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/*============================================================================= Copyright (c) 2014 Paul Fultz II forward.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_FORWARD_H #define BOOST_HOF_GUARD_FORWARD_H #include <utility> namespace boost { namespace hof { // contexpr-friendly forwarding template<typename T> constexpr T&& forward(typename std::remove_reference<T>::type& t) noexcept { return static_cast<T&&>(t); } template<typename T> constexpr T&& forward(typename std::remove_reference<T>::type&& t) noexcept { static_assert(!std::is_lvalue_reference<T>::value, "T must not be an lvalue reference type"); return static_cast<T&&>(t); } #if (defined(__GNUC__) && !defined (__clang__) && __GNUC__ == 4 && __GNUC_MINOR__ < 7) || defined(_MSC_VER) #define BOOST_HOF_FORWARD(...) boost::hof::forward<__VA_ARGS__> #else #define BOOST_HOF_FORWARD(...) static_cast<__VA_ARGS__ &&> #endif }} // namespace boost::hof #endif
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