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- // 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/def.hpp>
- #include <boost/python/return_value_policy.hpp>
- #include <boost/python/manage_new_object.hpp>
- #include <boost/python/return_internal_reference.hpp>
- #include <boost/python/class.hpp>
- using namespace boost::python;
- int a_instances = 0;
- int num_a_instances() { return a_instances; }
- struct inner
- {
- inner(std::string const& s)
- : s(s)
- {}
- void change(std::string const& new_s)
- {
- this->s = new_s;
- }
- std::string s;
- };
- struct Base
- {
- virtual ~Base() {}
- };
- struct A : Base
- {
- A(std::string const& s)
- : x(s)
- {
- ++a_instances;
- }
- ~A()
- {
- --a_instances;
- }
- std::string content() const
- {
- return x.s;
- }
- inner& get_inner()
- {
- return x;
- }
- inner x;
- };
- struct B
- {
- B() : x(0) {}
- B(A* x_) : x(x_) {}
- inner const* adopt(A* _x) { this->x = _x; return &_x->get_inner(); }
- std::string a_content()
- {
- return x ? x->content() : std::string("empty");
- }
- A* x;
- };
- A* create(std::string const& s)
- {
- return new A(s);
- }
- A* as_A(Base* b)
- {
- return dynamic_cast<A*>(b);
- }
- BOOST_PYTHON_MODULE(test_pointer_adoption_ext)
- {
- def("num_a_instances", num_a_instances);
- // Specify the manage_new_object return policy to take
- // ownership of create's result
- def("create", create, return_value_policy<manage_new_object>());
- def("as_A", as_A, return_internal_reference<>());
- class_<Base>("Base")
- ;
- class_<A, bases<Base> >("A", no_init)
- .def("content", &A::content)
- .def("get_inner", &A::get_inner, return_internal_reference<>())
- ;
- class_<inner>("inner", no_init)
- .def("change", &inner::change)
- ;
- class_<B>("B")
- .def(init<A*>()[with_custodian_and_ward_postcall<1,2>()])
- .def("adopt", &B::adopt
- // Adopt returns a pointer referring to a subobject of its 2nd argument (1st being "self")
- , return_internal_reference<2
- // Meanwhile, self holds a reference to the 2nd argument.
- , with_custodian_and_ward<1,2> >()
- )
- .def("a_content", &B::a_content)
- ;
- }
- #include "module_tail.cpp"
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