Greedy memory handling

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On Wednesday, 11 September 2013 at 08:06:37 UTC, monarch_dodra 
wrote:
> I have a function that will *massively* benefit from having a 
> persistent internal buffer it can re-use (and grow) from call 
> to call, instead of re-allocating on every call.
>
> What I don't want is either of:
> 1. To set a fixed limitation of size, if the user ends up 
> making repeated calls to something larger to my fixed size.
> 2. For a single big call which will allocate a HUGE internal 
> buffer that will consume all my memory.
>
> What I need is some sort of lazy buffer. Basically, the 
> allocation holds, but I don't want the to prevent the GC from 
> collecting it if it deems it has gotten too big, or needs more 
> memory.
>
> Any idea on how to do something like that? Or literature?

I do not know if it fits, but I had a similar problem some time 
ago:
http://forum.dlang.org/thread/wsxajhlsupnraevowcgd@forum.dlang.org