Is it possible to force table allocation?

Asked by Scott J Kolodzieski on 2012-11-05

I am experimenting with your container templates and have a question.

Is there a way to have the hash tables initialize when doing a reserve()? Although that ensures that the hash table is not resized again, it seems to be initialized on the first insertion, and that operation is taking a very long time, thus giving me extremely high latencies for the first insert. I would like to get the allocation/setup done on the reserve, thus ensuring a low latency on the first insert.

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Paul Pogonyshev (doublep) said : #1

No, there is no trivial way to do that currently (1.6).

The simplest workaround I can think of is to insert an element and immediately erase it. Tables are written in such a way they will not
drop the allocated memory on erasing the last element, they do it only if you call reserve() or a similar function afterwards.

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