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 # include <boost/python/detail/type_traits.hpp>
25
26
27 # include <boost/mpl/if.hpp>
28 # include <boost/mpl/apply.hpp>
29
30 # include <boost/preprocessor/comma_if.hpp>
31 # include <boost/preprocessor/iterate.hpp>
32 # include <boost/preprocessor/repeat.hpp>
33 # include <boost/preprocessor/debug/line.hpp>
34 # include <boost/preprocessor/enum_params.hpp>
35 # include <boost/preprocessor/repetition/enum_binary_params.hpp>
36
37 # include <boost/detail/workaround.hpp>
38
39 namespace boost { namespace python {
40
41 template <class T> class wrapper;
42
43 }}
44
45
46 namespace boost { namespace python { namespace objects {
47
48 #define BOOST_PYTHON_UNFORWARD_LOCAL(z, n, _) BOOST_PP_COMMA_IF(n) objects::do_unforward(a##n,0)
49
50 template <class Pointer, class Value>
51 struct pointer_holder : instance_holder
52 {
53 typedef Value value_type;
54
55 pointer_holder(Pointer);
56
57 // Forward construction to the held object
58
59 # define BOOST_PP_ITERATION_PARAMS_1 (4, (0, BOOST_PYTHON_MAX_ARITY, <boost/python/object/pointer_holder.hpp>, 1))
60 # include BOOST_PP_ITERATE()
61
62 private: // types
63
64 private: // required holder implementation
65 void* holds(type_info, bool null_ptr_only);
66
67 template <class T>
holds_wrappedboost::python::objects::pointer_holder68 inline void* holds_wrapped(type_info dst_t, wrapper<T>*,T* p)
69 {
70 return python::type_id<T>() == dst_t ? p : 0;
71 }
72
holds_wrappedboost::python::objects::pointer_holder73 inline void* holds_wrapped(type_info, ...)
74 {
75 return 0;
76 }
77
78 private: // data members
79 Pointer m_p;
80 };
81
82 template <class Pointer, class Value>
83 struct pointer_holder_back_reference : instance_holder
84 {
85 private:
86 typedef typename python::pointee<Pointer>::type held_type;
87 public:
88 typedef Value value_type;
89
90 // Not sure about this one -- can it work? The source object
91 // undoubtedly does not carry the correct back reference pointer.
92 pointer_holder_back_reference(Pointer);
93
94 // Forward construction to the held object
95 # define BOOST_PP_ITERATION_PARAMS_1 (4, (0, BOOST_PYTHON_MAX_ARITY, <boost/python/object/pointer_holder.hpp>, 2))
96 # include BOOST_PP_ITERATE()
97
98 private: // required holder implementation
99 void* holds(type_info, bool null_ptr_only);
100
101 private: // data members
102 Pointer m_p;
103 };
104
105 # undef BOOST_PYTHON_UNFORWARD_LOCAL
106
107 template <class Pointer, class Value>
pointer_holder(Pointer p)108 inline pointer_holder<Pointer,Value>::pointer_holder(Pointer p)
109 #if defined(BOOST_NO_CXX11_SMART_PTR)
110 : m_p(p)
111 #else
112 : m_p(std::move(p))
113 #endif
114 {
115 }
116
117 template <class Pointer, class Value>
pointer_holder_back_reference(Pointer p)118 inline pointer_holder_back_reference<Pointer,Value>::pointer_holder_back_reference(Pointer p)
119 #if defined(BOOST_NO_CXX11_SMART_PTR)
120 : m_p(p)
121 #else
122 : m_p(std::move(p))
123 #endif
124 {
125 }
126
127 template <class Pointer, class Value>
holds(type_info dst_t,bool null_ptr_only)128 void* pointer_holder<Pointer, Value>::holds(type_info dst_t, bool null_ptr_only)
