[PD-dev] Destructor in external classes

[IOhannes m zmölnig]

On 03/24/2014 02:22 PM, Funs Seelen wrote:
> Hello all,
> 
> While reorganizing my code a question about memory management in Pd arose
> in me. If I allocate memory within the constructor space, do I have to free
> this myself? 
yes

> If yes, how or where should I do this?

the destructor is called "free_method" in Pd-lingo and is set via
class_new() [1].

so you basically would do:

void myclass_free(t_myclass*x) {
   free(x->x_ptr);
}
// ...
void myclass_setup(void) {
  class_new(gensym("myclass"), myclass_new, myclass_free,
sizeof(t_myclass), 0, ...);
}


> Do I have to worry about this or is all memory freed automatically when an
> object is removed from its canvas?

no magic is involved, thus you have to take care yourselves.

mdsa
IOhannes


[1] http://iem.at/pd/externals-HOWTO/node9.html#SECTION00092100000000000000

> 
> Example:
> 

> 
> Any hints?
> 
> Regards,
> Funs
> 
> 
> 
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> 


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