1 /////////////////////////////////////////////////////////////////////////////
2 //
3 // (C) Copyright Ion Gaztanaga        2006-2014
4 // (C) Copyright Microsoft Corporation  2014
5 //
6 // Distributed under the Boost Software License, Version 1.0.
7 //    (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/intrusive for documentation.
11 //
12 /////////////////////////////////////////////////////////////////////////////
13 
14 #ifndef BOOST_INTRUSIVE_DETAIL_MPL_HPP
15 #define BOOST_INTRUSIVE_DETAIL_MPL_HPP
16 
17 #ifndef BOOST_CONFIG_HPP
18 #  include <boost/config.hpp>
19 #endif
20 
21 #if defined(BOOST_HAS_PRAGMA_ONCE)
22 #  pragma once
23 #endif
24 
25 #include <boost/intrusive/detail/config_begin.hpp>
26 #include <boost/move/detail/type_traits.hpp>
27 #include <cstddef>
28 
29 namespace boost {
30 namespace intrusive {
31 namespace detail {
32 
33 using boost::move_detail::is_same;
34 using boost::move_detail::add_const;
35 using boost::move_detail::remove_const;
36 using boost::move_detail::remove_cv;
37 using boost::move_detail::remove_reference;
38 using boost::move_detail::add_reference;
39 using boost::move_detail::remove_pointer;
40 using boost::move_detail::add_pointer;
41 using boost::move_detail::true_type;
42 using boost::move_detail::false_type;
43 using boost::move_detail::enable_if_c;
44 using boost::move_detail::enable_if;
45 using boost::move_detail::disable_if_c;
46 using boost::move_detail::disable_if;
47 using boost::move_detail::is_convertible;
48 using boost::move_detail::if_c;
49 using boost::move_detail::if_;
50 using boost::move_detail::is_const;
51 using boost::move_detail::identity;
52 using boost::move_detail::alignment_of;
53 using boost::move_detail::is_empty;
54 using boost::move_detail::addressof;
55 using boost::move_detail::integral_constant;
56 using boost::move_detail::enable_if_convertible;
57 using boost::move_detail::disable_if_convertible;
58 using boost::move_detail::bool_;
59 using boost::move_detail::true_;
60 using boost::move_detail::false_;
61 using boost::move_detail::yes_type;
62 using boost::move_detail::no_type;
63 using boost::move_detail::apply;
64 using boost::move_detail::eval_if_c;
65 using boost::move_detail::eval_if;
66 using boost::move_detail::unvoid_ref;
67 using boost::move_detail::add_const_if_c;
68 
69 template<std::size_t S>
70 struct ls_zeros
71 {
72    static const std::size_t value = (S & std::size_t(1)) ? 0 : (1 + ls_zeros<(S>>1u)>::value);
73 };
74 
75 template<>
76 struct ls_zeros<0>
77 {
78    static const std::size_t value = 0;
79 };
80 
81 template<>
82 struct ls_zeros<1>
83 {
84    static const std::size_t value = 0;
85 };
86 
87 // Infrastructure for providing a default type for T::TNAME if absent.
88 #define BOOST_INTRUSIVE_INSTANTIATE_DEFAULT_TYPE_TMPLT(TNAME)     \
89    template <typename T, typename DefaultType>                    \
90    struct boost_intrusive_default_type_ ## TNAME                  \
91    {                                                              \
92       template <typename X>                                       \
93       static char test(int, typename X::TNAME*);                  \
94                                                                   \
95       template <typename X>                                       \
96       static int test(...);                                       \
97                                                                   \
98       struct DefaultWrap { typedef DefaultType TNAME; };          \
99                                                                   \
100       static const bool value = (1 == sizeof(test<T>(0, 0)));     \
101                                                                   \
102       typedef typename                                            \
103          ::boost::intrusive::detail::if_c                         \
104             <value, T, DefaultWrap>::type::TNAME type;            \
105    };                                                             \
106    //
107 
108 #define BOOST_INTRUSIVE_OBTAIN_TYPE_WITH_DEFAULT(INSTANTIATION_NS_PREFIX, T, TNAME, TIMPL)   \
109       typename INSTANTIATION_NS_PREFIX                                                       \
110          boost_intrusive_default_type_ ## TNAME< T, TIMPL >::type                            \
