[swift-corelibs-dev] Asynchronous Operations

[Brent Royal-Gordon]

> On Jan 20, 2017, at 7:55 AM, Ian Partridge via swift-corelibs-dev <swift-corelibs-dev at swift.org> wrote:
> 
> Is there any way that we could support asynchronous operations in swift-corelibs-foundation, in the absence of KVO?

Could we add `willChangeValue(forKey:)` and `didChangeValue(forKey:)` methods just to `Operation` which only handle an `isFinished` key? Presumably they'd just look like:

	public func willChangeValue(forKey key: String) {
		// do nothing
	}
	public func didChangeValue(forKey key: String) {
		if key == "isFinished" && isFinished {
			finish()
		}
	}

I believe that would make existing code just work without needing to do anything special.

-- 
Brent Royal-Gordon
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