不能'撰写'和方法和功能

Question

我定义了一个方法和一个函数:

def print(str:String) = println
val intToString = (n:Int) => n.toString

现在我要撰写它们.

我的问题是,为什么两个:

print(_) compose intToString
print(_:String) compose intToString

编译？

但:

(print(_)) compose intToString
(print _ ) compose intToString

编译？

Answer 1

我认为

print(_) compose intToString

des to to to

x => (print(x) compose intToString)

而

(print(_)) compose intToString

des to to to

(x => print(x)) compose intToString