype(std::declval<Gen&&>().next_generator())
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get_next_generator(Gen&& gen)
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SPROUT_NOEXCEPT_IF_EXPR(std::declval<Gen&&>().next_generator())
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{
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return sprout::move(gen).next_generator();
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}
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};
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template<typename Gen>
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struct get_next_generator_impl<
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Gen,
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typename std::enable_if<
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std::is_rvalue_reference<Gen>::value && !std::is_const<typename std::remove_reference<Gen>::type>::value
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&& !sprout::detail::is_substitutable_const_next_generator<Gen>::value
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&& !sprout::detail::has_mem_next_generator<Gen>::value
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>::type
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> {
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public:
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static SPROUT_CONSTEXPR decltype(sprout::tuples::get<1>(std::declval<Gen&&>()))
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get_next_generator(Gen&& gen)
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SPROUT_NOEXCEPT_IF_EXPR(sprout::tuples::get<1>(std::declval<Gen&&>()))
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{
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return sprout::tuples::get<1>(sprout::move(gen));
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}
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};
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template<typename Gen>
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struct get_next_generator_impl<
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Gen,
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typename std::enable_if<
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std::is_reference<Gen>::value && std::is_const<typename std::remove_reference<Gen>::type>::value
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&& sprout::detail::has_mem_next_generator<Gen const>::value
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>::type
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> {
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public:
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static SPROUT_CONSTEXPR decltype(std::declval<Gen const&>().next_generator())
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get_next_generator(Gen const& gen)
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SPROUT_NOEXCEPT_IF_EXPR(std::declval<Gen const&>().next_generator())
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{
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return gen.next_generator();
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}
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};
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template<typename Gen>
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struct get_next_generator_impl<
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Gen,
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typename std::enable_if<
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std::is_reference<Gen>::value && std::is_const<typename std::remove_reference<Gen>::type>::value
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&& !sprout::detail::has_mem_next_generator<Gen const>::value
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>::type
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> {
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public:
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static SPROUT_CONSTEXPR decltype(sprout::tuples::get<1>(std::declval<Gen const&>()))
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get_next_generator(Gen const& gen)
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SPROUT_NOEXCEPT_IF_EXPR(sprout::tuples::get<1>(std::declval<Gen const&>()))
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{
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return sprout::tuples::get<1>(gen);
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}
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};
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} // namespace detail
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} // namespace sprout
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namespace sprout_generator_detail {
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template<typename Gen>
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inline SPROUT_CONSTEXPR decltype(sprout::detail::get_next_generator_impl<Gen&>::get_next_generator(std::declval<Gen&>()))
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get_next_generator(Gen& gen)
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SPROUT_NOEXCEPT_IF_EXPR(sprout::detail::get_next_generator_impl<Gen&>::get_next_generator(std::declval<Gen&>()))
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{
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return sprout::detail::get_next_generator_impl<Gen&>::get_next_generator(gen);
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}
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template<typename Gen>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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!std::is_const<Gen>::value && !std::is_volatile<Gen>::value && !std::is_reference<Gen>::value,
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decltype(sprout::detail::get_next_generator_impl<Gen&&>::get_next_generator(std::declval<Gen&&>()))
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>::type
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get_next_generator(Gen&& gen)
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SPROUT_NOEXCEPT_IF_EXPR(sprout::detail::get_next_generator_impl<Gen&&>::get_next_generator(std::declval<Gen&&>()))
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{
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return sprout::detail::get_next_generator_impl<Gen&&>::get_next_generator(sprout::move(gen));
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}
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template<typename Gen>
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inline SPROUT_CONSTEXPR decltype(sprout::detail::get_next_generator_impl<Gen const&>::get_next_generator(std::declval<Gen const&>()))
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get_next_generator(Gen const& gen)
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SPROUT_NOEXCEPT_IF_EXPR(sprout::detail::get_next_generator_impl<Gen const&>::get_next_generator(std::declval<Gen const&>()))
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{
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return sprout::detail::get_next_generator_impl<Gen const&>::get_next_generator(gen);
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}
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} // namespace sprout_generator_detail
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#endif // #ifndef SPROUT_GENERATOR_DETAIL_NEXT_GENERATOR_HPP
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