[C++-sig] Assert fail during deletion for an obj containing external object ptr

[Gangadhar NPK]

Hi Romanov,
I am trying to learn Boost.python, so I might be wrong in the way I
have written code. How, do you think should the same thing be codified
?

Thank You
Gangadhar
On 9/18/06, Roman Yakovenko <roman.yakovenko at gmail.com> wrote:
> On 9/18/06, Roman Yakovenko <roman.yakovenko at gmail.com> wrote:
> > On 9/18/06, Gangadhar NPK <npk.gangadhar at gmail.com> wrote:
> > > All,
> > > I am a beginner for Boost.Python, so please be kind on the responses.
> > > I am trying to create python wrappers for an existing library. I can't
> > > change the source of the library ( I don't even have the src to
> > > change). Also, since most of the classes are via factories, I can't
> > > try to derive from the base classes, so am providing the wrappers by
> > > containership. The python wrappers will contain the pointers to the
> > > 3rd party libs.
> > >
> > > When I do this, I am able to get the interface to the third party
> > > library's base interface, but during destruction (during the
> > > interpretor exit), I get this assert failure:
> > > ---------------------------
> > > Microsoft Visual C++ Debug Library
> > > ---------------------------
> > > Debug Assertion Failed!
> > > Program: c:\Python24\python.exe
> > > File: dbgdel.cpp
> > > Line: 51
> > > Expression: _BLOCK_TYPE_IS_VALID(pHead->nBlockUse)
> > > For information on how your program can cause an assertion
> > > failure, see the Visual C++ documentation on asserts.
> > > (Press Retry to debug the application)
> > > ---------------------------
> > > Abort   Retry   Ignore
> > > ---------------------------
> > > I understand that there might be a double delete or invalid deletion
> > > that is happening, but I can't point exactly where. The code that
> > > generates is attached as a CPP file.
> > > This must be something basic that I am missing, but I can't figure out
> > > from the boost.python documentation or the wiki. Can someone please
> > > point at what I am doing wrong?
> > >
> > > Thank You
> > > Gangadhar
> > > P.S:Also, ignore the fact that the 3rd party lib's static function is
> > > not exported in the Wrapper class as a member function. That is
> > > something that will be changed later.
> >
> > This is not a bug. If you want to debug your extension you will need
> > Python built in "debug" mode.
>
> > Try to compile your extension in release mode and it should work.
> > ( At least the example you attached )
>
> I am not sure about last 2 sentence. The wrapper class is very very strange.
>
>
> --
> Roman Yakovenko
> C++ Python language binding
> http://www.language-binding.net/
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