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Advanced Programming Techniques in D

Use of Properties

Explore how to use properties in D programming to encapsulate member variables, ensuring controlled access and modification. Understand why properties improve code maintenance by restricting direct variable access and fostering better design in object-oriented structures.

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Properties are not absolutely necessary

We saw in the previous lesson how Rectangle can be used as if it has a third member variable. However, regular member functions could also be used instead of properties:

D
import std.stdio;

import std.math;



struct Rectangle {

    double width;

    double height;



    double area() const {

        return width * height;

    }



    void setArea(double newArea) {

        auto scale = sqrt(newArea / area);



        width *= scale;

        height *= scale;

    }

}



void main() {

    auto garden = Rectangle(10, 20);

    writeln("The area of the garden: ", garden.area());



    garden.setArea(50);



    writefln("New state: %s x %s = %s",

             garden.width, garden.height, garden.area());

}

Further, as we already know, these two functions could even have ...