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 | [CODE] class X { public: X () : myID(id) {} X (const X& right) : myID(++id) {} friend ostream& operator<< (ostream&, const X&); private: static int id; int myID; }; int X::id = 0; ostream& operator<< (ostream& os, const X& x) { return os<<x.myID; } X f (X x1, X& …  |