future Questions
5
Solved
I usually see the use of either promise and future in the start of a vert.x verticle. Is there any specific difference between both?
I have read about their differences in Scala language, is it the...
2
Solved
Hello
I'm trying to make my first social app with Flutter and I'm stuck.
I would like to get my messages (in a conversasion between tow users) from my api.
Not a probleme when I use Future and Futu...
Aime asked 17/6, 2020 at 16:32
2
Solved
I would like to wait for a bool to be true, then return from a Future, but I can't seem to make my Future to wait for the Stream.
Future<bool> ready() {
return new Future<bool>(() {
...
3
Solved
The following program fails to link with clang and -stdlib=libstdc++:
$ cat future.cpp
#include <iostream>
#include <future>
int main()
{
std::future<int> f1 = std::async([](){...
2
Solved
I have tried to compile coroutine example from the CppCon presentation https://youtu.be/ZTqHjjm86Bw?t=560
Unfortunately compilation fails:
$ g++-10 -pedantic -Wall -std=c++20 -fcoroutines main.cpp...
Pasco asked 8/2, 2021 at 17:35
2
Solved
I am writing a code in flutter in which I am using an SQFlite database. I want to insert image widget from the assets, and I am getting the name of the image from database.
@override
Widget buil...
3
Solved
I am using Boost 1.66.0, in which asio has built-in support for interoperating with futures (and for some time now). The examples I've seen online indicate how to achieve this cleanly when using ne...
Prate asked 20/4, 2018 at 22:55
2
I am currently making the Udacity Sunshine project in Flutter. I have two different provider to fetch current temperature and daily forecasts.
I want to combine the two providers and make a new sin...
Bashemath asked 11/11, 2021 at 14:12
3
Solved
I am trying to use hyper to grab the content of an HTML page and would like to synchronously return the output of a future. I realized I could have picked a better example since synchronous HTTP re...
Centenarian asked 26/9, 2018 at 15:21
2
Solved
I have recently seen some code example like below
Future<Null> ensureLogin() {...}
var login = ensureLogin();
Future functionA() async {
await login;
print("FunctionA finished");
}
Futu...
Lefton asked 25/9, 2018 at 14:27
2
Solved
I have a main function, where I create a Tokio runtime and run two futures on it.
use tokio;
fn main() {
let mut runtime = tokio::runtime::Runtime::new().unwrap();
runtime.spawn(MyMegaFutureNu...
Tailwind asked 24/11, 2018 at 13:43
6
Solved
I would like to know when to use a FutureBuilder and how is it usefull, given the fact that a widget can be built multiple times during its life time and not only when we setState or update it, so ...
Milker asked 14/7, 2021 at 5:12
1
To check for internet connection i am using data_connection_checker package but it seems that I am not getting how to use it.
I am using following code to check internet connection by calling in in...
Procrustean asked 14/3, 2021 at 13:4
4
Solved
Is there a way to convert a
Either[A, Future[B]]
to a
Future[Either[A, B]]
I have in mind something like the Future.sequence method which converts from a List[Future] to a Future[List]
7
Solved
How can I convert Option[Future[T]] to Future[Option[T]] in scala?
I want to use it in:
val customerAddresses = for {
a <- addressDAO.insert(ca.address) // Future[Address]
ia <- ca.invoic...
4
Solved
I am trying to use OptionT to combine methods returning Future[Option[T]] in a for-comprehension.
import cats.data._
import cats.implicits._
import cats.instances.future._
for {
data <- Opti...
Encircle asked 13/4, 2017 at 9:29
6
Solved
Both futures and promises block until they have calculated their values, so what is the difference between them?
Deed asked 7/1, 2011 at 7:51
2
I am trying to return Map from Future after taking values from database but I'm unable to print the values. Getting below error while accessing values
The type 'Future<Map<String, dynamic>...
Cowherb asked 26/8, 2020 at 8:4
2
Solved
Is there an existing API to group a list of Future object into one so that I can wait for all to complete? Like in javascript's Promise.all.
2
Solved
Iam using flutter and I am trying to get a value from shared_preferences that I had set before, and display it in a text widget. but i get Instance of Future<String> instead of the value. her...
3
Solved
I have a scenario where I have to poll a remote server checking if a task has completed. Once it has, I make a different call to retrieve the result.
I originally figured I should use a SingleThrea...
Metametabel asked 25/10, 2016 at 23:48
4
Solved
I like to know the differences between Future.delayed and Timer method for delaying code execution. Both seem to do the same thing.
Future.delayed
Future.delayed(const Duration(milliseconds: 500)...
3
Solved
Lets say that in Dart/Flutter you have the following code:
void myOperation() {
// could be anything
print('you didn't cancel me!');
}
Notice that the operation itself is not asynchronous and is...
Hellenism asked 26/2, 2021 at 5:29
1
Solved
Is there any way I can clone values for the async move closures for futures::stream?
I'm using future's for_each_concurrent
My code is something like this:
async fn foo() {
use futures::stream::{s...
Marsha asked 1/3, 2021 at 21:0
2
Solved
In Dart,
what is the difference between saying
Future<void> doStuff() async { ...
and
void doStuff() async { ...
I know what a Future<T> is and how async/await work generally, but I n...
Uturn asked 24/2, 2021 at 2:55
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