State any four rules for operator overloading.

State any four rules for operator overloading.
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Rules for operator overloading: 1. Only existing operators can be overloaded. New operators cannot be created. 2. The overloaded operator must have at least one operand that is of user defined type. 3. We cannot change the basic meaning of an operator i.e. we cannot redefine the plus(+) operator to subtract one value from the other. 4. Overloaded operators follow the syntax rules of the original operators. They cannot be overridden. 5. There are some operators that cannot be overloaded. for e.g. sizeof, . , .* , : : , ?: 6. We cannot use friend functions to overload certain operators (=,( ),[ ],->).However member functions can be used to overload them. 7. Unary operators overloaded by means of a member function take no explicit arguments and return no explicit values, but those overloaded by means of a friend function, take one reference argument. 8. Binary operators overloaded through a member function take one explicit argument and those which are overloaded through a friend function take two explicit arguments. 9. When using binary operators overloaded through a member function, the left hand operand must be an object of the relevant class. 10. Binary arithmetic operators such as +,-,* and / must explicitly return a value. They must not attempt to change their own arguments. 
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