1 | |
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2 | // (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, |
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3 | // Howard Hinnant and John Maddock 2000. |
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4 | // (C) Copyright Mat Marcus, Jesse Jones and Adobe Systems Inc 2001 |
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5 | |
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6 | // Use, modification and distribution are subject to the Boost Software License, |
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7 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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8 | // http://www.boost.org/LICENSE_1_0.txt). |
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9 | // |
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10 | // See http://www.boost.org/libs/type_traits for most recent version including documentation. |
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11 | |
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12 | // Fixed is_pointer, is_reference, is_const, is_volatile, is_same, |
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13 | // is_member_pointer based on the Simulated Partial Specialization work |
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14 | // of Mat Marcus and Jesse Jones. See http://opensource.adobe.com or |
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15 | // http://groups.yahoo.com/group/boost/message/5441 |
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16 | // Some workarounds in here use ideas suggested from "Generic<Programming>: |
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17 | // Mappings between Types and Values" |
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18 | // by Andrei Alexandrescu (see http://www.cuj.com/experts/1810/alexandr.html). |
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19 | |
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20 | |
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21 | #ifndef BOOST_TT_IS_POINTER_HPP_INCLUDED |
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22 | #define BOOST_TT_IS_POINTER_HPP_INCLUDED |
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23 | |
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24 | #include <boost/type_traits/is_member_pointer.hpp> |
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25 | #include <boost/type_traits/detail/ice_and.hpp> |
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26 | #include <boost/type_traits/detail/ice_not.hpp> |
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27 | #include <boost/type_traits/config.hpp> |
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28 | #if !BOOST_WORKAROUND(BOOST_MSVC,<=1300) |
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29 | #include <boost/type_traits/remove_cv.hpp> |
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30 | #endif |
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31 | |
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32 | #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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33 | # include <boost/type_traits/is_reference.hpp> |
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34 | # include <boost/type_traits/is_array.hpp> |
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35 | # include <boost/type_traits/detail/is_function_ptr_tester.hpp> |
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36 | # include <boost/type_traits/detail/false_result.hpp> |
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37 | # include <boost/type_traits/detail/ice_or.hpp> |
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38 | #endif |
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39 | |
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40 | // should be the last #include |
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41 | #include <boost/type_traits/detail/bool_trait_def.hpp> |
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42 | |
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43 | namespace boost { |
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44 | |
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45 | #if defined( __CODEGEARC__ ) |
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46 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_pointer,T,__is_pointer(T)) |
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47 | #elif !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) |
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48 | |
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49 | namespace detail { |
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50 | |
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51 | template< typename T > struct is_pointer_helper |
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52 | { |
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53 | BOOST_STATIC_CONSTANT(bool, value = false); |
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54 | }; |
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55 | |
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56 | # define TT_AUX_BOOL_TRAIT_HELPER_PARTIAL_SPEC(helper,sp,result) \ |
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57 | template< typename T > struct helper<sp> \ |
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58 | { \ |
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59 | BOOST_STATIC_CONSTANT(bool, value = result); \ |
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60 | }; \ |
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61 | /**/ |
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62 | |
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63 | TT_AUX_BOOL_TRAIT_HELPER_PARTIAL_SPEC(is_pointer_helper,T*,true) |
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64 | |
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65 | # undef TT_AUX_BOOL_TRAIT_HELPER_PARTIAL_SPEC |
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66 | |
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67 | template< typename T > |
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68 | struct is_pointer_impl |
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69 | { |
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70 | #if BOOST_WORKAROUND(BOOST_MSVC,<=1300) |
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71 | BOOST_STATIC_CONSTANT(bool, value = |
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72 | (::boost::type_traits::ice_and< |
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73 | ::boost::detail::is_pointer_helper<T>::value |
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74 | , ::boost::type_traits::ice_not< |
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75 | ::boost::is_member_pointer<T>::value |
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76 | >::value |
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77 | >::value) |
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78 | ); |
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79 | #else |
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80 | BOOST_STATIC_CONSTANT(bool, value = |
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81 | (::boost::type_traits::ice_and< |
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82 | ::boost::detail::is_pointer_helper<typename remove_cv<T>::type>::value |
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83 | , ::boost::type_traits::ice_not< |
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84 | ::boost::is_member_pointer<T>::value |
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85 | >::value |
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86 | >::value) |
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87 | ); |
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88 | #endif |
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89 | }; |
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90 | |
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91 | } // namespace detail |
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92 | |
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93 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_pointer,T,::boost::detail::is_pointer_impl<T>::value) |
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94 | |
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95 | #if defined(__BORLANDC__) && !defined(__COMO__) && (__BORLANDC__ < 0x600) |
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96 | BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_pointer,T&,false) |
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97 | BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_pointer,T& const,false) |
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98 | BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_pointer,T& volatile,false) |
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99 | BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_pointer,T& const volatile,false) |
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100 | #endif |
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101 | |
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102 | #else // no partial template specialization |
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103 | |
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104 | namespace detail { |
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105 | |
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106 | struct pointer_helper |
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107 | { |
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108 | pointer_helper(const volatile void*); |
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109 | }; |
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110 | |
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111 | yes_type BOOST_TT_DECL is_pointer_tester(pointer_helper); |
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112 | no_type BOOST_TT_DECL is_pointer_tester(...); |
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113 | |
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114 | template <bool> |
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115 | struct is_pointer_select |
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116 | : ::boost::type_traits::false_result |
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117 | { |
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118 | }; |
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119 | |
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120 | template <> |
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121 | struct is_pointer_select<false> |
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122 | { |
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123 | template <typename T> struct result_ |
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124 | { |
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125 | static T& make_t(); |
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126 | BOOST_STATIC_CONSTANT(bool, value = |
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127 | (::boost::type_traits::ice_or< |
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128 | (1 == sizeof(is_pointer_tester(make_t()))), |
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129 | (1 == sizeof(type_traits::is_function_ptr_tester(make_t()))) |
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130 | >::value)); |
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131 | }; |
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132 | }; |
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133 | |
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134 | template <typename T> |
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135 | struct is_pointer_impl |
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136 | : is_pointer_select< |
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137 | ::boost::type_traits::ice_or< |
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138 | ::boost::is_reference<T>::value |
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139 | , ::boost::is_array<T>::value |
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140 | >::value |
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141 | >::template result_<T> |
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142 | { |
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143 | }; |
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144 | |
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145 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pointer,void,false) |
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146 | #ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS |
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147 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pointer,void const,false) |
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148 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pointer,void volatile,false) |
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149 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pointer,void const volatile,false) |
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150 | #endif |
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151 | |
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152 | } // namespace detail |
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153 | |
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154 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_pointer,T,::boost::detail::is_pointer_impl<T>::value) |
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155 | |
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156 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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157 | |
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158 | } // namespace boost |
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159 | |
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160 | #include <boost/type_traits/detail/bool_trait_undef.hpp> |
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161 | |
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162 | #endif // BOOST_TT_IS_POINTER_HPP_INCLUDED |
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