Re: [boost] ASIO into the standard

Subject: Re: [boost] ASIO into the standard
From: Niall Douglas (s_sourceforge_at_[hidden])
Date: 2014-07-11 05:44:22

On 10 Jul 2014 at 23:48, Felipe Magno de Almeida wrote:

> > Nor are allocators consistently used for internals of STL containers.
> > They have to be used for the type being stored of course, but
> > internal data structures not exposed to external code may use any
> > allocator e.g. malloc().
> 
> I thought this only applied to non-templated-on-allocator types.
> For example, list must use the allocator passed, rebound of course,
> to allocate its node. Or am I completely mistaken?
> If so then allocators are just fairy tale.

Of course it must. But if some implementation of list decided to keep 
some internal housekeeping data, it could use malloc or any other 
kind of allocator. For example some debug enhanced implementations 
keep additional debug info.

The concurrent_unordered_map I am currently experimenting with uses 
the externally supplied allocator to allocate the value_type, but 
uses the default allocator for the bucket allocation. I believe this 
is permitted.

Niall

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