Implemented Clone for IrcServer and updated multithreaded examples

accordingly.

examples/autoreconnect.rs

@@ -1,7 +1,6 @@
 extern crate irc;
 
 use std::default::Default;
-use std::sync::Arc;
 use std::thread::spawn;
 use irc::client::prelude::*;
 
@@ -12,7 +11,7 @@ fn main() {
         channels: Some(vec![format!("#vana")]),
         .. Default::default()
     };
-    let server = Arc::new(IrcServer::from_config(config).unwrap());
+    let server = IrcServer::from_config(config).unwrap();
     // FIXME: if set_keepalive is stabilized, this can be readded.
     // server.conn().set_keepalive(Some(5)).unwrap();
     let server = server.clone();

examples/multithreaded.rs

@@ -1,7 +1,6 @@
 extern crate irc;
 
 use std::default::Default;
-use std::sync::Arc;
 use std::thread::spawn;
 use irc::client::prelude::*;
 
@@ -12,7 +11,7 @@ fn main() {
         channels: Some(vec![format!("#vana")]),
         .. Default::default()
     };
-    let server = Arc::new(IrcServer::from_config(config).unwrap());
+    let server = IrcServer::from_config(config).unwrap();
     server.identify().unwrap();
     let server = server.clone();
     let _ = spawn(move || {

examples/tweeter.rs

@@ -1,7 +1,6 @@
 extern crate irc;
 
 use std::default::Default;
-use std::sync::Arc;
 use std::thread::{sleep, spawn};
 use std::time::Duration;
 use irc::client::prelude::*;
@@ -13,7 +12,7 @@ fn main() {
         channels: Some(vec![format!("#vana")]),
         .. Default::default()
     };
-    let server = Arc::new(IrcServer::from_config(config).unwrap());
+    let server = IrcServer::from_config(config).unwrap();
     server.identify().unwrap();
     let server2 = server.clone();
     // Let's set up a loop that just prints the messages.

src/client/server/mod.rs

@@ -37,6 +37,7 @@ pub struct IrcServer<T: IrcRead, U: IrcWrite> {
     state: Arc<ServerState<T, U>>,
 }
 
+/// Thread-safe internal state for an IRC server connection.
 struct ServerState<T: IrcRead, U: IrcWrite> {
     /// The thread-safe IRC connection.
     conn: Connection<T, U>,
@@ -81,6 +82,12 @@ impl IrcServer<BufReader<NetStream>, BufWriter<NetStream>> {
     }
 }
 
+impl<'a, T: IrcRead, U: IrcWrite> Clone for IrcServer<T, U> {
+    fn clone(&self) -> IrcServer<T, U> {
+        IrcServer { state: self.state.clone() }
+    }
+}
+
 impl<'a, T: IrcRead, U: IrcWrite> Server<'a, T, U> for IrcServer<T, U> {
     fn config(&self) -> &Config {
         &self.state.config