async-tcp & future-hello: use better futures functions

async-tcp/src/main.rs

@@ -3,11 +3,11 @@ extern crate bytes;
 extern crate futures;
 extern crate tokio;
 
-use tokio::io::AsyncWrite;
+use tokio::io::{self, AsyncWrite};
 use tokio::net::{TcpStream, tcp::ConnectFuture};
 use bytes::{Bytes, Buf};
 use futures::{Future, Async, Poll};
-use std::io::{self, Cursor};
+use std::io::{Cursor};
 
 enum HelloWorld {
     Connecting(ConnectFuture),
@@ -47,4 +47,11 @@ fn main() {
     let hello_world = HelloWorld::Connecting(connect_future);
 
     tokio::run(hello_world.map_err(|e| println!("{0}", e)));
+
+    let better_future = TcpStream::connect(&addr)
+        .and_then(|socket| io::write_all(socket, b"hello world"))
+        .map(|_| println!("write complete"))
+        .map_err(|_| println!("failed"));
+
+    tokio::run(better_future);
 }

future-hello-world/src/main.rs

@@ -37,4 +37,6 @@ where
 fn main() {
     let future = Display(HelloWorld);
     tokio::run(future);
+    let better_future = HelloWorld.map(|value| println!("{}", value));
+    tokio::run(better_future);
 }