[m-rev.] proposed changes to set modules in stdlib

[Peter Wang]

On 2010-11-09, Julien Fischer <juliensf at csse.unimelb.edu.au> wrote:
> 
> Hi,
> 
> Based on Peter's table here is a set of proposed changes to the various
> set modules in the stdlib with the aim of unifying their interfaces.
> 
> We can probably get away with breaking backwards compatibility
> for all of them except for set.m / svset.m (so I've done that).
> 
> Also, where there are predicate and function versions of an operation
> I've only retained the predicate version where it is useful with
> state variables.

I usually reach for a predicate first, then get told off by the
compiler.  The conventional function form breaks the left-to-right flow
in Mercury code: inputs on the left, outputs on the right.  I'm often
tempted to write `f(A, B, C) = R' instead.

Peter
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