例一 原网址:https://lcxing.blog.csdn.net/article/details/79521841 参考网址：https://blog.csdn.net/lin_duo/article/details/84888766
#include <iostream> using namespace std; class Sheep { friend ostream& operator<<(ostream&, Sheep& sheep); public: Sheep(char* name, int age) { age_ = age; name_ = new char[strlen(name)+1]; strcpy(name_, name); } Sheep(const Sheep& sheep) { age_ = sheep.age_; name_ = new char[strlen(sheep.name_)+1]; strcpy(name_, sheep.name_); } ~Sheep() { if (name_ != NULL) { delete name_; } } Sheep& operator=(const Sheep& sheep) { if (this == &sheep) { return *this; } if (name_ != NULL) { delete name_; name_ = NULL; } age_ = sheep.age_; name_ = new char[strlen(sheep.name_)+1]; strcpy(name_, sheep.name_); } Sheep* Clone() { return new Sheep(*this); } char* GetName() { return name_; } void SetName(char* name) { if (name_ != NULL) { delete name_; name_ = NULL; } } int GetAge() { return age_; } void SetAge(int age) { age_ = age; } private: char *name_; int age_; }; ostream& operator<<(ostream&, Sheep& sheep) { cout << "[name = " << sheep.name_<< ", age = " << sheep.age_ << "]"; return cout; } int main() { Sheep* sheep1 = new Sheep("douli", 0); Sheep* sheep2 = sheep1->Clone(); cout<<"sheep1:"<<*sheep1<<endl; cout << "sheep2:" << *sheep2 << endl; cout << "shanchu clone yuanxin sheep1" << endl; delete sheep1; cout << "sheep2:" << *sheep2 << endl; return 0; } 运行结果： sheep1:[name = douli, age = 0] sheep2:[name = douli, age = 0] shanchu clone yuanxin sheep1 sheep2:[name = douli, age = 0]留意： ostream& operator<<(ostream&, Sheep& sheep)
例二： 原网址：https://blog.csdn.net/CoderAldrich/article/details/83115203
#include <iostream> using namespace std; //接口 class Prototype { public: Prototype() {} virtual ~Prototype() {} virtual Prototype * Clone() = 0; }; //实现 class ConcretePrototype : public Prototype { public: ConcretePrototype():counter_(0) {} virtual ~ConcretePrototype() {} //拷贝构造函数 ConcretePrototype(const ConcretePrototype& rhs) { counter_ = rhs.counter_; } //复制自身 virtual ConcretePrototype * Clone(){ //调用拷贝构造函数 return new ConcretePrototype (*this ); } int counter_; }; int main(){ //生成对像 ConcretePrototype * conProA = new ConcretePrototype (); //复制自身 ConcretePrototype * conProB = conProA->Clone(); cout << conProB->counter_ << endl; conProB->counter_ = 1; cout << conProB->counter_ << endl; delete conProA; conProA = NULL ; delete conProB; conProB = NULL ; return 0; }运行结果： 0 1
