设计模式-原型模式

原型模式

要点：clone一个对象 拷贝构造函数必须重写

#define _CRT_SECURE_NO_WARNINGS//这里编译没通过，所以去属性里面改吧 先换成strcpy_s用
#include <iostream>

using namespace std;

class Student
{
public:
	Student(){}
	Student(const Student&) {};
	~Student() {
		printf("Destruct Student\n");
	}
	virtual void getStudentInfo() = 0;
	virtual Student *clone() = 0;
protected:
	char name[20];
	int id;
};
class StudentType : public Student
{
public:
	StudentType(const char* input_name){//this "const" must be exist, or it would be compile error
		strcpy_s(name, input_name);//无法从“const char [9]”转换为“char *”
		this->id = 0;
		printf("StudentType Construct\n");
	}
	StudentType() {}
	StudentType(const StudentType& stuType) {
		printf("copy Construct StudentType\n");
		this->id = stuType.id;
		this->id++;
		strcpy_s(name, stuType.name);
	}
	StudentType* clone() override {
		return new StudentType(*this);
	}
	virtual void getStudentInfo() override {
		printf("student name is %s, id is %d\n", name, id);
	}
	~StudentType() {
		printf("Destruct StudentType\n");
	}
};

int main(){
        const char* str = "xiaoming";
	Student *stu = new StudentType(str);
	Student *stu1 = stu->clone();
	Student *stu2 = stu1->clone();

	stu->getStudentInfo();
	stu1->getStudentInfo();
	stu2->getStudentInfo();
	delete stu2;
	delete stu1;
	delete stu;
	cout << "hello" << endl;
      return 0;
}

结果

StudentType Construct
copy Construct StudentType
copy Construct StudentType
student name is xiaoming, id is 0
student name is xiaoming, id is 1
student name is xiaoming, id is 2
Destruct Student
Destruct Student
Destruct Student
hello