Re: BPL: How do you actually return a vector from your class?

From: rwgk_at_[hidden]
Date: 2001-05-03 19:02:16

I do not know the answer to your question regarding your wrapper
idea. Have you tried this and it failed?

I do, however, have another suggestion: You could also use
the method demonstrated in do_it_yourself_converters.cpp.
Related code that could serve as an example:

http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/cctbx/cctbx/

./cctbx/basic/boost_array_bpl.h
./global/boost_array_bpl.cpp

If you just want to map to and from native Python types,
this should work fine.

Another alternative to consider is to wrap vector<yourchoice>
in the standard way and provide an explicit ".as_tuple()"
method. You could use the cross-module support to use this
in more than one extension module. This approach is more
heavy-weight, but avoids mapping to and from native
Python types unless you explicitly request this. If your
vectors are large, this could be a significant overhead.

Ralf

--- In boost_at_y..., rcspython_at_y... wrote:
> I have looked at the simple_vector.cpp file. My question is how do 
> you actually incorporate this functionality into an existing class?
> I very much want to return a vector from MY C++ class.
> 
> I have a private member
> 
> std::vector<double> myvect;
> 
> Do I have to vector_double_wrapper myvect; instead?
> And then...
> public:
>   vector_double_wrapper GetVector(void){ return myvect;};
> 
> Then add this to the class myclass.def(GetVector,"GetVector")?
> 
> I appreciate that I cannot simply return a raw vector but and not 
> sure about how to hook up the plumbing.
> 
> I am having a terrible mental block... don't laugh. ;p
> 
> 
> Thanks,
> Ron