+1, I also think we need a special protocol for function/closure.
On 31.05.2016 13:12, Charlie Monroe via swift-evolution wrote:
AFAIK there isn't currently a way of matching if an Any instance is a closure:
funcsomething<T>(x: T) -> String{
/// is x a function? We want to support Any (Int, Int32, Float, Double,
/// AnyObject, ...), but disallow functions.
...
}
letmyClosure = { 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
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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