具有多个参数的scala隐式方法 [英] scala implicit method with multiple arguments

问题描述

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In a comment for SIP-13 Martin Odersky implied that it is possible to create an implicit method with multiple arguments. According to my experiences, implicit methods always have exactly one argument and I cannot imagine how an implicit method with multiple arguments can be used. Can someone give some use case and explanation?

推荐答案

例如，如果您需要函数类型的隐式参数:

For example if you need an implicit parameter of a function type:

implicit def foo(x: Int, y: Int) = y * x

def bar(x: Int, y: Int)(implicit f: (Int, Int) => Int) = f(x,y)

scala> bar(3,4)
res3: Int = 12

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