[swift-users] Cannot invoke 'stride' with an argument list of type '(from: Int, to: Int, by: Int)'

[Zhao Xin]

You are right. Int conforms to Strideable.

Now it seams like a bug. As in a playground. below are code works and
doesn't work

extension Int {

    func test() {

        let temp = stride(from:1, to:10, by:2) // error

    }

}


extension Float {

    func test() {

        let temp = stride(from:1, to:10, by:2) // error

    }

}


extension String {

    func test() {

        let temp = stride(from:1, to:10, by:2) // works

    }

}


class A {



}


extension A {

    func test() {

        let temp = stride(from:1, to:10, by:2) // works

    }

}


struct B {



}


extension B {

    func test() {

        let temp = stride(from:1, to:10, by:2) // works

    }

}


func test() {

    let temp = stride(from:1, to:10, by:2) //works

}


let temp = stride(from:1, to:10, by:2) // works


​It is nothing bug a bug?​


​Zhaoxin​



On Tue, Jul 5, 2016 at 10:16 PM, Shawn Erickson <shawnce at gmail.com> wrote:

> Int conforms to Strideable byway of Integer <- SignedInteger <- Int (not
> exactly sure how it will be once the integer proposal is implemented but it
> will still be strideable).
>
> -Shawn
>
> On Mon, Jul 4, 2016 at 10:38 PM Zhao Xin via swift-users <
> swift-users at swift.org> wrote:
>
>> In Swift 3,
>>
>> func stride<T : Strideable>(from start: T, to end: T, by stride:
>> T.Stride) -> StrideTo<T>
>>
>> Int does not conform to Strideable.
>>
>> Adopted By
>>
>> CGFloat
>> Decimal
>> Double
>> Float
>> Float80
>> String.UTF16View.Index
>> UnsafeMutablePointer
>> UnsafePointer
>>
>> ​In Swift 2.2,
>>
>> @warn_unused_result func stride(to *end*: Self, by *stride*: Self.Stride)
>> -> StrideTo<Self>
>>
>> It uses Self, which means the type of the variable, instead of T.
>>
>> Zhaoxin
>>
>> On Tue, Jul 5, 2016 at 11:41 AM, Adriano Ferreira via swift-users <
>> swift-users at swift.org> wrote:
>>
>>> Hi everyone!
>>>
>>> I’m converting some code to Swift 3 and got this issue?
>>>
>>>
>>>
>>>
>>> Does anybody know what’s going on?
>>>
>>> Here’s the code, before and after conversion:
>>>
>>>
>>> // Swift 2.2
>>> extension Int {
>>>
>>>     // Repeat a block of code from `self` up to a limit
>>>     func up(to upper: Int, by step: Int = 1, @noescape closure: () ->
>>> Void) {
>>>
>>>         for _ in self.stride(to: upper, by: step) {
>>>             closure()
>>>         }
>>>     }
>>> }
>>>
>>> // Swift 3
>>> extension Int {
>>>
>>>     // Repeat a block of code from `self` up to a limit
>>>     func up(to upper: Int, by step: Int = 1, _ closure: @noescape () ->
>>> Void) {
>>>
>>>         for _ in stride(from: self, to: upper, by: step) {
>>>             closure()
>>>         }
>>>     }
>>> }
>>>
>>>
>>> // Usage
>>> 1.up(to: 10, by: 2) {
>>>     print("Hi!")
>>> }
>>>
>>>
>>> Best,
>>>
>>> — A
>>>
>>> _______________________________________________
>>> swift-users mailing list
>>> swift-users at swift.org
>>> https://lists.swift.org/mailman/listinfo/swift-users
>>>
>>>
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>
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