Type Alias BoxFuture 

pub type BoxFuture<T> = Pin<Box<dyn Future<Output = T> + Send + 'static>>;

Available on crate feature std only.

Boxed, owned, Send future of unit output — the shape Runtime::spawn and Runtime::sleep work in.

'static lifetime because spawned futures outlive any borrow at the call site; Send because the default tokio impl is multi-threaded and the futures cross thread boundaries. On the single-threaded WASM / WASI impls the Send bound is harmless — a single-threaded executor still accepts Send futures.

Aliased Type

pub struct BoxFuture<T> { /* private fields */ }