[m-dev.] Adding Loops to Mercury

[Julien Fischer]

On Thu, Jan 2, 2014 at 7:26 PM, Paul Bone <paul at bone.id.au> wrote:

> On Thu, Jan 02, 2014 at 06:20:27PM +1100, Julien Fischer wrote:
> > On Thu, Jan 2, 2014 at 5:50 PM, Michael Day <mikeday at yeslogic.com>
> wrote:
> >
> > > Hi Paul,
> > >
> > >
> > >  foreach I=std::fromTo(1,1000) do
> > >>>     %...whatever
> > >>> end foreach.
> > >>>
> > >>
> > >> I think that such a feature would be considered "not in the spirit of
> > >> Mercury" by most developers.
> > >>
> > >
> > > Light syntax and efficient compilation for lambdas is enough:
> > >
> > >     foreach(1 `..` 100, func(X) = blah)
> >
> >
> > Which is pretty much already supported, e.g.
> >
> >       map(func(X) = X * 2, 1 `..` 100)
> >
> > (Use a quantifier like foreach seems like the wrong name to use
> > for some that is transform the list of integers using a function.)
>
> foreach would be a predicate that is very similar to list.foldl.
>

It wouldn't, you would need to provide the initial value of the accumulator
somewhere.  In any case, my point was that foreach is not a good name
for such a thing.

Cheers,
Julien.
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