diff options
| -rw-r--r-- | library/core/src/net/ip_addr.rs | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/library/core/src/net/ip_addr.rs b/library/core/src/net/ip_addr.rs index 3e036b88128..6dc8018d80d 100644 --- a/library/core/src/net/ip_addr.rs +++ b/library/core/src/net/ip_addr.rs @@ -1,6 +1,7 @@ use super::display_buffer::DisplayBuffer; use crate::cmp::Ordering; use crate::fmt::{self, Write}; +use crate::hash::{Hash, Hasher}; use crate::iter; use crate::mem::transmute; use crate::ops::{BitAnd, BitAndAssign, BitOr, BitOrAssign, Not}; @@ -67,12 +68,20 @@ pub enum IpAddr { /// assert!("0000000.0.0.0".parse::<Ipv4Addr>().is_err()); // first octet is a zero in octal /// assert!("0xcb.0x0.0x71.0x00".parse::<Ipv4Addr>().is_err()); // all octets are in hex /// ``` -#[derive(Copy, Clone, PartialEq, Eq, Hash)] +#[derive(Copy, Clone, PartialEq, Eq)] #[stable(feature = "rust1", since = "1.0.0")] pub struct Ipv4Addr { octets: [u8; 4], } +impl Hash for Ipv4Addr { + fn hash<H: Hasher>(&self, state: &mut H) { + // Hashers are often more efficient at hashing a fixed-width integer + // than a bytestring, so convert before hashing. + u32::from_le_bytes(self.octets).hash(state); + } +} + /// An IPv6 address. /// /// IPv6 addresses are defined as 128-bit integers in [IETF RFC 4291]. @@ -149,12 +158,20 @@ pub struct Ipv4Addr { /// assert_eq!("::1".parse(), Ok(localhost)); /// assert_eq!(localhost.is_loopback(), true); /// ``` -#[derive(Copy, Clone, PartialEq, Eq, Hash)] +#[derive(Copy, Clone, PartialEq, Eq)] #[stable(feature = "rust1", since = "1.0.0")] pub struct Ipv6Addr { octets: [u8; 16], } +impl Hash for Ipv6Addr { + fn hash<H: Hasher>(&self, state: &mut H) { + // Hashers are often more efficient at hashing a fixed-width integer + // than a bytestring, so convert before hashing. + u128::from_le_bytes(self.octets).hash(state); + } +} + /// Scope of an [IPv6 multicast address] as defined in [IETF RFC 7346 section 2]. /// /// # Stability Guarantees |