1 | initial version |
To create a function similar to Rust's useState that utilizes closures to retrieve and modify state, you can follow these steps:
Here's an example implementation:
fn useState<T: Clone + 'static>(initial_state: T) -> (T, Box<dyn FnMut(T)>) {
let mut state = initial_state;
let set_state = Box::new(move |new_state| {
state = new_state;
});
(state.clone(), set_state)
}
This implementation uses generics to ensure that the state can be of any type that is both clonable and 'static. The initial state is cloned to avoid ownership issues. The setState closure is defined inside a Box to ensure that it can be stored on the heap and have a stable address. The move keyword is used to capture the state variable by value, allowing it to be modified inside the closure.