// add_rvalue_reference.hpp ---------------------------------------------------------//
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// Copyright 2010 Vicente J. Botet Escriba
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// Distributed under the Boost Software License, Version 1.0.
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// See http://www.boost.org/LICENSE_1_0.txt
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#ifndef BOOST_TYPE_TRAITS_EXT_ADD_RVALUE_REFERENCE__HPP
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#define BOOST_TYPE_TRAITS_EXT_ADD_RVALUE_REFERENCE__HPP
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#include <boost/config.hpp>
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//----------------------------------------------------------------------------//
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#include <boost/type_traits/is_void.hpp>
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#include <boost/type_traits/is_reference.hpp>
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//----------------------------------------------------------------------------//
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// //
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// C++03 implementation of //
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// 20.9.7.2 Reference modifications [meta.trans.ref] //
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// Written by Vicente J. Botet Escriba //
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// //
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// If T names an object or function type then the member typedef type
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// shall name T&&; otherwise, type shall name T. [ Note: This rule reflects
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// the semantics of reference collapsing. For example, when a type T names
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// a type T1&, the type add_rvalue_reference<T>::type is not an rvalue
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// reference. -end note ]
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//----------------------------------------------------------------------------//
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namespace boost {
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namespace type_traits_detail {
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template <typename T, bool b>
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struct add_rvalue_reference_helper
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{ typedef T type; };
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#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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template <typename T>
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struct add_rvalue_reference_helper<T, true>
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{
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typedef T&& type;
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};
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#endif
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template <typename T>
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struct add_rvalue_reference_imp
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{
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typedef typename boost::type_traits_detail::add_rvalue_reference_helper
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<T, (is_void<T>::value == false && is_reference<T>::value == false) >::type type;
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};
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}
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template <class T> struct add_rvalue_reference
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{
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typedef typename boost::type_traits_detail::add_rvalue_reference_imp<T>::type type;
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};
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#if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
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template <class T> using add_rvalue_reference_t = typename add_rvalue_reference<T>::type;
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#endif
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} // namespace boost
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#endif // BOOST_TYPE_TRAITS_EXT_ADD_RVALUE_REFERENCE__HPP
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