Although discussion has moved on to better solutions...
At Sun, 22 Jan 2012 14:14:47 -0700, Michael W wrote:
> If I say:
>
> (cast
> (malloc _OggVorbis_File)
> _pointer _OggVorbis_File-pointer)
>
> ...That's bad -- because I never keep the original pointer
> returned by the (malloc) call, the garbage collector reclaims
> that memory even though the _OggVorbis_File-pointer still points
> to it.
To fix this cast, use `_gcpointer' as the source type and `_gcable' on
the result pointer type:
(cast
(malloc _OggVorbis_File)
_gcpointer
(_gcable _OggVorbis_File-pointer))
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