c++设计模式：策略模式

叁歲伎倆 2021-12-04 06:37 197阅读 0赞

1.主要思想：例如针对不同的算法，创建不同的类。

#include <iostream>
    using namespace std;
     
    // The abstract strategy
    class Strategy
    {
    public:
         virtual void AlgorithmInterface() = 0;
    };
     
    class ConcreteStrategyA : public Strategy
    {
    public:
         void AlgorithmInterface()
         {
              cout<<"I am from ConcreteStrategyA."<<endl;
         }
    };
     
    class ConcreteStrategyB : public Strategy
    {
    public:
         void AlgorithmInterface()
         {
              cout<<"I am from ConcreteStrategyB."<<endl;
         }
    };
     
    class ConcreteStrategyC : public Strategy
    {
    public:
         void AlgorithmInterface()
         {
              cout<<"I am from ConcreteStrategyC."<<endl;
         }
    };
     
    class Context
    {
    public:
         Context(Strategy *pStrategyArg) : pStrategy(pStrategyArg)
         {
         }
         void ContextInterface()
         {
              pStrategy->AlgorithmInterface();
         }
    private:
         Strategy *pStrategy;
    };
     
    int main()
    {
         // Create the Strategy
         Strategy *pStrategyA = new ConcreteStrategyA;
         Strategy *pStrategyB = new ConcreteStrategyB;
         Strategy *pStrategyC = new ConcreteStrategyC;
         Context *pContextA = new Context(pStrategyA);
         Context *pContextB = new Context(pStrategyB);
         Context *pContextC = new Context(pStrategyC);
         pContextA->ContextInterface();
         pContextB->ContextInterface();
         pContextC->ContextInterface();
     
         if (pStrategyA) delete pStrategyA;
         if (pStrategyB) delete pStrategyB;
         if (pStrategyC) delete pStrategyC;
     
         if (pContextA) delete pContextA;
         if (pContextB) delete pContextB;
         if (pContextC) delete pContextC;
    }

转载于:https://www.cnblogs.com/mcy0808/p/10832557.html