111 //
112 
113 #define BOOST_INTRUSIVE_INSTANTIATE_EVAL_DEFAULT_TYPE_TMPLT(TNAME)\
114    template <typename T, typename DefaultType>                    \
115    struct boost_intrusive_eval_default_type_ ## TNAME             \
116    {                                                              \
117       template <typename X>                                       \
118       static char test(int, typename X::TNAME*);                  \
119                                                                   \
120       template <typename X>                                       \
121       static int test(...);                                       \
122                                                                   \
123       struct DefaultWrap                                          \
124       { typedef typename DefaultType::type TNAME; };              \
125                                                                   \
126       static const bool value = (1 == sizeof(test<T>(0, 0)));     \
127                                                                   \
128       typedef typename                                            \
129          ::boost::intrusive::detail::eval_if_c                    \
130             < value                                               \
131             , ::boost::intrusive::detail::identity<T>             \
132             , ::boost::intrusive::detail::identity<DefaultWrap>   \
133             >::type::TNAME type;                                  \
134    };                                                             \
135 //
136 
137 #define BOOST_INTRUSIVE_OBTAIN_TYPE_WITH_EVAL_DEFAULT(INSTANTIATION_NS_PREFIX, T, TNAME, TIMPL) \
138       typename INSTANTIATION_NS_PREFIX                                                          \
139          boost_intrusive_eval_default_type_ ## TNAME< T, TIMPL >::type                          \
140 //
141 
142 #define BOOST_INTRUSIVE_INTERNAL_STATIC_BOOL_IS_TRUE(TRAITS_PREFIX, TYPEDEF_TO_FIND) \
143 template <class T>\
144 struct TRAITS_PREFIX##_bool\
145 {\
146    template<bool Add>\
147    struct two_or_three {yes_type _[2 + Add];};\
148    template <class U> static yes_type test(...);\
149    template <class U> static two_or_three<U::TYPEDEF_TO_FIND> test (int);\
150    static const std::size_t value = sizeof(test<T>(0));\
151 };\
152 \
153 template <class T>\
154 struct TRAITS_PREFIX##_bool_is_true\
155 {\
156    static const bool value = TRAITS_PREFIX##_bool<T>::value > sizeof(yes_type)*2;\
157 };\
158 //
159 
160 #define BOOST_INTRUSIVE_HAS_STATIC_MEMBER_FUNC_SIGNATURE(TRAITS_NAME, FUNC_NAME) \
161   template <typename U, typename Signature> \
162   class TRAITS_NAME \
163   { \
164   private: \
165   template<Signature> struct helper;\
166   template<typename T> \
167   static ::boost::intrusive::detail::yes_type test(helper<&T::FUNC_NAME>*); \
168   template<typename T> static ::boost::intrusive::detail::no_type test(...); \
169   public: \
170   static const bool value = sizeof(test<U>(0)) == sizeof(::boost::intrusive::detail::yes_type); \
171   }; \
172 //
173 
174 #define BOOST_INTRUSIVE_HAS_MEMBER_FUNC_CALLED(TRAITS_NAME, FUNC_NAME) \
175 template <typename Type> \
176 struct TRAITS_NAME \
177 { \
178    struct BaseMixin \
179    { \
180       void FUNC_NAME(); \
181    }; \
182    struct Base : public Type, public BaseMixin { Base(); }; \
183    template <typename T, T t> class Helper{}; \
184    template <typename U> \
185    static ::boost::intrusive::detail::no_type  test(U*, Helper<void (BaseMixin::*)(), &U::FUNC_NAME>* = 0); \
186    static ::boost::intrusive::detail::yes_type test(...); \
187    static const bool value = sizeof(::boost::intrusive::detail::yes_type) == sizeof(test((Base*)(0))); \
188 };\
189 //
190 
191 #define BOOST_INTRUSIVE_HAS_MEMBER_FUNC_CALLED_IGNORE_SIGNATURE(TRAITS_NAME, FUNC_NAME) \
192 BOOST_INTRUSIVE_HAS_MEMBER_FUNC_CALLED(TRAITS_NAME##_ignore_signature, FUNC_NAME) \
193 \
194 template <typename Type, class> \
195 struct TRAITS_NAME \
196    : public TRAITS_NAME##_ignore_signature<Type> \
197 {};\
198 //
199 
200 } //namespace detail
201 } //namespace intrusive
202 } //namespace boost
203 
204 #include <boost/intrusive/detail/config_end.hpp>
205 
206 #endif //BOOST_INTRUSIVE_DETAIL_MPL_HPP
207