Prototype
2022/7/26 23:23:38
本文主要是介绍Prototype,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
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#include<iostream> using namespace std; // prototype class Img { public: static void FindAndClone() { for (int id = 0; id <= count; ++id) { _Prototypes[id]->clone()->print(); } } // why vrtual virtual Img* clone() const = 0; virtual void print() const = 0; // why not virtual void addPrototype(Img* obj) { Img::_Prototypes[count++] = obj; } private: //declaration //why static static Img * _Prototypes[10]; static int count; }; //defination Img* Img::_Prototypes[10]; int Img::count = 0; class SpotImg : public Img{ public: virtual void print() const { cout << "add class SpotImg" << endl; } protected: virtual Img* clone() const{ return new SpotImg(1); } SpotImg(int dummy) {} private: //why static static SpotImg _SpotImg; SpotImg() { addPrototype(this); } }; SpotImg SpotImg::_SpotImg; class LandSatImg : public Img{ public: virtual void print() const { cout << "add class LandSatImg" << endl; } protected: virtual Img* clone() const{ return new LandSatImg(1); } LandSatImg(int dummy) {} private: static LandSatImg _LandSatImg; LandSatImg() { addPrototype(this); } }; LandSatImg LandSatImg::_LandSatImg; int main() { Img::FindAndClone(); return 0; }
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