C++不要虚函数代替虚函数

#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;
}