> On May 8, 2016, at 10:33 AM, Karl Wagner via swift-evolution
> <[email protected]> wrote:
>
>
>> On 4 May 2016, at 00:46, Aleksandar Petrovic via swift-evolution
>> <[email protected] <mailto:[email protected]>> wrote:
>>
>> Hi swift-evolution,
>>
>> I want to apologize in advance for my clumsy English. It's (obviously) not
>> my first language.
>>
>> Recent discussion about property behaviours reminded me of function
>> decorators in Python. I think decorators can nicely fit in Swift, too.
>>
>> First, a bit of explanation for the uninitiated. Decorator is a function
>> that transform other function - it receives some function and returns a
>> function of the same signature. Lets make some dead simple decorator:
In Objective-C, you can add a category that will entirely replace an existing
method. Could using decorators allow us to add behaviors to methods to extend
their behavior without overwriting those methods? Here is an example of what
I'm thinking.
extension UIView {
decorate func somethingElse(...) {
// performs existing behavior of somethingElse
... adds new behavior ...
}
}
Context: I was asking about whether this kind of "extend rather than replace or
subclass" behavior were possible in Swift, and was told that "decorators" might
be the right technology to implement it.
Thanks in advance for any insight.
-- E
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