[swift-users] Filling two type parameters with the same type

[Zhao Xin]

No, David, it is now allowed.  "error: same-type requirement makes generic
parameters 'Source' and 'Displacement' equivalent".

Zhao Xin

On Sun, Jul 9, 2017 at 12:35 PM, David Sweeris via swift-users <
swift-users at swift.org> wrote:

> You could try putting that init in an extension "where Source ==
> Displacement"
>
> > On Jul 8, 2017, at 21:06, Taylor Swift via swift-users <
> swift-users at swift.org> wrote:
> >
> > I have a type like
> >
> > struct DistortedNoise<Source, Displacement> where Source:Noise,
> Displacement:Noise
> > {
> >     let source:Source,
> >         displacement:Displacement
> >
> >     init(source:Source, displacement:Displacement)
> >     {
> >         self.source       = source
> >         self.displacement = displacement
> >     }
> >
> >     init(source:Source)
> >     {
> >         self.source       = source
> >         self.displacement = source
> >     }
> > }
> >
> > and I get the error
> >
> > Compile Swift Module 'Noise' (5 sources)
> > /home/taylor/noise/sources/noise/noise.swift:576:29: error: 'Source' is
> not convertible to 'Displacement'
> >         self.displacement = source
> >                             ^~~~~~
> >
> > How do I tell Swift that I want the same type fulfilling both Source and
> Displacement?
> >
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