为什么流运算符在C ++中返回引用？ [英] Why do stream operators return references in C++?

问题描述

我知道索引操作符实现通常返回引用，以便可以设置和检索值，但为什么是流？

I know that indexing operator implementations usually return references so that the values can be set as well as retrieved, but why do streams?

推荐答案

因此，您可以将它们链接在一起。

So you can chain them together.

cout << "hello" << "how are you";

工作原因是 cout< hello返回对cout的引用，以便<

Works because cout << "hello" returns a reference to the cout so that << "how are you" knows there to put itself.

大多数操作符，例如 + = ，也可以这样做。

Most operators, such as +=, also do this.

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