[pygccxml-development] Parameter passing, ownership semantics

[Gustavo C. <gjc...@gm...>]

  Take this program, where Simulator and EventImpl are C++ classes wrapped
by Py++ / boost python:

class MyEvent(EventImpl):

    def Notify(self, *args):
        print "Notify!", args


ev = MyEvent()
t1 = Seconds(1)
Simulator.Schedule(t1, ev)
Simulator.Run()

  There's a memory error here because 'ev' is passed into Simulator, which
takes ownership of the value and eventually calls delete on C++ counterpart
to 'ev'.  valgrind says that Address 0xsomething is 8 bytes inside the
object allocated by boost python.

  If, OTOH, I do "Simulator.Schedule(Seconds(1), MyEvent())", then the
python objects are prematurely destroyed, and another memory error occurs.

  I notice that Py++ "call policies" are always related to the return value;
I don't see how to customize the parameter passing aspect of it all.

  Any advice is appreciated.  Thanks in advance.

-- 
Gustavo J. A. M. Carneiro
"The universe is always one step beyond logic."