On 02/08/2010 02:02 AM, Ralf W. Grosse-Kunstleve wrote:
if (obj) ...
is definitely the right way to do it.
Sorry to correct, but it isn't equivalent to "obj is None".
if (obj) uses PyObject_IsTrue(); see
boost/python/object_operators.hpp line 60.
Oh, thanks for the correction !
I guess PyObject_IsTrue() returns false for None, so it may just have
worked by coincidence in the past. But yes, there is a need to
disambiguate between Py_False and Py_None.
I'll add
obj.is_none()
and
obj.is_not_none()
when I get a chance.
Thanks. I don't think there is a need for more than one addition,
though. I.e., "obj.is_not_none()" is redundant, and could be spelled
simply "!obj.is_none()". (Or in fact, "obj.is_none()" may just be the
same as "obj == object()", though the latter is a little wasteful.
Thanks,
Stefan
--
...ich hab' noch einen Koffer in Berlin...
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