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futures-concurrency 3.0.2

Concurrency extensions for Future
Documentation 
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pub(crate) mod array;
pub(crate) mod tuple;
pub(crate) mod vec;

/// Wait for the first future to complete.
///
/// Awaits multiple futures simultaneously, returning the output of the first
/// future which completes.
#[async_trait::async_trait(?Send)]
pub trait Race {
    /// The resulting output type.
    type Output;

    /// Waits for multiple futures to complete.
    ///
    /// Awaits multiple futures simultaneously, returning the output of the
    /// futures once both complete.
    ///
    /// This function returns a new future which polls both futures
    /// concurrently.
    async fn race(self) -> Self::Output;
}