[C++-sig] Static Methods

Francois Ostiguy ostiguy at fnal.gov
Mon Nov 4 17:47:16 CET 2002


In a message on this list on July 5, Dave Abrahams said:

>We don't have a way to make true static methods yet.
>getDims will work fine if you access it through the class like this:
>    Nums.getDims()
>but not if you access it through the instance
>    n = Nums()
>    n.getDims() # error

I am assuming that the above statement remains true for the newly
released Boost.python v2.

I am trying to wrap the a static function Ring::initNodes().
(For reference, Ring is a class that inherits virtually from
other classes; I think this should be immaterial in the
present context).

When I import my module and try to run Ring::initValues(), here is what

>>> a = Ring()
>>> Ring.initValues()
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
AttributeError: type object 'orbit.Ring' has no attribute 'initValues'

As it should be ... however

>>> Ring.initNodes()
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: unbound method Boost.Python.function object must be called with
Ring instance as first argument (got nothing instead)

What am I missing ?

As always, help is greatly appreciated.


Dr. Jean-Francois OSTIGUY                              voice: (630) 840-2231
Beam Physics Dept MS220                                  FAX: (630) 840-6039
Fermi National Accelerator Laboratory                email: ostiguy at fnal.gov
Batavia IL 60510-0500                           WWW:www-ap.fnal.gov/~ostiguy

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