在Kotlin中:: ::运算符有什么用? [英] What is the use of :: operator in Kotlin?

问题描述

请给我的示例和用法::科特林中的 操作员

推荐答案

一个示例:用于

One example: It's for function references, that can be used alternatively to lambdas in many places:

 //Function expecting a lambda to be passed
fun <T> applyToList(list: List<T>, func: (T) -> Boolean) = list.filter { it -> func(it) }

fun foo(i: Int): Boolean = i > 3
//call applyToList with reference to foo()
applyToList(list, ::foo)

或与lambda相同:

Or the same with lambda:

 applyToList(sub) { it > 3 }

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