146 lines
3.7 KiB
C++
146 lines
3.7 KiB
C++
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// (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
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// Use, modification and distribution are subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt).
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//
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// See http://www.boost.org/libs/type_traits for most recent version including documentation.
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#ifndef BOOST_TT_IS_POD_HPP_INCLUDED
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#define BOOST_TT_IS_POD_HPP_INCLUDED
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#include <boost/type_traits/config.hpp>
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#include <boost/type_traits/is_void.hpp>
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#include <boost/type_traits/is_scalar.hpp>
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#include <boost/type_traits/detail/ice_or.hpp>
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#include <boost/type_traits/intrinsics.hpp>
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#include <cstddef>
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// should be the last #include
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#include <boost/type_traits/detail/bool_trait_def.hpp>
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#ifndef BOOST_IS_POD
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#define BOOST_INTERNAL_IS_POD(T) false
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#else
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#define BOOST_INTERNAL_IS_POD(T) BOOST_IS_POD(T)
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#endif
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namespace boost {
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// forward declaration, needed by 'is_pod_array_helper' template below
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template< typename T > struct is_POD;
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namespace detail {
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#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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template <typename T> struct is_pod_impl
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{
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BOOST_STATIC_CONSTANT(
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bool, value =
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(::boost::type_traits::ice_or<
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::boost::is_scalar<T>::value,
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::boost::is_void<T>::value,
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BOOST_INTERNAL_IS_POD(T)
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>::value));
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};
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#if !defined(BOOST_NO_ARRAY_TYPE_SPECIALIZATIONS)
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template <typename T, std::size_t sz>
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struct is_pod_impl<T[sz]>
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: public is_pod_impl<T>
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{
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};
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#endif
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#else
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template <bool is_array = false>
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struct is_pod_helper
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{
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template <typename T> struct result_
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{
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BOOST_STATIC_CONSTANT(
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bool, value =
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(::boost::type_traits::ice_or<
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::boost::is_scalar<T>::value,
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::boost::is_void<T>::value,
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BOOST_INTERNAL_IS_POD(T)
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>::value));
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};
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};
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template <bool b>
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struct bool_to_yes_no_type
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{
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typedef ::boost::type_traits::no_type type;
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};
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template <>
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struct bool_to_yes_no_type<true>
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{
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typedef ::boost::type_traits::yes_type type;
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};
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template <typename ArrayType>
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struct is_pod_array_helper
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{
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enum { is_pod = ::boost::is_POD<ArrayType>::value }; // MSVC workaround
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typedef typename bool_to_yes_no_type<is_pod>::type type;
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type instance() const;
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};
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template <typename T>
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is_pod_array_helper<T> is_POD_array(T*);
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template <>
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struct is_pod_helper<true>
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{
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template <typename T> struct result_
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{
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static T& help();
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BOOST_STATIC_CONSTANT(bool, value =
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sizeof(is_POD_array(help()).instance()) == sizeof(::boost::type_traits::yes_type)
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);
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};
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};
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template <typename T> struct is_pod_impl
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{
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BOOST_STATIC_CONSTANT(
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bool, value = (
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::boost::detail::is_pod_helper<
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::boost::is_array<T>::value
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>::template result_<T>::value
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)
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);
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};
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#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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// the following help compilers without partial specialization support:
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BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,void,true)
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#ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
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BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,void const,true)
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BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,void volatile,true)
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BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pod,void const volatile,true)
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#endif
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} // namespace detail
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BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_pod,T,::boost::detail::is_pod_impl<T>::value)
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// is_POD is the old depricated name for this trait, do not use this as it may
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// be removed in future without warning!!
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BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_POD,T,::boost::is_pod<T>::value)
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} // namespace boost
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#include <boost/type_traits/detail/bool_trait_undef.hpp>
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#undef BOOST_INTERNAL_IS_POD
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#endif // BOOST_TT_IS_POD_HPP_INCLUDED
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