added Eq and TotalEq instances for IpAddr

Author: Eric Reed

src/libstd/rt/io/net/ip.rs

@@ -8,7 +8,28 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+use std::cmp::{Eq, TotalEq, eq};
+
 pub enum IpAddr {
     Ipv4(u8, u8, u8, u8, u16),
     Ipv6
 }
+
+impl Eq for IpAddr {
+    fn eq(&self, other: &IpAddr) -> bool {
+        match (*self, *other) {
+            (Ipv4(a,b,c,d,e), Ipv4(f,g,h,i,j)) => a == f && b == g && c == h && d == i && e == j,
+            (Ipv6, Ipv6) => fail!(), 
+            _ => false
+        }
+    }
+    fn ne(&self, other: &IpAddr) -> bool {
+        !eq(self, other)
+    }
+}
+
+impl TotalEq for IpAddr {
+    fn equals(&self, other: &IpAddr) -> bool {
+        *self == *other
+    }
+}