[Ecls-list] Collecting foreign data

Stanislav Frolov frolosofsky at gmail.com
Fri Jun 22 11:06:02 UTC 2012

2012/6/22, Matthew Mondor <mm_lists at pulsar-zone.net>:
> On Fri, 22 Jun 2012 10:59:55 +0400
> Stanislav Frolov <frolosofsky at gmail.com> wrote:
>> Hi! I use ECL as an embed script for my application. I need to store a
>> foreign pointer and I would like to tell gc to collect it. Well, I can
>> do:
>> ...
>> cl_object cl_data = ecl_make_pointer(new my_type);
>> ...
>> (some (lisp 'code (with cl_data)))
>> ...
>> After that I can directly call back in C++ and delete cl_data:
>> cl_object my_type_delete(cl_object x){
>>  delete (my_type*)ecl_to_pointer(x);
>>  return Ct;}
>> But it is inconvenient in many cases. Is there a way to tell gc to
>> collect cl_data and to call my_type_delete when it is deleting the
>> holder of my pointer?
> I'm not sure that this is exactly what you're looking for, but ECL can
> be told to "finalize" an object.  We cannot predict when finalization
> will take place, but the GC will eventually do it as part of its
> collection process if it's no longer referenced.  See EXT:SET-FINALIZER
> (or ecl_set_finalizer_unprotected(), si_set_finalizer())...
> Another special thing are "weak pointers" (see EXT:MAKE-WEAK-POINTER
> and EXT:WEAK-POINTER-VALUE, or si_make_weak_pointer(), etc).  The
> special property of these are that unlike other references, these do
> not protect the referenced objects from collection by the garbage
> collector (obviously to use with caution).
> --
> Matt
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Thank you, Matt! I just miss finalization section in the ECL manual.

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