2 // (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
3 // Use, modification and distribution are subject to the Boost Software License,
4 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
5 // http://www.boost.org/LICENSE_1_0.txt).
7 // See http://www.boost.org/libs/type_traits for most recent version including documentation.
9 #ifndef BOOST_TT_ADD_REFERENCE_HPP_INCLUDED
10 #define BOOST_TT_ADD_REFERENCE_HPP_INCLUDED
12 #include <boost/type_traits/is_reference.hpp>
13 #include <boost/detail/workaround.hpp>
14 #include <boost/config.hpp>
16 // should be the last #include
17 #include <boost/type_traits/detail/type_trait_def.hpp>
23 #if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) && defined(BOOST_MSVC6_MEMBER_TEMPLATES)
26 struct reference_adder
28 template <typename T> struct result_
35 struct reference_adder<true>
37 template <typename T> struct result_
44 struct add_reference_impl
46 typedef typename reference_adder<
47 ::boost::is_reference<T>::value
48 >::template result_<T> result;
50 typedef typename result::type type;
55 // We can't filter out rvalue_references at the same level as
56 // references or we get ambiguities from msvc:
60 struct add_reference_rvalue_layer
65 #ifndef BOOST_NO_RVALUE_REFERENCES
67 struct add_reference_rvalue_layer<T&&>
74 struct add_reference_impl
76 typedef typename add_reference_rvalue_layer<T>::type type;
79 #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
80 BOOST_TT_AUX_TYPE_TRAIT_IMPL_PARTIAL_SPEC1_1(typename T,add_reference,T&,T&)
85 // these full specialisations are always required:
86 BOOST_TT_AUX_TYPE_TRAIT_IMPL_SPEC1(add_reference,void,void)
87 #ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
88 BOOST_TT_AUX_TYPE_TRAIT_IMPL_SPEC1(add_reference,void const,void const)
89 BOOST_TT_AUX_TYPE_TRAIT_IMPL_SPEC1(add_reference,void volatile,void volatile)
90 BOOST_TT_AUX_TYPE_TRAIT_IMPL_SPEC1(add_reference,void const volatile,void const volatile)
95 BOOST_TT_AUX_TYPE_TRAIT_DEF1(add_reference,T,typename boost::detail::add_reference_impl<T>::type)
97 // agurt, 07/mar/03: workaround Borland's ill-formed sensitivity to an additional
98 // level of indirection, here
99 #if BOOST_WORKAROUND(__BORLANDC__, < 0x600)
100 BOOST_TT_AUX_TYPE_TRAIT_PARTIAL_SPEC1_1(typename T,add_reference,T&,T&)
105 #include <boost/type_traits/detail/type_trait_undef.hpp>
107 #endif // BOOST_TT_ADD_REFERENCE_HPP_INCLUDED