// (C) Copyright David Abrahams Steve Cleary, Beman Dawes, Howard
// Hinnant & John Maddock 2000-2002. Permission to copy, use,
// modify, sell and distribute this software is granted provided this
// copyright notice appears in all copies. This software is provided
// "as is" without express or implied warranty, and with no claim as
// to its suitability for any purpose.
//
// See http://www.boost.org for most recent version including documentation.
#ifndef BOOST_TT_IS_REFERENCE_HPP_INCLUDED
#define BOOST_TT_IS_REFERENCE_HPP_INCLUDED
#include "boost/type_traits/config.hpp"
#ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
# include "boost/type_traits/detail/yes_no_type.hpp"
# include "boost/type_traits/detail/wrap.hpp"
#endif
#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) && defined(BOOST_MSVC)
# include "boost/type_traits/detail/is_function_type_tester.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 {
#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_reference,T,false)
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_reference,T&,true)
#if defined(__BORLANDC__) && !defined(__COMO__)
// 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_reference,T& const,true)
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_reference,T& volatile,true)
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_reference,T& const volatile,true)
#endif
#if defined(__GNUC__) && (__GNUC__ < 3)
// these allow us to work around illegally cv-qualified reference
// types.
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_reference,T const ,::boost::is_reference<T>::value)
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_reference,T volatile ,::boost::is_reference<T>::value)
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_reference,T const volatile ,::boost::is_reference<T>::value)
// However, the above specializations confuse gcc 2.96 unless we also
// supply these specializations for array types
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_2(typename T,unsigned long N,is_reference,T[N],false)
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_2(typename T,unsigned long N,is_reference,const T[N],false)
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_2(typename T,unsigned long N,is_reference,volatile T[N],false)
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_2(typename T,unsigned long N,is_reference,const volatile T[N],false)
#endif
#else
#ifdef BOOST_MSVC
# pragma warning(push)
# pragma warning(disable: 4181)
#endif
namespace detail {
using ::boost::type_traits::yes_type;
using ::boost::type_traits::no_type;
using ::boost::type_traits::wrap;
template <class T> T&(* is_reference_helper1(wrap<T>) )(wrap<T>);
char is_reference_helper1(...);
template <class T> no_type is_reference_helper2(T&(*)(wrap<T>));
yes_type is_reference_helper2(...);
template <typename T>
struct is_reference_impl
{
BOOST_STATIC_CONSTANT(
bool, value = sizeof(
::boost::detail::is_reference_helper2(
::boost::detail::is_reference_helper1(::boost::type_traits::wrap<T>()))) == 1
);
};
BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_reference,void,false)
#ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_reference,void const,false)
BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_reference,void volatile,false)
BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_reference,void const volatile,false)
#endif
} // namespace detail
BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_reference,T,::boost::detail::is_reference_impl<T>::value)
#ifdef BOOST_MSVC
# pragma warning(pop)
#endif
#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
} // namespace boost
#include "boost/type_traits/detail/bool_trait_undef.hpp"
#endif // BOOST_TT_IS_REFERENCE_HPP_INCLUDED