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// (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
// Use, modification and distribution are subject to the Boost Software License,
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt).
//
// See http://www.boost.org/libs/type_traits for most recent version including documentation.
#ifndef BOOST_TT_ADD_REFERENCE_HPP_INCLUDED
#define BOOST_TT_ADD_REFERENCE_HPP_INCLUDED
#include <cutl/details/boost/type_traits/is_reference.hpp>
#include <cutl/details/boost/detail/workaround.hpp>
#include <cutl/details/boost/config.hpp>
// should be the last #include
#include <cutl/details/boost/type_traits/detail/type_trait_def.hpp>
namespace cutl_details_boost {
namespace detail {
#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) && defined(BOOST_MSVC6_MEMBER_TEMPLATES)
template <bool x>
struct reference_adder
{
template <typename T> struct result_
{
typedef T& type;
};
};
template <>
struct reference_adder<true>
{
template <typename T> struct result_
{
typedef T type;
};
};
template <typename T>
struct add_reference_impl
{
typedef typename reference_adder<
::cutl_details_boost::is_reference<T>::value
>::template result_<T> result;
typedef typename result::type type;
};
#else
//
// We can't filter out rvalue_references at the same level as
// references or we get ambiguities from msvc:
//
template <typename T>
struct add_reference_rvalue_layer
{
typedef T& type;
};
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
template <typename T>
struct add_reference_rvalue_layer<T&&>
{
typedef T&& type;
};
#endif
template <typename T>
struct add_reference_impl
{
typedef typename add_reference_rvalue_layer<T>::type type;
};
#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
BOOST_TT_AUX_TYPE_TRAIT_IMPL_PARTIAL_SPEC1_1(typename T,add_reference,T&,T&)
#endif
#endif
// these full specialisations are always required:
BOOST_TT_AUX_TYPE_TRAIT_IMPL_SPEC1(add_reference,void,void)
#ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
BOOST_TT_AUX_TYPE_TRAIT_IMPL_SPEC1(add_reference,void const,void const)
BOOST_TT_AUX_TYPE_TRAIT_IMPL_SPEC1(add_reference,void volatile,void volatile)
BOOST_TT_AUX_TYPE_TRAIT_IMPL_SPEC1(add_reference,void const volatile,void const volatile)
#endif
} // namespace detail
BOOST_TT_AUX_TYPE_TRAIT_DEF1(add_reference,T,typename cutl_details_boost::detail::add_reference_impl<T>::type)
// agurt, 07/mar/03: workaround Borland's ill-formed sensitivity to an additional
// level of indirection, here
#if BOOST_WORKAROUND(__BORLANDC__, < 0x600)
BOOST_TT_AUX_TYPE_TRAIT_PARTIAL_SPEC1_1(typename T,add_reference,T&,T&)
#endif
} // namespace cutl_details_boost
#include <cutl/details/boost/type_traits/detail/type_trait_undef.hpp>
#endif // BOOST_TT_ADD_REFERENCE_HPP_INCLUDED
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