GL Profile Suite / boost_1_51_0 / boost / type_traits / is_lvalue_reference.hpp

//  (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
//  See for most recent version including documentation.

//    Fixed is_pointer, is_lvalue_reference, is_const, is_volatile, is_same, 
//    is_member_pointer based on the Simulated Partial Specialization work 
//    of Mat Marcus and Jesse Jones. See or 
//    Some workarounds in here use ideas suggested from "Generic<Programming>: 
//    Mappings between Types and Values" 
//    by Andrei Alexandrescu (see


#include <boost/type_traits/config.hpp>

#   include <boost/type_traits/detail/yes_no_type.hpp>
#   include <boost/type_traits/detail/wrap.hpp>

// should be the last #include
#include <boost/type_traits/detail/bool_trait_def.hpp>

namespace boost {

#if defined( __CODEGEARC__ )

BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_lvalue_reference,T&,true)

// 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_lvalue_reference,T& const,true)
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_lvalue_reference,T& volatile,true)
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_lvalue_reference,T& const volatile,true)

#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_lvalue_reference,T const ,::boost::is_lvalue_reference<T>::value)
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_lvalue_reference,T volatile ,::boost::is_lvalue_reference<T>::value)
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_lvalue_reference,T const volatile ,::boost::is_lvalue_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_lvalue_reference,T[N],false)
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_2(typename T,unsigned long N,is_lvalue_reference,const T[N],false)
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_2(typename T,unsigned long N,is_lvalue_reference,volatile T[N],false)
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_2(typename T,unsigned long N,is_lvalue_reference,const volatile T[N],false)


#   pragma warning(push)
#   pragma warning(disable: 4181 4097)

namespace detail {

using ::boost::type_traits::yes_type;
using ::boost::type_traits::no_type;
using ::boost::type_traits::wrap;

template <class T> T&(* is_lvalue_reference_helper1(wrap<T>) )(wrap<T>);
char is_lvalue_reference_helper1(...);

template <class T> no_type is_lvalue_reference_helper2(T&(*)(wrap<T>));
yes_type is_lvalue_reference_helper2(...);

template <typename T>
struct is_lvalue_reference_impl
        bool, value = sizeof(
                ::boost::detail::is_lvalue_reference_helper1(::boost::type_traits::wrap<T>()))) == 1

BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_lvalue_reference,void const,false)
BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_lvalue_reference,void volatile,false)
BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_lvalue_reference,void const volatile,false)

} // namespace detail


#   pragma warning(pop)


} // namespace boost

#include <boost/type_traits/detail/bool_trait_undef.hpp>

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