| 1 | // add_rvalue_reference.hpp ---------------------------------------------------------// |
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| 2 | |
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| 3 | // Copyright 2010 Vicente J. Botet Escriba |
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| 4 | |
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| 5 | // Distributed under the Boost Software License, Version 1.0. |
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| 6 | // See http://www.boost.org/LICENSE_1_0.txt |
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| 7 | |
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| 8 | #ifndef BOOST_TYPE_TRAITS_EXT_ADD_RVALUE_REFERENCE__HPP |
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| 9 | #define BOOST_TYPE_TRAITS_EXT_ADD_RVALUE_REFERENCE__HPP |
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| 10 | |
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| 11 | #include <boost/config.hpp> |
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| 12 | |
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| 13 | //----------------------------------------------------------------------------// |
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| 14 | |
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| 15 | #include <boost/type_traits/is_void.hpp> |
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| 16 | #include <boost/type_traits/is_reference.hpp> |
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| 17 | |
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| 18 | //----------------------------------------------------------------------------// |
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| 19 | // // |
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| 20 | // C++03 implementation of // |
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| 21 | // 20.9.7.2 Reference modifications [meta.trans.ref] // |
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| 22 | // Written by Vicente J. Botet Escriba // |
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| 23 | // // |
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| 24 | // If T names an object or function type then the member typedef type |
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| 25 | // shall name T&&; otherwise, type shall name T. [ Note: This rule reflects |
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| 26 | // the semantics of reference collapsing. For example, when a type T names |
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| 27 | // a type T1&, the type add_rvalue_reference<T>::type is not an rvalue |
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| 28 | // reference. -end note ] |
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| 29 | //----------------------------------------------------------------------------// |
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| 30 | |
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| 31 | namespace boost { |
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| 32 | |
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| 33 | namespace type_traits_detail { |
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| 34 | |
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| 35 | template <typename T, bool b> |
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| 36 | struct add_rvalue_reference_helper |
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| 37 | { typedef T type; }; |
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| 38 | |
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| 39 | #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) |
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| 40 | template <typename T> |
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| 41 | struct add_rvalue_reference_helper<T, true> |
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| 42 | { |
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| 43 | typedef T&& type; |
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| 44 | }; |
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| 45 | #endif |
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| 46 | |
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| 47 | template <typename T> |
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| 48 | struct add_rvalue_reference_imp |
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| 49 | { |
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| 50 | typedef typename boost::type_traits_detail::add_rvalue_reference_helper |
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| 51 | <T, (is_void<T>::value == false && is_reference<T>::value == false) >::type type; |
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| 52 | }; |
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| 53 | |
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| 54 | } |
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| 55 | |
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| 56 | template <class T> struct add_rvalue_reference |
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| 57 | { |
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| 58 | typedef typename boost::type_traits_detail::add_rvalue_reference_imp<T>::type type; |
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| 59 | }; |
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| 60 | |
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| 61 | #if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES) |
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| 62 | |
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| 63 | template <class T> using add_rvalue_reference_t = typename add_rvalue_reference<T>::type; |
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| 64 | |
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| 65 | #endif |
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| 66 | |
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| 67 | } // namespace boost |
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| 68 | |
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| 69 | #endif // BOOST_TYPE_TRAITS_EXT_ADD_RVALUE_REFERENCE__HPP |
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| 70 | |
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| 71 | |
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