[swift-evolution] [Pitch] Support for pure functions. Part n + 1.

[Florent Vilmart]

We were discussing the topic yesterday with others and some suggested adding a pure keyword, for improved readability, just before the function declaration:

Ex:

pure func(a:Some) -> Else {}

On Feb 17, 2017, 11:51 AM -0500, Matthew Johnson via swift-evolution <swift-evolution at swift.org>, wrote:
>
> > On Feb 17, 2017, at 10:46 AM, David Sweeris via swift-evolution <swift-evolution at swift.org (mailto:swift-evolution at swift.org)> wrote:
> >
> > On Feb 17, 2017, at 08:21, Adrian Zubarev via swift-evolution <swift-evolution at swift.org (mailto:swift-evolution at swift.org)> wrote:
> >
> > >
> > > I haven’t yet read all the feedback in this topic but I’d like to throw some bikeshedding of mine into the room. :)
> > >
> > >
> > > How about this?
> > >
> > > Version 1: func(pure) …
> > > Version 2: func label(…) ~> ReturnType
> > >
> > >
> > >
> >
> > Version 2 is going to upset those who use "~>" as an operator.
> >
> > As the # of possible attributes grows, having an obvious grouping mechanism for them, like version 1, might be worthwhile simply to help make the list clearer. What about allowing "@(list, of, attributes)" instead of "@list, @of, @attributes”?
>
> That would be a little bit awkward for attributes that are parameterized. And if we did do this we should allow the parens to be omitted when there is only one attribute.
> >
> > - Dave Sweeris _______________________________________________
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>
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