mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
100 lines
4.1 KiB
C++
100 lines
4.1 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2015 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_NEXT_GENERATOR_HPP
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#define SPROUT_GENERATOR_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/utility/forward.hpp>
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#include <sprout/generator/generator_access_traits.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_generator_detail {
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using sprout_adl::get_next_generator;
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template<typename Gen>
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inline SPROUT_CONSTEXPR decltype(sprout::generators::generator_access_traits<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::generators::generator_access_traits<Gen>::get_next_generator(std::declval<Gen&>()))
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{
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return sprout::generators::generator_access_traits<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::generators::generator_access_traits<typename std::remove_reference<Gen>::type>::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::generators::generator_access_traits<typename std::remove_reference<Gen>::type>::get_next_generator(std::declval<Gen&&>()))
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{
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return sprout::generators::generator_access_traits<Gen>::get_next_generator(gen);
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}
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template<typename Gen>
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inline SPROUT_CONSTEXPR decltype(sprout::generators::generator_access_traits<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::generators::generator_access_traits<Gen const>::get_next_generator(std::declval<Gen const&>()))
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{
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return sprout::generators::generator_access_traits<Gen const>::get_next_generator(gen);
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}
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template<typename Gen>
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inline SPROUT_CONSTEXPR decltype(get_next_generator(std::declval<Gen&>()))
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call_get_next_generator(Gen& gen)
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SPROUT_NOEXCEPT_IF_EXPR(get_next_generator(std::declval<Gen&>()))
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{
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return 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(get_next_generator(std::declval<Gen&&>()))
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>::type
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call_get_next_generator(Gen&& gen)
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SPROUT_NOEXCEPT_IF_EXPR(get_next_generator(std::declval<Gen&&>()))
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{
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return get_next_generator(gen);
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}
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template<typename Gen>
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inline SPROUT_CONSTEXPR decltype(get_next_generator(std::declval<Gen const&>()))
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call_get_next_generator(Gen const& gen)
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SPROUT_NOEXCEPT_IF_EXPR(get_next_generator(std::declval<Gen const&>()))
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{
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return get_next_generator(gen);
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}
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} // namespace sprout_generator_detail
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namespace sprout {
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namespace generators {
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//
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// next_generator
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//
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// effect:
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// ADL callable get_next_generator(t) -> get_next_generator(t)
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// otherwise -> sprout::generators::generator_access_traits<T>::get_next_generator(t)
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// [default]
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// member callable t.next_generator() -> t.next_generator()
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// otherwise -> sprout::tuples::get<0>(t)
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//
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template<typename T>
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inline SPROUT_CONSTEXPR decltype(sprout_generator_detail::call_get_next_generator(std::declval<T>()))
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next_generator(T&& t)
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SPROUT_NOEXCEPT_IF_EXPR(sprout_generator_detail::call_get_next_generator(std::declval<T>()))
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{
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return sprout_generator_detail::call_get_next_generator(SPROUT_FORWARD(T, t));
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}
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} // namespace generators
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using sprout::generators::next_generator;
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} // namespace sprout
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#endif // #ifndef SPROUT_GENERATOR_NEXT_GENERATOR_HPP
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