vendor/rustix-0.38.19/src/maybe_polyfill/no_std/net/socket_addr.rs - toolchain/rustc - Git at Google

 //! The following is derived from Rust's
 //! library/std/src/net/socket_addr.rs at revision
 //! bd20fc1fd657b32f7aa1d70d8723f04c87f21606.
 //!
 //! All code in this file is licensed MIT or Apache 2.0 at your option.
 //!
 //! This defines `SocketAddr`, `SocketAddrV4`, and `SocketAddrV6` in a
 //! platform-independent way. It is not the native representation.

 use super::ip_addr::{IpAddr, Ipv4Addr, Ipv6Addr};
 use core::cmp::Ordering;
 use core::hash;

 /// An internet socket address, either IPv4 or IPv6.
 ///
 /// Internet socket addresses consist of an [IP address], a 16-bit port number, as well
 /// as possibly some version-dependent additional information. See [`SocketAddrV4`]'s and
 /// [`SocketAddrV6`]'s respective documentation for more details.
 ///
 /// The size of a `SocketAddr` instance may vary depending on the target operating
 /// system.
 ///
 /// [IP address]: IpAddr
 ///
 /// # Examples
 ///
 /// ```
 /// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
 ///
 /// let socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
 ///
 /// assert_eq!("127.0.0.1:8080".parse(), Ok(socket));
 /// assert_eq!(socket.port(), 8080);
 /// assert_eq!(socket.is_ipv4(), true);
 /// ```
 #[derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]
 #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
 pub enum SocketAddr {
     /// An IPv4 socket address.
     #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
     V4(#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))] SocketAddrV4),
     /// An IPv6 socket address.
     #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
     V6(#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))] SocketAddrV6),
 }

 /// An IPv4 socket address.
 ///
 /// IPv4 socket addresses consist of an [`IPv4` address] and a 16-bit port number, as
 /// stated in [IETF RFC 793].
 ///
 /// See [`SocketAddr`] for a type encompassing both IPv4 and IPv6 socket addresses.
 ///
 /// The size of a `SocketAddrV4` struct may vary depending on the target operating
 /// system. Do not assume that this type has the same memory layout as the underlying
 /// system representation.
 ///
 /// [IETF RFC 793]: https://tools.ietf.org/html/rfc793
 /// [`IPv4` address]: Ipv4Addr
 ///
 /// # Examples
 ///
 /// ```
 /// use std::net::{Ipv4Addr, SocketAddrV4};
 ///
 /// let socket = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080);
 ///
 /// assert_eq!("127.0.0.1:8080".parse(), Ok(socket));
 /// assert_eq!(socket.ip(), &Ipv4Addr::new(127, 0, 0, 1));
 /// assert_eq!(socket.port(), 8080);
 /// ```
 #[derive(Copy, Clone, Eq, PartialEq)]
 #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
 pub struct SocketAddrV4 {
     ip: Ipv4Addr,
     port: u16,
 }

 /// An IPv6 socket address.
 ///
 /// IPv6 socket addresses consist of an [`IPv6` address], a 16-bit port number, as well
 /// as fields containing the traffic class, the flow label, and a scope identifier
 /// (see [IETF RFC 2553, Section 3.3] for more details).
 ///
 /// See [`SocketAddr`] for a type encompassing both IPv4 and IPv6 socket addresses.
 ///
 /// The size of a `SocketAddrV6` struct may vary depending on the target operating
 /// system. Do not assume that this type has the same memory layout as the underlying
 /// system representation.
 ///
 /// [IETF RFC 2553, Section 3.3]: https://tools.ietf.org/html/rfc2553#section-3.3
 /// [`IPv6` address]: Ipv6Addr
 ///
 /// # Examples
 ///
 /// ```
 /// use std::net::{Ipv6Addr, SocketAddrV6};
 ///
 /// let socket = SocketAddrV6::new(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 1), 8080, 0, 0);
 ///
 /// assert_eq!("[2001:db8::1]:8080".parse(), Ok(socket));
 /// assert_eq!(socket.ip(), &Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 1));
 /// assert_eq!(socket.port(), 8080);
 /// ```
 #[derive(Copy, Clone, Eq, PartialEq)]
 #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
 pub struct SocketAddrV6 {
     ip: Ipv6Addr,
     port: u16,
     flowinfo: u32,
     scope_id: u32,
 }

