[swift-evolution] [Proposal draft] Conditional conformances

Anton Zhilin antonyzhilin at gmail.com
Wed Sep 28 04:55:48 CDT 2016

I find the limitation of non-intersection of conditional conformance
reqirements quite limiting. Can it be lifted in case there are no
overloaded functions between extensions?

protocol A { func foo() }
protocol B { func bar() }

extension Array: A where Element: A {
    func foo() { return self.first!.foo() }
extension Array: B where Element: B {
    func bar() { return self.first!.bar() }

let arr: Array<T>

What is ambiguous here? When we see arr.foo(), we know it's from Array: A
extension, regardless of T, and we just have to check the requirement of
that extension.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.swift.org/pipermail/swift-evolution/attachments/20160928/584d3aee/attachment.html>

More information about the swift-evolution mailing list