[m-rev.] for review: Add take_while and drop_while to the list module

[Paul Bone]

On Thu, Apr 21, 2016 at 11:55:58AM +1000, Mark Brown wrote:
> Hi Paul,
> 
> On Thu, Apr 21, 2016 at 11:11 AM, Paul Bone <paul at bone.id.au> wrote:
> > For review by anyone
> >
> > ---
> >
> > Add take_while and drop_while to the list module
> 
> Are you aware there is already a takewhile predicate in the list module?
> 

No I wasn't, it looks like it behaves differently anyway.

I noticed that in our YesLogic code we have some utility code that can be
put into the Mercury standard library, including a dropwhile predicate.  So
I named it drop_while and submitted it and an similar take_while predicate.

I don't really mind what happens, does anyone else have any strong ideas
about these kinds of predicates?


-- 
Paul Bone