Self.Index.Distance to Int?

Question

Created Jul ’15

Replies 2

Boosts 0

Views 3.9k

Participants 2

           let count = weatherArray.count
           let arrayPositionFloat = CGFloat(count) * sliderValue

This is in a protocol extension.

weatherArray is CollectionType.

sliderValue is CGFloat

I need to do multiplikation of Self.Index.Distance (which should be alias for Int) and CGFloat (which is sliderValue) but it does not work.

The compiler complains:

"Binary operator '*' cannot be applied to two CGFloat operands."

It does not make sense. Any help appreciated.

Boost

Answer 1

Jul ’15

Accepted Answer

CollectionType.Index.Distance defaults to Int, but may not always be Int.

As CollectionType.Index can be any subtype of ForwardIndexType, CollectionType.Index.Distance must be a subtype of _SignedIntegerType.

Which means you can write something like this:

    let count = weatherArray.count.toIntMax()
    let arrayPositionFloat = CGFloat(count) * sliderValue

0

Answer 2

Jul ’15

Thanks a lot!

0