Scott A. Smith wrote:

> David wrote:
> 
> >A static member function is just a regular function; you can add it at
> >module scope:
> >
> >BOOST_PYTHON_MODULE_INIT(numTest)
> >{
> >   def("getDims", &Num::getDims);
> >   ...
> >}
> >
> 
> Yep, this compiles just fine, but that is not the problem. 
> Unfortunately, I cannot call it from Python without errors.
> Here is what happens when I added the code to the hello example
> (Cygwin/GCC BPV2):
> 
> $ python
> Python 2.2.2 (#1, Nov 15 2002, 07:49:04)
> [GCC 2.95.3-5 (cygwin special)] on cygwin
> Type "help", "copyright", "credits" or "license" for more information.
> 
> >>>from hello import *
> >>>X = Num()
> >>>print X.dims()
> >>>
> 5
> 
> >>>print X.getDims()
> >>>
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
> TypeError: bad argument type for built-in operation
> 
> >>>print Num().getDims()
> >>>
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
> TypeError: bad argument type for built-in operation
> 
> >>>print Num.getDims()
> >>>
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
> TypeError: unbound method Boost.Python.function object must
> be called with Num instance as first argument (got nothing instead)
> 

You are exposing a function, not a member function, so you should call 
it like this from python:

 > >> print getDims()

If that bothers you, you can:

1) Export it as "Num_getDims" instead of "getDims". It might be acceptable.


2) Create a static function on the python side, like this:

 > >> from hello import *
 > >> Num.getDims = staticmethod(getDims)
 > >> print Num.getDims()


3) Wait for David to implement the new facility to export static 
functions, which he said he would do as soon as he could, IIRC.

> Thanks, Scott
> 

Best Regards,
Nicodemus.




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