 impl SocketAddr {
     /// Creates a new socket address from an [IP address] and a port number.
     ///
     /// [IP address]: IpAddr
     ///
     /// # Examples
     ///
     /// ```
     /// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
     ///
     /// let socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
     /// assert_eq!(socket.ip(), IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)));
     /// assert_eq!(socket.port(), 8080);
     /// ```
     #[cfg_attr(staged_api, stable(feature = "ip_addr", since = "1.7.0"))]
     #[must_use]
     #[cfg_attr(
         staged_api,
         rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
     )]
     pub const fn new(ip: IpAddr, port: u16) -> SocketAddr {
         match ip {
             IpAddr::V4(a) => SocketAddr::V4(SocketAddrV4::new(a, port)),
             IpAddr::V6(a) => SocketAddr::V6(SocketAddrV6::new(a, port, 0, 0)),
         }
     }

     /// Returns the IP address associated with this socket address.
     ///
     /// # Examples
     ///
     /// ```
     /// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
     ///
     /// let socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
     /// assert_eq!(socket.ip(), IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)));
     /// ```
     #[must_use]
     #[cfg_attr(staged_api, stable(feature = "ip_addr", since = "1.7.0"))]
     #[cfg_attr(
         staged_api,
         rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
     )]
     pub const fn ip(&self) -> IpAddr {
         match *self {
             SocketAddr::V4(ref a) => IpAddr::V4(*a.ip()),
             SocketAddr::V6(ref a) => IpAddr::V6(*a.ip()),
         }
     }

     /// Changes the IP address associated with this socket address.
     ///
     /// # Examples
     ///
     /// ```
     /// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
     ///
     /// let mut socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
     /// socket.set_ip(IpAddr::V4(Ipv4Addr::new(10, 10, 0, 1)));
     /// assert_eq!(socket.ip(), IpAddr::V4(Ipv4Addr::new(10, 10, 0, 1)));
     /// ```
     #[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
     pub fn set_ip(&mut self, new_ip: IpAddr) {
         // `match (*self, new_ip)` would have us mutate a copy of self only to throw it away.
         match (self, new_ip) {
             (&mut SocketAddr::V4(ref mut a), IpAddr::V4(new_ip)) => a.set_ip(new_ip),
             (&mut SocketAddr::V6(ref mut a), IpAddr::V6(new_ip)) => a.set_ip(new_ip),
             (self_, new_ip) => *self_ = Self::new(new_ip, self_.port()),
         }
     }

     /// Returns the port number associated with this socket address.
     ///
     /// # Examples
     ///
     /// ```
     /// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
     ///
     /// let socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
     /// assert_eq!(socket.port(), 8080);
     /// ```
     #[must_use]
     #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
     #[cfg_attr(
         staged_api,
         rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
     )]
     pub const fn port(&self) -> u16 {
         match *self {
             SocketAddr::V4(ref a) => a.port(),
             SocketAddr::V6(ref a) => a.port(),
         }
     }

     /// Changes the port number associated with this socket address.
     ///
     /// # Examples
     ///
     /// ```
     /// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
     ///
     /// let mut socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
     /// socket.set_port(1025);
     /// assert_eq!(socket.port(), 1025);
     /// ```
     #[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
     pub fn set_port(&mut self, new_port: u16) {
         match *self {
             SocketAddr::V4(ref mut a) => a.set_port(new_port),
             SocketAddr::V6(ref mut a) => a.set_port(new_port),
         }
     }

     /// Returns [`true`] if the [IP address] in this `SocketAddr` is an
     /// [`IPv4` address], and [`false`] otherwise.
     ///
     /// [IP address]: IpAddr
     /// [`IPv4` address]: IpAddr::V4
     ///
     /// # Examples
     ///
     /// ```
     /// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
     ///
     /// let socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
     /// assert_eq!(socket.is_ipv4(), true);
     /// assert_eq!(socket.is_ipv6(), false);
     /// ```
     #[must_use]
     #[cfg_attr(staged_api, stable(feature = "sockaddr_checker", since = "1.16.0"))]
     #[cfg_attr(
         staged_api,
         rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
     )]
     pub const fn is_ipv4(&self) -> bool {
         matches!(*self, SocketAddr::V4(_))
     }

