The Swift 2.2 manual says:
NOTE
Strictly speaking, you can write a custom class that conforms to
CounterDataSource without implementing either protocol requirement. They are
both optional, after all. Although technically allowed, this wouldn’t make for
a very good data source.
I think it’d be helpful to get a compiler warning when you declare that a class
or struct complies to a protocol (that only has optional methods) but doesn’t
actually implement any of the protocol.
E.G., this show show a warning:
import Cocoa
class kindaUseless: NSObject, NSTableViewDelegate {
}
While this behavior is mathematically consistent, it’s not rational and doesn’t
really fit in with Swift.
Extraneous protocol conformance is messy and I can’t imagine a scenario in
which it’s actually useful.
Thoughts?
-W
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