AFAIK there isn't currently a way of matching if an Any instance is a closure:
func something<T>(x: T) -> String {
/// is x a function? We want to support Any (Int, Int32, Float, Double,
/// AnyObject, ...), but disallow functions.
...
}
let myClosure = { print("Hello") }
something(myClosure) // Don't allow this.
I propose adding a protocol Function - all closures would conform to it. See
the code on
https://gist.github.com/charlieMonroe/655f2b5e25cc0b4ba06c0ddafa41c73b
<https://gist.github.com/charlieMonroe/655f2b5e25cc0b4ba06c0ddafa41c73b>
which outlines the API and possible usage of it:
- Allowing to match a function from an Any instance.
- Inspect the function object - arguments, captured values, return type. This
may help debugging retain cycles by printing the catputred variables - you will
be able to see `self` within these.
- Invocation - creating something as NSInvocation, since you'd be able to call
the function with a list of arguments.
- This could also become a basis for some RPC in Swift.
I know this is partially something for the Reflection discussion going on here
as well as something for the existentials, but since it kind of overlapses both
discussions, I thought creating a new thread would perhaps be beneficial.
Charlie
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