Polymorphism

While programming in C, we get close to the system. 
In this course, we'll use C to examine how building-blocks are built and gain a deeper understanding of polymorphism. Let's explore its internals.

Polymorphism

It means 'occurring in different forms'. It is an indispensable aspect of modern software production. For example, doctors want different forms of imaging for different parts of the body; developers want different forms of environments for testing and production -  Code often needs to run in different contexts. And these contexts keep growing over time.

 There are many ways to realize these 'different forms'. Let's look at a trivial way, which doesn't use polymorphism.

 Suppose we had a row of different heavy artillery machines. They look alike, but are made by different companies. Each company has provided its own function to fire the projectile. For example, the Howitzer equipment has a function called 'howitzer_v1_fire', while Dhanush provides a function called 'dhanush_fire' and so on. These functions accept an equipment-identifier to distinguish the one to be fired.

 Our job is to program them to fire in quick succession.
U.S. Army photo by Pfc. Dasol Choi, 1st Armored Brigade Combat Team Public Affairs, 1st Cav. Div.

To do this, I wrote the following function:
void synchronized_fire() {
  howitzer_v1_fire(GUN_ID1);
  dhanush_fire(GUN_ID2);
  bofors_v2_fire(GUN_ID3);
  howitzer_v2_fire(GUN_ID4);
  dhanush_fire(GUN_ID5);
}

What's wrong in writing the function this way?

Feel free to comment below. The topic is continued here

Comments

  1. RaPa Learning23 March 2019 at 02:40

    Is there really a problem? The function works, right?

    ReplyDelete
    Replies
    1. RaPa Learning29 March 2019 at 03:39

      Yes, but think about deployment. Every new sequence of guns will require a new program. So if there are deployments along the border and each has a different set of guns, each of them will require a different version of this program. Very soon, the number of versions will become huge.
      Adding a gun from a new manufacturer will require a re-release of all these versions, increasing the effort and cost involved in maintenance.

      Delete
    2. Unknown25 April 2019 at 03:28

      "Let's look at a trivial way, which doesn't use polymorphism" - what do you mean by these lines? Can you explain these lines?

      Delete
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