166 lines
5.1 KiB
C++
166 lines
5.1 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_CONST_HPP_INCLUDED
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#define BOOST_TT_IS_CONST_HPP_INCLUDED
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#include <boost/config.hpp>
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#include <boost/detail/workaround.hpp>
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#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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# include <boost/type_traits/detail/cv_traits_impl.hpp>
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# ifdef __GNUC__
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# include <boost/type_traits/is_reference.hpp>
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# endif
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# if BOOST_WORKAROUND(BOOST_MSVC, < 1400)
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# include <boost/type_traits/remove_bounds.hpp>
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# endif
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#else
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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/yes_no_type.hpp>
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# include <boost/type_traits/detail/false_result.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_const,T,__is_const(T))
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#elif !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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namespace detail{
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//
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// We can't filter out rvalue_references at the same level as
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// references or we get ambiguities from msvc:
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//
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template <class T>
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struct is_const_rvalue_filter
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{
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#if BOOST_WORKAROUND(BOOST_MSVC, < 1400)
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BOOST_STATIC_CONSTANT(bool, value = ::boost::detail::cv_traits_imp<typename boost::remove_bounds<T>::type*>::is_const);
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#else
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BOOST_STATIC_CONSTANT(bool, value = ::boost::detail::cv_traits_imp<T*>::is_const);
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#endif
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};
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#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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template <class T>
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struct is_const_rvalue_filter<T&&>
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{
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BOOST_STATIC_CONSTANT(bool, value = false);
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};
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#endif
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}
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//* is a type T declared const - is_const<T>
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BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_const,T,::boost::detail::is_const_rvalue_filter<T>::value)
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BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_const,T&,false)
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#if defined(BOOST_ILLEGAL_CV_REFERENCES)
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// these are illegal specialisations; cv-qualifies applied to
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// references have no effect according to [8.3.2p1],
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// C++ Builder requires them though as it treats cv-qualified
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// references as distinct types...
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BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_const,T& const,false)
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BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_const,T& volatile,false)
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BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_const,T& const volatile,false)
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#endif
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#if defined(__GNUC__) && (__GNUC__ < 3)
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// special case for gcc where illegally cv-qualified reference types can be
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// generated in some corner cases:
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BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_const,T const,!(::boost::is_reference<T>::value))
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BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_const,T volatile const,!(::boost::is_reference<T>::value))
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#endif
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#else
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namespace detail {
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using ::boost::type_traits::yes_type;
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using ::boost::type_traits::no_type;
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yes_type is_const_tester(const volatile void*);
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no_type is_const_tester(volatile void *);
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template <bool is_ref, bool array>
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struct is_const_helper
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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_const_helper<false,false>
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{
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template <typename T> struct result_
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{
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static T* t;
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BOOST_STATIC_CONSTANT(bool, value = (
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sizeof(boost::detail::yes_type) == sizeof(boost::detail::is_const_tester(t))
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));
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};
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};
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template <>
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struct is_const_helper<false,true>
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{
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template <typename T> struct result_
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{
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static T t;
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BOOST_STATIC_CONSTANT(bool, value = (
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sizeof(boost::detail::yes_type) == sizeof(boost::detail::is_const_tester(&t))
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));
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};
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};
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template <typename T>
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struct is_const_impl
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: public is_const_helper<
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is_reference<T>::value
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, is_array<T>::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_const,void,false)
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#ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
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BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_const,void const,true)
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BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_const,void volatile,false)
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BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_const,void const volatile,true)
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#endif
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} // namespace detail
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//* is a type T declared const - is_const<T>
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BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_const,T,::boost::detail::is_const_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_CONST_HPP_INCLUDED
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