// (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 <boost/type_traits/is_reference.hpp> | |
#include <boost/detail/workaround.hpp> | |
#include <boost/config.hpp> | |
// should be the last #include | |
#include <boost/type_traits/detail/type_trait_def.hpp> | |
namespace 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< | |
::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_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 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 boost | |
#include <boost/type_traits/detail/type_trait_undef.hpp> | |
#endif // BOOST_TT_ADD_REFERENCE_HPP_INCLUDED |