... 不等式约束 inequality constraint 不等式运算子 inequality operator 不等，互斥 inequivalence ...
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A type implements the equality or inequality operator and does not implement the opposite operator.
某类型实现相等运算符或不等运算符，却未实现相反运算符。
Types typically implement the inequality operator by returning the negated value of the equality operator.
类型通常通过返回相等运算符的反值来实现不等运算符。
If your programming language supports operator overloading, you should also provide an implementation of the equality and inequality operators.
如果编程语言支持运算符重载，则还应提供等号和不等号运算符的实现。
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