1 | |
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2 | // (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, Howard |
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3 | // Hinnant & John Maddock 2000. |
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4 | // Use, modification and distribution are subject to the Boost Software License, |
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5 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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6 | // http://www.boost.org/LICENSE_1_0.txt). |
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7 | // |
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8 | // See http://www.boost.org/libs/type_traits for most recent version including documentation. |
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9 | |
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10 | |
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11 | #ifndef BOOST_TT_IS_ENUM_HPP_INCLUDED |
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12 | #define BOOST_TT_IS_ENUM_HPP_INCLUDED |
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13 | |
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14 | #include <boost/type_traits/intrinsics.hpp> |
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15 | #ifndef BOOST_IS_ENUM |
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16 | #include <boost/type_traits/add_reference.hpp> |
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17 | #include <boost/type_traits/is_arithmetic.hpp> |
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18 | #include <boost/type_traits/is_reference.hpp> |
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19 | #include <boost/type_traits/is_convertible.hpp> |
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20 | #include <boost/type_traits/is_array.hpp> |
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21 | #ifdef __GNUC__ |
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22 | #include <boost/type_traits/is_function.hpp> |
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23 | #endif |
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24 | #include <boost/type_traits/config.hpp> |
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25 | #if defined(BOOST_TT_HAS_CONFORMING_IS_CLASS_IMPLEMENTATION) |
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26 | # include <boost/type_traits/is_class.hpp> |
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27 | # include <boost/type_traits/is_union.hpp> |
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28 | #endif |
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29 | #endif |
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30 | |
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31 | // should be the last #include |
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32 | #include <boost/type_traits/detail/bool_trait_def.hpp> |
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33 | |
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34 | namespace boost { |
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35 | |
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36 | #ifndef BOOST_IS_ENUM |
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37 | #if !(defined(__BORLANDC__) && (__BORLANDC__ <= 0x551)) |
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38 | |
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39 | namespace detail { |
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40 | |
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41 | #if defined(BOOST_TT_HAS_CONFORMING_IS_CLASS_IMPLEMENTATION) |
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42 | |
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43 | template <typename T> |
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44 | struct is_class_or_union |
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45 | { |
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46 | BOOST_STATIC_CONSTANT(bool, value = |
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47 | (::boost::type_traits::ice_or< |
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48 | ::boost::is_class<T>::value |
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49 | , ::boost::is_union<T>::value |
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50 | >::value)); |
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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 | template <typename T> |
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56 | struct is_class_or_union |
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57 | { |
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58 | # if BOOST_WORKAROUND(BOOST_MSVC, < 1300) || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x581))// we simply can't detect it this way. |
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59 | BOOST_STATIC_CONSTANT(bool, value = false); |
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60 | # else |
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61 | template <class U> static ::boost::type_traits::yes_type is_class_or_union_tester(void(U::*)(void)); |
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62 | |
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63 | # if BOOST_WORKAROUND(BOOST_MSVC, == 1300) \ |
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64 | || BOOST_WORKAROUND(__MWERKS__, <= 0x3000) // no SFINAE |
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65 | static ::boost::type_traits::no_type is_class_or_union_tester(...); |
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66 | BOOST_STATIC_CONSTANT( |
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67 | bool, value = sizeof(is_class_or_union_tester(0)) == sizeof(::boost::type_traits::yes_type)); |
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68 | # else |
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69 | template <class U> |
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70 | static ::boost::type_traits::no_type is_class_or_union_tester(...); |
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71 | BOOST_STATIC_CONSTANT( |
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72 | bool, value = sizeof(is_class_or_union_tester<T>(0)) == sizeof(::boost::type_traits::yes_type)); |
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73 | # endif |
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74 | # endif |
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75 | }; |
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76 | #endif |
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77 | |
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78 | struct int_convertible |
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79 | { |
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80 | int_convertible(int); |
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81 | }; |
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82 | |
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83 | // Don't evaluate convertibility to int_convertible unless the type |
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84 | // is non-arithmetic. This suppresses warnings with GCC. |
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85 | template <bool is_typename_arithmetic_or_reference = true> |
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86 | struct is_enum_helper |
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87 | { |
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88 | template <typename T> struct type |
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89 | { |
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90 | BOOST_STATIC_CONSTANT(bool, value = false); |
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91 | }; |
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92 | }; |
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93 | |
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94 | template <> |
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95 | struct is_enum_helper<false> |
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96 | { |
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97 | template <typename T> struct type |