     /// Returns [`true`] if the [IP address] in this `SocketAddr` is an
     /// [`IPv6` address], and [`false`] otherwise.
     ///
     /// [IP address]: IpAddr
     /// [`IPv6` address]: IpAddr::V6
     ///
     /// # Examples
     ///
     /// ```
     /// use std::net::{IpAddr, Ipv6Addr, SocketAddr};
     ///
     /// let socket = SocketAddr::new(IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 65535, 0, 1)), 8080);
     /// assert_eq!(socket.is_ipv4(), false);
     /// assert_eq!(socket.is_ipv6(), true);
     /// ```
     #[must_use]
     #[cfg_attr(staged_api, stable(feature = "sockaddr_checker", since = "1.16.0"))]
     #[cfg_attr(
         staged_api,
         rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
     )]
     pub const fn is_ipv6(&self) -> bool {
         matches!(*self, SocketAddr::V6(_))
     }
 }

 impl SocketAddrV4 {
     /// Creates a new socket address from an [`IPv4` address] and a port number.
     ///
     /// [`IPv4` address]: Ipv4Addr
     ///
     /// # Examples
     ///
     /// ```
     /// use std::net::{SocketAddrV4, Ipv4Addr};
     ///
     /// let socket = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080);
     /// ```
     #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
     #[must_use]
     #[cfg_attr(
         staged_api,
         rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
     )]
     pub const fn new(ip: Ipv4Addr, port: u16) -> SocketAddrV4 {
         SocketAddrV4 { ip, port }
     }

     /// Returns the IP address associated with this socket address.
     ///
     /// # Examples
     ///
     /// ```
     /// use std::net::{SocketAddrV4, Ipv4Addr};
     ///
     /// let socket = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080);
     /// assert_eq!(socket.ip(), &Ipv4Addr::new(127, 0, 0, 1));
     /// ```
     #[must_use]
     #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
     #[cfg_attr(
         staged_api,
         rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
     )]
     pub const fn ip(&self) -> &Ipv4Addr {
         &self.ip
     }

     /// Changes the IP address associated with this socket address.
     ///
     /// # Examples
     ///
     /// ```
     /// use std::net::{SocketAddrV4, Ipv4Addr};
     ///
     /// let mut socket = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080);
     /// socket.set_ip(Ipv4Addr::new(192, 168, 0, 1));
     /// assert_eq!(socket.ip(), &Ipv4Addr::new(192, 168, 0, 1));
     /// ```
     #[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
     pub fn set_ip(&mut self, new_ip: Ipv4Addr) {
         self.ip = new_ip;
     }

     /// Returns the port number associated with this socket address.
     ///
     /// # Examples
     ///
     /// ```
     /// use std::net::{SocketAddrV4, Ipv4Addr};
     ///
     /// let socket = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080);
     /// assert_eq!(socket.port(), 8080);
     /// ```
     #[must_use]
     #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
     #[cfg_attr(
         staged_api,
         rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
     )]
     pub const fn port(&self) -> u16 {
         self.port
     }

     /// Changes the port number associated with this socket address.
     ///
     /// # Examples
     ///
     /// ```
     /// use std::net::{SocketAddrV4, Ipv4Addr};
     ///
     /// let mut socket = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080);
     /// socket.set_port(4242);
     /// assert_eq!(socket.port(), 4242);
     /// ```
     #[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
     pub fn set_port(&mut self, new_port: u16) {
         self.port = new_port;
     }
 }

 impl SocketAddrV6 {
     /// Creates a new socket address from an [`IPv6` address], a 16-bit port number,
     /// and the `flowinfo` and `scope_id` fields.
     ///
     /// For more information on the meaning and layout of the `flowinfo` and `scope_id`
     /// parameters, see [IETF RFC 2553, Section 3.3].
     ///
     /// [IETF RFC 2553, Section 3.3]: https://tools.ietf.org/html/rfc2553#section-3.3
     /// [`IPv6` address]: Ipv6Addr
     ///
     /// # Examples
     ///
     /// ```
     /// use std::net::{SocketAddrV6, Ipv6Addr};
     ///
     /// let socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 0);
     /// ```
     #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
     #[must_use]
     #[cfg_attr(
         staged_api,
         rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
     )]
     pub const fn new(ip: Ipv6Addr, port: u16, flowinfo: u32, scope_id: u32) -> SocketAddrV6 {
         SocketAddrV6 {
             ip,
             port,
             flowinfo,
             scope_id,
         }
     }

     /// Returns the IP address associated with this socket address.
     ///
     /// # Examples
     ///
     /// ```
     /// use std::net::{SocketAddrV6, Ipv6Addr};
     ///
     /// let socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 0);
     /// assert_eq!(socket.ip(), &Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1));
     /// ```
     #[must_use]
     #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
     #[cfg_attr(
         staged_api,
         rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
     )]
     pub const fn ip(&self) -> &Ipv6Addr {
         &self.ip
     }

