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Viewing changes to boost/boost/type_traits/is_reference.hpp

  • Committer: Bazaar Package Importer
  • Author(s): LaMont Jones
  • Date: 2004-08-24 07:25:04 UTC
  • Revision ID: james.westby@ubuntu.com-20040824072504-zf993vnevvisdsvb
Tags: upstream-0.9.1
Import upstream version 0.9.1

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