The derive macro also allows any combination of tracking now where it only allowed a single kind of tracking in 0.6.

You can read more about tracking evolution in this post.

More convenience functions

Back in early versions all entity and component operations had to go through views. With time I changed my mind on this and I added shortcuts to add entities or components directly from World. 0.7 adds more of these functions like World::iter.

#[derive(Component, Debug, PartialEq, Eq)]
struct U32(u32);
#[derive(Component, Debug, PartialEq, Eq)]
struct USIZE(usize);

let mut world = World::new();

let entity = world.add_entity((USIZE(0), U32(1)));

for (i, j) in &mut world.iter::<(&USIZE, &mut U32)>() {
    // <-- SNIP -->
}

Custom Views

Custom views are easier to create and more powerful than ever.

#[derive(Borrow, BorrowInfo, IntoIter)]
struct TransformView<'v> {
    pos: View<'v, Pos>,
    vel: View<'v, Vel>,
}

fn main() {
    // -- SNIP --

    world.run(|v_transform: TransformView| {
        for transform in v_transform.iter() {
            transform.pos;
            transform.vel;
        }
    });
}

Thanks @eldyer, @BoxyUwU and everyone that opened an issue or PR!