std: Add net::IpAddr, destabilize lookup_host

This commits adds back an `IpAddr` enum matching the `SocketAddr` enum, but
without a port. The enumeration is `#[unstable]`. The `lookup_host` function and
iterator are also destabilized behind a new feature gate due to questions around
the semantics of returning `SocketAddr` values.

1 files changed, 12 insertions, 12 deletions

diff --git a/src/libstd/sys/common/net2.rs b/src/libstd/sys/common/net2.rs
index 25aeab1b4ff..e213a86644f 100644
--- a/src/libstd/sys/common/net2.rs
+++ b/src/libstd/sys/common/net2.rs
@@ -14,7 +14,7 @@ use ffi::CString;
 use io::{self, Error, ErrorKind};
 use libc::{self, c_int, c_char, c_void, socklen_t};
 use mem;
-use net::{SocketAddr, Shutdown};
+use net::{SocketAddr, Shutdown, IpAddr};
 use sys::c;
 use sys::net::{cvt, cvt_r, cvt_gai, Socket, init, wrlen_t};
 use sys_common::{AsInner, FromInner, IntoInner};
@@ -334,39 +334,39 @@ impl UdpSocket {
                    libc::IP_MULTICAST_LOOP, on as c_int)
     }
 
-    pub fn join_multicast(&self, multi: &SocketAddr) -> io::Result<()> {
+    pub fn join_multicast(&self, multi: &IpAddr) -> io::Result<()> {
         match *multi {
-            SocketAddr::V4(..) => {
+            IpAddr::V4(..) => {
                 self.set_membership(multi, libc::IP_ADD_MEMBERSHIP)
             }
-            SocketAddr::V6(..) => {
+            IpAddr::V6(..) => {
                 self.set_membership(multi, libc::IPV6_ADD_MEMBERSHIP)
             }
         }
     }
-    pub fn leave_multicast(&self, multi: &SocketAddr) -> io::Result<()> {
+    pub fn leave_multicast(&self, multi: &IpAddr) -> io::Result<()> {
         match *multi {
-            SocketAddr::V4(..) => {
+            IpAddr::V4(..) => {
                 self.set_membership(multi, libc::IP_DROP_MEMBERSHIP)
             }
-            SocketAddr::V6(..) => {
+            IpAddr::V6(..) => {
                 self.set_membership(multi, libc::IPV6_DROP_MEMBERSHIP)
             }
         }
     }
-    fn set_membership(&self, addr: &SocketAddr, opt: c_int) -> io::Result<()> {
+    fn set_membership(&self, addr: &IpAddr, opt: c_int) -> io::Result<()> {
         match *addr {
-            SocketAddr::V4(ref addr) => {
+            IpAddr::V4(ref addr) => {
                 let mreq = libc::ip_mreq {
-                    imr_multiaddr: *addr.ip().as_inner(),
+                    imr_multiaddr: *addr.as_inner(),
                     // interface == INADDR_ANY
                     imr_interface: libc::in_addr { s_addr: 0x0 },
                 };
                 setsockopt(&self.inner, libc::IPPROTO_IP, opt, mreq)
             }
-            SocketAddr::V6(ref addr) => {
+            IpAddr::V6(ref addr) => {
                 let mreq = libc::ip6_mreq {
-                    ipv6mr_multiaddr: *addr.ip().as_inner(),
+                    ipv6mr_multiaddr: *addr.as_inner(),
                     ipv6mr_interface: 0,
                 };
                 setsockopt(&self.inner, libc::IPPROTO_IPV6, opt, mreq)