On Jul 5, 2016, at 12:00 PM, Zhao Xin <owenzx@gmail.com> wrote:
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@gmail.com <mailto:shawnce@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@swift.org <mailto:swift-users@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@swift.org <mailto:swift-users@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
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