Why when the destructor of the parent class is defined as virtual, delete pTest2 releases the resources of Derived, otherwise it can only release the resources of Base, and delete pTest1 can release the resources of Derived and Base class Base { public...
-sharpinclude <iostream> using namespace std; class a { public: void virtual x() { cout << "x" << endl; } void xx() { cout << "x1" << endl; } }; class b :public a { public:...
-sharpinclude <stdio.h> -sharpinclude <malloc.h> -sharpinclude <string.h> typedef struct _Info1 { int value; char name[64]; }Info1,*pInfo1; typedef struct _Info2 { int value; char *name; }Info2,*pInfo2; typedef struct...
I am a novice. Before, I used react technology stack to develop projects in the company, but I was only responsible for local development, using a local server, and then git push the code. After that, the supervisor was doing all the work. Now that I hav...
Error in callback for watcher "center ": "TypeError: Cannot read property centerAndZoom of undefined " Cannot read property centerAndZoom of undefined Why do you keep reporting undefined <div id="map"> <bai...
configuration file [mailreceivers] who= [ XXX@XXX ] msg_to=config.get ( mailreceivers , who ) is used in the program. The message failed to be sent after running. The exception error is message delivery failure (503, bounded error: need RCPT...
it s not easy to make better use of the components, resulting in a lot of problems! <!-- --> <el-button icon="el-icon-plus" circle :size="iconSize" ...