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98 | : ::boost::is_convertible<typename boost::add_reference<T>::type,::boost::detail::int_convertible> |
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99 | { |
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100 | }; |
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101 | }; |
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102 | |
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103 | template <typename T> struct is_enum_impl |
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104 | { |
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105 | //typedef ::boost::add_reference<T> ar_t; |
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106 | //typedef typename ar_t::type r_type; |
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107 | |
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108 | #if defined(__GNUC__) |
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109 | |
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110 | #ifdef BOOST_TT_HAS_CONFORMING_IS_CLASS_IMPLEMENTATION |
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111 | |
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112 | // We MUST check for is_class_or_union on conforming compilers in |
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113 | // order to correctly deduce that noncopyable types are not enums |
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114 | // (dwa 2002/04/15)... |
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115 | BOOST_STATIC_CONSTANT(bool, selector = |
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116 | (::boost::type_traits::ice_or< |
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117 | ::boost::is_arithmetic<T>::value |
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118 | , ::boost::is_reference<T>::value |
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119 | , ::boost::is_function<T>::value |
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120 | , is_class_or_union<T>::value |
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121 | , is_array<T>::value |
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122 | >::value)); |
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123 | #else |
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124 | // ...however, not checking is_class_or_union on non-conforming |
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125 | // compilers prevents a dependency recursion. |
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126 | BOOST_STATIC_CONSTANT(bool, selector = |
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127 | (::boost::type_traits::ice_or< |
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128 | ::boost::is_arithmetic<T>::value |
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129 | , ::boost::is_reference<T>::value |
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130 | , ::boost::is_function<T>::value |
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131 | , is_array<T>::value |
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132 | >::value)); |
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133 | #endif // BOOST_TT_HAS_CONFORMING_IS_CLASS_IMPLEMENTATION |
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134 | |
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135 | #else // !defined(__GNUC__): |
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136 | |
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137 | BOOST_STATIC_CONSTANT(bool, selector = |
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138 | (::boost::type_traits::ice_or< |
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139 | ::boost::is_arithmetic<T>::value |
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140 | , ::boost::is_reference<T>::value |
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141 | , is_class_or_union<T>::value |
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142 | , is_array<T>::value |
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143 | >::value)); |
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144 | |
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145 | #endif |
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146 | |
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147 | #if BOOST_WORKAROUND(__BORLANDC__, < 0x600) |
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148 | typedef ::boost::detail::is_enum_helper< |
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149 | ::boost::detail::is_enum_impl<T>::selector |
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150 | > se_t; |
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151 | #else |
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152 | typedef ::boost::detail::is_enum_helper<selector> se_t; |
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153 | #endif |
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154 | |
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155 | typedef typename se_t::template type<T> helper; |
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156 | BOOST_STATIC_CONSTANT(bool, value = helper::value); |
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157 | }; |
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158 | |
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159 | // these help on compilers with no partial specialization support: |
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160 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_enum,void,false) |
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161 | #ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS |
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162 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_enum,void const,false) |
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163 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_enum,void volatile,false) |
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164 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_enum,void const volatile,false) |
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165 | #endif |
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166 | |
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167 | } // namespace detail |
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168 | |
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169 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_enum,T,::boost::detail::is_enum_impl<T>::value) |
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170 | |
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171 | #else // __BORLANDC__ |
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172 | // |
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173 | // buggy is_convertible prevents working |
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174 | // implementation of is_enum: |
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175 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_enum,T,false) |
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176 | |
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177 | #endif |
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178 | |
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179 | #else // BOOST_IS_ENUM |
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180 | |
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181 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_enum,T,BOOST_IS_ENUM(T)) |
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182 | |
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183 | #endif |
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184 | |
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185 | } // namespace boost |
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186 | |
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187 | #include <boost/type_traits/detail/bool_trait_undef.hpp> |
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188 | |
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189 | #endif // BOOST_TT_IS_ENUM_HPP_INCLUDED |
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