__swig__slots__ on shadowed Python classes?

Dear all,

I'd like to have something like __slots__ on the shadow Python classes 
being generated by swig.

Suppose you have:

struct foo
{
        char bar[MAX_BAR];
} FOO;

and you swig it with -shadow, and in Python you do:

f = FOO()
f.baz = '123'

then this assignment will blissfully go ahead, but your C library, when 
being passed f, will not do what you want.

This error is sometimes amazingly hard to find (between Python modules, its 
a nuisance, but between a Python modules and other people's C libraries, it 
can become taxing - today, I had to revert to an ISDN D-channel protocol 
analyzer to get me back on track. And the last time I made the same error, 
it also took me a long time).

Performing a check whether the attribute exists in the underlying C 
structure seems simple[1] to implement and I can volunteer a patch if it 
has any chance of being accepted.

I'd be happy if the behaviour I described could be turned on with an 
additional commandline argument to swig, like -strict (only valid in 
conjunction with -shadow) or -shadow-strict.

I'd be really pleased, of course, if this would be made default behaviour.

The behaviour could even be turned on/off for individual classes, but this 
seems complete overkill.

I'd appreciate any feedback.

- Lars

[1]:

I rewrote _swig_setattr to:

def _swig_setattr(self,class_type,name,value):
    if (name == "this"):
        if isinstance(value, class_type):
            self.__dict__[name] = value.this
            if hasattr(value,"thisown"): self.__dict__["thisown"] = 
value.thisown
            del value.thisown
            return
    if name not in ['this', 'thisown', '__class__'] and \
       name not in class_type.__swig_slots__:
        raise AttributeError, name
    method = class_type.__swig_setmethods__.get(name,None)
    if method: return method(self,value)
    self.__dict__[name] = value

and (manually) added __swig_slots__ to the wrapper classes.

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