The le operator in the last element below is an example of a value comparison operator.

下面最后一个元素中的le运算符就是值比较运算符的一个例子。

youdao

std::pair has a comparison operator that does effectively the same comparisons as your version.

pair有一个比较运算符，跟你刚才写的那个一样。

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The goal here is to avoid accidentally using the single-equals assignment operator instead of the double-equals comparison operator

目标在于避免意外地使用单等号赋值运算符而非双等号比较运算符

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