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
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