1 | |
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2 | // (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000. |
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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 | #ifndef BOOST_TT_IS_POD_HPP_INCLUDED |
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10 | #define BOOST_TT_IS_POD_HPP_INCLUDED |
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11 | |
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12 | #include <boost/type_traits/config.hpp> |
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13 | #include <boost/type_traits/is_void.hpp> |
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14 | #include <boost/type_traits/is_scalar.hpp> |
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15 | #include <boost/type_traits/detail/ice_or.hpp> |
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16 | #include <boost/type_traits/intrinsics.hpp> |
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17 | |
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18 | #include <cstddef> |
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19 | |
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20 | // should be the last #include |
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21 | #include <boost/type_traits/detail/bool_trait_def.hpp> |
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22 | |
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23 | namespace boost { |
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24 | |
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25 | // forward declaration, needed by 'is_pod_array_helper' template below |
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26 | template< typename T > struct is_POD; |
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27 | |
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28 | namespace detail { |
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29 | |
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30 | #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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31 | |
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32 | template <typename T> struct is_pod_impl |
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33 | { |
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34 | BOOST_STATIC_CONSTANT( |
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35 | bool, value = |
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36 | (::boost::type_traits::ice_or< |
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37 | ::boost::is_scalar<T>::value, |
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38 | ::boost::is_void<T>::value, |
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39 | BOOST_IS_POD(T) |
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40 | >::value)); |
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41 | }; |
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42 | |
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43 | #if !defined(BOOST_NO_ARRAY_TYPE_SPECIALIZATIONS) |
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44 | template <typename T, std::size_t sz> |
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45 | struct is_pod_impl<T[sz]> |
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46 | : is_pod_impl<T> |
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47 | { |
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48 | }; |
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49 | #endif |
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50 | |
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51 | #else |
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52 | |
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53 | template <bool is_array = false> |
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54 | struct is_pod_helper |
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55 | { |
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56 | template <typename T> struct result_ |
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57 | { |
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58 | BOOST_STATIC_CONSTANT( |
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59 | bool, value = |
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60 | (::boost::type_traits::ice_or< |
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61 | ::boost::is_scalar<T>::value, |
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62 | ::boost::is_void<T>::value, |
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63 | BOOST_IS_POD(T) |
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64 | >::value)); |
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65 | }; |
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66 | }; |
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67 | |
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68 | template <bool b> |
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69 | struct bool_to_yes_no_type |
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70 | { |
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71 | typedef ::boost::type_traits::no_type type; |
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72 | }; |
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73 | |
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74 | template <> |
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75 | struct bool_to_yes_no_type<true> |
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76 | { |
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77 | typedef ::boost::type_traits::yes_type type; |
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78 | }; |
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79 | |
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80 | template <typename ArrayType> |
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81 | struct is_pod_array_helper |
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82 | { |
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83 | enum { is_pod = ::boost::is_POD<ArrayType>::value }; // MSVC workaround |
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84 | typedef typename bool_to_yes_no_type<is_pod>::type type; |
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85 | type instance() const; |
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86 | }; |
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87 | |
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88 | template <typename T> |
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89 | is_pod_array_helper<T> is_POD_array(T*); |
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90 | |
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91 | template <> |
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92 | struct is_pod_helper<true> |
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93 | { |
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94 | template <typename T> struct result_ |
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95 | { |
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96 | static T& help(); |
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97 | BOOST_STATIC_CONSTANT(bool, value = |
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98 | sizeof(is_POD_array(help()).instance()) == sizeof(::boost::type_traits::yes_type) |
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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 | |
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104 | template <typename T> struct is_pod_impl |
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105 | { |
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106 | BOOST_STATIC_CONSTANT( |
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107 | bool, value = ( |
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108 | ::boost::detail::is_pod_helper< |
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109 | ::boost::is_array<T>::value |
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110 | >::template result_<T>::value |
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111 | ) |
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112 | ); |
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113 | }; |
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114 | |
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115 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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116 | |
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117 | // the following help compilers without partial specialization support: |
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118 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,void,true) |
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119 | |
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120 | #ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS |
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121 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,void const,true) |
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122 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,void volatile,true) |
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123 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,void const volatile,true) |
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124 | #endif |
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125 | |
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126 | } // namespace detail |
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127 | |
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128 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_POD,T,::boost::detail::is_pod_impl<T>::value) |
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129 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_pod,T,::boost::detail::is_pod_impl<T>::value) |
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130 | |
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131 | } // namespace boost |
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132 | |
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133 | #include <boost/type_traits/detail/bool_trait_undef.hpp> |
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134 | |
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135 | #endif // BOOST_TT_IS_POD_HPP_INCLUDED |
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