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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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