> On Dec 19, 2015, at 11:44 AM, Donnacha Oisín Kidney via swift-dev
> <swift-dev@swift.org> wrote:
>
> You can define an extension on interval types:
>
> extension HalfOpenInterval where Bound: Strideable {
> func by(n: Bound.Stride) -> StrideTo<Bound> {
> return start.stride(to: end, by: n)
> }
> }
>
> extension ClosedInterval where Bound: Strideable {
> func by(n: Bound.Stride) -> StrideThrough<Bound> {
> return start.stride(through: end, by: n)
> }
> }
>
> Which maybe gives you slightly more elegant usage:
>
> for lat in (CGFloat(-60)...60).by(30) {
> print(lat)
> }
>
> for lat in (CGFloat(-60)..<60).by(30) {
> print(lat)
> }
This is nice; why don't we put it in the standard library and get rid of the
"stride" methods?
>> On 19 Dec 2015, at 18:59, Gavin Eadie via swift-dev <swift-dev@swift.org
>> <mailto:swift-dev@swift.org>> wrote:
>>
>> With C-style for loops to be removed from the language to general acclaim
>> (including mine), is the following the best way to perform the required
>> looping:
>>
>> for lat in (CGFloat(-60.0)).stride(through: +60.0, by: 30.0) {
>> path.moveToPoint(CGPointMake(-180.0, lat))
>> path.lineToPoint(CGPointMake(+180.0, lat))
>> }
>>
>> for lon in (CGFloat(-150.0)).stride(through: +150.0, by: 30.0) {
>> path.moveToPoint(CGPointMake(lon, +90.0))
>> path.lineToPoint(CGPointMake(lon, -90.0))
>> }
>>
>> That seems a slightly cumbersome usage. Is there a better way to initialize
>> the SequenceType I want to iterate over?
>>
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-Dave
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