Cursor this in C ++

Each object in C ++ has access to its own location through an important pointer called this pointer. The pointer this in C ++ is a hidden parameter to all member functions. So inside a member function, this pointer can refer to the calling object.

The friend functions do not have this pointer, because friend is not a member of a class. Only member functions in C ++ have this this pointer.

Consider the following example to understand the concept of this pointer in C ++:

 #include using namespace  std ; class Box { public : // phan dinh nghia Constructor Box ( double  dai = 1.0 , double  rong = 1.0 , double  cao = 1.0 ) {  cout  << "Constructor duoc goi!" <<  endl ;  chieudai  =  dai ;  chieurong  =  rong ;  chieucao  =  cao ; } double  theTich () { return  chieudai  *  chieurong  *  chieucao ; } int  sosanh ( Box  box ) { return this -> theTich () >  box . theTich (); } private : double  chieudai ; // chieu dai cua mot box double  chieurong ; // chieu rong cua mot box double  chieucao ; // chieu cao cua mot box }; int  main ( void ) { Box Box1 ( 2.4 , 4.2 , 2.2 ); // khai bao box1 Box Box2 ( 4.5 , 2.0 , 3.2 ); // khai bao box2 if ( Box1 . sosanh ( Box2 )) {  cout  << "Box2 la nho hon Box1" << endl ; } else {  cout  << "Box2 la bang hoac lon hon Box1" << endl ; } return 0 ; } 

Compiling and running the above C ++ program will produce the following results:

According to Tutorialspoint

Previous article: Inline function in C ++

Next lesson: Cursor to class in C ++