拷贝构造，构造函数，析构函数的调用顺序

来源：互联网发布：比较两个数组的差异编辑：程序博客网时间：2024/05/16 00:28

#include "iostream"using namespace std;class ABCD {public:ABCD(int a, int b, int c){this->a = a;this->b = b;this->c = c;printf("ABCD() construct, a:%d,b:%d,c:%d  \n", this->a, this->b, this->c);}~ABCD(){printf("~ABCD() construct,a:%d,b:%d,c:%d  \n", this->a, this->b, this->c);}int getA() {return this->a;}protected:private:int a;int b;int c;};class MyE{public:MyE():abcd1(1,2,3),abcd2(4,5,6),m(100){cout<<"MyD()"<<endl;}~MyE(){cout<<"~MyD()"<<endl;}MyE(const MyE & obj):abcd1(7,8,9),abcd2(10,11,12),m(100){printf("MyD(const MyD & obj)\n");}protected://private:public:ABCD abcd1; //c++编译器不知道如何构造abc1ABCD abcd2;const int m;};int doThing(MyE mye1){printf("doThing() mye1.abc1.a:%d \n", mye1.abcd1.getA()); return 0;}int run2(){MyE myE;doThing(myE);   //类的实参去做形参，会调用拷贝构造函数return 0;}//int run3(){printf("run3 start..\n");//ABCD abcd = ABCD(100, 200, 300);//若直接调用构造函数哪//想调用构造函数对abc对象进行再复制，可以吗？//在构造函数里面调用另外一个构造函数，会有什么结果？ABCD(400, 500, 600); //临时对象的生命周期printf("run3 end\n");return 0;}int main(){run2();//run3();system("pause");return 0;}

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