ecs ideas

example.rs

fn main() {
  let world = World::new(); // or builder pattern
  let physics = PhysicsSystem::new(); // this would create the ncollide world inside

  // world takes ownership of systems  
  world.add_system(physics);
  // etc.
  
  world.run();
}

physicsSystem.rs

struct PhysicsSystem {
   ncollide_world: NcollideWorld; // or whatever it's called
}

impl PhysicsSystem {
   fn new() {
     // whatever
  }
}

impl System for PhysicsSystem {
  // whatever the System trait is
}

world.rs

struct World {
  //some stuff
  systems: Vec<Box<System>>,
}

impl World {
//other stuff here ...
  fn add_system<T: System>(self, system: T) { // or we could have the systems be passed in as boxes if this doesn't compile
     self.systems.push(Box::new(system));
  }
}