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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 |
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29 | #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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30 | # include "boost/type_traits/is_reference.hpp"
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31 | # include "boost/type_traits/is_array.hpp"
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32 | # include "boost/type_traits/detail/is_function_ptr_tester.hpp"
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33 | # include "boost/type_traits/detail/false_result.hpp"
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34 | # include "boost/type_traits/detail/ice_or.hpp"
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35 | #endif
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36 |
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37 | // should be the last #include
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38 | #include "boost/type_traits/detail/bool_trait_def.hpp"
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39 |
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40 | namespace boost {
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41 |
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42 | #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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43 |
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44 | namespace detail {
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45 |
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46 | template< typename T > struct is_pointer_helper
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47 | {
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48 | BOOST_STATIC_CONSTANT(bool, value = false);
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49 | };
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50 |
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51 | # define TT_AUX_BOOL_TRAIT_HELPER_PARTIAL_SPEC(helper,sp,result) \
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52 | template< typename T > struct helper<sp> \
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53 | { \
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54 | BOOST_STATIC_CONSTANT(bool, value = result); \
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55 | }; \
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56 | /**/
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57 |
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58 | TT_AUX_BOOL_TRAIT_HELPER_PARTIAL_SPEC(is_pointer_helper,T*,true)
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59 | TT_AUX_BOOL_TRAIT_HELPER_PARTIAL_SPEC(is_pointer_helper,T* const,true)
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60 | TT_AUX_BOOL_TRAIT_HELPER_PARTIAL_SPEC(is_pointer_helper,T* volatile,true)
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61 | TT_AUX_BOOL_TRAIT_HELPER_PARTIAL_SPEC(is_pointer_helper,T* const volatile,true)
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62 |
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63 | # undef TT_AUX_BOOL_TRAIT_HELPER_PARTIAL_SPEC
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64 |
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65 | template< typename T >
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66 | struct is_pointer_impl
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67 | {
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68 | BOOST_STATIC_CONSTANT(bool, value =
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69 | (::boost::type_traits::ice_and<
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70 | ::boost::detail::is_pointer_helper<T>::value
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71 | , ::boost::type_traits::ice_not<
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72 | ::boost::is_member_pointer<T>::value
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73 | >::value
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74 | >::value)
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75 | );
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76 | };
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77 |
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78 | } // namespace detail
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79 |
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80 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_pointer,T,::boost::detail::is_pointer_impl<T>::value)
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81 |
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82 | #if defined(__BORLANDC__) && !defined(__COMO__) && (__BORLANDC__ < 0x600)
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83 | BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_pointer,T&,false)
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84 | BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_pointer,T& const,false)
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85 | BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_pointer,T& volatile,false)
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86 | BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_pointer,T& const volatile,false)
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87 | #endif
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88 |
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89 | #else // no partial template specialization
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90 |
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91 | namespace detail {
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92 |
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93 | struct pointer_helper
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94 | {
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95 | pointer_helper(const volatile void*);
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96 | };
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97 |
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98 | yes_type BOOST_TT_DECL is_pointer_tester(pointer_helper);
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99 | no_type BOOST_TT_DECL is_pointer_tester(...);
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100 |
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101 | template <bool>
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102 | struct is_pointer_select
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103 | : ::boost::type_traits::false_result
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104 | {
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105 | };
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106 |
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107 | template <>
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108 | struct is_pointer_select<false>
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109 | {
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110 | template <typename T> struct result_
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111 | {
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112 | static T& make_t();
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113 | BOOST_STATIC_CONSTANT(bool, value =
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114 | (::boost::type_traits::ice_or<
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115 | (1 == sizeof(is_pointer_tester(make_t()))),
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116 | (1 == sizeof(type_traits::is_function_ptr_tester(make_t())))
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117 | >::value));
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118 | };
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119 | };
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120 |
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121 | template <typename T>
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122 | struct is_pointer_impl
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123 | : is_pointer_select<
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124 | ::boost::type_traits::ice_or<
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125 | ::boost::is_reference<T>::value
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126 | , ::boost::is_array<T>::value
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127 | >::value
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128 | >::template result_<T>
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129 | {
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130 | };
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131 |
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132 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pointer,void,false)
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133 | #ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
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134 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pointer,void const,false)
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135 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pointer,void volatile,false)
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136 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pointer,void const volatile,false)
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137 | #endif
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138 |
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139 | } // namespace detail
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140 |
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141 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_pointer,T,::boost::detail::is_pointer_impl<T>::value)
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142 |
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143 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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144 |
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145 | } // namespace boost
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146 |
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147 | #include "boost/type_traits/detail/bool_trait_undef.hpp"
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148 |
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149 | #endif // BOOST_TT_IS_POINTER_HPP_INCLUDED
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