Manipulating an object from inside a loop that borrows it

Question

I\'m writing some code in Rust that connects to a remote server, and depending on the messages sent by that server, computes some statistics or executes actions based on the

Answer 1

In order to allow mutability in an Iterator, you should use iter_mut() and work on mutable references (&mut message). Then, to avoid the additional borrow, you could just perform the addition in the body of the loop:

for &mut message in self.server.iter_mut() {
    println!("Received {}", message);
    *self.counters.entry(message).or_insert(0) += 1;
}