     /// Changes the IP address associated with this socket address.
     ///
     /// # Examples
     ///
     /// ```
     /// use std::net::{SocketAddrV6, Ipv6Addr};
     ///
     /// let mut socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 0);
     /// socket.set_ip(Ipv6Addr::new(76, 45, 0, 0, 0, 0, 0, 0));
     /// assert_eq!(socket.ip(), &Ipv6Addr::new(76, 45, 0, 0, 0, 0, 0, 0));
     /// ```
     #[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
     pub fn set_ip(&mut self, new_ip: Ipv6Addr) {
         self.ip = new_ip;
     }

     /// Returns the port number associated with this socket address.
     ///
     /// # Examples
     ///
     /// ```
     /// use std::net::{SocketAddrV6, Ipv6Addr};
     ///
     /// let socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 0);
     /// assert_eq!(socket.port(), 8080);
     /// ```
     #[must_use]
     #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
     #[cfg_attr(
         staged_api,
         rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
     )]
     pub const fn port(&self) -> u16 {
         self.port
     }

     /// Changes the port number associated with this socket address.
     ///
     /// # Examples
     ///
     /// ```
     /// use std::net::{SocketAddrV6, Ipv6Addr};
     ///
     /// let mut socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 0);
     /// socket.set_port(4242);
     /// assert_eq!(socket.port(), 4242);
     /// ```
     #[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
     pub fn set_port(&mut self, new_port: u16) {
         self.port = new_port;
     }

     /// Returns the flow information associated with this address.
     ///
     /// This information corresponds to the `sin6_flowinfo` field in C's `netinet/in.h`,
     /// as specified in [IETF RFC 2553, Section 3.3].
     /// It combines information about the flow label and the traffic class as specified
     /// in [IETF RFC 2460], respectively [Section 6] and [Section 7].
     ///
     /// [IETF RFC 2553, Section 3.3]: https://tools.ietf.org/html/rfc2553#section-3.3
     /// [IETF RFC 2460]: https://tools.ietf.org/html/rfc2460
     /// [Section 6]: https://tools.ietf.org/html/rfc2460#section-6
     /// [Section 7]: https://tools.ietf.org/html/rfc2460#section-7
     ///
     /// # Examples
     ///
     /// ```
     /// use std::net::{SocketAddrV6, Ipv6Addr};
     ///
     /// let socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 10, 0);
     /// assert_eq!(socket.flowinfo(), 10);
     /// ```
     #[must_use]
     #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
     #[cfg_attr(
         staged_api,
         rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
     )]
     pub const fn flowinfo(&self) -> u32 {
         self.flowinfo
     }

     /// Changes the flow information associated with this socket address.
     ///
     /// See [`SocketAddrV6::flowinfo`]'s documentation for more details.
     ///
     /// # Examples
     ///
     /// ```
     /// use std::net::{SocketAddrV6, Ipv6Addr};
     ///
     /// let mut socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 10, 0);
     /// socket.set_flowinfo(56);
     /// assert_eq!(socket.flowinfo(), 56);
     /// ```
     #[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
     pub fn set_flowinfo(&mut self, new_flowinfo: u32) {
         self.flowinfo = new_flowinfo;
     }

     /// Returns the scope ID associated with this address.
     ///
     /// This information corresponds to the `sin6_scope_id` field in C's `netinet/in.h`,
     /// as specified in [IETF RFC 2553, Section 3.3].
     ///
     /// [IETF RFC 2553, Section 3.3]: https://tools.ietf.org/html/rfc2553#section-3.3
     ///
     /// # Examples
     ///
     /// ```
     /// use std::net::{SocketAddrV6, Ipv6Addr};
     ///
     /// let socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 78);
     /// assert_eq!(socket.scope_id(), 78);
     /// ```
     #[must_use]
     #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
     #[cfg_attr(
         staged_api,
         rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
     )]
     pub const fn scope_id(&self) -> u32 {
         self.scope_id
     }

     /// Changes the scope ID associated with this socket address.
     ///
     /// See [`SocketAddrV6::scope_id`]'s documentation for more details.
     ///
     /// # Examples
     ///
     /// ```
     /// use std::net::{SocketAddrV6, Ipv6Addr};
     ///
     /// let mut socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 78);
     /// socket.set_scope_id(42);
     /// assert_eq!(socket.scope_id(), 42);
     /// ```
     #[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
     pub fn set_scope_id(&mut self, new_scope_id: u32) {
         self.scope_id = new_scope_id;
     }
 }

