[m-rev.] for review: add transform_value predicate to map.

[Mark Brown]

On 12-Jan-2005, Ian MacLarty <maclarty at cs.mu.OZ.AU> wrote:
> For review by anyone.
> 
> Estimated hours taken: 2
> Branches: main
> 
> Add transform_value predicate to map, tree234 and rbtree.  This applies
> a higher order argument to a value in the map.  Often a value needs to be 
> updated using its previous value, currently requiring two lookups of the
> key.  With transform_value only one lookup is required.

That looks fine.

Cheers,
Mark.

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