Re: Something like vector-grow available?

[Jost Boekemeier <jostobfe@calvados.zrz.TU-Berlin.DE>]

Telford Tendys <telford@eng.uts.edu.au> writes:

> AFAIK, no there is not. The implementation of a vector is a simple malloc()
> and the chances for a realloc() on that working without doing a copy are
> pretty small. The copy inside realloc() is faster than anything you write
> in scheme though. Adding a vector-grow function to guile might be nice for
> just that reason and possibly for the reason that some future implementation
> might be smarter.

I need it to dynamically grow the weak observer array.  Maybe I could
(ab-)use a weak hash table to hold the weak observers with the key
being the observer and the value always being #f.

Hmm, no.  The weak observer array is an array, not a dictionary type.
On the other hand i think it should also shrink when all weak
observers have been garbage collected.  Hmm, a weak list ... :)

This would all not be necessary if I could get a notification from
the garbage collector when a certain cell has been gc'ed.  I think
this is not possible at the moment.


Jost