// (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_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 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_LVALUE_REFERENCE_HPP_INCLUDED | |
#define BOOST_TT_IS_LVALUE_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 | |
// 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_lvalue_reference,T,__is_reference(T)) | |
#elif !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) | |
BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_lvalue_reference,T,false) | |
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_lvalue_reference,T&,true) | |
#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_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) | |
#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_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) | |
#endif | |
#else | |
#ifdef BOOST_MSVC | |
# pragma warning(push) | |
# pragma warning(disable: 4181 4097) | |
#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_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 | |
{ | |
BOOST_STATIC_CONSTANT( | |
bool, value = sizeof( | |
::boost::detail::is_lvalue_reference_helper2( | |
::boost::detail::is_lvalue_reference_helper1(::boost::type_traits::wrap<T>()))) == 1 | |
); | |
}; | |
BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_lvalue_reference,void,false) | |
#ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS | |
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) | |
#endif | |
} // namespace detail | |
BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_lvalue_reference,T,::boost::detail::is_lvalue_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 | |