IP address convenience constructors

src/libstd/net/ip.rs

@@ -342,6 +342,32 @@ impl Ipv4Addr {
         }
     }
 
+    /// Creates a new IPv4 address with the address pointing to localhost: 127.0.0.1.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// let addr = Ipv4Addr::localhost();
+    /// assert_eq!(addr, Ipv4Addr::new(127, 0, 0, 1));
+    pub fn localhost() -> Ipv4Addr {
+        Ipv4Addr::new(127, 0, 0, 1)
+    }
+
+    /// Creates a new IPv4 address representing an unspecified address: 0.0.0.0
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv4Addr;
+    ///
+    /// let addr = Ipv4Addr::unspecified();
+    /// assert_eq!(addr, Ipv4Addr::new(0, 0, 0, 0));
+    pub fn unspecified() -> Ipv4Addr {
+        Ipv4Addr::new(0, 0, 0, 0)
+    }
+
     /// Returns the four eight-bit integers that make up this address.
     ///
     /// # Examples
@@ -788,6 +814,32 @@ impl Ipv6Addr {
         Ipv6Addr { inner: addr }
     }
 
+    /// Creates a new IPv6 address representing localhost: `::1`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// let addr = Ipv6Addr::localhost();
+    /// assert_eq!(addr, Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1));
+    pub fn localhost() -> Ipv6Addr {
+        Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1)
+    }
+
+    /// Creates a new IPv6 address representing the unspecified address: `::`
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::net::Ipv6Addr;
+    ///
+    /// let addr = Ipv6Addr::unspecified();
+    /// assert_eq!(addr, Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0));
+    pub fn unspecified() -> Ipv6Addr {
+        Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0)
+    }
+
     /// Returns the eight 16-bit segments that make up this address.
     ///
     /// # Examples
@@ -1681,6 +1733,22 @@ mod tests {
         assert_eq!(Ipv6Addr::from(0x112233445566778899aabbccddeeff11u128), a);
     }
 
+    #[test]
+    fn ipv4_from_constructors() {
+        assert_eq!(Ipv4Addr::localhost(), Ipv4Addr::new(127, 0, 0, 1));
+        assert!(Ipv4Addr::localhost().is_loopback());
+        assert_eq!(Ipv4Addr::unspecified(), Ipv4Addr::new(0, 0, 0, 0));
+        assert!(Ipv4Addr::unspecified().is_unspecified());
+    }
+
+    #[test]
+    fn ipv6_from_contructors() {
+        assert_eq!(Ipv6Addr::localhost(), Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1));
+        assert!(Ipv6Addr::localhost().is_loopback());
+        assert_eq!(Ipv6Addr::unspecified(), Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0));
+        assert!(Ipv6Addr::unspecified().is_unspecified());
+    }
+        
     #[test]
     fn ipv4_from_octets() {
         assert_eq!(Ipv4Addr::from([127, 0, 0, 1]), Ipv4Addr::new(127, 0, 0, 1))