C ++是operator！=定义了operator ==时自动提供 [英] C++ is operator!= automatically provided when operator== defined

问题描述

我想知道是否在我的班级中定义了operator ==时自动提供了operator！=?当我在A类中定义了operator ==时，显然A a，A b，a == b有效，但是！= b则无效.但是我不确定是否总是这样.有什么例外吗?

I wonder if operator!= is automatically provided when operator== is defined within my class? When I have operator== defined in class A, obviously A a, A b, a == b works, but a != b doesn't. However I am not sure if it always happens. Are there any exceptions from this?

推荐答案

为您自动提供的 not 操作符！= .如果您想要这样的自动化，则可能需要阅读 rel_ops 命名空间.基本上你可以说

The operator != is not automatically provided for you. You may want to read about rel_ops namespace if you want such automation. Essentially you can say

using namespace std::rel_ops;

在使用 operator！= 之前.

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