| |
| // (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 <ndnboost/type_traits/config.hpp> |
| |
| #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
| # include <ndnboost/type_traits/detail/yes_no_type.hpp> |
| # include <ndnboost/type_traits/detail/wrap.hpp> |
| #endif |
| |
| // should be the last #include |
| #include <ndnboost/type_traits/detail/bool_trait_def.hpp> |
| |
| namespace ndnboost { |
| |
| #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 ,::ndnboost::is_lvalue_reference<T>::value) |
| BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_lvalue_reference,T volatile ,::ndnboost::is_lvalue_reference<T>::value) |
| BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_lvalue_reference,T const volatile ,::ndnboost::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 ::ndnboost::type_traits::yes_type; |
| using ::ndnboost::type_traits::no_type; |
| using ::ndnboost::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( |
| ::ndnboost::detail::is_lvalue_reference_helper2( |
| ::ndnboost::detail::is_lvalue_reference_helper1(::ndnboost::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,::ndnboost::detail::is_lvalue_reference_impl<T>::value) |
| |
| #ifdef BOOST_MSVC |
| # pragma warning(pop) |
| #endif |
| |
| #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
| |
| } // namespace ndnboost |
| |
| #include <ndnboost/type_traits/detail/bool_trait_undef.hpp> |
| |
| #endif // BOOST_TT_IS_REFERENCE_HPP_INCLUDED |
| |