| 1 | /*============================================================================= |
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| 2 | Copyright (c) 2014 Paul Fultz II |
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| 3 | forward.h |
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| 4 | Distributed under the Boost Software License, Version 1.0. (See accompanying |
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| 5 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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| 6 | ==============================================================================*/ |
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| 7 | |
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| 8 | #ifndef BOOST_HOF_GUARD_FORWARD_H |
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| 9 | #define BOOST_HOF_GUARD_FORWARD_H |
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| 10 | |
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| 11 | #include <utility> |
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| 12 | |
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| 13 | namespace boost { namespace hof { |
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| 14 | |
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| 15 | // contexpr-friendly forwarding |
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| 16 | |
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| 17 | template<typename T> |
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| 18 | constexpr T&& forward(typename std::remove_reference<T>::type& t) noexcept |
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| 19 | { return static_cast<T&&>(t); } |
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| 20 | |
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| 21 | |
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| 22 | template<typename T> |
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| 23 | constexpr T&& forward(typename std::remove_reference<T>::type&& t) noexcept |
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| 24 | { |
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| 25 | static_assert(!std::is_lvalue_reference<T>::value, "T must not be an lvalue reference type" ); |
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| 26 | return static_cast<T&&>(t); |
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| 27 | } |
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| 28 | |
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| 29 | #if (defined(__GNUC__) && !defined (__clang__) && __GNUC__ == 4 && __GNUC_MINOR__ < 7) || defined(_MSC_VER) |
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| 30 | #define BOOST_HOF_FORWARD(...) boost::hof::forward<__VA_ARGS__> |
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| 31 | #else |
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| 32 | #define BOOST_HOF_FORWARD(...) static_cast<__VA_ARGS__ &&> |
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| 33 | #endif |
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| 34 | |
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| 35 | }} // namespace boost::hof |
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| 36 | |
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| 37 | #endif |
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| 38 | |
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