this post was submitted on 18 Mar 2024
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Fellow C and Rust programmers, how do you live without classes? (lemmy.blahaj.zone)
submitted 7 months ago by Smorty@lemmy.blahaj.zone to c/transprogrammer@lemmy.blahaj.zone
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I lived in a perfect OOP bubble for my entire life. Everything was peaceful and it worked perfectly. When I wanted to move that player, I do player.move(10.0, 0.0); When I want to collect a coin, I go GameMan -> collect_coin(); And when I really need a global method, so be it. I love my C++, I love my python and yes, I also love my GDScript (Godot Game Engine). They all work with classes and objects and it all works perfectly for me.

But oh no! I wanted to learn Rust recently and I really liked how values are non-mutable by defualt and such, but it doesn't have classes!? What's going on? How do you even move a player? Do you just HAVE to have a global method for everything? like move_player(); rotate_player(); player_collect_coin(); But no! Even worse! How do you even know which player is meant? Do you just HAVE to pass the player (which is a struct probably) like this? move(player); rotate(player); collect_coin(player, coin); I do not want to live in a world where everything has to be global! I want my data to be organized and to be able to call my methods WHERE I need them, not where they just lie there, waiting to be used in the global scope.

So please, dear C, Rust and... other non OOP language users! Tell me, what makes you stay with these languages? And what is that coding style even called? Is that the "pure functional style" I heard about some time?

Also what text editor do you use (non judgemental)? Vim user here

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[–] Turun@feddit.de 0 points 7 months ago* (last edited 7 months ago)

The only thing that makes rust different from cpp is the lack of inheritance. We have classes, they are called structs. And Interfaces, they are called traits.

But instead of inheritance if you want shared behavior between two structs you need to have both of them implement the same trait. So instead of

fn pet(aimal: Animal)

You'd have

fn pet(animal: impl Petable)   // polymorphism via monomorphization

Or

fn pet(animal: &dyn Petable)  //polymorphism via dynamic dispatch

Instead of writing an animal super class you define a Petable trait:

trait Petable{
    fn pet(){}
}

We even have operator overload, because you can simply implement the f32::Add (or whatever) trait for your structs.

[–] zea_64@lemmy.blahaj.zone 0 points 7 months ago (1 children) 
impl Player {
    fn move(&mut self, x: f64, y: f64) { ... }
}

player.move(10.0, 0.0);
[–] Smorty@lemmy.blahaj.zone 0 points 7 months ago (1 children)

Where would we define the player position?

[–] zaphod@feddit.de 0 points 7 months ago

You'd use a struct like

struct Player {
    x: f64,
    y: f64,
}
[–] 30p87@feddit.de 0 points 7 months ago

I only use C when I very likely don't need classes, and if I then still need to, I can fake them more or less well with structs, functions and pointers to functions in structs.