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/add_reference.hpp"
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15 | #include "boost/type_traits/is_arithmetic.hpp"
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16 | #include "boost/type_traits/is_reference.hpp"
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17 | #include "boost/type_traits/is_convertible.hpp"
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18 | #include "boost/type_traits/is_array.hpp"
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19 | #ifdef __GNUC__
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20 | #include <boost/type_traits/is_function.hpp>
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21 | #endif
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22 | #include "boost/type_traits/config.hpp"
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23 | #if defined(BOOST_TT_HAS_CONFORMING_IS_CLASS_IMPLEMENTATION)
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24 | # include <boost/type_traits/is_class.hpp>
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25 | # include <boost/type_traits/is_union.hpp>
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26 | #endif
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27 |
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28 |
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29 | // should be the last #include
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30 | #include "boost/type_traits/detail/bool_trait_def.hpp"
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31 |
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32 | namespace boost {
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33 |
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34 | #if !(defined(__BORLANDC__) && (__BORLANDC__ <= 0x551))
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35 |
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36 | namespace detail {
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37 |
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38 | #if defined(BOOST_TT_HAS_CONFORMING_IS_CLASS_IMPLEMENTATION)
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39 |
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40 | template <typename T>
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41 | struct is_class_or_union
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42 | {
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43 | BOOST_STATIC_CONSTANT(bool, value =
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44 | (::boost::type_traits::ice_or<
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45 | ::boost::is_class<T>::value
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46 | , ::boost::is_union<T>::value
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47 | >::value));
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48 | };
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49 |
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50 | #else
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51 |
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52 | template <typename T>
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53 | struct is_class_or_union
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54 | {
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55 | # if BOOST_WORKAROUND(BOOST_MSVC, == 1200) || BOOST_WORKAROUND(__BORLANDC__, <= 0x570)// we simply can't detect it this way.
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56 | BOOST_STATIC_CONSTANT(bool, value = false);
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57 | # else
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58 | template <class U> static ::boost::type_traits::yes_type is_class_or_union_tester(void(U::*)(void));
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59 |
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60 | # if BOOST_WORKAROUND(BOOST_MSVC, == 1300) \
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61 | || BOOST_WORKAROUND(__MWERKS__, <= 0x3000) // no SFINAE
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62 | static ::boost::type_traits::no_type is_class_or_union_tester(...);
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63 | BOOST_STATIC_CONSTANT(
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64 | bool, value = sizeof(is_class_or_union_tester(0)) == sizeof(::boost::type_traits::yes_type));
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65 | # else
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66 | template <class U>
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67 | static ::boost::type_traits::no_type is_class_or_union_tester(...);
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68 | BOOST_STATIC_CONSTANT(
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69 | bool, value = sizeof(is_class_or_union_tester<T>(0)) == sizeof(::boost::type_traits::yes_type));
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70 | # endif
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71 | # endif
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72 | };
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73 | #endif
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74 |
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75 | struct int_convertible
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76 | {
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77 | int_convertible(int);
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78 | };
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79 |
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80 | // Don't evaluate convertibility to int_convertible unless the type
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81 | // is non-arithmetic. This suppresses warnings with GCC.
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82 | template <bool is_typename_arithmetic_or_reference = true>
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83 | struct is_enum_helper
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84 | {
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85 | template <typename T> struct type
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86 | {
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87 | BOOST_STATIC_CONSTANT(bool, value = false);
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88 | };
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89 | };
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90 |
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91 | template <>
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92 | struct is_enum_helper<false>
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93 | {
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94 | template <typename T> struct type
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95 | : ::boost::is_convertible<typename boost::add_reference<T>::type,::boost::detail::int_convertible>
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96 | {
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97 | };
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98 | };
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99 |
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100 | template <typename T> struct is_enum_impl
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101 | {
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102 | //typedef ::boost::add_reference<T> ar_t;
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103 | //typedef typename ar_t::type r_type;
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104 |
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105 | #if defined(__GNUC__)
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106 |
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107 | #ifdef BOOST_TT_HAS_CONFORMING_IS_CLASS_IMPLEMENTATION
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108 |
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109 | // We MUST check for is_class_or_union on conforming compilers in
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110 | // order to correctly deduce that noncopyable types are not enums
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111 | // (dwa 2002/04/15)...
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112 | BOOST_STATIC_CONSTANT(bool, selector =
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113 | (::boost::type_traits::ice_or<
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114 | ::boost::is_arithmetic<T>::value
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115 | , ::boost::is_reference<T>::value
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116 | , ::boost::is_function<T>::value
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117 | , is_class_or_union<T>::value
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118 | , is_array<T>::value
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119 | >::value));
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120 | #else
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121 | // ...however, not checking is_class_or_union on non-conforming
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122 | // compilers prevents a dependency recursion.
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123 | BOOST_STATIC_CONSTANT(bool, selector =
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124 | (::boost::type_traits::ice_or<
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125 | ::boost::is_arithmetic<T>::value
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126 | , ::boost::is_reference<T>::value
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127 | , ::boost::is_function<T>::value
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128 | , is_array<T>::value
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129 | >::value));
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130 | #endif // BOOST_TT_HAS_CONFORMING_IS_CLASS_IMPLEMENTATION
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131 |
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132 | #else // !defined(__GNUC__):
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133 |
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134 | BOOST_STATIC_CONSTANT(bool, selector =
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135 | (::boost::type_traits::ice_or<
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136 | ::boost::is_arithmetic<T>::value
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137 | , ::boost::is_reference<T>::value
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138 | , is_class_or_union<T>::value
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139 | , is_array<T>::value
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140 | >::value));
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141 |
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142 | #endif
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143 |
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144 | #if BOOST_WORKAROUND(__BORLANDC__, < 0x600)
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145 | typedef ::boost::detail::is_enum_helper<
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146 | ::boost::detail::is_enum_impl<T>::selector
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147 | > se_t;
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148 | #else
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149 | typedef ::boost::detail::is_enum_helper<selector> se_t;
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150 | #endif
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151 |
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152 | typedef typename se_t::template type<T> helper;
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153 | BOOST_STATIC_CONSTANT(bool, value = helper::value);
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154 | };
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155 |
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156 | // these help on compilers with no partial specialization support:
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157 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_enum,void,false)
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158 | #ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
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159 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_enum,void const,false)
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160 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_enum,void volatile,false)
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161 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_enum,void const volatile,false)
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162 | #endif
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163 |
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164 | } // namespace detail
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165 |
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166 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_enum,T,::boost::detail::is_enum_impl<T>::value)
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167 |
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168 | #else // __BORLANDC__
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169 | //
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170 | // buggy is_convertible prevents working
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171 | // implementation of is_enum:
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172 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_enum,T,false)
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173 |
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174 | #endif
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175 |
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176 | } // namespace boost
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177 |
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178 | #include "boost/type_traits/detail/bool_trait_undef.hpp"
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179 |
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180 | #endif // BOOST_TT_IS_ENUM_HPP_INCLUDED
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