2 // (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes,
3 // Howard Hinnant and John Maddock 2000.
4 // (C) Copyright Mat Marcus, Jesse Jones and Adobe Systems Inc 2001
6 // Use, modification and distribution are subject to the Boost Software License,
7 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
8 // http://www.boost.org/LICENSE_1_0.txt).
10 // See http://www.boost.org/libs/type_traits for most recent version including documentation.
12 // Fixed is_pointer, is_reference, is_const, is_volatile, is_same,
13 // is_member_pointer based on the Simulated Partial Specialization work
14 // of Mat Marcus and Jesse Jones. See http://opensource.adobe.com or
15 // http://groups.yahoo.com/group/boost/message/5441
16 // Some workarounds in here use ideas suggested from "Generic<Programming>:
17 // Mappings between Types and Values"
18 // by Andrei Alexandrescu (see http://www.cuj.com/experts/1810/alexandr.html).
21 #ifndef BOOST_TT_IS_VOLATILE_HPP_INCLUDED
22 #define BOOST_TT_IS_VOLATILE_HPP_INCLUDED
24 #include <boost/config.hpp>
25 #include <boost/detail/workaround.hpp>
27 #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
28 # include <boost/type_traits/detail/cv_traits_impl.hpp>
29 # if BOOST_WORKAROUND(BOOST_MSVC, < 1400)
30 # include <boost/type_traits/remove_bounds.hpp>
33 # include <boost/type_traits/is_reference.hpp>
34 # include <boost/type_traits/is_array.hpp>
35 # include <boost/type_traits/detail/yes_no_type.hpp>
36 # include <boost/type_traits/detail/false_result.hpp>
39 // should be the last #include
40 #include <boost/type_traits/detail/bool_trait_def.hpp>
46 struct is_volatile_rval_filter
48 #if BOOST_WORKAROUND(BOOST_MSVC, < 1400)
49 BOOST_STATIC_CONSTANT(bool, value = ::boost::detail::cv_traits_imp<typename boost::remove_bounds<T>::type*>::is_volatile);
51 BOOST_STATIC_CONSTANT(bool, value = ::boost::detail::cv_traits_imp<T*>::is_volatile);
54 #ifndef BOOST_NO_RVALUE_REFERENCES
56 // We can't filter out rvalue_references at the same level as
57 // references or we get ambiguities from msvc:
60 struct is_volatile_rval_filter<T&&>
62 BOOST_STATIC_CONSTANT(bool, value = false);
67 #if defined( __CODEGEARC__ )
68 BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_volatile,T,__is_volatile(T))
69 #elif !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
71 //* is a type T declared volatile - is_volatile<T>
72 BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_volatile,T,::boost::detail::is_volatile_rval_filter<T>::value)
73 BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_volatile,T&,false)
75 #if defined(BOOST_ILLEGAL_CV_REFERENCES)
76 // these are illegal specialisations; cv-qualifies applied to
77 // references have no effect according to [8.3.2p1],
78 // C++ Builder requires them though as it treats cv-qualified
79 // references as distinct types...
80 BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_volatile,T& const,false)
81 BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_volatile,T& volatile,false)
82 BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_volatile,T& const volatile,false)
89 using ::boost::type_traits::yes_type;
90 using ::boost::type_traits::no_type;
92 yes_type is_volatile_tester(void const volatile*);
93 no_type is_volatile_tester(void const*);
95 template <bool is_ref, bool array>
96 struct is_volatile_helper
97 : ::boost::type_traits::false_result
102 struct is_volatile_helper<false,false>
104 template <typename T> struct result_
107 BOOST_STATIC_CONSTANT(bool, value = (
108 sizeof(boost::detail::yes_type) == sizeof(boost::detail::is_volatile_tester(t))
114 struct is_volatile_helper<false,true>
116 template <typename T> struct result_
119 BOOST_STATIC_CONSTANT(bool, value = (
120 sizeof(boost::detail::yes_type) == sizeof(boost::detail::is_volatile_tester(&t))
125 template <typename T>
126 struct is_volatile_impl
127 : is_volatile_helper<
128 is_reference<T>::value
130 >::template result_<T>
134 BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_volatile,void,false)
135 #ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
136 BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_volatile,void const,false)
137 BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_volatile,void volatile,true)
138 BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_volatile,void const volatile,true)
141 } // namespace detail
143 //* is a type T declared volatile - is_volatile<T>
144 BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_volatile,T,::boost::detail::is_volatile_impl<T>::value)
146 #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
150 #include <boost/type_traits/detail/bool_trait_undef.hpp>
152 #endif // BOOST_TT_IS_VOLATILE_HPP_INCLUDED