Re: [Swig-user] Recognizing the same objects

[Daniel K. O. <dan...@gm...>]

2008/5/15 Dustin J. Mitchell <du...@zm...>:
> I had similar difficulties with Perl bindings.
>
> The basic answer is, "no."  SWIG's bindings will create a new Python
> object every time they are handed a pointer from the C/C++ layer.
>
> You can work around this by writing typemaps that will keep some kind
> of (weak-ref) dictionary of extant wrapped objects, and look up any
> new pointer values in that dictionary.  SWIG doesn't implement this
> itself as it's really fairly domain-specific.


I was hoping for something along these lines:

struct Foo {
    void *data;
    ...
};

And make the [SWIG] Foo constructor store a pointer to the SWIG object
in the [C++] Foo object. So the getFoo() function would be overwritten
as:

SwigFoo* getFooSwig()
{
    Foo *f = getFoo();
    swigobj = f->data;
    return swigobj;
}

Could this be done with the help of typemaps?


-- 
Daniel K. O.
"The only way to succeed is to build success yourself"