【C++ 策略设计模式 】

#include <iostream>
using namespace std;
class IStrategy {
public:
  IStrategy() {}
  virtual ~IStrategy() {}
  virtual void Discountsfun() = 0;
};
class qxj : public IStrategy {
public:
  qxj() {}
  ~qxj() {}
  void Discountsfun() {
    cout << "run qxj 20'%' off" << endl;
  }
};
class gqj : public IStrategy {
public:
  gqj() {}
  ~gqj() {}
  void Discountsfun() {
    cout << "run gqj 10'%' off " << endl;
  }
};
class Context {
public:
  Context(IStrategy *IStrategy) { pIStrategy = IStrategy; }
  ~Context() { delete pIStrategy; }
  void run() {
    pIStrategy->Discountsfun();
  }
private:
  IStrategy *pIStrategy;
};
 // g++ StartegyMode.cpp -o StartegyMode
int main(int argc, char*argv[])
{
  Context context1(new qxj());
  context1.run();
  Context context2(new gqj());
  context2.run();
  return 0;
}