 #[cfg_attr(staged_api, stable(feature = "ip_from_ip", since = "1.16.0"))]
 impl From<SocketAddrV4> for SocketAddr {
     /// Converts a [`SocketAddrV4`] into a [`SocketAddr::V4`].
     fn from(sock4: SocketAddrV4) -> SocketAddr {
         SocketAddr::V4(sock4)
     }
 }

 #[cfg_attr(staged_api, stable(feature = "ip_from_ip", since = "1.16.0"))]
 impl From<SocketAddrV6> for SocketAddr {
     /// Converts a [`SocketAddrV6`] into a [`SocketAddr::V6`].
     fn from(sock6: SocketAddrV6) -> SocketAddr {
         SocketAddr::V6(sock6)
     }
 }

 #[cfg_attr(staged_api, stable(feature = "addr_from_into_ip", since = "1.17.0"))]
 impl<I: Into<IpAddr>> From<(I, u16)> for SocketAddr {
     /// Converts a tuple struct (Into<[`IpAddr`]>, `u16`) into a [`SocketAddr`].
     ///
     /// This conversion creates a [`SocketAddr::V4`] for an [`IpAddr::V4`]
     /// and creates a [`SocketAddr::V6`] for an [`IpAddr::V6`].
     ///
     /// `u16` is treated as port of the newly created [`SocketAddr`].
     fn from(pieces: (I, u16)) -> SocketAddr {
         SocketAddr::new(pieces.0.into(), pieces.1)
     }
 }

 #[cfg_attr(staged_api, stable(feature = "socketaddr_ordering", since = "1.45.0"))]
 impl PartialOrd for SocketAddrV4 {
     fn partial_cmp(&self, other: &SocketAddrV4) -> Option<Ordering> {
         Some(self.cmp(other))
     }
 }

 #[cfg_attr(staged_api, stable(feature = "socketaddr_ordering", since = "1.45.0"))]
 impl PartialOrd for SocketAddrV6 {
     fn partial_cmp(&self, other: &SocketAddrV6) -> Option<Ordering> {
         Some(self.cmp(other))
     }
 }

 #[cfg_attr(staged_api, stable(feature = "socketaddr_ordering", since = "1.45.0"))]
 impl Ord for SocketAddrV4 {
     fn cmp(&self, other: &SocketAddrV4) -> Ordering {
         self.ip()
             .cmp(other.ip())
             .then(self.port().cmp(&other.port()))
     }
 }

 #[cfg_attr(staged_api, stable(feature = "socketaddr_ordering", since = "1.45.0"))]
 impl Ord for SocketAddrV6 {
     fn cmp(&self, other: &SocketAddrV6) -> Ordering {
         self.ip()
             .cmp(other.ip())
             .then(self.port().cmp(&other.port()))
     }
 }

 #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
 impl hash::Hash for SocketAddrV4 {
     fn hash<H: hash::Hasher>(&self, s: &mut H) {
         (self.port, self.ip).hash(s)
     }
 }
 #[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
 impl hash::Hash for SocketAddrV6 {
     fn hash<H: hash::Hasher>(&self, s: &mut H) {
         (self.port, &self.ip, self.flowinfo, self.scope_id).hash(s)
     }
 }
	//! The following is derived from Rust's
	//! library/std/src/net/socket_addr.rs at revision
	//! bd20fc1fd657b32f7aa1d70d8723f04c87f21606.
	//!
	//! All code in this file is licensed MIT or Apache 2.0 at your option.
	//!
	//! This defines `SocketAddr`, `SocketAddrV4`, and `SocketAddrV6` in a
	//! platform-independent way. It is not the native representation.

	use super::ip_addr::{IpAddr, Ipv4Addr, Ipv6Addr};
	use core::cmp::Ordering;
	use core::hash;

	/// An internet socket address, either IPv4 or IPv6.
	///
	/// Internet socket addresses consist of an [IP address], a 16-bit port number, as well
	/// as possibly some version-dependent additional information. See [`SocketAddrV4`]'s and
	/// [`SocketAddrV6`]'s respective documentation for more details.
	///
	/// The size of a `SocketAddr` instance may vary depending on the target operating
	/// system.
	///
	/// [IP address]: IpAddr
	///
	/// # Examples
	///
	/// ```
	/// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
	///
	/// let socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
	///
	/// assert_eq!("127.0.0.1:8080".parse(), Ok(socket));
	/// assert_eq!(socket.port(), 8080);
	/// assert_eq!(socket.is_ipv4(), true);
	/// ```
	#[derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]
	#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
	pub enum SocketAddr {
	/// An IPv4 socket address.
	#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
	V4(#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))] SocketAddrV4),
	/// An IPv6 socket address.
	#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
	V6(#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))] SocketAddrV6),
	}

