## Autumn of Rust <img src="https://i.imgur.com/0cFdjSJ.png" width="300"/> --- ## Borrow Checker  --- ## Memory Safety --- ## What do we want to be safe? ---  --- ## Undefined behaviour --- ## Example ```rust // Flip a coin if coin is heads { print("the password is 'secret'") } else { print("the password is '123456'") } ``` --- ## What if it wasn't you flipping the coin? --- ## Segfaults  --- ## Computers don't work in a set order --- ## Double Free *When you do cleaning twice for fun!* --- ## Use After Free *Just because garbage day has passed doesn't mean that we can't dumpster dive!* --- ## Buffer Overflow *Don't have enough space? Just overwrite your neighbours!* --- ## Memory Leak *Why clean up when we're done? The user can just reboot their computer, right?* ---  --- ## Compilers! --- ## Parser -> Syntax -> Semantics --- ## Trains --- :dragon_face: --- ## Painting the dragon :dragon_face: :lower_left_paintbrush: --- ## Sharing the dragon :dragon_face: :woman: :frame_with_picture: :man: :frame_with_picture: :woman: :frame_with_picture: --- ## Moved ```rust fn double_num(num: i32) -> i32 { return num * 2; } ``` --- ## Borrowed (immutably) ```rust fn double_num(num: &i32) -> i32 { // Can't be changed } ``` --- ## Borrowed (mutably) ```rust fn double_num(num: &mut i32) { num = num * 2; } ```