feat: add async-fn

2024-03-23 23:34:02 +08:00
parent bb36536347
commit e5748b1e41
4 changed files with 497 additions and 1 deletions
--- a/README.md
+++ b/README.md
@@ -13,6 +13,7 @@ Project or files:
 │   └── zstd-demo
 ├── __concurrent
 │   ├── arc-swap
+│   ├── async-fn-resumed-after-completion
 │   ├── async_study
 │   ├── crossbeam_n_parking_lot
 │   ├── glommio
@@ -202,6 +203,7 @@ Project or files:
 ├── __shuttle
 │   └── hatter-test
 ├── __std
+│   ├── async-fn
 │   ├── async_await
 │   ├── into
 │   ├── iter
@@ -282,6 +284,6 @@ Project or files:
    ├── vec.rs
    └── while.rs

-251 directories, 40 files
+253 directories, 40 files
 ```

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+++ b/__std/async-fn/Cargo.lock
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--- a/__std/async-fn/Cargo.toml
+++ b/__std/async-fn/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "async-fn"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+tokio = { version = "1.36.0", features = ["full"] }
--- a/__std/async-fn/src/main.rs
+++ b/__std/async-fn/src/main.rs
@@ -0,0 +1,64 @@
+use std::future::Future;
+
+use tokio::task::yield_now;
+
+macro_rules! async_fn_mut {
+    ($statement:block) => {{
+        struct A {}
+        impl AsyncFnMut<()> for A {
+            type Output = ();
+
+            async fn call(&mut self, _args: ()) -> Self::Output {
+                $statement
+            }
+        }
+        A{}
+    }};
+}
+
+
+#[tokio::main]
+async fn main() {
+    println!(">>>>> case 1");
+    do_something(|| async {
+        println!("in callback");
+        yield_now().await;
+    }).await;
+
+    println!(">>>>> case 2");
+    struct A {}
+    impl AsyncFnMut<()> for A {
+        type Output = ();
+
+        async fn call(&mut self, _args: ()) -> Self::Output {
+            println!("in callback-2");
+            yield_now().await;
+        }
+    }
+    do_something2(A {}).await;
+
+    println!(">>>>> case 3");
+    do_something2(async_fn_mut!({
+            println!("in callback-2");
+            yield_now().await;
+    })).await;
+}
+
+trait AsyncFnMut<A> {
+    type Output;
+    async fn call(&mut self, args: A) -> Self::Output;
+}
+
+async fn do_something<C, F>(mut callback: C)
+    where C: FnMut() -> F,
+          F: Future<Output=()> {
+    println!("before callback");
+    callback().await;
+    println!("after callback");
+}
+
+async fn do_something2<C>(mut callback: C) where C: AsyncFnMut<(), Output=()> {
+    println!("before callback-2");
+    callback.call(()).await;
+    println!("after callback-2");
+}