This topic is about D Programming – Pointer to classes.
A pointer to a D 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 −
import std.stdio;
class Box {
public:
// Constructor definition
this(double l = 2.0, double b = 2.0, double h = 2.0) {
writeln("Constructor called.");
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
}
void main() {
Box Box1 = new Box(3.3, 1.2, 1.5); // Declare box1
Box Box2 = new Box(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
writeln("Volume of Box1: ",ptrBox.Volume());
// Save the address of first object
ptrBox = &Box2;
// Now try to access a member using member access operator
writeln("Volume of Box2: ", ptrBox.Volume());
}
When the above code is compiled and executed, it produces the following result −
Constructor called. Constructor called. Volume of Box1: 5.94 Volume of Box2: 102
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