Pointer to C++ Classes Declare initialize access
A pointer to a C++ class is done exactly the same way as a pointer to a structure
and to access members of a pointer to a class you use the member access operator -> operator,
just as you do with pointers to structures. Also as with all pointers, you must initialize the pointer before using it.
Let us try the following example to understand the concept of pointer to a class −
#include <iostream>
using namespace std;
class Box {
public:
// Constructor definition
Box(double l = 2.0, double b = 2.0, double h = 2.0) {
cout <<"Constructor called." << endl;
length = l;
breadth = b;
height = h;
}
double Volume() {
return length * breadth * height;
}
private:
double length; // Length of a box
double breadth; // Breadth of a box
double height; // Height of a box
};
int main(void) {
Box Box1(3.3, 1.2, 1.5); // Declare box1
Box Box2(8.5, 6.0, 2.0); // Declare box2
Box *ptrBox; // Declare pointer to a class.
// Save the address of first object
ptrBox = &Box1;
// Now try to access a member using member access operator
cout << "Volume of Box1: " << ptrBox->Volume() << endl;
// Save the address of second object
ptrBox = &Box2;
// Now try to access a member using member access operator
cout << "Volume of Box2: " << ptrBox->Volume() << endl;
return 0;
}
https://www.tutorialspoint.com/cplusplus/cpp_pointer_to_class.htm