[C++-sig] C++ object pointers contained in a vector

[Roman Yakovenko]

On 10/18/06, Noah Schwartz <noah.schwartz1 at gmail.com> wrote:
> On Wednesday 18 October 2006 16:28, Roman Yakovenko wrote:
> > On 10/18/06, Noah Schwartz <noah.schwartz1 at gmail.com> wrote:
> > > On Wednesday 18 October 2006 16:09, Roman Yakovenko wrote:
> > > > On 10/18/06, Noah Schwartz <noah.schwartz1 at gmail.com> wrote:
> > > > > Hi,
> > > > >
> > > > > I've used the vector_indexing_suite to expose vectors containing
> > > > > pointers to some class. I see that I can't iterate over this vector
> > > > > in Python like I can with say, a vector of floats. I get the
> > > > > following error: TypeError: No to_python (by-value) converter found
> > > > > for C++ type: MyClass*
> > > > >
> > > > > MyClass is already exposed properly. I can even use a MyClass* fine
> > > > > in Python when other C++ functions return a pointer to one.
> > > > >
> > > > > I am guessing that I need to define a to_python converter either in
> > > > > MyClass or in a new class, MyClass*. Not really sure how that works
> > > > > though.
> > > >
> > > > Try to set NoProxy to true
> > > >
> > > > http://boost.org/libs/python/doc/v2/indexing.html#indexing_suite
> > > >
> > > > Does it help?
> > >
> > > So, something like this?
> > > class_<std::vector<MyClass *> >("VectorMyClassP")
> > >                 .def(vector_indexing_suite<std::vector<MyClass *>, true
> > > >()) ;
> > >
> > > Same problem...
> > >
> > :-(, for some reason I thought this would work:
> >
> > Take a look on this post:
> > http://aspn.activestate.com/ASPN/Mail/Message/cpp-sig/2261029
> >
> > I am not sure about indexing suite v2, because you can change call
> > policies: return_internal_reference.
> >
> > You can find documentation for indexing suite v2 here:
> > http://tinyurl.com/yndgbw
>
> Seems to indicate that I need to use shared_ptr's instead of regular
> pointers...
>
> Unfortunately I have thousands and thousands of line of C++ code all
> written -- none of which use shared_ptrs. I have never used a shared_ptr but,
> I get the feeling that I am going to have to change a lot of code and retest
> everything :(

Wait a little, I will try indexing suite v2 for you.

-- 
Roman Yakovenko
C++ Python language binding
http://www.language-binding.net/