1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
// Copyright David Abrahams 2002.
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include <boost/python/module.hpp>
#include <boost/python/class.hpp>
#include <boost/python/return_value_policy.hpp>
#include <boost/python/manage_new_object.hpp>
#include <boost/python/reference_existing_object.hpp>
#include <boost/python/pure_virtual.hpp>
#include <boost/python/wrapper.hpp>
#include <boost/python/def.hpp>
#include <boost/python/call.hpp>
#include <boost/utility.hpp>
#include <memory>
#ifdef HELD_BY_AUTO_PTR
# define HELD_PTR(X) , std::auto_ptr< X >
#else
# define HELD_PTR(X)
#endif
using namespace boost::python;
struct P
{
virtual ~P(){}
virtual char const* f() = 0;
char const* g() { return "P::g()"; }
};
struct PCallback : P, wrapper<P>
{
char const* f()
{
#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
return call<char const*>(this->get_override("f").ptr());
#else
return this->get_override("f")();
#endif
}
};
struct Q : virtual P
{
char const* f() { return "Q::f()"; }
};
struct A
{
virtual ~A(){}
virtual char const* f() { return "A::f()"; }
};
struct ACallback : A, wrapper<A>
{
char const* f()
{
if (override f = this->get_override("f"))
#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
return call<char const*>(f.ptr());
#else
return f();
#endif
return A::f();
}
char const* default_f() { return this->A::f(); }
};
struct B : A
{
virtual char const* f() { return "B::f()"; }
};
struct C : A
{
virtual char const* f() { return "C::f()"; }
};
struct D : A
{
virtual char const* f() { return "D::f()"; }
char const* g() { return "D::g()"; }
};
struct DCallback : D, wrapper<D>
{
char const* f()
{
if (override f = this->get_override("f"))
#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
return call<char const*>(f.ptr());
#else
return f();
#endif
//else
return D::f();
}
};
A& getBCppObj ()
{
static B b;
return b;
}
char const* call_f(A& a) { return a.f(); }
A* factory(unsigned choice)
{
switch (choice % 3)
{
case 0: return new A;
break;
case 1: return new B;
break;
default: return new C;
break;
}
}
C& getCCppObj ()
{
static C c;
return c;
}
A* pass_a(A* x) { return x; }
#ifdef HELD_BY_AUTO_PTR
BOOST_PYTHON_MODULE_INIT(polymorphism2_auto_ptr_ext)
#else
BOOST_PYTHON_MODULE_INIT(polymorphism2_ext)
#endif
{
class_<ACallback HELD_PTR(A),boost::noncopyable>("A")
.def("f", &A::f, &ACallback::default_f)
;
def("getBCppObj", getBCppObj, return_value_policy<reference_existing_object>());
class_<C HELD_PTR(C),bases<A>,boost::noncopyable>("C")
.def("f", &C::f)
;
class_<DCallback HELD_PTR(D),bases<A>,boost::noncopyable>("D")
.def("f", &D::f)
.def("g", &D::g)
;
def("pass_a", &pass_a, return_internal_reference<>());
def("getCCppObj", getCCppObj, return_value_policy<reference_existing_object>());
def("factory", factory, return_value_policy<manage_new_object>());
def("call_f", call_f);
class_<PCallback,boost::noncopyable>("P")
.def("f", pure_virtual(&P::f))
;
class_<Q HELD_PTR(Q), bases<P> >("Q")
.def("g", &P::g) // make sure virtual inheritance doesn't interfere
;
}
//#include "module_tail.cpp"
|
