我需要重载的最小运算符集是什么? [英] What is the minimum set of operators I need to overload?

问题描述

比较的哪个运算符(< =，>，==等)通常作为基本运算符来实现，您可以在使用它们之后实现其余的比较运算符或在类之间进行所有可能的比较?

which operators of the comparison (<=, >, ==, etc.) do You usually implement as your basic operators, which You can after use to implement the rest comparison operators or to make all possible comparisons among the classes?

推荐答案

您可以使用以下等效项在==和<方面实现所有六个运算符:

You can implement all six of the operators in terms of == and < using the following equivalencies:

a != b    =>    !(a == b)
a > b     =>    b < a
a >= b    =>    !(a < b)
a <= b    =>    !(b < a)

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