1 | // (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, Howard |
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2 | // Hinnant & John Maddock 2000-2003. |
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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 | |
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10 | #ifndef BOOST_TT_IS_CLASS_HPP_INCLUDED |
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11 | #define BOOST_TT_IS_CLASS_HPP_INCLUDED |
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12 | |
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13 | #include <boost/type_traits/config.hpp> |
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14 | #include <boost/type_traits/intrinsics.hpp> |
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15 | #ifndef BOOST_IS_CLASS |
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16 | # include <boost/type_traits/is_union.hpp> |
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17 | # include <boost/type_traits/detail/ice_and.hpp> |
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18 | # include <boost/type_traits/detail/ice_not.hpp> |
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19 | |
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20 | #ifdef BOOST_TT_HAS_CONFORMING_IS_CLASS_IMPLEMENTATION |
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21 | # include <boost/type_traits/detail/yes_no_type.hpp> |
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22 | #else |
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23 | # include <boost/type_traits/is_scalar.hpp> |
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24 | # include <boost/type_traits/is_array.hpp> |
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25 | # include <boost/type_traits/is_reference.hpp> |
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26 | # include <boost/type_traits/is_void.hpp> |
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27 | # include <boost/type_traits/is_function.hpp> |
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28 | #endif |
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29 | |
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30 | #endif // BOOST_IS_CLASS |
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31 | |
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32 | #ifdef __EDG_VERSION__ |
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33 | # include <boost/type_traits/remove_cv.hpp> |
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34 | #endif |
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35 | |
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36 | // should be the last #include |
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37 | #include <boost/type_traits/detail/bool_trait_def.hpp> |
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38 | |
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39 | namespace boost { |
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40 | |
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41 | namespace detail { |
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42 | |
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43 | #ifndef BOOST_IS_CLASS |
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44 | #ifdef BOOST_TT_HAS_CONFORMING_IS_CLASS_IMPLEMENTATION |
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45 | |
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46 | // This is actually the conforming implementation which works with |
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47 | // abstract classes. However, enough compilers have trouble with |
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48 | // it that most will use the one in |
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49 | // boost/type_traits/object_traits.hpp. This implementation |
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50 | // actually works with VC7.0, but other interactions seem to fail |
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51 | // when we use it. |
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52 | |
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53 | // is_class<> metafunction due to Paul Mensonides |
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54 | // (leavings@attbi.com). For more details: |
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55 | // http://groups.google.com/groups?hl=en&selm=000001c1cc83%24e154d5e0%247772e50c%40c161550a&rnum=1 |
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56 | #if defined(__GNUC__) && !defined(__EDG_VERSION__) |
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57 | |
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58 | template <class U> ::boost::type_traits::yes_type is_class_tester(void(U::*)(void)); |
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59 | template <class U> ::boost::type_traits::no_type is_class_tester(...); |
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60 | |
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61 | template <typename T> |
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62 | struct is_class_impl |
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63 | { |
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64 | |
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65 | BOOST_STATIC_CONSTANT(bool, value = |
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66 | (::boost::type_traits::ice_and< |
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67 | sizeof(is_class_tester<T>(0)) == sizeof(::boost::type_traits::yes_type), |
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68 | ::boost::type_traits::ice_not< ::boost::is_union<T>::value >::value |
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69 | >::value) |
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70 | ); |
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71 | }; |
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72 | |
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73 | #else |
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74 | |
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75 | template <typename T> |
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76 | struct is_class_impl |
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77 | { |
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78 | template <class U> static ::boost::type_traits::yes_type is_class_tester(void(U::*)(void)); |
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79 | template <class U> static ::boost::type_traits::no_type is_class_tester(...); |
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80 | |
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81 | BOOST_STATIC_CONSTANT(bool, value = |
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82 | (::boost::type_traits::ice_and< |
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83 | sizeof(is_class_tester<T>(0)) == sizeof(::boost::type_traits::yes_type), |
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84 | ::boost::type_traits::ice_not< ::boost::is_union<T>::value >::value |
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85 | >::value) |
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86 | ); |
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87 | }; |
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88 | |
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89 | #endif |
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90 | |
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91 | #else |
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92 | |
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93 | template <typename T> |
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94 | struct is_class_impl |
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95 | { |
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96 | # ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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97 | BOOST_STATIC_CONSTANT(bool, value = |
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98 | (::boost::type_traits::ice_and< |
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99 | ::boost::type_traits::ice_not< ::boost::is_union<T>::value >::value, |
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100 | ::boost::type_traits::ice_not< ::boost::is_scalar<T>::value >::value, |
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101 | ::boost::type_traits::ice_not< ::boost::is_array<T>::value >::value, |
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102 | ::boost::type_traits::ice_not< ::boost::is_reference<T>::value>::value, |
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103 | ::boost::type_traits::ice_not< ::boost::is_void<T>::value >::value, |
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104 | ::boost::type_traits::ice_not< ::boost::is_function<T>::value >::value |
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105 | >::value)); |
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106 | # else |
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107 | BOOST_STATIC_CONSTANT(bool, value = |
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108 | (::boost::type_traits::ice_and< |
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109 | ::boost::type_traits::ice_not< ::boost::is_union<T>::value >::value, |
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110 | ::boost::type_traits::ice_not< ::boost::is_scalar<T>::value >::value, |
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111 | ::boost::type_traits::ice_not< ::boost::is_array<T>::value >::value, |
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112 | ::boost::type_traits::ice_not< ::boost::is_reference<T>::value>::value, |
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113 | ::boost::type_traits::ice_not< ::boost::is_void<T>::value >::value |
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114 | >::value)); |
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115 | # endif |
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116 | }; |
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117 | |
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118 | # endif // BOOST_TT_HAS_CONFORMING_IS_CLASS_IMPLEMENTATION |
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119 | # else // BOOST_IS_CLASS |
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120 | template <typename T> |
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121 | struct is_class_impl |
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122 | { |
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123 | BOOST_STATIC_CONSTANT(bool, value = BOOST_IS_CLASS(T)); |
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124 | }; |
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125 | # endif // BOOST_IS_CLASS |
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126 | |
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127 | } // namespace detail |
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128 | |
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129 | # ifdef __EDG_VERSION__ |
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130 | BOOST_TT_AUX_BOOL_TRAIT_DEF1( |
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131 | is_class,T, boost::detail::is_class_impl<typename boost::remove_cv<T>::type>::value) |
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132 | # else |
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133 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_class,T,::boost::detail::is_class_impl<T>::value) |
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134 | # endif |
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135 | |
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136 | } // namespace boost |
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137 | |
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138 | #include <boost/type_traits/detail/bool_trait_undef.hpp> |
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139 | |
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140 | #endif // BOOST_TT_IS_CLASS_HPP_INCLUDED |
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