Expand description
Capture a closure’s environment by value.
move converts any variables captured by reference or mutable reference
to variables captured by value.
let data = vec![1, 2, 3];
let closure = move || println!("captured {data:?} by value");
// data is no longer available, it is owned by the closureRunNote: move closures may still implement Fn or FnMut, even though
they capture variables by move. This is because the traits implemented by
a closure type are determined by what the closure does with captured
values, not how it captures them:
fn create_fn() -> impl Fn() {
let text = "Fn".to_owned();
move || println!("This is a: {text}")
}
let fn_plain = create_fn();
fn_plain();Runmove is often used when threads are involved.
let data = vec![1, 2, 3];
std::thread::spawn(move || {
println!("captured {data:?} by value")
}).join().unwrap();
// data was moved to the spawned thread, so we cannot use it hereRunmove is also valid before an async block.
let capture = "hello".to_owned();
let block = async move {
println!("rust says {capture} from async block");
};RunFor more information on the move keyword, see the closures section
of the Rust book or the threads section.