Address some review comments on #1328

core/src/either.rs

@@ -19,7 +19,7 @@
 // DEALINGS IN THE SOFTWARE.
 
 use crate::{muxing::StreamMuxer, ProtocolName, transport::ListenerEvent};
-use futures::prelude::*;
+use futures::{prelude::*, io::{IoSlice, IoSliceMut}};
 use pin_project::{pin_project, project};
 use std::{fmt, io::{Error as IoError}, pin::Pin, task::Context, task::Poll};
 
@@ -77,6 +77,17 @@ where
             EitherOutput::Second(b) => AsyncRead::poll_read(b, cx, buf),
         }
     }
+
+    #[project]
+    fn poll_read_vectored(self: Pin<&mut Self>, cx: &mut Context, bufs: &mut [IoSliceMut])
+        -> Poll<Result<usize, IoError>>
+    {
+        #[project]
+        match self.project() {
+            EitherOutput::First(a) => AsyncRead::poll_read_vectored(a, cx, bufs),
+            EitherOutput::Second(b) => AsyncRead::poll_read_vectored(b, cx, bufs),
+        }
+    }
 }
 
 impl<A, B> AsyncWrite for EitherOutput<A, B>
@@ -93,6 +104,17 @@ where
         }
     }
 
+    #[project]
+    fn poll_write_vectored(self: Pin<&mut Self>, cx: &mut Context, bufs: &[IoSlice])
+        -> Poll<Result<usize, IoError>>
+    {
+        #[project]
+        match self.project() {
+            EitherOutput::First(a) => AsyncWrite::poll_write_vectored(a, cx, bufs),
+            EitherOutput::Second(b) => AsyncWrite::poll_write_vectored(b, cx, bufs),
+        }
+    }
+
     #[project]
     fn poll_flush(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Result<(), IoError>> {
         #[project]