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From: Alisdair Meredith (alisdair.meredith_at_[hidden])
Date: 2003-06-10 11:54:13

Nigel Stewart wrote:

> To summarise:
> Possible resize policies:
> i. Capacity is fixed at compile time.
> ii. Capacity is fixed at construction time.
> iii. Capacity can be manually managed by client code.
> iv. Capacity is allowed to grow automatically. (ala std::vector)
> Possible insert handling policies:
> I. Insert into full buffer results in no change.
> II. Insert into full buffer results in overwriting opposite end.
> Insertion into arbitrary position overwrites beginning, if necessary.
> III. Insert into full buffer results in exception.
> Possible resize to smaller capacity policies:
> 1. Keep left-most items. (ala std::vector)
> 2. Keep right-most items.
> The general gist of some random googling on "circular buffers":
> - Automatic resizing does not appear to be common.
> - No established convention in relation to arbitrary insert.
> - No established convention in relation to resizing to smaller capacity.

Another distinction might be 'black box / white box', i.e. whether you
have public access to the iterators. If you are merely using a fixed,
circular buffer to stop your queue/stack reallocating, you may want to
hide them.

This is a relatively minor detail. Something I would address in a
policy-based implementation, but not in the 'best generalisation for
common cases'.


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