1 | |
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2 | // (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000. |
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3 | // Use, modification and distribution are subject to the Boost Software License, |
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4 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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5 | // http://www.boost.org/LICENSE_1_0.txt). |
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6 | // |
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7 | // See http://www.boost.org/libs/type_traits for most recent version including documentation. |
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8 | |
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9 | #ifndef BOOST_TT_ADD_REFERENCE_HPP_INCLUDED |
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10 | #define BOOST_TT_ADD_REFERENCE_HPP_INCLUDED |
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11 | |
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12 | #include <boost/type_traits/is_reference.hpp> |
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13 | #include <boost/detail/workaround.hpp> |
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14 | #include <boost/config.hpp> |
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15 | |
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16 | // should be the last #include |
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17 | #include <boost/type_traits/detail/type_trait_def.hpp> |
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18 | |
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19 | namespace boost { |
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20 | |
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21 | namespace detail { |
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22 | |
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23 | #if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) && defined(BOOST_MSVC6_MEMBER_TEMPLATES) |
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24 | |
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25 | template <bool x> |
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26 | struct reference_adder |
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27 | { |
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28 | template <typename T> struct result_ |
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29 | { |
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30 | typedef T& type; |
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31 | }; |
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32 | }; |
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33 | |
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34 | template <> |
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35 | struct reference_adder<true> |
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36 | { |
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37 | template <typename T> struct result_ |
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38 | { |
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39 | typedef T type; |
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40 | }; |
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41 | }; |
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42 | |
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43 | template <typename T> |
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44 | struct add_reference_impl |
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45 | { |
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46 | typedef typename reference_adder< |
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47 | ::boost::is_reference<T>::value |
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48 | >::template result_<T> result; |
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49 | |
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50 | typedef typename result::type type; |
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51 | }; |
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52 | |
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53 | #else |
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54 | // |
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55 | // We can't filter out rvalue_references at the same level as |
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56 | // references or we get ambiguities from msvc: |
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57 | // |
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58 | |
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59 | template <typename T> |
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60 | struct add_reference_rvalue_layer |
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61 | { |
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62 | typedef T& type; |
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63 | }; |
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64 | |
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65 | #ifndef BOOST_NO_RVALUE_REFERENCES |
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66 | template <typename T> |
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67 | struct add_reference_rvalue_layer<T&&> |
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68 | { |
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69 | typedef T&& type; |
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70 | }; |
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71 | #endif |
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72 | |
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73 | template <typename T> |
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74 | struct add_reference_impl |
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75 | { |
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76 | typedef typename add_reference_rvalue_layer<T>::type type; |
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77 | }; |
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78 | |
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79 | #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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80 | BOOST_TT_AUX_TYPE_TRAIT_IMPL_PARTIAL_SPEC1_1(typename T,add_reference,T&,T&) |
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81 | #endif |
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82 | |
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83 | #endif |
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84 | |
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85 | // these full specialisations are always required: |
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86 | BOOST_TT_AUX_TYPE_TRAIT_IMPL_SPEC1(add_reference,void,void) |
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87 | #ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS |
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88 | BOOST_TT_AUX_TYPE_TRAIT_IMPL_SPEC1(add_reference,void const,void const) |
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89 | BOOST_TT_AUX_TYPE_TRAIT_IMPL_SPEC1(add_reference,void volatile,void volatile) |
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90 | BOOST_TT_AUX_TYPE_TRAIT_IMPL_SPEC1(add_reference,void const volatile,void const volatile) |
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91 | #endif |
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92 | |
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93 | } // namespace detail |
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94 | |
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95 | BOOST_TT_AUX_TYPE_TRAIT_DEF1(add_reference,T,typename boost::detail::add_reference_impl<T>::type) |
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96 | |
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97 | // agurt, 07/mar/03: workaround Borland's ill-formed sensitivity to an additional |
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98 | // level of indirection, here |
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99 | #if BOOST_WORKAROUND(__BORLANDC__, < 0x600) |
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100 | BOOST_TT_AUX_TYPE_TRAIT_PARTIAL_SPEC1_1(typename T,add_reference,T&,T&) |
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101 | #endif |
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102 | |
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103 | } // namespace boost |
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104 | |
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105 | #include <boost/type_traits/detail/type_trait_undef.hpp> |
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106 | |
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107 | #endif // BOOST_TT_ADD_REFERENCE_HPP_INCLUDED |
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