Expand description
Simple sparse set implementation.
let mut s: SparseSet<_, 1024> = SparseSet::new();
assert!(!s.has(0));
s.insert(0, 23);
s.insert(2048, 37);
s.insert(512, 42);
s[2048] = 23;
assert_eq!(s[0], 23);
assert_eq!(s[512], 42);
assert_eq!(s[2048], 23);