[PD] deconstructors in pd externals

[Martin Peach]

Peter Worth wrote:
> hi,
>
> i'm writing an external that requires a lot of memory freeing when it
> is destroyed, but i cant find much in the way of documentation telling
> me how to set up a deconstructor.
>
> at the moment i'm doing this:
>
> extern "C" __declspec( dllexport ) void markovchain_tilde_setup(void)
> {
>     markovchain_tilde_class = class_new(gensym("markovchain~"),
>     (t_newmethod)markovchain_tilde_new,
>     (t_method)markovchain_tilde_destroy,
>     sizeof(t_markovchain_tilde),
>     CLASS_DEFAULT,
>     A_GIMME, 0);
>     class_addmethod(markovchain_tilde_class,
>     (t_method)markovchain_tilde_dsp, gensym("dsp"), 0);
> }
>
> with a deconstructor like this:
>
> void *markovchain_tilde_destroy()
> {
> ....
>
> but obviously this is no good because i need access to the dataspace
> struct. so how do i pass a reference to the struct to the
> deconstructor?
>
Declare the deconstructor as
void markovchain_tilde_destroy(t_markovchain_tilde *x)
and keep pointer(s) to the disposable memory somewhere in x.
Martin

> thanks,
> pete.
>
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