[C++-sig] Avoiding implicit boost::python::extract<> conversions

Ralf W. Grosse-Kunstleve rwgk at yahoo.com
Thu Apr 7 19:12:38 CEST 2011

If you add the undocumented (sorry) define


Boost.Python will not convert bool to int and vice versa.
I have been working with this define for a couple years now
with a good experience.

(The main reason for the define to be undocumented is that
the tests need to be adjusted, which I never found the time for.)

----- Original Message -----
> From:Murray Cumming <murrayc at murrayc.com>
> To:cplusplus-sig at python.org
> Cc:
> Sent:Thursday, April 7, 2011 7:02 AM
> Subject:[C++-sig] Avoiding implicit boost::python::extract<> conversions
> It looks like boost::python::extract<bool>::check() will happily succeed
> on an int python object, and boost::python::extract<int>::check() will
> likewise succeed on a bool python object.
> Is there an easy way to discover the actual python type so I can really
> get the data I want in the correct type?
> -- 
> murrayc at murrayc.com
> www.murrayc.com
> www.openismus.com
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