// Components ( ignore the formatting, this saves space )
public struct Position{ float X, Y };
public struct Velocity{ float Dx, Dy };

// BaseSystem provides several usefull methods for interacting and structuring systems
public class MovementSystem : BaseSystem<World, float>
{
    public MovementSystem(World world) : base(world) {}
    
    // Generates a query and calls that one automatically on BaseSystem.Update
    [Query]
    public void Move([Data] in float time, ref Position pos, ref Velocity vel)
    {
        pos.X += time * vel.X;
        pos.Y += time * vel.Y;
    }
    
    // Generates and filters a query and calls that one automatically on BaseSystem.Update in order
    [Query]
    [All<Player, Mob>, Any<Idle, Moving>, None<Alive>]  // Attributes also accept non generics :) 
    public void ResetVelocity(ref Velocity vel)
    {
        vel = new Velocity{ X = 0, Y = 0 };
    }
}

public class Game 
{
    public static void Main(string[] args) 
    {     
        var deltaTime = 0.05f; // This is mostly given by engines, frameworks
        
        // Create a world and a group of systems which will be controlled 
        var world = World.Create();
        var _systems = new Group<float>(
            new MovementSystem(world),   // Run in order
            new MyOtherSystem(...),
            ...
        );
      
        _systems.Initialize();                  // Inits all registered systems
        _systems.BeforeUpdate(in deltaTime);    // Calls .BeforeUpdate on all systems ( can be overriden )
        _systems.Update(in deltaTime);          // Calls .Update on all systems ( can be overriden )
        _systems.AfterUpdate(in deltaTime);     // Calls .AfterUpdate on all System ( can be overriden )
        _systems.Dispose();                     // Calls .Dispose on all systems ( can be overriden )
    }
}
```**