What are the rules for operator overloading in C++?

The rules for overloading operators in C++ are as follows:

1. The priority and associativity of existing operators cannot be redefined.
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10. Overloaded operators must have at least one operand that is a user-defined type and cannot change the number of operands for the operator.
11. Operator overloading can be done using either member functions or non-member functions, but if it is a non-member function, at least one operand must be a user-defined type.
12. If overloaded as a member function, the number of operands decreases by one, but if overloaded as a non-member function, the number of operands remains the same.
13. The semantics of operands cannot be altered by operators.
14. When overloading as a non-member function, the number of parameters should be equal to the number of operands for that operator. If it is a member function, the number of parameters should be one less than the number of operands for that operator.
15. Overloading operators cannot change their priority and associativity.
16. Overloaded operators should maintain their original basic meanings and not be excessively overloaded to avoid confusion and unnecessary complexity.