How to store async functions in a vector?

help
#1

I want to store a few function pointers following the similar interface (all are asyncs, have the same arguments and the same return value) in a vector, so that I could iterate over each of those and call them with my arguments and get results.
playground

struct Profile;
async fn get_steam_profile_info(id: &str) -> Result<Profile, ()> { Ok(Profile) }
async fn get_fortnite_profile_info(id: &str) -> Result<Profile, ()> { Ok(Profile) }

fn main() {
    let fetchers = vec![get_steam_profile_info, get_fortnite_profile_info];
}
#2

Something like this works:

struct Profile;

use futures::future::{Future, BoxFuture};
type ProfileInfoGetter = fn(&str) -> BoxFuture<'_, Result<Profile, ()>>;
async fn get_steam_profile_info(id: &str) -> Result<Profile, ()> {
    Ok(Profile)
}
async fn get_fortnite_profile_info(id: &str) -> Result<Profile, ()> {
    Ok(Profile)
}

fn main() {
    let fetchers: Vec<ProfileInfoGetter> =
        vec![
            |id| Box::pin(get_steam_profile_info(id)),
            |id| Box::pin(get_fortnite_profile_info(id)),
        ];
}

Note that this may be a somewhat nontrivial task in and by itself in case you want to call the async fns in parallel.

#3

Thank you very much for your answer. I'll try this out.
And no, I need these functions to be called sequentially, not, want to call each one of them until I get an Ok result, so your solution should work perfectly.

#4

Check out this thread: