A prefix unary operator shall be implemented by a non-static member function ([class.mfct]) with no parameters or a non-member function with one parameter. Thus, for any prefix unary operator @, @x can be interpreted as either x.operator@() or operator@(x). If both forms of the operator function have been declared, the rules in [over.match.oper] determine which, if any, interpretation is used. See [over.inc] for an explanation of the postfix unary operators ++ and --.
The unary and binary forms of the same operator are considered to have the same name. [ Note: Consequently, a unary operator can hide a binary operator from an enclosing scope, and vice versa. — end note ]
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