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Subject: Re: [boost] [pool2] Requests for comment
From: DUPUIS Etienne (e.dupuis_at_[hidden])
Date: 2012-10-18 02:27:25


> De la part de Cory Nelson
> Envoyé : mardi 16 octobre 2012 16:28
> - An arena allocator: to allocate any-sized objects from, but only deallocate all
> at once.

I will take care to have this use case optimized as you are not the first one to request it.

> - Allow an arena/pool allocator to draw its storage from another pool.

It will be the case.

> - Configurable allocation efficiency. For instance, boost::pool will find the
> least common multiple of page size and block size, which can result in huge
> allocations in the name of not wasting any memory. Sometimes I might want
> this, other times I'd be OK wasting a handful of bytes out of every page if it
> means more reasonably sized initial allocations.

The 'least common multiple problem' present in boost::pool was fixed in a recent version of boost. I hopefully will not repeat the same error!

> - Configurable alignment. Very useful for eg. AVX instructions, which can
> require 32-byte data alignment.

I agree; it is a pain that Microsoft's malloc() function still returns 8-byte aligned buffers.

> - (Maybe) If you've got an object allocator, have a policy setting that disables
> calling destructors. Not sure if this belongs in the library due to shooting-
> own-foot-off potential, but there have been instances where I don't care
> about destructors because I know all the resources are associated with the
> pool. In this case an object allocator would become a glorified wrapper for
> placement new.

Let me complete the API and implementation before looking into these more 'exotic' features...

Thanks for your comments,

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