You are correct, and apart from calling wait_until with a time in the past (which is equivalent) there is no better way. You could always write a little wrapper if you want a more convenient syntax: template<typename R> bool is_ready(std::future<R> const& f) { return f.wait_for(std::chrono::seconds(0)) == std::future_status::ready; } N.B. if the function is deferred this … Read more
Yes, indeed. The datepicker has the maxdate property that you can set when you initialize it. Here’s the codez $(“#datepicker”).datepicker({ maxDate: new Date, minDate: new Date(2007, 6, 12) });
(I’m not completely happy with the answers so far, so here is my attempt…) I think that Kevin Wright’s comment You can make a Promise and it’s up to you to keep it. When someone else makes you a promise you must wait to see if they honour it in the Future summarizes it pretty … Read more
First about for comprehension. It was answered on SO many many times, that it’s an abstraction over a couple of monadic operations: map, flatMap, withFilter. When you use <-, scalac desugars this lines into monadic flatMap: r <- monad into monad.flatMap(r => … ) it looks like an imperative computation (what a monad is all … Read more
You can use Future.wait to wait for a list of futures: import ‘dart:async’; Future main() async { var data = []; var futures = <Future>[]; for (var d in data) { futures.add(d.loadData()); } await Future.wait(futures); } DartPad example
The trick is to first make sure that none of the futures has failed. .recover is your friend here, you can combine it with map to convert all the Future[T] results to Future[Try[T]]] instances, all of which are certain to be successful futures. note: You can use Option or Either as well here, but Try … Read more
From the RFC: The return type of an async function is a unique anonymous type generated by the compiler, similar to the type of a closure. You can think of this type as being like an enum, with one variant for every “yield point” of the function – the beginning of it, the await expressions, … Read more
You can use Future.wait to wait for several Future to be completed. body: FutureBuilder<List<FlashCardList>>( future: Future.wait([ fetchFlashCardList(), fetchFlashCardListFromDB(), ]),
If the library you want to use also offers a callback style method in addition to the Future style, you can provide it a handler that completes the CompletableFuture without any extra thread blocking. Like so: AsynchronousFileChannel open = AsynchronousFileChannel.open(Paths.get(“/some/file”)); // … CompletableFuture<ByteBuffer> completableFuture = new CompletableFuture<ByteBuffer>(); open.read(buffer, position, null, new CompletionHandler<Integer, Void>() { @Override … Read more
This is not yet a part of the Futures API, but may be added as an extension in the future. As a workaround, you could use the firstCompletedOf to wrap 2 futures – the future you want to cancel and a future that comes from a custom Promise. You could then cancel the thus created … Read more