Null reference

Hello all,

I ran into a problem, but not sure whether it is a SWIG or Python problem.

This is a simplest class with operator == defined:

// v.h
class v
{
   public:
      v(const int a) : data(a) {}
      bool operator==(const v& u) const {return data == u.data;}
      int data;
};

% python
Python 2.2.2 (#1, Feb 10 2003, 00:23:53)
[GCC 3.2 20020903 (Red Hat Linux 8.0 3.2-7)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import mod
>>> None in (mod.v(1), None)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "mod.py", line 38, in __eq__
    def __eq__(*args): return apply(_mod.v___eq__,args)
TypeError: null reference

This error does not occur if operator == is not defined.  Why == is called here 
anyway?

Could anyone help?  Thanks.

Zhong





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