#[derive(Debug)]
struct Pixel{
    r:u8,
    g:u8,
    b:u8,
}

impl IntoIterator for Pixel{
    type Item = u8;
    type IntoIter = PixelIntoIterator;

    fn into_iter(self) -> Self::IntoIter{
        PixelIntoIterator{
            pixel:self,
            index:0,
        }
    }

}


struct PixelIntoIterator{
    pixel:Pixel,
    index:u8,
}


impl Iterator for PixelIntoIterator{
    type Item = u8;

    fn next(&mut self) -> Option<u8>{


        let result = match self.index{
            0 => { self.pixel.r},
            1 => { self.pixel.g},
            2 => { self.pixel.b},
            _ => { return None},
        };

      self.index +=1;
        Some(result)
    }


}

fn main(){
    let p = Pixel{
                r:45,
                g:34,
                b:33 };

    let p1 = Pixel{
                r:4,
                g:3,
                b:39 };

    let mut v = vec!();

        v.push(p);
        v.push(p1);

        //for loop on pixel
        println!("This is for loop on Pixel struct");


        for j in v{

            for i in j{
                println!("{}",i);
            }
        }
}