Zero-cost interior mutability - proposal

scottmcm · November 12, 2024, 1:32am

You can couple this with temporaries & deref for a fun way of doing it, too.

I tossed together a sketch of it here, for example:

scottmcm/pawn-rs/blob/73ddbe1bf906ab14c749789ca191e169674c1b15/src/lib.rs#L53-L82


      
          #[test]
          fn it_works() {
              let v = Cell::new(vec![1]);
              v.pawn().push(2);
              {
                  let mut t = v.pawn();
                  t.push(3);
                  t.push(4);
              }
              assert_eq!(v.into_inner(), [1, 2, 3, 4]);
          }
          
          #[test]
          fn pawn_twice() {
              let v = Cell::new(vec![1]);
              {
                  let mut a = v.pawn();
                  assert_eq!(a[..], [1]);
          
                  // You can pawn something again without failing,

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Zero-cost interior mutability - proposal

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