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Today's Topics:

1. Segmentation Fault with Boost.Python and Inheritance

(Gabe Rives-Corbett)

2. Re: Segmentation Fault with Boost.Python and Inheritance

(Jonas Wielicki)

----------------------------------------------------------------------

Message: 1

Date: Thu, 17 May 2012 17:42:52 -0400

From: Gabe Rives-Corbett <gabe@gaberivescorbett.com>

To: cplusplus-sig@python.org

Subject: [C++-sig] Segmentation Fault with Boost.Python and

Inheritance

Message-ID: <61DAADFBCA6D4C468EF8216B42EBAE48@gaberivescorbett.com>

Content-Type: text/plain; charset="utf-8"

Hello,

I'm getting a seg fault when trying to call a virtual method on a base class from python. Code is below:

#include <memory>

namespace boost {

template<class T> const T* get_pointer(const std::shared_ptr<T>& ptr)

{

return ptr.get();

}

template<class T> T* get_pointer(std::shared_ptr<T>& ptr)

{

return ptr.get();

}

#include <Python.h>

#include <boost/python.hpp>

namespace bp = boost::python;

class MyBase

{

public:

MyBase(){}

virtual ~MyBase(){}

virtual void baseTest() { printf("base test\n"); }

};

class MyDerived : public MyBase

{

public:

MyDerived() {}

virtual ~MyDerived(){}

void derivedTest() { printf("derived test\n"); }

};

BOOST_PYTHON_MODULE(PythonTest)

{

bp::class_<MyBase, std::shared_ptr<MyBase>>("MyBase")

.def("baseTest", &MyBase::baseTest);

bp::class_<MyDerived, bp::bases<MyBase>, std::shared_ptr<MyDerived>>("MyDerived")

.def("derivedTest", &MyDerived::derivedTest);

bp::implicitly_convertible<std::shared_ptr<MyDerived>, std::shared_ptr<MyBase>>();

}

Does it have to do with using std::shared_ptr for storage? If so is there a way around this? Any help is appreciated.

Gabe Rives-Corbett

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------------------------------

Message: 2

Date: Fri, 18 May 2012 10:41:03 +0200

From: Jonas Wielicki <j.wielicki@sotecware.net>

To: cplusplus-sig@python.org

Subject: Re: [C++-sig] Segmentation Fault with Boost.Python and

Inheritance

Message-ID: <4FB60B1F.2050708@sotecware.net>

Content-Type: text/plain; charset=ISO-8859-1

On 17/05/12 23:42, Gabe Rives-Corbett wrote:

I'm getting a seg fault when trying to call a virtual method on a base class from python.

I had a similar problem a few days ago. Which g++ version are you using?

I had problems with 4.7.0 (redhat) while 4.6.3 (redhat) was working fine.

Jonas

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