Zero_ECS - I created an ECS

Hello,

I've created an ECS, and since there are already 10+ high quality ECS crates in rust I feel I have to defend my ECS's existance :)

A few months ago I discovered rust, and I wanted to write a game to learn rust. (I used to be game developer).

I thought about how to structure the gameplay code and landed in the decision that using an ECS was the correct path.

I checked out some of the existing ECS crates and I didn't find one that was the way I wanted:

Only use zero cost abstractions. That means no using dyn, Box, anymaps etc.
Only use safe rust code. No unsafe code.
Be fast, no point in using an ECS otherwise :)
Be very user friendly, I need to be able to prototype quickly.

So I created Zero\_ECS and been working on it for a couple of weeks, it is not really done, I discover issues as I'm developing but it is in a state that I would like to show it to someone that isn't me.

So if anyone is interested here it is: Zero\_ECS Github

Define components and entities with simple Rust structs, and systems as simple rust functions:

#[component]
struct Position(f32, f32);

#[component]
struct Velocity(f32, f32);

#[entity]
struct Enemy {
    position: Position,
    velocity: Velocity,
}

#[system]
fn apply_velocity(world: &mut World, query: Query<(&mut Position, &Velocity)>) {
    world
        .with_query_mut(query)
        .iter_mut()
        .for_each(|(position, velocity)| {
            position.0 += velocity.0;
            position.1 += velocity.1;
        });
}

fn main() {
    let mut world = World::default();

    for _ in 0..10 {
        world.create(Enemy {
            position: Position(0.0, 0.0),
            velocity: Velocity(1.0, 1.0),
        });
    }

    systems_main(&mut world);
}

I've tried to write detailed clear instructions here: README

Any thoughts and/or feedback is welcome :)