Add SHXPromise to implementations

[MSNexploder]

No description provided.

[briancavalier]

I have almost no experience with Objective-C, but the code looks clean, and has tests :)

@MSNexploder: Does it ensure that onFulfilled and onRejected are invoked asynchronously? Does such a mechanism exist in Objective-C?

It looks like in handlePromiseWithValue handles the case of value being a promise (but again, I barely parse Obj-C, so I could be totally off!), and uses the term fulfill in either case. Typically, that polymorphic operation of handling either a promise or a value is called resolve. It's not a problem--especially since we don't have a spec for it--just fyi.

[MSNexploder]

I tried to keep the tests as close to the original Promises/A+ compliance test suite as possible.

All callbacks are invoked using dispatch_async which basically defers the execution to a later time (+ optionally to a different execution queue / thread).

Actually, you're right about fulfill vs resolve. No idea why I didn't keep the original naming...

[briancavalier]

I tried to keep the tests as close to the original Promises/A+ compliance test suite as possible.

Awesome.

All callbacks are invoked using dispatch_async

Ah, I missed that. Thanks!

Looks good to me. @domenic?

[domenic]

Looks great to me!