1 #include <iostream>
 2 #include <string>
 3 #include <set>
 4 #include <algorithm>
 5 using namespace std;
 6
 7 class Person{
 8     public:
 9         string firstname() const;
10         string lastname() const;
11         ...
12 };
13
14 class PersonSortCriterion{
15     public:
16         bool operator()(const Person&p1,const Person& p2) const {
17             return p1.lastname()<p2.lastname()||
18                     (!(p2.lastname()<p1.lastname())&&
19                     p1.firstname()<p2.firstname());
20         }
21 };
22
23 int main()
24 {
25     typedef set<Person,PersonSortCriterion> PersonSet;
26     PersonSet coll;
27     PersonSet::iterator pos;
28     for(pos=coll.begin();pos!=coll.end();++pos){
29         ...
30     }
31     ...
32 }

 1 #include <iostream>
 2 #include <list>
 3 #include <algorithm>
 4 #include "print.cpp"
 5 using namespace std;
 6
 7 class IntSequence
 8 {
 9 private:
10     int value;
11 public:
12     IntSequence(int initialValue):value(initialValue){}
13     int operator() ()
14     {
15         return value++;
16     }
17 };
18
19 int main()
20 {
21     list<int> coll;
22     generate_n(back_inserter(coll),9,IntSequence(1));
23     PRINT_ELEMENTS(coll);
24     generate(++coll.begin(),--coll.end(),IntSequence(42));
25     PRINT_ELEMENTS(coll);
26 }

 1 #include <iostream>
 2 #include <vector>
 3 #include <algorithm>
 4 using namespace std;
 5
 6 class MeanValue
 7 {
 8 private:
 9     long num;
10     long sum;
11 public:
12     MeanValue():num(0),sum(0){}
13     void operator() (int elem)
14     {
15         num++;
16         sum+=elem;
17     }
18     double value()
19     {
20         return static_cast<double>(sum)/static_cast<double>(num);
21     }
22 };
23
24 int main()
25 {
26     vector<int> coll;
27     for(int i=1;i<=8;++i)
28     {
29         coll.push_back(i);
30     }
31     MeanValue mv=for_each(coll.begin(),coll.end(),MeanValue());
32     cout<<"mean value:"<<mv.value()<<endl;
33 }