This topic is about D Programming – this pointer.
Every object in D has access to its own address through an important pointer called this pointer. The this pointer is an implicit parameter to all member functions. Therefore, inside a member function, this may be used to refer to the invoking object.
Let us try the following example to understand the concept of this pointer −
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;
}
int compare(Box box) {
return this.Volume() > box.Volume();
}
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
if(Box1.compare(Box2)) {
writeln("Box2 is smaller than Box1");
} else {
writeln("Box2 is equal to or larger than Box1");
}
}
When the above code is compiled and executed, it produces the following result −
Constructor called. Constructor called. Box2 is equal to or larger than Box1
In this topic learn about D Programming – this pointer. To know more, Click Here.
Pingback: D Programming - Classes & Objects - Adglob Infosystem Pvt Ltd