mirror of
https://github.com/bolero-MURAKAMI/Sprout
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42 lines
1.8 KiB
C++
42 lines
1.8 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2017 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_VALUE_HPP
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#define SPROUT_GENERATOR_NEXT_VALUE_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_generate_traits.hpp>
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namespace sprout {
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namespace generators {
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//
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// next_value
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//
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// effect:
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// sprout::generators::generator_generate_traits<T>::generate_next_value(t)
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// [default]
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// ADL callable generate_next_value(t) -> generate_next_value(t)
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// [default]
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// otherwise, callable t.next_value() -> t.next_value()
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// otherwise, T is InputIterator -> sprout::next(t)
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// otherwise, callable t() -> t()
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// otherwise -> sprout::generators::next_value(sprout::generators::next_generator(t))
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//
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template<typename T>
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inline SPROUT_CONSTEXPR decltype(sprout::generators::generator_generate_traits<typename std::remove_reference<T>::type>::generate_next_value(std::declval<T>()))
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next_value(T&& t)
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SPROUT_NOEXCEPT_IF_EXPR(sprout::generators::generator_generate_traits<typename std::remove_reference<T>::type>::generate_next_value(std::declval<T>()))
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{
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return sprout::generators::generator_generate_traits<typename std::remove_reference<T>::type>::generate_next_value(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_VALUE_HPP
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