| // add_rvalue_reference.hpp ---------------------------------------------------------// | |
| // Copyright 2010 Vicente J. Botet Escriba | |
| // Distributed under the Boost Software License, Version 1.0. | |
| // See http://www.boost.org/LICENSE_1_0.txt | |
| #ifndef BOOST_TYPE_TRAITS_EXT_ADD_RVALUE_REFERENCE__HPP | |
| #define BOOST_TYPE_TRAITS_EXT_ADD_RVALUE_REFERENCE__HPP | |
| #include <boost/config.hpp> | |
| //----------------------------------------------------------------------------// | |
| #include <boost/type_traits/is_void.hpp> | |
| #include <boost/type_traits/is_reference.hpp> | |
| // should be the last #include | |
| #include <boost/type_traits/detail/type_trait_def.hpp> | |
| //----------------------------------------------------------------------------// | |
| // // | |
| // C++03 implementation of // | |
| // 20.7.6.2 Reference modifications [meta.trans.ref] // | |
| // Written by Vicente J. Botet Escriba // | |
| // // | |
| // If T names an object or function type then the member typedef type | |
| // shall name T&&; otherwise, type shall name T. [ Note: This rule reflects | |
| // the semantics of reference collapsing. For example, when a type T names | |
| // a type T1&, the type add_rvalue_reference<T>::type is not an rvalue | |
| // reference. —end note ] | |
| //----------------------------------------------------------------------------// | |
| namespace boost { | |
| namespace type_traits_detail { | |
| template <typename T, bool b> | |
| struct add_rvalue_reference_helper | |
| { typedef T type; }; | |
| template <typename T> | |
| struct add_rvalue_reference_helper<T, true> | |
| { | |
| #if !defined(BOOST_NO_RVALUE_REFERENCES) | |
| typedef T&& type; | |
| #else | |
| typedef T type; | |
| #endif | |
| }; | |
| template <typename T> | |
| struct add_rvalue_reference_imp | |
| { | |
| typedef typename boost::type_traits_detail::add_rvalue_reference_helper | |
| <T, (!is_void<T>::value && !is_reference<T>::value) >::type type; | |
| }; | |
| } | |
| BOOST_TT_AUX_TYPE_TRAIT_DEF1(add_rvalue_reference,T,typename boost::type_traits_detail::add_rvalue_reference_imp<T>::type) | |
| } // namespace boost | |
| #include <boost/type_traits/detail/type_trait_undef.hpp> | |
| #endif // BOOST_TYPE_TRAITS_EXT_ADD_RVALUE_REFERENCE__HPP |