Vendor things

third-party/vendor/generator/examples/cd.rs

@@ -0,0 +1,64 @@
+use generator::*;
+
+#[derive(Debug)]
+enum Action {
+    Play(&'static str),
+    Stop,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq)]
+enum State {
+    Playing,
+    Stopped,
+}
+
+use crate::Action::*;
+use crate::State::*;
+
+fn main() {
+    let mut cd_player = Gn::new_scoped(|mut s| {
+        let mut state = Stopped;
+        loop {
+            // println!("{:?}", *state);
+            // in release mod without this there is bugs!!!!! (rustc 1.59.0 (9d1b2106e 2022-02-23))
+            std::sync::atomic::compiler_fence(std::sync::atomic::Ordering::AcqRel);
+
+            match state {
+                Stopped => match s.get_yield() {
+                    Some(Play(t)) => {
+                        println!("I'm playing {t}");
+                        state = Playing;
+                    }
+                    Some(Stop) => println!("I'm already stopped"),
+                    _ => unreachable!("some thing wrong"),
+                },
+
+                Playing => match s.get_yield() {
+                    Some(Stop) => {
+                        println!("I'm stopped");
+                        state = Stopped;
+                    }
+                    Some(Play(_)) => println!("should first stop"),
+                    _ => unreachable!("some thing wrong"),
+                },
+            }
+
+            s.yield_with(state);
+        }
+    });
+
+    for _ in 0..1000 {
+        let ret = cd_player.send(Play("hello world"));
+        assert_eq!(ret, Playing);
+        let ret = cd_player.send(Play("hello another day"));
+        assert_eq!(ret, Playing);
+        let ret = cd_player.send(Stop);
+        assert_eq!(ret, Stopped);
+        let ret = cd_player.send(Stop);
+        assert_eq!(ret, Stopped);
+        let ret = cd_player.send(Play("hello another day"));
+        assert_eq!(ret, Playing);
+        let ret = cd_player.send(Stop);
+        assert_eq!(ret, Stopped);
+    }
+}