// (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, | |
// Howard Hinnant and John Maddock 2000. | |
// (C) Copyright Mat Marcus, Jesse Jones and Adobe Systems Inc 2001 | |
// Use, modification and distribution are subject to the Boost Software License, | |
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
// http://www.boost.org/LICENSE_1_0.txt). | |
// | |
// See http://www.boost.org/libs/type_traits for most recent version including documentation. | |
// Fixed is_pointer, is_reference, is_const, is_volatile, is_same, | |
// is_member_pointer based on the Simulated Partial Specialization work | |
// of Mat Marcus and Jesse Jones. See http://opensource.adobe.com or | |
// http://groups.yahoo.com/group/boost/message/5441 | |
// Some workarounds in here use ideas suggested from "Generic<Programming>: | |
// Mappings between Types and Values" | |
// by Andrei Alexandrescu (see http://www.cuj.com/experts/1810/alexandr.html). | |
#ifndef BOOST_TT_IS_CONST_HPP_INCLUDED | |
#define BOOST_TT_IS_CONST_HPP_INCLUDED | |
#include <boost/config.hpp> | |
#include <boost/detail/workaround.hpp> | |
#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION | |
# include <boost/type_traits/detail/cv_traits_impl.hpp> | |
# ifdef __GNUC__ | |
# include <boost/type_traits/is_reference.hpp> | |
# endif | |
# if BOOST_WORKAROUND(BOOST_MSVC, < 1400) | |
# include <boost/type_traits/remove_bounds.hpp> | |
# endif | |
#else | |
# include <boost/type_traits/is_reference.hpp> | |
# include <boost/type_traits/is_array.hpp> | |
# include <boost/type_traits/detail/yes_no_type.hpp> | |
# include <boost/type_traits/detail/false_result.hpp> | |
#endif | |
// should be the last #include | |
#include <boost/type_traits/detail/bool_trait_def.hpp> | |
namespace boost { | |
#if defined( __CODEGEARC__ ) | |
BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_const,T,__is_const(T)) | |
#elif !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) | |
namespace detail{ | |
// | |
// We can't filter out rvalue_references at the same level as | |
// references or we get ambiguities from msvc: | |
// | |
template <class T> | |
struct is_const_rvalue_filter | |
{ | |
#if BOOST_WORKAROUND(BOOST_MSVC, < 1400) | |
BOOST_STATIC_CONSTANT(bool, value = ::boost::detail::cv_traits_imp<typename boost::remove_bounds<T>::type*>::is_const); | |
#else | |
BOOST_STATIC_CONSTANT(bool, value = ::boost::detail::cv_traits_imp<T*>::is_const); | |
#endif | |
}; | |
#ifndef BOOST_NO_RVALUE_REFERENCES | |
template <class T> | |
struct is_const_rvalue_filter<T&&> | |
{ | |
BOOST_STATIC_CONSTANT(bool, value = false); | |
}; | |
#endif | |
} | |
//* is a type T declared const - is_const<T> | |
BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_const,T,::boost::detail::is_const_rvalue_filter<T>::value) | |
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_const,T&,false) | |
#if defined(BOOST_ILLEGAL_CV_REFERENCES) | |
// these are illegal specialisations; cv-qualifies applied to | |
// references have no effect according to [8.3.2p1], | |
// C++ Builder requires them though as it treats cv-qualified | |
// references as distinct types... | |
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_const,T& const,false) | |
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_const,T& volatile,false) | |
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_const,T& const volatile,false) | |
#endif | |
#if defined(__GNUC__) && (__GNUC__ < 3) | |
// special case for gcc where illegally cv-qualified reference types can be | |
// generated in some corner cases: | |
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_const,T const,!(::boost::is_reference<T>::value)) | |
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_const,T volatile const,!(::boost::is_reference<T>::value)) | |
#endif | |
#else | |
namespace detail { | |
using ::boost::type_traits::yes_type; | |
using ::boost::type_traits::no_type; | |
yes_type is_const_tester(const volatile void*); | |
no_type is_const_tester(volatile void *); | |
template <bool is_ref, bool array> | |
struct is_const_helper | |
: ::boost::type_traits::false_result | |
{ | |
}; | |
template <> | |
struct is_const_helper<false,false> | |
{ | |
template <typename T> struct result_ | |
{ | |
static T* t; | |
BOOST_STATIC_CONSTANT(bool, value = ( | |
sizeof(boost::detail::yes_type) == sizeof(boost::detail::is_const_tester(t)) | |
)); | |
}; | |
}; | |
template <> | |
struct is_const_helper<false,true> | |
{ | |
template <typename T> struct result_ | |
{ | |
static T t; | |
BOOST_STATIC_CONSTANT(bool, value = ( | |
sizeof(boost::detail::yes_type) == sizeof(boost::detail::is_const_tester(&t)) | |
)); | |
}; | |
}; | |
template <typename T> | |
struct is_const_impl | |
: is_const_helper< | |
is_reference<T>::value | |
, is_array<T>::value | |
>::template result_<T> | |
{ | |
}; | |
BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_const,void,false) | |
#ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS | |
BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_const,void const,true) | |
BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_const,void volatile,false) | |
BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_const,void const volatile,true) | |
#endif | |
} // namespace detail | |
//* is a type T declared const - is_const<T> | |
BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_const,T,::boost::detail::is_const_impl<T>::value) | |
#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION | |
} // namespace boost | |
#include <boost/type_traits/detail/bool_trait_undef.hpp> | |
#endif // BOOST_TT_IS_CONST_HPP_INCLUDED | |