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POUsing Rust and the match statement how can I assign a TcpListener?
 

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  1. POUsing Rust and the match statement how can I assign a TcpListener?
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    <p>I'm learning Rust in my spare time, and I'm having trouble finding the answer to this problem. The code below which has been slightly modified appeared on Stack-O in answer to another question.I have split lines 9 and 14 for my testing purposes, but that is not essential.</p> <p>What I would like to do is to use the match statement to assign the variable from line 8/9, or from lines 8/9 and 14 combined would also be suitable.</p> <p>Could someone please show me how to this using the match statement?</p> <pre><code>001 use std::cell::Cell; 002 use std::rt::io::{Writer, Listener, Acceptor}; 003 use std::rt::io::net::tcp::TcpListener; 004 use std::rt::io::net::ip::{SocketAddr, Ipv4Addr}; 005 006 fn main() { 007 008 let o_listener = TcpListener::bind( 009 SocketAddr { ip: Ipv4Addr(127, 0, 0, 1), port: 9123}).listen(); 010 011 print ("Listener opened : "); 012 std::io::stdin().read_line(); 013 014 let mut o_acceptor = o_listener.unwrap(); 015 016 println("listener is ready"); 017 loop { 018 let stream = Cell::new(o_acceptor.accept().unwrap()); 019 do spawn { 020 let mut stream = stream.take(); 021 stream.write(bytes!("Hello World\r\n")); 022 } 023 } 024 } </code></pre> <p>Example Only: For example using something like the following, but obviously for the above problem:</p> <pre><code>extern mod sqlite; fn db() { let database = match sqlite::open("test.db") { Ok(result) =&gt; result, Err(error) =&gt; { println(fmt!("Error opening test.db: %?", error)); return; } }; </code></pre> <p>Edited Update : 12 hours after posting question <strong><em>*</em></strong></p> <p>I'm using 0.8 on Win8</p> <p>The following is an example of the problem that I would very-much like a solution to :</p> <pre><code>001 use std::cell::Cell; 002 use std::rt::io::{Writer, Listener, Acceptor}; 003 use std::rt::io::net::tcp::TcpListener; 004 use std::rt::io::net::ip::{SocketAddr, Ipv4Addr}; 005 006 fn main() { 007 008 // This works : 009 // let o_listener = TcpListener::bind( 010 // SocketAddr { ip: Ipv4Addr(127, 0, 0, 1), port: 9123}).listen(); 011 012 // This doesn't work, and results in compile errors below: 013 let o_listener = match TcpListener::bind( 014 SocketAddr { ip: Ipv4Addr(127, 0, 0, 1), port: 9123}).listen() { 015 Some(result) =&gt; result, 016 None =&gt; fail!("Failed to open listener") 017 }; 018 019 // this works in combination with lines 9/10 020 let mut o_acceptor = match o_listener { 021 Some(result) =&gt; result, 022 None =&gt; fail!("Failed to open acceptor.") 023 }; </code></pre> <p>The attempt to compile the above results in (part only) :</p> <pre><code>test_tcp_008.rs:20:8: 20:20 error: mismatched types: expected `std::rt::io::net: :tcp::TcpAcceptor` but found `std::option::Option&lt;&lt;V21&gt;&gt;` (expected struct std:: rt::io::net::tcp::TcpAcceptor but found enum std::option::Option) test_tcp_008.rs:20 Some(result) =&gt; result, </code></pre> <p>This also does not work (compile error) :</p> <pre><code>fn main() { let mut o_acceptor = match TcpListener::bind( SocketAddr { ip: Ipv4Addr(127, 0, 0, 1), port: 9123}) .listen().unwrap() { Some(result) =&gt; result, None =&gt; fail!("Failed to open Listener/Acceptor.") }; </code></pre>
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