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add_rvalue_reference.hpp
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/
add_rvalue_reference.hpp
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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>
// 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