mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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57 lines
1.8 KiB
C++
57 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_UTILITY_FORWARD_HPP
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#define SPROUT_UTILITY_FORWARD_HPP
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/preprocessor/config.hpp>
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#include <sprout/preprocessor/cat.hpp>
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#include <sprout/preprocessor/variadic/size.hpp>
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namespace sprout {
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//
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// forward
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//
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template<typename T>
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inline SPROUT_CONSTEXPR T&&
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forward(typename std::remove_reference<T>::type& t) SPROUT_NOEXCEPT {
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return static_cast<T&&>(t);
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}
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template<typename T>
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inline SPROUT_CONSTEXPR T&&
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forward(typename std::remove_reference<T>::type&&) SPROUT_NOEXCEPT SPROUT_DELETED_FUNCTION_DECL
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} // namespace sprout
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#if defined(__INTEL_COMPILER) || defined(__ICL) || defined(__ICC) || defined(__ECC)
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# define SPROUT_FORWARD_2(TYPE, VAR) \
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static_cast<decltype(::sprout::forward<TYPE>(VAR))>(VAR)
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#else
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# define SPROUT_FORWARD_2(TYPE, VAR) \
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::sprout::forward<TYPE>(VAR)
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#endif
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//
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// SPROUT_AUTO_FORWARD
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//
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#define SPROUT_AUTO_FORWARD(VAR) SPROUT_FORWARD_2(decltype(VAR), VAR)
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//
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// SPROUT_FORWARD
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//
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#if SPROUT_PP_VARIADICS && !defined(_MSC_VER)
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# define SPROUT_FORWARD_1(VAR) \
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SPROUT_AUTO_FORWARD(VAR)
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# define SPROUT_FORWARD(...) \
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SPROUT_PP_CAT(SPROUT_FORWARD_, SPROUT_PP_VARIADIC_SIZE(__VA_ARGS__))(__VA_ARGS__)
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#else
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# define SPROUT_FORWARD(TYPE, VAR) \
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SPROUT_FORWARD_2(TYPE, VAR)
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#endif
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#endif // #ifndef SPROUT_UTILITY_FORWARD_HPP
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