Function ctx::with_cancel

pub fn with_cancel(parent: Context) -> (Context, Box<Fn() + Send>)

Returns a copy of parent as a new future, which is closed when the returned cancel function is called or when the parent context's future is resolved – whichever happens first.

Example

extern crate ctx;
extern crate futures;

use ctx::{Context, ContextError, with_cancel, background};
use futures::future::Future;

fn main() {
    let (ctx, cancel) = with_cancel(background());
    cancel();

    assert_eq!(ctx.wait().unwrap_err(), ContextError::Canceled);
}