on Sun Feb 01 2009, Eric Jonas <jonas-AT-MIT.EDU> wrote:
> I am trying to return a shared pointer to a class Foo and then
> test the results in python for equality, but they always seem to fail.
> I've created the following two trivial classes:
>
> class Foo : public boost::noncopyable
> {
> };
>
> typedef boost::shared_ptr<Foo> pFoo_t;
>
> class FooCreator
> {
> public:
> pFoo_t createFoo() {
> pFoo_t ft(new Foo);
> intfoo = ft;
> return ft;
> }
The key is that you have to associate the python object with the
shared_ptr that you're going to return. The original one that wraps the
Foo object you created didn't have any relationship to a Python object.
Try this:
pFoo_t createFoo() {
object o(pFoo_t(new Foo));
intFoo = extract<pFoo_t>(o);
return intFoo;
}
>
> pFoo_t getFoo() {
> return intfoo;
> }
>
> pFoo_t intfoo;
>
> };
>
>
> That I expose with boost::python via:
>
> class_<Foo, pFoo_t, boost::noncopyable>("Foo", no_init);
>
> class_<FooCreator>("FooCreator")
> .def("createFoo", &FooCreator::createFoo)
> .def("getFoo", &FooCreator::getFoo);
>
> Yet the following assert fails:
>
> fc = FooCreator()
>
> foo = fc.createFoo()
> foo2 = fc.getFoo()
>
> assert_equal(foo, foo2)
>
> The above assert fails. I've tried using the newest boost::python, I've
> looked through the mailing list archives and even asked on IRC, but I
> still can't figure out which part of this process I'm doing incorrectly.
> I've spent about 20 hours reducing my problem to this test case, and am
> really stumped.
--
Dave Abrahams
BoostPro Computing
http://www.boostpro.com
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