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1 | #if !defined(BOOST_PP_IS_ITERATING) |
2 | ||
3 | // Copyright David Abrahams 2001. | |
4 | // Distributed under the Boost Software License, Version 1.0. (See | |
5 | // accompanying file LICENSE_1_0.txt or copy at | |
6 | // http://www.boost.org/LICENSE_1_0.txt) | |
7 | ||
8 | # ifndef POINTER_HOLDER_DWA20011215_HPP | |
9 | # define POINTER_HOLDER_DWA20011215_HPP | |
10 | ||
11 | # include <boost/get_pointer.hpp> | |
12 | # include <boost/type.hpp> | |
13 | ||
14 | # include <boost/python/instance_holder.hpp> | |
15 | # include <boost/python/object/inheritance_query.hpp> | |
16 | # include <boost/python/object/forward.hpp> | |
17 | ||
18 | # include <boost/python/pointee.hpp> | |
19 | # include <boost/python/type_id.hpp> | |
20 | ||
21 | # include <boost/python/detail/wrapper_base.hpp> | |
22 | # include <boost/python/detail/force_instantiate.hpp> | |
23 | # include <boost/python/detail/preprocessor.hpp> | |
24 | ||
25 | ||
26 | # include <boost/mpl/if.hpp> | |
27 | # include <boost/mpl/apply.hpp> | |
28 | ||
29 | # include <boost/preprocessor/comma_if.hpp> | |
30 | # include <boost/preprocessor/iterate.hpp> | |
31 | # include <boost/preprocessor/repeat.hpp> | |
32 | # include <boost/preprocessor/debug/line.hpp> | |
33 | # include <boost/preprocessor/enum_params.hpp> | |
34 | # include <boost/preprocessor/repetition/enum_binary_params.hpp> | |
35 | ||
36 | # include <boost/detail/workaround.hpp> | |
37 | ||
38 | # include <boost/type_traits/remove_const.hpp> | |
39 | ||
40 | namespace boost { namespace python { | |
41 | ||
42 | template <class T> class wrapper; | |
43 | ||
44 | }} | |
45 | ||
46 | ||
47 | namespace boost { namespace python { namespace objects { | |
48 | ||
49 | #define BOOST_PYTHON_UNFORWARD_LOCAL(z, n, _) BOOST_PP_COMMA_IF(n) objects::do_unforward(a##n,0) | |
50 | ||
51 | template <class Pointer, class Value> | |
52 | struct pointer_holder : instance_holder | |
53 | { | |
54 | typedef Value value_type; | |
55 | ||
56 | pointer_holder(Pointer); | |
57 | ||
58 | // Forward construction to the held object | |
59 | ||
60 | # define BOOST_PP_ITERATION_PARAMS_1 (4, (0, BOOST_PYTHON_MAX_ARITY, <boost/python/object/pointer_holder.hpp>, 1)) | |
61 | # include BOOST_PP_ITERATE() | |
62 | ||
63 | private: // types | |
64 | ||
65 | private: // required holder implementation | |
66 | void* holds(type_info, bool null_ptr_only); | |
67 | ||
68 | template <class T> | |
69 | inline void* holds_wrapped(type_info dst_t, wrapper<T>*,T* p) | |
70 | { | |
71 | return python::type_id<T>() == dst_t ? p : 0; | |
72 | } | |
73 | ||
74 | inline void* holds_wrapped(type_info, ...) | |
75 | { | |
76 | return 0; | |
77 | } | |
78 | ||
79 | private: // data members | |
80 | Pointer m_p; | |
81 | }; | |
82 | ||
83 | template <class Pointer, class Value> | |
84 | struct pointer_holder_back_reference : instance_holder | |
85 | { | |
86 | private: | |
87 | typedef typename python::pointee<Pointer>::type held_type; | |
88 | public: | |
89 | typedef Value value_type; | |
90 | ||
91 | // Not sure about this one -- can it work? The source object | |
92 | // undoubtedly does not carry the correct back reference pointer. | |
93 | pointer_holder_back_reference(Pointer); | |
94 | ||
95 | // Forward construction to the held object | |
96 | # define BOOST_PP_ITERATION_PARAMS_1 (4, (0, BOOST_PYTHON_MAX_ARITY, <boost/python/object/pointer_holder.hpp>, 2)) | |
97 | # include BOOST_PP_ITERATE() | |
98 | ||
99 | private: // required holder implementation | |
100 | void* holds(type_info, bool null_ptr_only); | |
101 | ||
102 | private: // data members | |
103 | Pointer m_p; | |
104 | }; | |
105 | ||
106 | # undef BOOST_PYTHON_UNFORWARD_LOCAL | |
107 | ||
108 | template <class Pointer, class Value> | |
109 | inline pointer_holder<Pointer,Value>::pointer_holder(Pointer p) | |
110 | #if __cplusplus < 201103L | |
111 | : m_p(p) | |
112 | #else | |
113 | : m_p(std::move(p)) | |
114 | #endif | |
115 | { | |
116 | } | |
117 | ||
118 | template <class Pointer, class Value> | |
