163 lines
5.0 KiB
C++
163 lines
5.0 KiB
C++
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// (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes,
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// Howard Hinnant and John Maddock 2000.
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// (C) Copyright Mat Marcus, Jesse Jones and Adobe Systems Inc 2001
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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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// Fixed is_pointer, is_reference, is_const, is_volatile, is_same,
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// is_member_pointer based on the Simulated Partial Specialization work
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// of Mat Marcus and Jesse Jones. See http://opensource.adobe.com or
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// http://groups.yahoo.com/group/boost/message/5441
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// Some workarounds in here use ideas suggested from "Generic<Programming>:
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// Mappings between Types and Values"
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// by Andrei Alexandrescu (see http://www.cuj.com/experts/1810/alexandr.html).
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#ifndef BOOST_TT_IS_POINTER_HPP_INCLUDED
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#define BOOST_TT_IS_POINTER_HPP_INCLUDED
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#include <boost/type_traits/is_member_pointer.hpp>
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#include <boost/type_traits/detail/ice_and.hpp>
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#include <boost/type_traits/detail/ice_not.hpp>
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#include <boost/type_traits/config.hpp>
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#if !BOOST_WORKAROUND(BOOST_MSVC,<=1300)
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#include <boost/type_traits/remove_cv.hpp>
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#endif
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#ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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# include <boost/type_traits/is_reference.hpp>
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# include <boost/type_traits/is_array.hpp>
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# include <boost/type_traits/detail/is_function_ptr_tester.hpp>
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# include <boost/type_traits/detail/false_result.hpp>
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# include <boost/type_traits/detail/ice_or.hpp>
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#endif
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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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namespace boost {
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#if defined( __CODEGEARC__ )
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BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_pointer,T,__is_pointer(T))
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#elif !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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namespace detail {
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template< typename T > struct is_pointer_helper
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{
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BOOST_STATIC_CONSTANT(bool, value = false);
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};
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# define TT_AUX_BOOL_TRAIT_HELPER_PARTIAL_SPEC(helper,sp,result) \
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template< typename T > struct helper<sp> \
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{ \
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BOOST_STATIC_CONSTANT(bool, value = result); \
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}; \
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/**/
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TT_AUX_BOOL_TRAIT_HELPER_PARTIAL_SPEC(is_pointer_helper,T*,true)
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# undef TT_AUX_BOOL_TRAIT_HELPER_PARTIAL_SPEC
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template< typename T >
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struct is_pointer_impl
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{
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#if BOOST_WORKAROUND(BOOST_MSVC,<=1300)
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BOOST_STATIC_CONSTANT(bool, value =
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(::boost::type_traits::ice_and<
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::boost::detail::is_pointer_helper<T>::value
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, ::boost::type_traits::ice_not<
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::boost::is_member_pointer<T>::value
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>::value
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>::value)
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);
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#else
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BOOST_STATIC_CONSTANT(bool, value =
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(::boost::type_traits::ice_and<
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::boost::detail::is_pointer_helper<typename remove_cv<T>::type>::value
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, ::boost::type_traits::ice_not<
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::boost::is_member_pointer<T>::value
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>::value
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>::value)
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);
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#endif
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};
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} // namespace detail
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BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_pointer,T,::boost::detail::is_pointer_impl<T>::value)
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#if defined(__BORLANDC__) && !defined(__COMO__) && (__BORLANDC__ < 0x600)
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BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_pointer,T&,false)
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BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_pointer,T& const,false)
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BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_pointer,T& volatile,false)
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BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_pointer,T& const volatile,false)
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#endif
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#else // no partial template specialization
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namespace detail {
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struct pointer_helper
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{
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pointer_helper(const volatile void*);
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};
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yes_type BOOST_TT_DECL is_pointer_tester(pointer_helper);
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no_type BOOST_TT_DECL is_pointer_tester(...);
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template <bool>
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struct is_pointer_select
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: public ::boost::type_traits::false_result
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{
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};
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template <>
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struct is_pointer_select<false>
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{
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template <typename T> struct result_
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{
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static T& make_t();
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BOOST_STATIC_CONSTANT(bool, value =
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(::boost::type_traits::ice_or<
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(1 == sizeof(is_pointer_tester(make_t()))),
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(1 == sizeof(type_traits::is_function_ptr_tester(make_t())))
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>::value));
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};
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};
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template <typename T>
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struct is_pointer_impl
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: public is_pointer_select<
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::boost::type_traits::ice_or<
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::boost::is_reference<T>::value
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, ::boost::is_array<T>::value
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>::value
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>::template result_<T>
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{
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};
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BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pointer,void,false)
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#ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
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BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pointer,void const,false)
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BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pointer,void volatile,false)
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BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pointer,void const volatile,false)
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#endif
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} // namespace detail
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BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_pointer,T,::boost::detail::is_pointer_impl<T>::value)
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#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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} // namespace boost
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#include <boost/type_traits/detail/bool_trait_undef.hpp>
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#endif // BOOST_TT_IS_POINTER_HPP_INCLUDED
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