[swift-users] expression too complex

[Saagar Jha]

I’ve seen that this tends to happen with operators that are really
overloaded-stuff like +, *, etc. The compiler seems to take longer to
figure out which function to use.

On Mon, Jun 6, 2016 at 3:09 PM Joe Groff via swift-users <
swift-users at swift.org> wrote:

>
> > On Jun 6, 2016, at 3:06 PM, G B via swift-users <swift-users at swift.org>
> wrote:
> >
> > Is progress being made on the type checker to get the compiler to stop
> whinging about the complexity of expressions?
>
> Yes, a lot of cases work much better in Swift 3. You might give these a
> try in a nightly build. Please file a bug if you continue to see this in
> Swift 3 though.
>
> -Joe
>
> >
> > I can’t really trim down the full project to isolate a good test case,
> but I’m getting a compiler error on this line of code:
> > let v=T.Vector4Type([axis[0]*s, axis[1]*s, axis[2]*s, cos(a/2.0)])
> >
> >
> > Interestingly, this line compiled fine (everything is the same except
> the last list element is moved to the front):
> > let v=T.Vector4Type([cos(a/2.0), axis[0]*s, axis[1]*s, axis[2]*s])
> >
> >
> >
> > The initializer that this code is embedded in is this:
> > public init(axis:T.Vector3Type, angle a:T){
> >    let s=sin(a/2.0)
> >    let v=T.Vector4Type([axis[0]*s, axis[1]*s, axis[2]*s, cos(a/2.0)])
> >    let l=v.length()
> >    self.init(v/l)
> > }
> >
> > I’m running this in a playground, I don’t know if that makes a
> difference.
> >
> > I’m willing to wait a little longer for the complier to do its job if it
> means I don’t have to break my code down to one operation per line.
> > _______________________________________________
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> > swift-users at swift.org
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>
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>
-- 
-Saagar Jha
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