等值和平等之间有什么区别？ [英] What is the difference between equivalence and equality?

问题描述

C ++中的相等和相等之间有什么区别？

What is the difference between equivalence and equality in C++?

有一个非常相似的问题。但是，此问题带有数学的问题，而我我对C ++上下文中的含义感兴趣。

There is a very similar question here. However, this question is tagged with math, while I am interested in the meaning in C++ context.

要查看上下文中的术语：Scott Meyers在此视频。

To see the terms in context: Scott Meyers uses them in an example in this video.

推荐答案

在< a href = http://en.cppreference.com/w/cpp/language/operator_comparison rel = noreferrer> cppreference.com 我找到了以下引文：

对于同时具有EqualityComparable和LessThanComparable的类型，C ++标准库在相等性（即表达式a == b的值）和对等性（即！（a< b）&&的值（b< a）。

For the types that are both EqualityComparable and LessThanComparable, the C++ standard library makes a distinction between equality, which is the value of the expression a == b and equivalence, which is the value of the expression !(a < b) && !(b < a).

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