Re: How to add code to a C wrapper function generated by SWIG (for Python)

Yes, that's the point - to prevent the generation of the wrapper. The
destructor is then implemented using %extend.

The reason I remember this approach is that I had to fix up some code a
couple of years ago that had done something like this. I ran into issues
because of a Swig upgrade. There is a small thread in the archives:
https://sourceforge.net/p/swig/mailman/message/36465099/

It was someone else's code I was fixing up. I am not an expert on this, and
it might not be the right approach, but I thought I would mention in case
it might be useful in this case.

On Fri, 22 Jan 2021 at 10:38, Rokas Kupstys via Swig-user <
[email protected]> wrote:

> How would that work? %ignore would prevent generation of wrappers for
> ignored thing. I dont see how ignored destructor would then be called by
> wrapper code at appropriate time.
>
> -- Rokas Kupstys
>
> On 2021-01-22 12:12, Ian Boyd wrote:
>
> Another option I think I have seen before is to use %ignore to prevent
> Swig from generating a destructor and then use %extend to implement a
> custom one.
>
> On Fri, 22 Jan 2021 at 10:00, Rokas Kupstys via Swig-user <
> [email protected]> wrote:
>
>> Maybe %newobject + %newfree typemaps would work for you in this case?
>>
>> -- Rokas Kupstys
>>
>> On 2021-01-22 10:48, lille stor wrote:
>>
>> Hi,
>>
>> When generating a Python wrapper using SWIG, many C wrapper functions are
>> generated. One of them is called "_wrap_delete_Cursor" which looks
>> like this (I have stripped it to the bare minimum):
>>
>>    SWIGINTERN PyObject *_wrap_delete_Cursor(PyObject *self, PyObject *args) {
>>
>>        // some generated C code by SWIG
>>
>>        // need to add code to call a C function to release allocated memory
>>
>>    }
>>
>> This function is called when the object Cursor (created in Python) no
>> longer exists. Now, my problem is that I have some allocated memory on the
>> C side that needs to be released before existing the function (otherwise,
>> there will be memory leaks).
>>
>> Do you know how I can add a line of code this function to release memory?
>> All help is really welcome!
>>
>> L.
>>
>>
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