[C++-sig] How to create package structure in single extension module

[David Abrahams]

"Koen Van Herck" <koen_van_herck at yahoo.com> writes:

> Hello,
>
> I would like to do something similar as the example in
> http://www.boost.org/libs/python/doc/tutorial/doc/html/python/techniques.htm
> l#python.creating_packages:
>
>>>> import sounds
>>>> import sounds.io
>>>> import sounds.filters
>>>> sound = sounds.io.open('file.mp3')
>>>> new_sound = sounds.filters.echo(sound, 1.0)
>
> but, contrary to the example, by providing only a single sounds.pyd module.
> The reason is that I'm wrapping a library that uses multiple namespaces and
> I would like to expose these namespaces to Python. It's not possible though
> to split the library into different compiled entities.
> How can I do this using Boost.Python ?

Use the Python 'C' API to create module objects for io and filters,
and then stick them in the scope of your sounds module as follows:

    scope().attr("io") = io;
    scope().attr("filters") = filters;

And then you can go on to wrap things in those modules via:

    scope io_scope = io;

    class_<sounds::io::whatever>("whatever")
       ...
       ;

HTH,    
-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com