You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: simple_map.rs
    path of file: ./repos/rustrogueliketutorial/chapter-50-stats/src/map_builders
    
    the code of the file until where you have to start completion: use super::{InitialMapBuilder, BuilderMap, Rect };
use rltk::RandomNumberGenerator;

pub struct SimpleMapBuilder {}

impl InitialMapBuilder for SimpleMapBuilder {
    #[allow(dead_code)]
    fn build_map(&mut self, rng: &mut rltk::RandomNumberGenerator, build_data : &mut BuilderMap) {
        self.build_rooms(rng, build_data);
    }
}

impl SimpleMapBuilder {
    #[allow(dead_code)]
    pub fn new() -> Box<SimpleMapBuilder> {
        Box::new(SimpleMap
    
    fn build_rooms(&mut self, rng : &mut RandomNumberGenerator, build_data : &mut BuilderMap) {
        const MAX_ROOMS : i32 = 30;
        const MIN_SIZE : i32 = 6;
        const MAX_SIZE : i32 = 10;
        let mut rooms : Vec<Rect> = Vec::new();

        for _ in 0..MAX_ROOMS {
            let w = rng.range(MIN_SIZE, MAX_SIZE);
            let h = rng.range(MIN_SIZE, MAX_SIZE);
            let x = rng.roll_dice(1, build_data.map.width - w - 1) - 1;
            let y = rng.roll_dice(1, build_data.map.height - h - 1) - 1;
            let new_room = Rect::new(x, y, w, h);
            let mut ok = true;
            for other_room in rooms.iter() {
                if new_room.intersect(other_room) { ok = false }
            }
            if ok {
                rooms.push(new_room);
            }
        }
        build_data.rooms = Some(rooms);
    }