121日目

日記

暇すぎる．

今日書いたコード

struct CallableStruct {
    var value: Int
    func callAsFunction(_ number: Int, scale: Int) {
        print(scale * (number + value))
    }
    func callAsFunction() {
        print("nothing")
    }
}

let callable = CallableStruct(value: 1)
callable(2, scale: 3)
callable()
callable.callAsFunction(2, scale: 3)
callable.callAsFunction()

感想

これ知らなかった．

プロポーザルはこれで，こういうのに便利だよねと書いてある．

• Values that represent functions: mathematical functions, function expressions, etc.
• Values that have one main use and want to provide a simple call-syntax interface: neural network layers, parsers, efficient bound closures, etc.