129 {
130 typedef typename boost::python::detail::remove_const< Value >::type non_const_value;
131
132 if (dst_t == python::type_id<Pointer>()
133 && !(null_ptr_only && get_pointer(this->m_p))
134 )
135 return &this->m_p;
136
137 Value* p0
138 # if BOOST_WORKAROUND(__SUNPRO_CC, BOOST_TESTED_AT(0x590))
139 = static_cast<Value*>( get_pointer(this->m_p) )
140 # else
141 = get_pointer(this->m_p)
142 # endif
143 ;
144 non_const_value* p = const_cast<non_const_value*>( p0 );
145
146 if (p == 0)
147 return 0;
148
149 if (void* wrapped = holds_wrapped(dst_t, p, p))
150 return wrapped;
151
152 type_info src_t = python::type_id<non_const_value>();
153 return src_t == dst_t ? p : find_dynamic_type(p, src_t, dst_t);
154 }
155
156 template <class Pointer, class Value>
holds(type_info dst_t,bool null_ptr_only)157 void* pointer_holder_back_reference<Pointer, Value>::holds(type_info dst_t, bool null_ptr_only)
158 {
159 if (dst_t == python::type_id<Pointer>()
160 && !(null_ptr_only && get_pointer(this->m_p))
161 )
162 return &this->m_p;
163
164 if (!get_pointer(this->m_p))
165 return 0;
166
167 Value* p = get_pointer(m_p);
168
169 if (dst_t == python::type_id<held_type>())
170 return p;
171
172 type_info src_t = python::type_id<Value>();
173 return src_t == dst_t ? p : find_dynamic_type(p, src_t, dst_t);
174 }
175
176 }}} // namespace boost::python::objects
177
178 # endif // POINTER_HOLDER_DWA20011215_HPP
179
180 /* --------------- pointer_holder --------------- */
181 // For gcc 4.4 compatability, we must include the
182 // BOOST_PP_ITERATION_DEPTH test inside an #else clause.
183 #else // BOOST_PP_IS_ITERATING
184 #if BOOST_PP_ITERATION_DEPTH() == 1 && BOOST_PP_ITERATION_FLAGS() == 1
185 # if !(BOOST_WORKAROUND(__MWERKS__, > 0x3100) \
186 && BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3201)))
187 # line BOOST_PP_LINE(__LINE__, pointer_holder.hpp)
188 # endif
189
190 # define N BOOST_PP_ITERATION()
191
192 # if (N != 0)
193 template< BOOST_PP_ENUM_PARAMS_Z(1, N, class A) >
194 # endif
195 pointer_holder(PyObject* self BOOST_PP_COMMA_IF(N) BOOST_PP_ENUM_BINARY_PARAMS_Z(1, N, A, a))
196 : m_p(new Value(
197 BOOST_PP_REPEAT_1ST(N, BOOST_PYTHON_UNFORWARD_LOCAL, nil)
198 ))
199 {
200 python::detail::initialize_wrapper(self, get_pointer(this->m_p));
201 }
202
203 # undef N
204
205 /* --------------- pointer_holder_back_reference --------------- */
206 #elif BOOST_PP_ITERATION_DEPTH() == 1 && BOOST_PP_ITERATION_FLAGS() == 2
207 # if !(BOOST_WORKAROUND(__MWERKS__, > 0x3100) \
208 && BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3201)))
209 # line BOOST_PP_LINE(__LINE__, pointer_holder.hpp(pointer_holder_back_reference))
210 # endif
211
212 # define N BOOST_PP_ITERATION()
213
214 # if (N != 0)
215 template < BOOST_PP_ENUM_PARAMS_Z(1, N, class A) >
216 # endif
217 pointer_holder_back_reference(
218 PyObject* p BOOST_PP_COMMA_IF(N) BOOST_PP_ENUM_BINARY_PARAMS_Z(1, N, A, a))
219 : m_p(new held_type(
220 p BOOST_PP_COMMA_IF(N) BOOST_PP_REPEAT_1ST(N, BOOST_PYTHON_UNFORWARD_LOCAL, nil)
221 ))
222 {}
223
224 # undef N
225
226 #endif // BOOST_PP_ITERATION_DEPTH()
227 #endif
228