mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-11-14 10:39:05 +00:00
201 lines
7.5 KiB
C++
201 lines
7.5 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2014 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_GENERATOR_ACCESS_TRAITS_HPP
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#define SPROUT_GENERATOR_GENERATOR_ACCESS_TRAITS_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/tuple/tuple.hpp>
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#include <sprout/type_traits/identity.hpp>
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#include <sprout/type_traits/integral_constant.hpp>
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namespace sprout {
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namespace generators {
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namespace detail {
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template<typename T>
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struct has_mem_generated_value_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>().generated_value())>::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)
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template<typename T, typename Base_ = typename sprout::identity<decltype(sprout::generators::detail::has_mem_generated_value_test<T>::test(0))>::type>
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struct has_mem_generated_value
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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_generated_value
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: public sprout::identity<decltype(sprout::generators::detail::has_mem_generated_value_test<T>::test(0))>::type
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{};
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#endif
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template<typename Gen, typename = void>
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struct generator_access_traits_generated_value_impl;
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template<typename Gen>
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struct generator_access_traits_generated_value_impl<
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Gen,
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typename std::enable_if<sprout::generators::detail::has_mem_generated_value<Gen>::value>::type
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> {
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public:
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static SPROUT_CONSTEXPR decltype(std::declval<Gen&>().generated_value())
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get_generated_value(Gen& t)
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SPROUT_NOEXCEPT_IF_EXPR(std::declval<Gen&>().generated_value())
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{
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return t.generated_value();
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}
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static SPROUT_CONSTEXPR decltype(std::declval<Gen&&>().generated_value())
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get_generated_value(Gen&& t)
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SPROUT_NOEXCEPT_IF_EXPR(std::declval<Gen&&>().generated_value())
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{
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return t.generated_value();
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}
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static SPROUT_CONSTEXPR decltype(std::declval<Gen const&>().generated_value())
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get_generated_value(Gen const& t)
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SPROUT_NOEXCEPT_IF_EXPR(std::declval<Gen const&>().generated_value())
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{
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return t.generated_value();
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}
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};
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template<typename Gen>
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struct generator_access_traits_generated_value_impl<
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Gen,
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typename std::enable_if<!sprout::generators::detail::has_mem_generated_value<Gen>::value>::type
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> {
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public:
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static SPROUT_CONSTEXPR decltype(sprout::tuples::get<0>(std::declval<Gen&>()))
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get_generated_value(Gen& t)
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SPROUT_NOEXCEPT_IF_EXPR(sprout::tuples::get<0>(std::declval<Gen&>()))
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{
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return sprout::tuples::get<0>(t);
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}
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static SPROUT_CONSTEXPR decltype(sprout::tuples::get<0>(std::declval<Gen&&>()))
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get_generated_value(Gen&& t)
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SPROUT_NOEXCEPT_IF_EXPR(sprout::tuples::get<0>(std::declval<Gen&>()))
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{
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return sprout::tuples::get<0>(t);
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}
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static SPROUT_CONSTEXPR decltype(sprout::tuples::get<0>(std::declval<Gen const&>()))
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get_generated_value(Gen const& t)
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SPROUT_NOEXCEPT_IF_EXPR(sprout::tuples::get<0>(std::declval<Gen const&>()))
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{
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return sprout::tuples::get<0>(t);
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}
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};
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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)
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template<typename T, typename Base_ = typename sprout::identity<decltype(sprout::generators::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::generators::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 Gen, typename = void>
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struct generator_access_traits_next_generator_impl;
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template<typename Gen>
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struct generator_access_traits_next_generator_impl<
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Gen,
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typename std::enable_if<sprout::generators::detail::has_mem_next_generator<Gen>::value>::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& t)
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SPROUT_NOEXCEPT_IF_EXPR(std::declval<Gen&>().next_generator())
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{
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return t.next_generator();
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}
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static SPROUT_CONSTEXPR decltype(std::declval<Gen&&>().next_generator())
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get_next_generator(Gen&& t)
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SPROUT_NOEXCEPT_IF_EXPR(std::declval<Gen&&>().next_generator())
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{
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return t.next_generator();
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}
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static SPROUT_CONSTEXPR decltype(std::declval<Gen const&>().next_generator())
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get_next_generator(Gen const& t)
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SPROUT_NOEXCEPT_IF_EXPR(std::declval<Gen const&>().next_generator())
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{
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return t.next_generator();
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}
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};
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template<typename Gen>
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struct generator_access_traits_next_generator_impl<
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Gen,
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typename std::enable_if<!sprout::generators::detail::has_mem_next_generator<Gen>::value>::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& t)
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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>(t);
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}
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static SPROUT_CONSTEXPR decltype(sprout::tuples::get<1>(std::declval<Gen&&>()))
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get_next_generator(Gen&& t)
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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>(t);
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}
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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& t)
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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>(t);
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}
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};
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} // namespace detail
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//
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// generator_access_traits
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//
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template<typename Gen>
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struct generator_access_traits
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: public sprout::generators::detail::generator_access_traits_generated_value_impl<Gen>
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, public sprout::generators::detail::generator_access_traits_next_generator_impl<Gen>
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{};
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template<typename Gen>
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struct generator_access_traits<Gen const> {
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public:
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static SPROUT_CONSTEXPR decltype(sprout::generators::generator_access_traits<Gen>::get_generated_value(std::declval<Gen const&>()))
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get_generated_value(Gen const& t)
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SPROUT_NOEXCEPT_IF_EXPR(sprout::generators::generator_access_traits<Gen>::get_generated_value(std::declval<Gen const&>()))
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{
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return sprout::generators::generator_access_traits<Gen>::get_generated_value(t);
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}
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static SPROUT_CONSTEXPR decltype(sprout::generators::generator_access_traits<Gen>::get_next_generator(std::declval<Gen const&>()))
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get_next_generator(Gen const& t)
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SPROUT_NOEXCEPT_IF_EXPR(sprout::generators::generator_access_traits<Gen>::get_next_generator(std::declval<Gen const&>()))
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{
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return sprout::generators::generator_access_traits<Gen>::get_next_generator(t);
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}
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};
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} // namespace generators
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using sprout::generators::generator_access_traits;
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} // namespace sprout
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#endif // #ifndef SPROUT_GENERATOR_GENERATOR_ACCESS_TRAITS_HPP
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