Bench boxed boxed

Author: stepancheg

benches/boxed_boxed.rs

@@ -0,0 +1,49 @@
+#![feature(test)]
+
+extern crate test;
+extern crate futures;
+
+use test::Bencher;
+
+use futures::Async;
+use futures::stream;
+use futures::stream::Stream;
+
+
+fn drain<S : Stream<Item=u32, Error=()>>(mut s: S) {
+    loop {
+        match s.poll() {
+            Ok(Async::Ready(Some(i))) => { test::black_box(i); },
+            Ok(Async::Ready(None)) => return,
+            _ => unreachable!(),
+        }
+    }
+}
+
+#[bench]
+fn plain(b: &mut Bencher) {
+    b.iter(|| {
+        drain(stream::iter::<_, _, ()>((0..1000).map(Ok)));
+    })
+}
+
+#[bench]
+fn boxed(b: &mut Bencher) {
+    b.iter(|| {
+        drain(stream::iter::<_, _, ()>((0..1000).map(Ok)).boxed());
+    })
+}
+
+#[bench]
+fn boxed_boxed(b: &mut Bencher) {
+    b.iter(|| {
+        drain(stream::iter::<_, _, ()>((0..1000).map(Ok)).boxed().boxed());
+    })
+}
+
+#[bench]
+fn boxed_boxed_boxed(b: &mut Bencher) {
+    b.iter(|| {
+        drain(stream::iter::<_, _, ()>((0..1000).map(Ok)).boxed().boxed().boxed());
+    })
+}