Pfthb

I have a vector and I want to make multiple requests and get vector of values. Something like:

use actix_web::client;
let nums = vec![1, 2, 3];
let values = nums.map(|num| 
 client::ClientRequest::get("http://example.com".to_owned() + &num);
);

And I will get [1, 4, 9].

Said another way:

fn question_data(id: &str) -> Box<Future<Item = Question, Error = actix_web::error::Error>> 
 resp.body().limit(67_108_864).from_err().and_then(),
 )

Then I use it:

let question_ids = vec!["q1", "q2", "q3"];

let mut questions = questions_data().wait().expect("Failed to fetch questions");
let question = question_data("q2")
 .wait()
 .expect("Failed to fetch question");
println!(":?", question);

let data = question_ids.map(|id| Box::new(question_data(id)));

But I get the error:

245 | let data = question_ids.map(|id| Box::new(question_data(id)));
 | ^^^
 |
 = note: the method `map` exists but the following trait bounds were not satisfied:
 `&mut std::vec::Vec<std::string::String> : futures::Future`
 `&mut std::vec::Vec<std::string::String> : std::iter::Iterator`
 `&mut [std::string::String] : futures::Future`
 `&mut [std::string::String] : std::iter::Iterator`

These are similar but does not compile for me, and also I want to use actix-web:

• Getting multiple URLs concurrently with Hyper


• How can I perform parallel asynchronous HTTP GET requests with reqwest?


• How do I iterate over a Vec of functions returning Futures in Rust?


• https://www.reddit.com/r/rust/comments/7wwhhk/patterns_for_processing_a_stream_of_urls/du4jw0t/