unsafe code guidelines for hw1? about cs431 HOT 4 CLOSED

ART is a pointer-based data structure, and in my opinion, you cannot avoid unsafe blocks altogether. I'd recommend you avoid unsafe blocks as much as possible, but you don't need to eradicate them.

I'd also recommend you debug your program with CLion or VSCode.

from cs431.

I believe we should use UnsafeCell<NodeBox<V>> for cursor.child instead of &mut NodeBox<V> to avoid UB.
See https://rust-lang.github.io/rust-clippy/master/index.html#cast_ref_to_mut .

from cs431.

While it is generally advisable to use UnsafeCell instead of raw pointers, replacing &mut Nodebox<V> with UnsafeCell<NodeBox<V>> is wrong: the former is essentially a pointer, while the latter is essentially a data.

from cs431.

oh that's right. I guess I mixed this up with something unrelated.

from cs431.