[857] | 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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