I want to do it another way around: Instance of Owner should hold reference to data_1 and data_2 as long as owner is alive.
Now following happens: owner = Owner() data_1 = Data(owner) # data_1 ownership is transferred to owner object data_2 = Data(owner) # data_2 ownership is transferred to owner object print owner.get_data_objects() <data_1>, <data_2> del data_1 del data_2 print owner.get_data_objects() # Crash because data_1 and data_2 are deleted even owner should still hold the reference. I tried to do it like http://www.boost.org/doc/libs/1_49_0/libs/python/test/injected.cpp but it didn't worked for me. On Thu, Jul 5, 2012 at 7:00 PM, John Reid <j.r...@mail.cryst.bbk.ac.uk>wrote: > On 05/07/12 11:49, Jani Tiainen wrote: > > Hi, > > > > I'm new to python.boost library and I'm trying to use it to wrap a third > > party library. Everything else I've managed to get working - thanks to > > excellent library and lot of examples I've found around a net. > > > > Only thing I can't get working properly is instance ownership transfer > > in constructor. > > > > So classes in library are defined like follows: > > > > class Owner { > > ... > > } > > > > class Data { > > Data(Owner *owner); // <-- Here happens ownership transfer. > > } > > > > > > Python code is like follows: > > > > owner = Owner() > > data_1 = Data(owner) > > data_2 = Data(owner) > > > > So when Python script stops runnning it causes crash due the fact that > > I've data objects are automatically destroyed by Owner-class but Python > > deletes them by using Data-class destructor (which shouldn't happen > ever). > > > > If I understand you correctly then you want the owner object to remain > alive at least as long as data_1 and data_2? If so you could use > with_custodian_and_ward: > > http://www.boost.org/doc/libs/1_49_0/libs/python/doc/v2/with_custodian_and_ward.html > > For example something like the following should work: > > namespace py = boost::python; > py::class_< > ... > > my_class( > "Data", > "docstring.", > py::init< Owner * >( "Constructor." )[ > py::with_custodian_and_ward< 1, 2 >() > ] > ); > > _______________________________________________ > Cplusplus-sig mailing list > Cplusplus-sig@python.org > http://mail.python.org/mailman/listinfo/cplusplus-sig > -- Jani Tiainen - Well planned is half done, and a half done has been sufficient before...
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