	/// An IPv4 socket address.
	///
	/// IPv4 socket addresses consist of an [`IPv4` address] and a 16-bit port number, as
	/// stated in [IETF RFC 793].
	///
	/// See [`SocketAddr`] for a type encompassing both IPv4 and IPv6 socket addresses.
	///
	/// The size of a `SocketAddrV4` struct may vary depending on the target operating
	/// system. Do not assume that this type has the same memory layout as the underlying
	/// system representation.
	///
	/// [IETF RFC 793]: https://tools.ietf.org/html/rfc793
	/// [`IPv4` address]: Ipv4Addr
	///
	/// # Examples
	///
	/// ```
	/// use std::net::{Ipv4Addr, SocketAddrV4};
	///
	/// let socket = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080);
	///
	/// assert_eq!("127.0.0.1:8080".parse(), Ok(socket));
	/// assert_eq!(socket.ip(), &Ipv4Addr::new(127, 0, 0, 1));
	/// assert_eq!(socket.port(), 8080);
	/// ```
	#[derive(Copy, Clone, Eq, PartialEq)]
	#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
	pub struct SocketAddrV4 {
	ip: Ipv4Addr,
	port: u16,
	}

	/// An IPv6 socket address.
	///
	/// IPv6 socket addresses consist of an [`IPv6` address], a 16-bit port number, as well
	/// as fields containing the traffic class, the flow label, and a scope identifier
	/// (see [IETF RFC 2553, Section 3.3] for more details).
	///
	/// See [`SocketAddr`] for a type encompassing both IPv4 and IPv6 socket addresses.
	///
	/// The size of a `SocketAddrV6` struct may vary depending on the target operating
	/// system. Do not assume that this type has the same memory layout as the underlying
	/// system representation.
	///
	/// [IETF RFC 2553, Section 3.3]: https://tools.ietf.org/html/rfc2553#section-3.3
	/// [`IPv6` address]: Ipv6Addr
	///
	/// # Examples
	///
	/// ```
	/// use std::net::{Ipv6Addr, SocketAddrV6};
	///
	/// let socket = SocketAddrV6::new(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 1), 8080, 0, 0);
	///
	/// assert_eq!("[2001:db8::1]:8080".parse(), Ok(socket));
	/// assert_eq!(socket.ip(), &Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 1));
	/// assert_eq!(socket.port(), 8080);
	/// ```
	#[derive(Copy, Clone, Eq, PartialEq)]
	#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
	pub struct SocketAddrV6 {
	ip: Ipv6Addr,
	port: u16,
	flowinfo: u32,
	scope_id: u32,
	}

	impl SocketAddr {
	/// Creates a new socket address from an [IP address] and a port number.
	///
	/// [IP address]: IpAddr
	///
	/// # Examples
	///
	/// ```
	/// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
	///
	/// let socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
	/// assert_eq!(socket.ip(), IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)));
	/// assert_eq!(socket.port(), 8080);
	/// ```
	#[cfg_attr(staged_api, stable(feature = "ip_addr", since = "1.7.0"))]
	#[must_use]
	#[cfg_attr(
	staged_api,
	rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
	)]
	pub const fn new(ip: IpAddr, port: u16) -> SocketAddr {
	match ip {
	IpAddr::V4(a) => SocketAddr::V4(SocketAddrV4::new(a, port)),
	IpAddr::V6(a) => SocketAddr::V6(SocketAddrV6::new(a, port, 0, 0)),
	}
	}

	/// Returns the IP address associated with this socket address.
	///
	/// # Examples
	///
	/// ```
	/// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
	///
	/// let socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
	/// assert_eq!(socket.ip(), IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)));
	/// ```
	#[must_use]
	#[cfg_attr(staged_api, stable(feature = "ip_addr", since = "1.7.0"))]
	#[cfg_attr(
	staged_api,
	rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
	)]
	pub const fn ip(&self) -> IpAddr {
	match *self {
	SocketAddr::V4(ref a) => IpAddr::V4(*a.ip()),
	SocketAddr::V6(ref a) => IpAddr::V6(*a.ip()),
	}
	}

