Added `ESock::transfer_reader()`, `ESock::transfer_writer()`: Specific versions of `transfer_state()`.

Fortune for rsh's current commit: Half blessing − 半吉

src/sock/enc.rs

@@ -182,6 +182,38 @@ pub struct ESock<W, R> {
 
 impl<W: AsyncWrite, R: AsyncRead> ESock<W, R>
 {
+    /// Move this `ESock`'s state into another with a different reader, returning the new `ESock` and the old reader stream
+    pub fn transfer_reader<Rx>(self, rx: Rx) -> (ESock<W, Rx>, (R,))
+    where Rx: AsyncRead
+    {
+	let ESock { info, state, rx: orx, tx } = self;
+	
+	let (orx, rx) = {
+	    let (s, c) = orx.into_parts();
+
+	    (s, AsyncSource::from_parts(rx, c))
+	};
+
+	(ESock {
+	    state, info, tx, rx
+	}, (orx,))
+    }
+    /// Move this `ESock`'s state into another with a different writer, returning the new `ESock` and the old writer stream
+    pub fn transfer_writer<Wx>(self, tx: Wx) -> (ESock<Wx, R>, (W,))
+    where Wx: AsyncWrite
+    {
+	let ESock { info, state, rx, tx: otx } = self;
+
+	let (otx, tx) = {
+	    let (s, c) = otx.into_parts();
+
+	    (s, AsyncSink::from_parts(tx, c))
+	};
+
+	(ESock {
+	    info, state, tx, rx
+	}, (otx,))
+    }
     /// Move this `ESock`'s state into another, returning the new `ESock` and the old streams
     pub fn transfer_state<Wx, Rx>(self, tx: Wx, rx: Rx) -> (ESock<Wx, Rx>, (W, R))
     where Wx: AsyncWrite,