1 | |
---|
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 |
---|
5 | |
---|
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). |
---|
9 | // |
---|
10 | // See http://www.boost.org/libs/type_traits for most recent version including documentation. |
---|
11 | |
---|
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). |
---|
19 | |
---|
20 | |
---|
21 | #ifndef BOOST_TT_IS_VOLATILE_HPP_INCLUDED |
---|
22 | #define BOOST_TT_IS_VOLATILE_HPP_INCLUDED |
---|
23 | |
---|
24 | #include <boost/config.hpp> |
---|
25 | #include <boost/detail/workaround.hpp> |
---|
26 | |
---|
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> |
---|
31 | # endif |
---|
32 | #else |
---|
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> |
---|
37 | #endif |
---|
38 | |
---|
39 | // should be the last #include |
---|
40 | #include <boost/type_traits/detail/bool_trait_def.hpp> |
---|
41 | |
---|
42 | namespace boost { |
---|
43 | |
---|
44 | namespace detail{ |
---|
45 | template <class T> |
---|
46 | struct is_volatile_rval_filter |
---|
47 | { |
---|
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); |
---|
50 | #else |
---|
51 | BOOST_STATIC_CONSTANT(bool, value = ::boost::detail::cv_traits_imp<T*>::is_volatile); |
---|
52 | #endif |
---|
53 | }; |
---|
54 | #ifndef BOOST_NO_RVALUE_REFERENCES |
---|
55 | // |
---|
56 | // We can't filter out rvalue_references at the same level as |
---|
57 | // references or we get ambiguities from msvc: |
---|
58 | // |
---|
59 | template <class T> |
---|
60 | struct is_volatile_rval_filter<T&&> |
---|
61 | { |
---|
62 | BOOST_STATIC_CONSTANT(bool, value = false); |
---|
63 | }; |
---|
64 | #endif |
---|
65 | } |
---|
66 | |
---|
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) |
---|
70 | |
---|
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) |
---|
74 | |
---|
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) |
---|
83 | #endif |
---|
84 | |
---|
85 | #else |
---|
86 | |
---|
87 | namespace detail { |
---|
88 | |
---|
89 | using ::boost::type_traits::yes_type; |
---|
90 | using ::boost::type_traits::no_type; |
---|
91 | |
---|
92 | yes_type is_volatile_tester(void const volatile*); |
---|
93 | no_type is_volatile_tester(void const*); |
---|
94 | |
---|
95 | template <bool is_ref, bool array> |
---|
96 | struct is_volatile_helper |
---|
97 | : ::boost::type_traits::false_result |
---|
98 | { |
---|
99 | }; |
---|
100 | |
---|
101 | template <> |
---|
102 | struct is_volatile_helper<false,false> |
---|
103 | { |
---|
104 | template <typename T> struct result_ |
---|
105 | { |
---|
106 | static T* t; |
---|
107 | BOOST_STATIC_CONSTANT(bool, value = ( |
---|
108 | sizeof(boost::detail::yes_type) == sizeof(boost::detail::is_volatile_tester(t)) |
---|
109 | )); |
---|
110 | }; |
---|
111 | }; |
---|
112 | |
---|
113 | template <> |
---|
114 | struct is_volatile_helper<false,true> |
---|
115 | { |
---|
116 | template <typename T> struct result_ |
---|
117 | { |
---|
118 | static T t; |
---|
119 | BOOST_STATIC_CONSTANT(bool, value = ( |
---|
120 | sizeof(boost::detail::yes_type) == sizeof(boost::detail::is_volatile_tester(&t)) |
---|
121 | )); |
---|
122 | }; |
---|
123 | }; |
---|
124 | |
---|
125 | template <typename T> |
---|
126 | struct is_volatile_impl |
---|
127 | : is_volatile_helper< |
---|
128 | is_reference<T>::value |
---|
129 | , is_array<T>::value |
---|
130 | >::template result_<T> |
---|
131 | { |
---|
132 | }; |
---|
133 | |
---|
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) |
---|
139 | #endif |
---|
140 | |
---|
141 | } // namespace detail |
---|
142 | |
---|
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) |
---|
145 | |
---|
146 | #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
---|
147 | |
---|
148 | } // namespace boost |
---|
149 | |
---|
150 | #include <boost/type_traits/detail/bool_trait_undef.hpp> |
---|
151 | |
---|
152 | #endif // BOOST_TT_IS_VOLATILE_HPP_INCLUDED |
---|