When overloading an operator to support a user-defined type (object), it is best to adhere to the basic semantics of that built-in operator. For instance, the built-in operator ==, which does not modify any of its operands, should also be overloaded in such a way that it does not modify any of its operands (and should be declared as a const member function, as a matter of fact). On the other hand, operators such as + =, which do modify their left operand, should be overloaded in a way that reflects that, i.e., by changing their objects. Note that in many cases, the implementer
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