1 files changed, 38 insertions, 0 deletions
diff --git a/futures/src/backend/default.rs b/futures/src/backend/default.rs
new file mode 100644
index 00000000..76264f55
--- /dev/null
+++ b/futures/src/backend/default.rs
@@ -0,0 +1,38 @@
+//! A default, cross-platform backend.
+//!
+//! - On native platforms, it will use:
+//!   - `backend::native::tokio` when the `tokio` feature is enabled.
+//!   - `backend::native::async-std` when the `async-std` feature is
+//!     enabled.
+//!   - `backend::native::smol` when the `smol` feature is enabled.
+//!   - `backend::native::thread_pool` otherwise.
+//!
+//! - On Wasm, it will use `backend::wasm::wasm_bindgen`.
+#[cfg(not(target_arch = "wasm32"))]
+mod platform {
+    #[cfg(feature = "tokio")]
+    pub use crate::backend::native::tokio::*;
+
+    #[cfg(all(feature = "async-std", not(feature = "tokio"),))]
+    pub use crate::backend::native::async_std::*;
+
+    #[cfg(all(
+        feature = "smol",
+        not(any(feature = "tokio", feature = "async-std")),
+    ))]
+    pub use crate::backend::native::smol::*;
+
+    #[cfg(not(any(
+        feature = "tokio",
+        feature = "async-std",
+        feature = "smol",
+    )))]
+    pub use crate::backend::native::thread_pool::*;
+}
+
+#[cfg(target_arch = "wasm32")]
+mod platform {
+    pub use crate::backend::wasm::wasm_bindgen::*;
+}
+
+pub use platform::*;