operator() shall be a non-static member function with an arbitrary number of parameters. It can have default arguments. It implements the function call syntax
postfix-expression ( expression-listopt )
where the postfix-expression evaluates to a class object and the possibly empty expression-list matches the parameter list of an operator() member function of the class. Thus, a call x(arg1,...) is interpreted as x.operator()(arg1, ...) for a class object x of type T if T::operator()(T1, T2, T3) exists and if the operator is selected as the best match function by the overload resolution mechanism ([over.match.best]).
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