119 lines
4.6 KiB
C++
119 lines
4.6 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_lvalue_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_LVALUE_REFERENCE_HPP_INCLUDED
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#define BOOST_TT_IS_LVALUE_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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// 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_lvalue_reference,T,__is_reference(T))
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#elif !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_lvalue_reference,T,false)
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BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_lvalue_reference,T&,true)
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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_lvalue_reference,T& const,true)
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BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_lvalue_reference,T& volatile,true)
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BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_lvalue_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_lvalue_reference,T const ,::boost::is_lvalue_reference<T>::value)
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BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_lvalue_reference,T volatile ,::boost::is_lvalue_reference<T>::value)
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BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_lvalue_reference,T const volatile ,::boost::is_lvalue_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_lvalue_reference,T[N],false)
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BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_2(typename T,unsigned long N,is_lvalue_reference,const T[N],false)
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BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_2(typename T,unsigned long N,is_lvalue_reference,volatile T[N],false)
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BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_2(typename T,unsigned long N,is_lvalue_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 4097)
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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_lvalue_reference_helper1(wrap<T>) )(wrap<T>);
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char is_lvalue_reference_helper1(...);
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template <class T> no_type is_lvalue_reference_helper2(T&(*)(wrap<T>));
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yes_type is_lvalue_reference_helper2(...);
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template <typename T>
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struct is_lvalue_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_lvalue_reference_helper2(
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::boost::detail::is_lvalue_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_lvalue_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_lvalue_reference,void const,false)
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BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_lvalue_reference,void volatile,false)
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BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_lvalue_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_lvalue_reference,T,::boost::detail::is_lvalue_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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