Why does index/index_mut require Pixel to implement Copy

[mdcrapse]

The following code does not compile because String does not implement Copy:

fn main() {
    let vec = imgref::ImgVec::new(vec!["world!`".to_string()], 1, 1);
    println!("Hello, {}", vec[(0usize, 0usize)]);
}

If you look at imgref/ops.rs it requires Pixel to implement Copy. Why is Copy required?

[kornelski]

This library is written with images in mind, and I haven't seen an actual pixel definition that isn't copyable. I hope this catches mistakes.

[mdcrapse]

My bad, I was treating ImgVec like a 2d vector. Thanks for the clarification.