#include <iostream>

using namespace std;

template<typename Derived>

class SegBase

{

public:

 //流程框架

 void segment()

 {

  for (int i = 0; i < 2; i++)

  {

   deal(); //流程内的某个核心部件函数

  }

 }

 void deal_default()

 {

  cout << "Use SegBase default" << endl;

 }

 void deal()

 {

  static_cast<Derived*> (this)->deal();

 }

};

class Seg : public SegBase<Seg>

{

public:

 void deal()

 { //Seg改写deal函数

  cout << "Use Seg modified " << endl;

 }

};

class Seg2 : public SegBase<Seg2>

{

public:

 typedef SegBase<Seg2> Base;

 void deal()

 { //Seg2复用SegBase的默认deal函数

  Base::deal_default();

 }

};

void run()

{

 //Seg seg;

 //seg.segment();

 Seg2 seg2;

 seg2.segment();

}

int main(int argc, char *argv[])

{

 run();

 int test;

 cin >> test;

 return 0;

}