Jeff Thompson | f7d4994 | 2013-08-01 16:47:40 -0700 | [diff] [blame] | 1 | |
| 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). |
| 6 | // |
| 7 | // See http://www.boost.org/libs/type_traits for most recent version including documentation. |
| 8 | |
| 9 | #ifndef BOOST_TT_ADD_REFERENCE_HPP_INCLUDED |
| 10 | #define BOOST_TT_ADD_REFERENCE_HPP_INCLUDED |
| 11 | |
Jeff Thompson | 2277ce5 | 2013-08-01 17:34:11 -0700 | [diff] [blame] | 12 | #include <ndnboost/type_traits/is_reference.hpp> |
| 13 | #include <ndnboost/detail/workaround.hpp> |
| 14 | #include <ndnboost/config.hpp> |
Jeff Thompson | f7d4994 | 2013-08-01 16:47:40 -0700 | [diff] [blame] | 15 | |
| 16 | // should be the last #include |
Jeff Thompson | 2277ce5 | 2013-08-01 17:34:11 -0700 | [diff] [blame] | 17 | #include <ndnboost/type_traits/detail/type_trait_def.hpp> |
Jeff Thompson | f7d4994 | 2013-08-01 16:47:40 -0700 | [diff] [blame] | 18 | |
| 19 | namespace ndnboost { |
| 20 | |
| 21 | namespace detail { |
| 22 | |
| 23 | #if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) && defined(BOOST_MSVC6_MEMBER_TEMPLATES) |
| 24 | |
| 25 | template <bool x> |
| 26 | struct reference_adder |
| 27 | { |
| 28 | template <typename T> struct result_ |
| 29 | { |
| 30 | typedef T& type; |
| 31 | }; |
| 32 | }; |
| 33 | |
| 34 | template <> |
| 35 | struct reference_adder<true> |
| 36 | { |
| 37 | template <typename T> struct result_ |
| 38 | { |
| 39 | typedef T type; |
| 40 | }; |
| 41 | }; |
| 42 | |
| 43 | template <typename T> |
| 44 | struct add_reference_impl |
| 45 | { |
| 46 | typedef typename reference_adder< |
| 47 | ::ndnboost::is_reference<T>::value |
| 48 | >::template result_<T> result; |
| 49 | |
| 50 | typedef typename result::type type; |
| 51 | }; |
| 52 | |
| 53 | #else |
| 54 | // |
| 55 | // We can't filter out rvalue_references at the same level as |
| 56 | // references or we get ambiguities from msvc: |
| 57 | // |
| 58 | |
| 59 | template <typename T> |
| 60 | struct add_reference_rvalue_layer |
| 61 | { |
| 62 | typedef T& type; |
| 63 | }; |
| 64 | |
| 65 | #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES |
| 66 | template <typename T> |
| 67 | struct add_reference_rvalue_layer<T&&> |
| 68 | { |
| 69 | typedef T&& type; |
| 70 | }; |
| 71 | #endif |
| 72 | |
| 73 | template <typename T> |
| 74 | struct add_reference_impl |
| 75 | { |
| 76 | typedef typename add_reference_rvalue_layer<T>::type type; |
| 77 | }; |
| 78 | |
| 79 | #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
| 80 | BOOST_TT_AUX_TYPE_TRAIT_IMPL_PARTIAL_SPEC1_1(typename T,add_reference,T&,T&) |
| 81 | #endif |
| 82 | |
| 83 | #endif |
| 84 | |
| 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) |
| 91 | #endif |
| 92 | |
| 93 | } // namespace detail |
| 94 | |
| 95 | BOOST_TT_AUX_TYPE_TRAIT_DEF1(add_reference,T,typename ndnboost::detail::add_reference_impl<T>::type) |
| 96 | |
| 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&) |
| 101 | #endif |
| 102 | |
| 103 | } // namespace ndnboost |
| 104 | |
Jeff Thompson | 2277ce5 | 2013-08-01 17:34:11 -0700 | [diff] [blame] | 105 | #include <ndnboost/type_traits/detail/type_trait_undef.hpp> |
Jeff Thompson | f7d4994 | 2013-08-01 16:47:40 -0700 | [diff] [blame] | 106 | |
| 107 | #endif // BOOST_TT_ADD_REFERENCE_HPP_INCLUDED |