Accept ToSocketAddrs

[dtolnay]

The methods that currently accept SocketAddr or &SocketAddr as an argument could take A: ToSocketAddrs, which is implemented for str and various other helpful types.

• This would match the signatures of std::net's TcpListener, TcpStream, and UdpSocket.
• It would save a parse().unwrap() in all of our example code.

[alexcrichton]

Oh this is actually explicitly avoided in mio because of the semantics of ToSocketAddrs. Right now ToSocketAddrs will perform a blocking DNS call (e.g. getaddrinfo) which is something that mio, a crate for nonblocking I/O, in general wants to discourage. In that sense all we really want is T: TryInto<SocketAddr> in the sense that string parsing is fine but we don't want DNS lookups to happen.

That being said, this has come up a few times, so I think it'd at least be worth explicitly documenting!

[dtolnay]

Okay, makes sense. I agree, let's document this!

[carllerche]

Closing due to inactivity.