Python Swig包装器：如何访问底层PyObject

Question

I've got class A wrapped with method foo implemented using %extend:

class A { ... %extend { void foo() { self->foo_impl(); } }

Now I want to increase ref count to an A inside foo_impl, but I only got A* (as self).

Question: how can I write/wrap function foo, so that I have an access both to A* and underlying PyObject*?

Thank you

Answer 1

I think it's not possible. If you need to increase the refcount, it's because you don't want the C++ object to be destroyed when it goes out of scope because there is a pointer to that object elsewhere. In that case, look at using the DISOWN typemap to ensure the target language doesn't think it "owns" the C++ object, so it won't get destroyed.