	/// Changes the IP address associated with this socket address.
	///
	/// # Examples
	///
	/// ```
	/// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
	///
	/// let mut socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
	/// socket.set_ip(IpAddr::V4(Ipv4Addr::new(10, 10, 0, 1)));
	/// assert_eq!(socket.ip(), IpAddr::V4(Ipv4Addr::new(10, 10, 0, 1)));
	/// ```
	#[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
	pub fn set_ip(&mut self, new_ip: IpAddr) {
	// `match (*self, new_ip)` would have us mutate a copy of self only to throw it away.
	match (self, new_ip) {
	(&mut SocketAddr::V4(ref mut a), IpAddr::V4(new_ip)) => a.set_ip(new_ip),
	(&mut SocketAddr::V6(ref mut a), IpAddr::V6(new_ip)) => a.set_ip(new_ip),
	(self_, new_ip) => *self_ = Self::new(new_ip, self_.port()),
	}
	}

	/// Returns the port number associated with this socket address.
	///
	/// # Examples
	///
	/// ```
	/// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
	///
	/// let socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
	/// assert_eq!(socket.port(), 8080);
	/// ```
	#[must_use]
	#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
	#[cfg_attr(
	staged_api,
	rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
	)]
	pub const fn port(&self) -> u16 {
	match *self {
	SocketAddr::V4(ref a) => a.port(),
	SocketAddr::V6(ref a) => a.port(),
	}
	}

	/// Changes the port number associated with this socket address.
	///
	/// # Examples
	///
	/// ```
	/// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
	///
	/// let mut socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
	/// socket.set_port(1025);
	/// assert_eq!(socket.port(), 1025);
	/// ```
	#[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
	pub fn set_port(&mut self, new_port: u16) {
	match *self {
	SocketAddr::V4(ref mut a) => a.set_port(new_port),
	SocketAddr::V6(ref mut a) => a.set_port(new_port),
	}
	}

	/// Returns [`true`] if the [IP address] in this `SocketAddr` is an
	/// [`IPv4` address], and [`false`] otherwise.
	///
	/// [IP address]: IpAddr
	/// [`IPv4` address]: IpAddr::V4
	///
	/// # Examples
	///
	/// ```
	/// use std::net::{IpAddr, Ipv4Addr, SocketAddr};
	///
	/// let socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
	/// assert_eq!(socket.is_ipv4(), true);
	/// assert_eq!(socket.is_ipv6(), false);
	/// ```
	#[must_use]
	#[cfg_attr(staged_api, stable(feature = "sockaddr_checker", since = "1.16.0"))]
	#[cfg_attr(
	staged_api,
	rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
	)]
	pub const fn is_ipv4(&self) -> bool {
	matches!(*self, SocketAddr::V4(_))
	}

	/// Returns [`true`] if the [IP address] in this `SocketAddr` is an
	/// [`IPv6` address], and [`false`] otherwise.
	///
	/// [IP address]: IpAddr
	/// [`IPv6` address]: IpAddr::V6
	///
	/// # Examples
	///
	/// ```
	/// use std::net::{IpAddr, Ipv6Addr, SocketAddr};
	///
	/// let socket = SocketAddr::new(IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 65535, 0, 1)), 8080);
	/// assert_eq!(socket.is_ipv4(), false);
	/// assert_eq!(socket.is_ipv6(), true);
	/// ```
	#[must_use]
	#[cfg_attr(staged_api, stable(feature = "sockaddr_checker", since = "1.16.0"))]
	#[cfg_attr(
	staged_api,
	rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
	)]
	pub const fn is_ipv6(&self) -> bool {
	matches!(*self, SocketAddr::V6(_))
	}
	}

	impl SocketAddrV4 {
	/// Creates a new socket address from an [`IPv4` address] and a port number.
	///
	/// [`IPv4` address]: Ipv4Addr
	///
	/// # Examples
	///
	/// ```
	/// use std::net::{SocketAddrV4, Ipv4Addr};
	///
	/// let socket = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080);
	/// ```
	#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
	#[must_use]
	#[cfg_attr(
	staged_api,
	rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
	)]
	pub const fn new(ip: Ipv4Addr, port: u16) -> SocketAddrV4 {
	SocketAddrV4 { ip, port }
	}

	/// Returns the IP address associated with this socket address.
	///
	/// # Examples
	///
	/// ```
	/// use std::net::{SocketAddrV4, Ipv4Addr};
	///
	/// let socket = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080);
	/// assert_eq!(socket.ip(), &Ipv4Addr::new(127, 0, 0, 1));
	/// ```
	#[must_use]
	#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
	#[cfg_attr(
	staged_api,
	rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
	)]
	pub const fn ip(&self) -> &Ipv4Addr {
	&self.ip
	}

