2 // (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
3 // Permission to copy, use, modify, sell and distribute this software is
4 // granted provided this copyright notice appears in all copies. This software
5 // is provided "as is" without express or implied warranty, and with no claim
6 // as to its suitability for any purpose.
8 // See http://www.boost.org for most recent version including documentation.
10 #ifndef BOOST_TT_ADD_REFERENCE_HPP_INCLUDED
11 #define BOOST_TT_ADD_REFERENCE_HPP_INCLUDED
13 #include "boost/type_traits/is_reference.hpp"
14 #include "boost/detail/workaround.hpp"
15 #include "boost/config.hpp"
17 // should be the last #include
18 #include "boost/type_traits/detail/type_trait_def.hpp"
24 #if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) && defined(BOOST_MSVC6_MEMBER_TEMPLATES)
27 struct reference_adder
29 template <typename T> struct result_
36 struct reference_adder<true>
38 template <typename T> struct result_
45 struct add_reference_impl
47 typedef typename reference_adder<
48 ::boost::is_reference<T>::value
49 >::template result_<T> result;
51 typedef typename result::type type;
57 struct add_reference_impl
62 #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
63 BOOST_TT_AUX_TYPE_TRAIT_IMPL_PARTIAL_SPEC1_1(typename T,add_reference,T&,T&)
68 // these full specialisations are always required:
69 BOOST_TT_AUX_TYPE_TRAIT_IMPL_SPEC1(add_reference,void,void)
70 #ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
71 BOOST_TT_AUX_TYPE_TRAIT_IMPL_SPEC1(add_reference,void const,void const)
72 BOOST_TT_AUX_TYPE_TRAIT_IMPL_SPEC1(add_reference,void volatile,void volatile)
73 BOOST_TT_AUX_TYPE_TRAIT_IMPL_SPEC1(add_reference,void const volatile,void const volatile)
78 BOOST_TT_AUX_TYPE_TRAIT_DEF1(add_reference,T,typename detail::add_reference_impl<T>::type)
80 // agurt, 07/mar/03: workaround Borland's ill-formed sensitivity to an additional
81 // level of indirection, here
82 #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x561))
83 BOOST_TT_AUX_TYPE_TRAIT_PARTIAL_SPEC1_1(typename T,add_reference,T&,T&)
88 #include "boost/type_traits/detail/type_trait_undef.hpp"
90 #endif // BOOST_TT_ADD_REFERENCE_HPP_INCLUDED