Dave, Here is the reduced example with only the `boost::enable_shared_from_this` variant. The issues are all as reported before.
-Holger
On Mon, Apr 23, 2012 at 22:25, Dave Abrahams <d...@boostpro.com> wrote:
>
> on Mon Apr 23 2012, Holger Brandsmeier <brandsmeier-AT-gmx.de> wrote:
>
>> In fact the statement
>> class_<IWrapper, boost::shared_ptr<IWrapper>, boost::noncopyable
>>>("I", init<>() )
>> has an issue. When I call getThisRCP() later, and the return value is
>> not a null shared pointer, then I in fact the error
>> TypeError: No to_python (by-value) converter found for C++ type:
>> boost::shared_ptr<I>
>> which is quite annoying. I also implemented Dave's suggestion with
>> boost::enable_shared_from_this and because of the above issue I used
>> this for the Wrapper and not the class itself (see K and KWrapper in
>> the attachment).
>>
>> The behaviour of `enable_shared_from_this` is different from my
>> initual getThisRCP() / setThisRCP() solution but still has seriour
>> problems. Concider the code:
>>
>> class KDer(K):
>> def __init__(self):
>> K.__init__(self)
>>
>> k = KDer()
>>
>> In contrast to my initial solution the lines
>> assert k.getThisRCP2() is not None
>> k2 = k.getThisRCP2()
>> now work, which is nice.
>>
>> Also this call works now:
>> print k2.foo();
>>
>> However, the following two lines
>> del k
>> print k2.foo();
>> give a segmentation fault. Note that the destructor for the class `K`
>> has not been called, which would have printed a statement.
>
> Please post a reduced example without any of the "J" business that
> illustrates exactly the problem you're having for this one particular
> case. If doing so doesn't immediately reveal the problem to you, I'm
> sure we can get to the bottom of it here.
>
>
> --
> Dave Abrahams
> BoostPro Computing
> http://www.boostpro.com
>
> _______________________________________________
> Cplusplus-sig mailing list
> Cplusplus-sig@python.org
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test_rcp.py
Description: Binary data
#include <boost/python.hpp>
#include "iostream"
#include "string"
#include "boost/weak_ptr.hpp"
#include "boost/enable_shared_from_this.hpp"
using namespace boost::python;
using namespace std;
//using Teuchos::RCP;
struct K
// : public boost::enable_shared_from_this<K>
{
virtual int foo() = 0;
virtual ~K() {
std::cout << "destructor for K called ..." << std::endl;
}
/*boost::shared_ptr<K> getThisRCP() {
return shared_from_this();
}*/
};
struct KWrapper : public K, public boost::python::wrapper<K>,
public boost::enable_shared_from_this<KWrapper>
{
KWrapper() {
}
virtual int foo() {
if( override f = this->get_override("foo") ) {
return f();
} else {
return base_foo();
}
}
boost::shared_ptr<KWrapper> getThisRCP2() {
return shared_from_this();
}
int base_foo() {
return 0;
}
};
BOOST_PYTHON_MODULE(thisRCPPy)
{
{
typedef K ClassT;
class_<KWrapper, boost::shared_ptr<KWrapper>, boost::noncopyable >("K", init<>() )
//.def("getThisRCP", &ClassT::getThisRCP)
.def("getThisRCP2", &KWrapper::getThisRCP2)
.def("foo", &ClassT::foo)
;
}
}
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