Promises are future values. They will only resolve once. This crate gives an implementation of Promises to work with Futures and Tokio
Watched variables are variables that will emit a signal upon being altered.
This crate offers an RAII implementation of watched variables, to work with Futures and Tokio.
In this case, the signal is a futures::Stream that will return a clone of the new value of the watched variable
whenever it is mutated.
This crate will notify the VariableWatched obtained from a WatchedVariable whenever one of its accessors (obtained through lock())
is dropped. If said accessor has been mutably derefenced, then the WatchedVariable will be considered to have been mutated.