Kotlin 协程中的“+”？

Question

这是 Cancellation via explicit job Kotlin 协程的示例代码：

fun main(args: Array<String>) = runBlocking<Unit> {
    val job = Job() // create a job object to manage our lifecycle

    // now launch ten coroutines for a demo, each working for a different time
    val coroutines = List(10) { i ->
        // they are all children of our job object
        launch(coroutineContext + job) { // we use the context of main runBlocking thread, but with our own job object
            delay((i + 1) * 200L) // variable delay 200ms, 400ms, ... etc
            println("Coroutine $i is done")
        }
    }
    println("Launched ${coroutines.size} coroutines")
    delay(500L) // delay for half a second
    println("Cancelling the job!")
    job.cancelAndJoin() // cancel all our coroutines and wait for all of them to complete
}

我对表达式 coroutineContext + job?

中的 + 感到困惑

它在做什么？是不是运算符覆盖？

Answer 1

这是operator overloading的一个例子。下面是方法CoroutineContext::plus:

的文档

open operator fun plus(context: CoroutineContext): CoroutineContext

Returns a context containing elements from this context and elements from other context. The elements from this context with the same key as in the other one are dropped.

它基本上是两个上下文的合并。

Kotlin 协程中的“+”？

"+" in Kotlin Coroutines?

operator-overloading

coroutine

kotlin

kotlinx.coroutines