[C++-sig] set python attribute from C++

[Gennadiy Rozental]

David Abrahams <dave <at> boostpro.com> writes:

> on Thu Jul 17 2008, Gennadiy Rozental <rogeeff-AT-gmail.com> wrote:
> 
> > David Abrahams <dave <at> boostpro.com> writes:
> >> >> Base*
> >> >> PythonFactory::create(...) 
> >> >> {
> >> >>    bp::object obj = m_py_type();
> >> >>    PythonBase* ptr = bp::extract<PythonBase*>( obj );
> >> >> 
> >> >>    ptr->init( obj );
> >> >
> >> >      // make sure python object is not destroyed once we leave 
> >> >      // this scope
> >> >      bp::incref( obj );
> >> 
> >> Oh, well in that case, it adds nothing.  You may as well leave 
> >> the incref/decref out.
> >
> > No. I can't (or at least it does not work for me). Without it 
> > python object is destroyed immediately once we leave create 
> > function scope and ptr become dangling pointer.
> 
> Then m_object is a raw pointer and not a bp::object as you've
> described in your code examples.

Hmm. You right. I do not need it anymore. 

I used to need it because init method above was invoked later - after we left
create function. Not anymore. I removed both incref/decref and everything works
fine.

Thanks

Gennadiy