协程的用例是什么？ [英] What are use-cases for a coroutine?

问题描述

协程的概念听起来很有趣，但我不知道是否可以在实际的生产环境中有意义吗？协程的用例是什么，可以像其他方法一样更优雅，更简单或更有效地解决？

The concept of a coroutine sounds very interesting, but I don't know, if it makes sense in a real productive environment? What are use-cases for coroutines, that can be solved more elegant, simpler or more efficient as with other methods?

推荐答案

True协程需要您工具的支持-它们需要由编译器实现并由基础框架提供支持。

True coroutines require support from your tooling - they need to be implemented by the compiler and supported by the underlying framework.

一个协程实例的真实示例是收益回报 C＃2.0中提供的关键字，它使您可以编写一个返回多个值以进行循环的方法。

One real world example of Coroutines is found with the "yield return" keyword provided in C# 2.0, which allows you to write a method that returns multiple values for looping.

但是，收益回报确实有局限性-该实现使用助手类来捕获状态，并且仅支持特定情况下的协程作为生成器（迭代器）

The "yield return" does have limitations, however - the implementation uses a helper class to capture state, and it only supports a specific case of coroutine as generator (iterator).

在更一般的情况下，协程的优点是它们使某些基于状态的计算更易于表达和易于理解-实现状态机因为一组协程比更常见的方法更优雅。但是，这样做需要C＃或Java中尚不存在的支持和工具。

In the more general case, the advantage of Coroutines is that they make certain state based computations much easier to express and easier to understand - implementing a state machine as a set of coroutines can be more elegant than more common approaches. But, doing this requires support and tooling that doesn't yet exist in C# or Java.

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