added DualStream AsRef and AsMut impls for dynamic dispatching to AsyncWrite

TODO: Maybe add impl Borrow for the same thing

src/dual.rs

@@ -27,7 +27,24 @@ pub enum DualStream<S>
     Plain(S),
 }
 
-//pub type Error = openssl::error::ErrorStack;
+// We can use dynamic dispatching to prevent the need to check the enum's discriminant each time. (In theory. It might not be that useful unless we add `Unpin` here too. TODO: Check this later.)
+impl<'a, S: AsyncWrite> AsRef<dyn AsyncWrite + 'a> for DualStream<S>
+where S: 'a
+{
+    fn as_ref(&self) -> &(dyn AsyncWrite + 'a)
+    {
+	self.as_dyn()
+    }
+}
+
+impl<'a, S: AsyncWrite> AsMut<dyn AsyncWrite + 'a> for DualStream<S>
+where S: 'a
+{
+    fn as_mut(&mut self) -> &mut (dyn AsyncWrite + 'a)
+    {
+	self.as_dyn_mut()
+    }
+}
 
 impl<'a, S: AsyncWrite + Unpin> DualStream<S>
 where S: 'a
@@ -72,6 +89,31 @@ where S: 'a
 	Ok(())
     }
 }
+
+impl<'a, S: AsyncWrite> DualStream<S>
+where S: Unpin + 'a
+{
+    /// As an immutable dynamic object for `Unpin` streams.
+    pub fn as_dyn_unpin(&self) -> &(dyn AsyncWrite + Unpin + 'a)
+    {
+	match self {
+	    Self::Plain(p) => p,
+	    Self::Encrypted(e) => e,
+	    _ => panic!("Poisoned")
+	}
+    }
+
+    /// As a mutable dynamic object for `Unpin` streams
+    pub fn as_dyn_unpin_mut(&mut self) -> &mut (dyn AsyncWrite + Unpin + 'a)
+    {
+	match self {
+	    Self::Plain(p) => p,
+	    Self::Encrypted(e) => e,
+	    _ => panic!("Poisoned")
+	}
+    }
+}
+
 impl<'a, S: AsyncWrite> DualStream<S>
 where S: 'a
 {
@@ -198,18 +240,18 @@ where S: 'a
 	}
     }
 
-    /// As an immutable dynamic object
-    pub fn as_dyn(&self) -> &(dyn AsyncWrite + 'a)
+    /// Consume into the inner (plain) stream
+    #[inline] pub fn into_inner(self) -> S
     {
 	match self {
 	    Self::Plain(p) => p,
-	    Self::Encrypted(e) => e,
+	    Self::Encrypted(e) => e.into_inner(),
 	    _ => panic!("Poisoned")
 	}
     }
-
-    /// As a mutable dynamic object 
-    pub fn as_dyn_mut(&mut self) -> &mut (dyn AsyncWrite + 'a)
+    
+    /// As an immutable dynamic object
+    pub fn as_dyn(&self) -> &(dyn AsyncWrite + 'a)
     {
 	match self {
 	    Self::Plain(p) => p,
@@ -218,12 +260,12 @@ where S: 'a
 	}
     }
 
-    /// Consume into the inner (plain) stream
-    #[inline] pub fn into_inner(self) -> S
+    /// As a mutable dynamic object 
+    pub fn as_dyn_mut(&mut self) -> &mut (dyn AsyncWrite + 'a)
     {
 	match self {
 	    Self::Plain(p) => p,
-	    Self::Encrypted(e) => e.into_inner(),
+	    Self::Encrypted(e) => e,
 	    _ => panic!("Poisoned")
 	}
     }