Hi Erica,
Wouldn’t this work for @tuuranton’s purposes?
let allUInt8s = UInt8.min.stride(through: UInt8.max, by: 1)
allUInt8s.dynamicType // StrideThrough<UInt8>.Type
Array(allUInt8s).count // 256
for i in allUInt8s {
i // 0...255
}
milos
> On 8 Apr 2016, at 13:48, tuuranton--- via swift-users <swift-users@swift.org
> <mailto:swift-users@swift.org>> wrote:
>
> The problem with both solutions is that I lose the type information. Instead
> of i being UInt8 it is Int or UInt.
>
> This is one solution I came up with:
>
> extension UInt8 {
> static var allValues: [UInt8] {
> var v: [UInt8] = []
> for i in 0..<UInt8.max {
> v.append(i)
> }
> v.append(UInt8.max)
> return v
> }
> }
>
> print(UInt8.allValues)
>
> In other words, loop from 0 to 254 and then add 255 manually at the end.
>
> Is there currently no simpler way to do this in Swift?
>
> Idea for the Swift developers: Create a Bounded protocol that UInt8 (and the
> other integer types) conform to. Then add a "allValues" type method in that
> protocol. And also put .min and .max into that protocol. Currently it seems
> like .min and .max are not a part of any particular protocol.
>
>
> 8. Apr 2016 14:35 by swift-users@swift.org <mailto:swift-users@swift.org>:
>
> You could cast the min and max values to an Int and iterate through the Int
> range:
>
> let min = Int(UInt8.min)
> let max = Int(UInt8.max)
>
> for i in min...max {
> print(i)
> }
>
> While this will work it seems like a hack to me and Milos’ solution is more
> elegant…
>
> -Pete
>
>
> On Apr 8, 2016, at 5:50 AM, tuuranton--- via swift-users
> <swift-users@swift.org <mailto:swift-users@swift.org>> wrote:
>
> I forgot to mention that I really would like to have i have type UInt8 within
> the loop. And since i is UInt8 it makes sense it should be able to take the
> values UInt8.min and UInt8.max (and all the values between).
>
> 8. Apr 2016 11:48 by swift-users@swift.org <mailto:swift-users@swift.org>:
>
> print(UInt8.min) //0
>
> print(UInt8.max) //255
>
>
>
> //Is there an easy way to loop between all values
>
> //between (and including both) UInt8.min and UInt8.max?
>
>
>
> //This doesn't work.
>
> //Runtime crash because UInt8.max has no successor.
>
> for i in UInt8.min...UInt8.max {
>
> print(i)
>
> }
>
>
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> On 8 Apr 2016, at 15:21, Erica Sadun via swift-users <swift-users@swift.org>
> wrote:
>
>>
>> On Apr 8, 2016, at 3:48 AM, tuuranton--- via swift-users
>> <swift-users@swift.org <mailto:swift-users@swift.org>> wrote:
>>
>> print(UInt8.min) //0
>>
>> print(UInt8.max) //255
>>
>>
>>
>> //Is there an easy way to loop between all values
>>
>> //between (and including both) UInt8.min and UInt8.max?
>>
>>
>>
>> //This doesn't work.
>>
>> //Runtime crash because UInt8.max has no successor.
>>
>> for i in UInt8.min...UInt8.max {
>>
>> print(i)
>>
>> }
>>
>>
>
> Easy? No.
>
> // Range Index has no valid successor
> for i in UInt8.min ... UInt8.max {
> print(i)
> }
>
> // '...' cannot be applied to two 'UInt8' operands
> for i in UInt8.min ... UInt8.max as ClosedInterval {
> print(i)
> }
>
> // Stops at 254
> for i in UInt8.min ..< UInt8.max {
> print(i)
> }
>
>
> This works, but ugh:
>
> for i : Int in numericCast(UInt8.min)...numericCast(UInt8.max) {
> guard let j: UInt8 = UInt8(i) else { fatalError("Nope") }
> print(j)
> }
>
> cc'ing in a few people to the white courtesy range phone.
>
> -- E
>
>
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> swift-users@swift.org <mailto:swift-users@swift.org>
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