// (C) Porkolab 2003 // // A.6.22. // // Nonmodifying Sequence Algorithms: for_each template<class In, class Op> Op for_each(In first, In last, Op f) { while (first != last) f(*first++); return f; } /* * Usage of for_each * */ void extract(const list<Club>& lc, list<Person*>& off) // place the officers from `lc' on `off' { for_each(lc.begin(),lc.end(),Extract_officers(off)); } class Extract_officers { list<Person*>& lst; public: explicit Extract_officers(list<Person*>& x) : lst(x) { } void operator()(const Club& c) { copy(c.officers.begin(),c.officers.end(),back_inserter(lst)); } };