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- // 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>
- //----------------------------------------------------------------------------//
- // //
- // C++03 implementation of //
- // 20.9.7.2 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; };
- #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
- template <typename T>
- struct add_rvalue_reference_helper<T, true>
- {
- 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 == false && is_reference<T>::value == false) >::type type;
- };
- }
- template <class T> struct add_rvalue_reference
- {
- typedef typename boost::type_traits_detail::add_rvalue_reference_imp<T>::type type;
- };
- #if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
- template <class T> using add_rvalue_reference_t = typename add_rvalue_reference<T>::type;
- #endif
- } // namespace boost
- #endif // BOOST_TYPE_TRAITS_EXT_ADD_RVALUE_REFERENCE__HPP
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