+1
An example I ran in to today:
func dumpKeys<T>(of object: T, _ keypaths: PartialKeyPath<T>...) {
for kp in keypaths {
print("-", "\(kp): \(object[keyPath: kp])")
}
}
Then in LLDB, I want to be able to write:
dumpKeys(of: context, \.invalidateEverything, \.invalidateDataSourceCounts)
But the PartialKeyPath expressions are considered ambiguous :(
- Karl
> On 12. Jan 2018, at 02:20, Kenny Leung via swift-users
> <[email protected]> wrote:
>
> Filed as https://bugs.swift.org/browse/SR-6740
> <https://bugs.swift.org/browse/SR-6740>
>
> -Kenny
>
>
>> On Jan 11, 2018, at 3:12 PM, Jordan Rose <[email protected]
>> <mailto:[email protected]>> wrote:
>>
>> I'm not sure whether it was supposed to be supported or not, but either way
>> it's a reasonable feature request. Please file at bugs.swift.org
>> <http://bugs.swift.org/>.
>>
>> Jordan
>>
>>
>>> On Jan 11, 2018, at 14:41, Kenny Leung via swift-users
>>> <[email protected] <mailto:[email protected]>> wrote:
>>>
>>> Hi All.
>>>
>>> I’d like to be lazy and leave out the classname on a key path whenever
>>> possible. I thought that if PartialKeyPath was specified as the argument
>>> type, that meant the compiler should be able to figure out what the class
>>> is, but this does not seem to be the case.
>>>
>>> Here’s an example that works.
>>>
>>> class ThePath {
>>> var isWinding:Bool?
>>> }
>>>
>>> func walk<T>(aPath:T, forKey:PartialKeyPath<T>) {
>>> }
>>>
>>> func walkThePath(aPath:ThePath, forKey:PartialKeyPath<ThePath>) {
>>> }
>>>
>>> func test() {
>>> let path = ThePath()
>>> walkThePath(aPath:path, forKey:\ThePath.isWinding)
>>> walk(aPath:path, forKey:\ThePath.isWinding)
>>> }
>>>
>>> If you do this then it complains:
>>>
>>> func test() {
>>> let path = ThePath()
>>> walkThePath(aPath:path, forKey:\.isWinding) // Expression type '()' is
>>> ambiguous without more context
>>> walk(aPath:path, forKey:\.isWinding) // Type of expression is
>>> ambiguous without more context
>>> }
>>>
>>> Should I be able to do this?
>>>
>>> Thanks!
>>>
>>> -Kenny
>>>
>>> _______________________________________________
>>> swift-users mailing list
>>> [email protected] <mailto:[email protected]>
>>> https://lists.swift.org/mailman/listinfo/swift-users
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>>
>
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