extern crate specs;

#[macro_use]
extern crate specs_derive;

use specs::prelude::*;
use specs::{Component, VecStorage};

#[derive(Debug, Component)]
#[storage(VecStorage)]
pub struct Position
{
    pub x: f32
}

pub struct DrawRequest<'a>
{
    pub position: &'a Position
}

pub struct FetchDrawRequests;

impl<'a> System<'a> for FetchDrawRequests
{
    type SystemData = (Write<'a, Vec<DrawRequest<'a>>>,
                       ReadStorage<'a, Position>);

    fn run(&mut self, data: Self::SystemData)
    {
        let (requests, positions) = data;

        requests.clear();

        for pos in &positions
        {
            let request = DrawRequest {position: &pos};
            requests.push(request);
        }
    }
}

fn main()
{

}