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decay.hpp
/*============================================================================= Copyright (c) 2015 Paul Fultz II decay.h Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) ==============================================================================*/ #ifndef BOOST_HOF_GUARD_DECAY_H #define BOOST_HOF_GUARD_DECAY_H /// decay /// ===== /// /// Description /// ----------- /// /// The `decay` function is a unary function object that returns whats given to it after decaying its type. /// /// Synopsis /// -------- /// /// struct /// { /// template<class T> /// constexpr typename decay<T>::type operator()(T&& x) const /// { /// return boost::hof::forward<T>(x); /// } /// } decay; /// /// References /// ---------- /// /// * [n3255](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3255.html) - Proposal for `decay_copy` /// #include <boost/hof/detail/delegate.hpp> #include <boost/hof/detail/unwrap.hpp> #include <boost/hof/detail/static_const_var.hpp> #include <boost/hof/detail/forward.hpp> namespace boost { namespace hof { namespace detail { template<class T> struct decay_mf : unwrap_reference<typename std::decay<T>::type> {}; struct decay_f { template< class T, class Result=typename unwrap_reference<typename std::decay<T>::type>::type, class=typename std::enable_if<(BOOST_HOF_IS_CONSTRUCTIBLE(Result, T))>::type > constexpr Result operator()(T&& x) const BOOST_HOF_NOEXCEPT_CONSTRUCTIBLE(Result, T&&) { return BOOST_HOF_FORWARD(T)(x); } }; } BOOST_HOF_DECLARE_STATIC_VAR(decay, detail::decay_f); }} // namespace boost::hof #endif