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//! Choose your preferred executor to power a runtime.
mod null;
#[cfg(all(not(target_arch = "wasm32"), feature = "thread-pool"))]
mod thread_pool;
#[cfg(all(not(target_arch = "wasm32"), feature = "tokio"))]
mod tokio;
#[cfg(all(not(target_arch = "wasm32"), feature = "async-std"))]
mod async_std;
#[cfg(all(not(target_arch = "wasm32"), feature = "smol"))]
mod smol;
#[cfg(target_arch = "wasm32")]
mod wasm_bindgen;
pub use null::Null;
#[cfg(all(not(target_arch = "wasm32"), feature = "thread-pool"))]
pub use thread_pool::ThreadPool;
#[cfg(all(not(target_arch = "wasm32"), feature = "tokio"))]
pub use self::tokio::Tokio;
#[cfg(all(not(target_arch = "wasm32"), feature = "async-std"))]
pub use self::async_std::AsyncStd;
#[cfg(all(not(target_arch = "wasm32"), feature = "smol"))]
pub use self::smol::Smol;
#[cfg(target_arch = "wasm32")]
pub use wasm_bindgen::WasmBindgen;
use crate::MaybeSend;
use futures::Future;
/// A type that can run futures.
pub trait Executor: Sized {
/// Creates a new [`Executor`].
fn new() -> Result<Self, futures::io::Error>
where
Self: Sized;
/// Spawns a future in the [`Executor`].
fn spawn(&self, future: impl Future<Output = ()> + MaybeSend + 'static);
/// Runs the given closure inside the [`Executor`].
///
/// Some executors, like `tokio`, require some global state to be in place
/// before creating futures. This method can be leveraged to set up this
/// global state, call a function, restore the state, and obtain the result
/// of the call.
fn enter<R>(&self, f: impl FnOnce() -> R) -> R {
f()
}
}
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