From comp.python.c++ newsgroup:
1. The constructors of some classes I am trying to wrap are private because instances must be created by using a factory. Is it possible to wrap such classes using bpl v2?
Sure. Of course you can only create the instances using the factory...
If you look at libs/python/test/test_pointer_adoption.cpp you'll see the factory function "create" is being used to generate new instances of class A. It uses return_value_policy<manage_new_object> to instruct Python to adopt the A* to hold the instance.
A* create(std::string const& s) { return new A(s); } BOOST_PYTHON_MODULE_INIT(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>()); class_<A>() .def("content", &A::content) .def("get_inner", &A::get_inner, return_internal_reference<>()) ; }
2.