finish function for output ranges

[Russel Winder]

On Sat, 2012-08-11 at 19:29 -0400, Andrei Alexandrescu wrote:
[…]
> I think (2) is a much more fertile view than (1) because the notion of 
> "reduce" emphasizes the accumulation operation (such as "+"), and that 
> is a forced notion for hashes (we're not really adding stuff there). In 
> contrast, the notion that the hash accumulator is a sink is very 
> natural: you just dump a lot of stuff into the accumulator, and then you 
> call finish and you get its digest.

One could also consider the hash generator to be a builder, which would
support 2 rather than 1.

-- 
Russel.
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Dr Russel Winder      t: +44 20 7585 2200   voip: sip:russel.winder at ekiga.net
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