Re: [pygccxml-development] Parameter passing, ownership semantics

[Roman Y. <rom...@gm...>]

On 2/19/07, Gustavo Carneiro <gjc...@gm...> wrote:
>   Even with the name mangling problem, something was not right:
>
> gjc@nazgul:python$  python test-schedule.py
> Traceback (most recent call last):
>   File "test-schedule.py ", line 11, in <module>
>     Simulator.Schedule_fbf096d706be19b392c1e3fbcd3bf544(t1,
> ev)
> Boost.Python.ArgumentError: Python argument types in
>
> Simulator.Schedule_fbf096d706be19b392c1e3fbcd3bf544(Time,
> MyEvent)
> did not match C++ signature:
>     Schedule_fbf096d706be19b392c1e3fbcd3bf544(ns3::Time
> time, std::auto_ptr<ns3::EventImpl> event)
>
>   Then I saw something I missed in the unit test, and added this code:
>
>     EventImpl = mb.class_('EventImpl')
>     EventImpl.held_type = 'std::auto_ptr< %s >' % EventImpl.decl_string
>
>   (EventImpl is the type of the argument that is subject to the ownership
> transfer)
>
>   But with the above changes the code doesn't compile (errors below).  The
> generated source contains:
>
>     bp::class_< EventImpl_wrapper, std::auto_ptr< ::ns3::EventImpl >,
> boost::noncopyable >( "EventImpl" )
>         .def( bp::init< >() )
>
>   The error comes from the ".def( bp::init< >() )" line.  Manually
removing
> the "std::auto_ptr< ::ns3::EventImpl >" part from the first line solves
the
> compilation error.
>
>    Any hints?

Yes:
1. change "std::auto_ptr< ::ns3::EventImpl >" to
    "std::auto_ptr< EventImpl_wrapper >" and add next line to your code:

ei = mb.class_( 'EventImpl' )
ei.add_registration_code(
    "boost::python::implicitly_convertible< std::auto_ptr< EventImpl_wrapper
>, std::auto_ptr< ::ns3::EventImpl > >();"
   , False )

This should help.

2. If not, please create small standalone test case, which reproduce the
problem.
    I will take a look on it.


-- 
Roman Yakovenko
C++ Python language binding
http://www.language-binding.net/