[Numpy-discussion] creating/working NumPy-ndarrays in C++

[Erin Sheldon]

Excerpts from Holger Herrlich's message of Tue Apr 03 09:06:09 -0400 2012:
> 
> Hi, I plan to migrate core classes of an application from Python to C++
> using SWIG, while still the user interface being Python. I also plan to
> further use NumPy's ndarrays.
> 
> The application's core classes will create the ndarrays and make
> calculations. The user interface (Python) finally receives it. C++ OOP
> features will be deployed.
> 
> What general ways to work with NumPy ndarrays in C++ are here? I know of
> boost.python so far.

Hi Holger -

I put together some header-only classes for this back when I used to do
a lot of C++ and numpy.  

They are part of the "esutil" package but you could actually just pull
them out and use them http://code.google.com/p/esutil/

The first is a template class for numpy arrays which can create and
import arrays and keeps track of the reference counts

http://code.google.com/p/esutil/source/browse/trunk/esutil/include/NumpyVector.h

The second is similar but for void* vectors so the type can be
determined at runtime

http://code.google.com/p/esutil/source/browse/trunk/esutil/include/NumpyVoidVector.h

There is also one for record arrays

http://code.google.com/p/esutil/source/browse/trunk/esutil/include/NumpyRecords.h

Hope these are useful or can give you some ideas.
-e
-- 
Erin Scott Sheldon
Brookhaven National Laboratory