feat: Make the future module no_std

Author: k-nasa

src/future/future/mod.rs

@@ -21,8 +21,8 @@ cfg_unstable_default! {
 }
 
 extension_trait! {
-    use std::pin::Pin;
-    use std::ops::{Deref, DerefMut};
+    use core::pin::Pin;
+    use core::ops::{Deref, DerefMut};
 
     use crate::task::{Context, Poll};
 
@@ -136,7 +136,7 @@ extension_trait! {
 
         [`Future`]: ../future/trait.Future.html
     "#]
-    pub trait FutureExt: std::future::Future {
+    pub trait FutureExt: core::future::Future {
         /// Returns a Future that delays execution for a specified time.
         ///
         /// # Examples

src/future/mod.rs

@@ -46,15 +46,20 @@
 //! [`Future::race`]: trait.Future.html#method.race
 //! [`Future::try_race`]: trait.Future.html#method.try_race
 
-pub use future::Future;
-pub use pending::pending;
-pub use poll_fn::poll_fn;
-pub use ready::ready;
+cfg_no_std! {
+    pub use future::Future;
+    pub(crate) mod future;
+}
+
+cfg_std! {
+    pub use pending::pending;
+    pub use poll_fn::poll_fn;
+    pub use ready::ready;
 
-pub(crate) mod future;
-mod pending;
-mod poll_fn;
-mod ready;
+    mod pending;
+    mod poll_fn;
+    mod ready;
+}
 
 cfg_default! {
     pub use timeout::{timeout, TimeoutError};

src/lib.rs

@@ -243,10 +243,10 @@ mod macros;
 
 cfg_no_std! {
     pub mod task;
+    pub mod future;
 }
 
 cfg_std! {
-    pub mod future;
     pub mod io;
     pub mod os;
     pub mod prelude;