119 | inline pointer_holder_back_reference<Pointer,Value>::pointer_holder_back_reference(Pointer p) | |
120 | #if __cplusplus < 201103L | |
121 | : m_p(p) | |
122 | #else | |
123 | : m_p(std::move(p)) | |
124 | #endif | |
125 | { | |
126 | } | |
127 | ||
128 | template <class Pointer, class Value> | |
129 | void* pointer_holder<Pointer, Value>::holds(type_info dst_t, bool null_ptr_only) | |
130 | { | |
131 | typedef typename boost::remove_const< Value >::type non_const_value; | |
132 | ||
133 | if (dst_t == python::type_id<Pointer>() | |
134 | && !(null_ptr_only && get_pointer(this->m_p)) | |
135 | ) | |
136 | return &this->m_p; | |
137 | ||
138 | Value* p0 | |
139 | # if BOOST_WORKAROUND(__SUNPRO_CC, BOOST_TESTED_AT(0x590)) | |
140 | = static_cast<Value*>( get_pointer(this->m_p) ) | |
141 | # else | |
142 | = get_pointer(this->m_p) | |
143 | # endif | |
144 | ; | |
145 | non_const_value* p = const_cast<non_const_value*>( p0 ); | |
146 | ||
147 | if (p == 0) | |
148 | return 0; | |
149 | ||
150 | if (void* wrapped = holds_wrapped(dst_t, p, p)) | |
151 | return wrapped; | |
152 | ||
153 | type_info src_t = python::type_id<non_const_value>(); | |
154 | return src_t == dst_t ? p : find_dynamic_type(p, src_t, dst_t); | |
155 | } | |
156 | ||
157 | template <class Pointer, class Value> | |
158 | void* pointer_holder_back_reference<Pointer, Value>::holds(type_info dst_t, bool null_ptr_only) | |
159 | { | |
160 | if (dst_t == python::type_id<Pointer>() | |
161 | && !(null_ptr_only && get_pointer(this->m_p)) | |
162 | ) | |
163 | return &this->m_p; | |
164 | ||
165 | if (!get_pointer(this->m_p)) | |
166 | return 0; | |
167 | ||
168 | Value* p = get_pointer(m_p); | |
169 | ||
170 | if (dst_t == python::type_id<held_type>()) | |
171 | return p; | |
172 | ||
173 | type_info src_t = python::type_id<Value>(); | |
174 | return src_t == dst_t ? p : find_dynamic_type(p, src_t, dst_t); | |
175 | } | |
176 | ||
177 | }}} // namespace boost::python::objects | |
178 | ||
179 | # endif // POINTER_HOLDER_DWA20011215_HPP | |
180 | ||
181 | /* --------------- pointer_holder --------------- */ | |
182 | // For gcc 4.4 compatability, we must include the | |
183 | // BOOST_PP_ITERATION_DEPTH test inside an #else clause. | |
184 | #else // BOOST_PP_IS_ITERATING | |
185 | #if BOOST_PP_ITERATION_DEPTH() == 1 && BOOST_PP_ITERATION_FLAGS() == 1 | |
186 | # if !(BOOST_WORKAROUND(__MWERKS__, > 0x3100) \ | |
187 | && BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3201))) | |
188 | # line BOOST_PP_LINE(__LINE__, pointer_holder.hpp) | |
189 | # endif | |
190 | ||
191 | # define N BOOST_PP_ITERATION() | |
192 | ||
193 | # if (N != 0) | |
194 | template< BOOST_PP_ENUM_PARAMS_Z(1, N, class A) > | |
195 | # endif | |
196 | pointer_holder(PyObject* self BOOST_PP_COMMA_IF(N) BOOST_PP_ENUM_BINARY_PARAMS_Z(1, N, A, a)) | |
197 | : m_p(new Value( | |
198 | BOOST_PP_REPEAT_1ST(N, BOOST_PYTHON_UNFORWARD_LOCAL, nil) | |
199 | )) | |
200 | { | |
201 | python::detail::initialize_wrapper(self, get_pointer(this->m_p)); | |
202 | } | |
203 | ||
204 | # undef N | |
205 | ||
206 | /* --------------- pointer_holder_back_reference --------------- */ | |
207 | #elif BOOST_PP_ITERATION_DEPTH() == 1 && BOOST_PP_ITERATION_FLAGS() == 2 | |
208 | # if !(BOOST_WORKAROUND(__MWERKS__, > 0x3100) \ | |
209 | && BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3201))) | |
210 | # line BOOST_PP_LINE(__LINE__, pointer_holder.hpp(pointer_holder_back_reference)) | |
211 | # endif | |
212 | ||
213 | # define N BOOST_PP_ITERATION() | |
214 | ||
215 | # if (N != 0) | |
216 | template < BOOST_PP_ENUM_PARAMS_Z(1, N, class A) > | |
217 | # endif | |
218 | pointer_holder_back_reference( | |
219 | PyObject* p BOOST_PP_COMMA_IF(N) BOOST_PP_ENUM_BINARY_PARAMS_Z(1, N, A, a)) | |
220 | : m_p(new held_type( | |
221 | p BOOST_PP_COMMA_IF(N) BOOST_PP_REPEAT_1ST(N, BOOST_PYTHON_UNFORWARD_LOCAL, nil) | |
222 | )) | |
223 | {} | |
224 | ||
225 | # undef N | |
226 | ||
227 | #endif // BOOST_PP_ITERATION_DEPTH() | |
228 | #endif |