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