[857] | 1 |
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| 2 | // (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes,
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| 3 | // Howard Hinnant and John Maddock 2000.
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| 4 | // (C) Copyright Mat Marcus, Jesse Jones and Adobe Systems Inc 2001
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| 5 |
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| 6 | // Use, modification and distribution are subject to the Boost Software License,
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| 7 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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| 8 | // http://www.boost.org/LICENSE_1_0.txt).
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| 9 | //
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| 10 | // See http://www.boost.org/libs/type_traits for most recent version including documentation.
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| 11 |
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| 12 | // Fixed is_pointer, is_reference, is_const, is_volatile, is_same,
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| 13 | // is_member_pointer based on the Simulated Partial Specialization work
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| 14 | // of Mat Marcus and Jesse Jones. See http://opensource.adobe.com or
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| 15 | // http://groups.yahoo.com/group/boost/message/5441
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| 16 | // Some workarounds in here use ideas suggested from "Generic<Programming>:
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| 17 | // Mappings between Types and Values"
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| 18 | // by Andrei Alexandrescu (see http://www.cuj.com/experts/1810/alexandr.html).
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| 19 |
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| 20 |
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| 21 | #ifndef BOOST_TT_IS_REFERENCE_HPP_INCLUDED
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| 22 | #define BOOST_TT_IS_REFERENCE_HPP_INCLUDED
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| 23 |
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| 24 | #include "boost/type_traits/config.hpp"
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| 25 |
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| 26 | #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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| 27 | # include "boost/type_traits/detail/yes_no_type.hpp"
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| 28 | # include "boost/type_traits/detail/wrap.hpp"
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| 29 | #endif
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| 30 |
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| 31 | // should be the last #include
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| 32 | #include "boost/type_traits/detail/bool_trait_def.hpp"
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| 33 |
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| 34 | namespace boost {
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| 35 |
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| 36 | #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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| 37 |
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| 38 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_reference,T,false)
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| 39 | BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_reference,T&,true)
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| 40 |
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| 41 | #if defined(__BORLANDC__) && !defined(__COMO__) && (__BORLANDC__ < 0x600)
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| 42 | // these are illegal specialisations; cv-qualifies applied to
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| 43 | // references have no effect according to [8.3.2p1],
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| 44 | // C++ Builder requires them though as it treats cv-qualified
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| 45 | // references as distinct types...
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| 46 | BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_reference,T& const,true)
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| 47 | BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_reference,T& volatile,true)
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| 48 | BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_reference,T& const volatile,true)
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| 49 | #endif
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| 50 |
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| 51 | #if defined(__GNUC__) && (__GNUC__ < 3)
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| 52 | // these allow us to work around illegally cv-qualified reference
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| 53 | // types.
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| 54 | BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_reference,T const ,::boost::is_reference<T>::value)
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| 55 | BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_reference,T volatile ,::boost::is_reference<T>::value)
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| 56 | BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_reference,T const volatile ,::boost::is_reference<T>::value)
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| 57 | // However, the above specializations confuse gcc 2.96 unless we also
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| 58 | // supply these specializations for array types
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| 59 | BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_2(typename T,unsigned long N,is_reference,T[N],false)
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| 60 | BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_2(typename T,unsigned long N,is_reference,const T[N],false)
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| 61 | BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_2(typename T,unsigned long N,is_reference,volatile T[N],false)
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| 62 | BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_2(typename T,unsigned long N,is_reference,const volatile T[N],false)
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| 63 | #endif
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| 64 |
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| 65 | #else
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| 66 |
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| 67 | #ifdef BOOST_MSVC
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| 68 | # pragma warning(push)
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| 69 | # pragma warning(disable: 4181)
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| 70 | #endif
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| 71 |
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| 72 | namespace detail {
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| 73 |
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| 74 | using ::boost::type_traits::yes_type;
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| 75 | using ::boost::type_traits::no_type;
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| 76 | using ::boost::type_traits::wrap;
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| 77 |
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| 78 | template <class T> T&(* is_reference_helper1(wrap<T>) )(wrap<T>);
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| 79 | char is_reference_helper1(...);
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| 80 |
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| 81 | template <class T> no_type is_reference_helper2(T&(*)(wrap<T>));
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| 82 | yes_type is_reference_helper2(...);
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| 83 |
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| 84 | template <typename T>
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| 85 | struct is_reference_impl
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| 86 | {
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| 87 | BOOST_STATIC_CONSTANT(
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| 88 | bool, value = sizeof(
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| 89 | ::boost::detail::is_reference_helper2(
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| 90 | ::boost::detail::is_reference_helper1(::boost::type_traits::wrap<T>()))) == 1
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| 91 | );
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| 92 | };
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| 93 |
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| 94 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_reference,void,false)
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| 95 | #ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
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| 96 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_reference,void const,false)
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| 97 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_reference,void volatile,false)
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| 98 | BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_reference,void const volatile,false)
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| 99 | #endif
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| 100 |
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| 101 | } // namespace detail
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| 102 |
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| 103 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_reference,T,::boost::detail::is_reference_impl<T>::value)
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| 104 |
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| 105 | #ifdef BOOST_MSVC
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| 106 | # pragma warning(pop)
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| 107 | #endif
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| 108 |
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| 109 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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| 110 |
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| 111 | } // namespace boost
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| 112 |
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| 113 | #include "boost/type_traits/detail/bool_trait_undef.hpp"
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| 114 |
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| 115 | #endif // BOOST_TT_IS_REFERENCE_HPP_INCLUDED
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| 116 |
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