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44 lines
1.9 KiB
C++
44 lines
1.9 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_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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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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// sprout::generators::generator_access_traits<T>::get_next_generator(t)
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// [default]
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// ADL callable get_next_generator(t) -> get_next_generator(t)
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// [default]
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// T is not const
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// && callable sprout::as_const(t).next_generator()
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// -> sprout::const_reference_cast<decltype(std::declval<T&>().next_generator())>(sprout::as_const(cont).next_generator())
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// otherwise, callable t.next_generator() -> t.next_generator()
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// otherwise, T is InputIterator -> t
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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::generators::generator_access_traits<typename std::remove_reference<T>::type>::get_next_generator(std::declval<T>()))
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next_generator(T&& t)
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SPROUT_NOEXCEPT_IF_EXPR(sprout::generators::generator_access_traits<typename std::remove_reference<T>::type>::get_next_generator(std::declval<T>()))
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{
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return sprout::generators::generator_access_traits<typename std::remove_reference<T>::type>::get_next_generator(SPROUT_FORWARD(T, t));
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}
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} // namespace generators
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} // namespace sprout
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#endif // #ifndef SPROUT_GENERATOR_NEXT_GENERATOR_HPP
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