	/// Changes the IP address associated with this socket address.
	///
	/// # Examples
	///
	/// ```
	/// use std::net::{SocketAddrV4, Ipv4Addr};
	///
	/// let mut socket = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080);
	/// socket.set_ip(Ipv4Addr::new(192, 168, 0, 1));
	/// assert_eq!(socket.ip(), &Ipv4Addr::new(192, 168, 0, 1));
	/// ```
	#[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
	pub fn set_ip(&mut self, new_ip: Ipv4Addr) {
	self.ip = new_ip;
	}

	/// Returns the port number associated with this socket address.
	///
	/// # Examples
	///
	/// ```
	/// use std::net::{SocketAddrV4, Ipv4Addr};
	///
	/// let socket = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080);
	/// assert_eq!(socket.port(), 8080);
	/// ```
	#[must_use]
	#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
	#[cfg_attr(
	staged_api,
	rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
	)]
	pub const fn port(&self) -> u16 {
	self.port
	}

	/// Changes the port number associated with this socket address.
	///
	/// # Examples
	///
	/// ```
	/// use std::net::{SocketAddrV4, Ipv4Addr};
	///
	/// let mut socket = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080);
	/// socket.set_port(4242);
	/// assert_eq!(socket.port(), 4242);
	/// ```
	#[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
	pub fn set_port(&mut self, new_port: u16) {
	self.port = new_port;
	}
	}

	impl SocketAddrV6 {
	/// Creates a new socket address from an [`IPv6` address], a 16-bit port number,
	/// and the `flowinfo` and `scope_id` fields.
	///
	/// For more information on the meaning and layout of the `flowinfo` and `scope_id`
	/// parameters, see [IETF RFC 2553, Section 3.3].
	///
	/// [IETF RFC 2553, Section 3.3]: https://tools.ietf.org/html/rfc2553#section-3.3
	/// [`IPv6` address]: Ipv6Addr
	///
	/// # Examples
	///
	/// ```
	/// use std::net::{SocketAddrV6, Ipv6Addr};
	///
	/// let socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 0);
	/// ```
	#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
	#[must_use]
	#[cfg_attr(
	staged_api,
	rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
	)]
	pub const fn new(ip: Ipv6Addr, port: u16, flowinfo: u32, scope_id: u32) -> SocketAddrV6 {
	SocketAddrV6 {
	ip,
	port,
	flowinfo,
	scope_id,
	}
	}

	/// Returns the IP address associated with this socket address.
	///
	/// # Examples
	///
	/// ```
	/// use std::net::{SocketAddrV6, Ipv6Addr};
	///
	/// let socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 0);
	/// assert_eq!(socket.ip(), &Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1));
	/// ```
	#[must_use]
	#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
	#[cfg_attr(
	staged_api,
	rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
	)]
	pub const fn ip(&self) -> &Ipv6Addr {
	&self.ip
	}

	/// Changes the IP address associated with this socket address.
	///
	/// # Examples
	///
	/// ```
	/// use std::net::{SocketAddrV6, Ipv6Addr};
	///
	/// let mut socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 0);
	/// socket.set_ip(Ipv6Addr::new(76, 45, 0, 0, 0, 0, 0, 0));
	/// assert_eq!(socket.ip(), &Ipv6Addr::new(76, 45, 0, 0, 0, 0, 0, 0));
	/// ```
	#[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
	pub fn set_ip(&mut self, new_ip: Ipv6Addr) {
	self.ip = new_ip;
	}

	/// Returns the port number associated with this socket address.
	///
	/// # Examples
	///
	/// ```
	/// use std::net::{SocketAddrV6, Ipv6Addr};
	///
	/// let socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 0);
	/// assert_eq!(socket.port(), 8080);
	/// ```
	#[must_use]
	#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
	#[cfg_attr(
	staged_api,
	rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
	)]
	pub const fn port(&self) -> u16 {
	self.port
	}

	/// Changes the port number associated with this socket address.
	///
	/// # Examples
	///
	/// ```
	/// use std::net::{SocketAddrV6, Ipv6Addr};
	///
	/// let mut socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 0);
	/// socket.set_port(4242);
	/// assert_eq!(socket.port(), 4242);
	/// ```
	#[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
	pub fn set_port(&mut self, new_port: u16) {
	self.port = new_port;
	}

	/// Returns the flow information associated with this address.
	///
	/// This information corresponds to the `sin6_flowinfo` field in C's `netinet/in.h`,
	/// as specified in [IETF RFC 2553, Section 3.3].
	/// It combines information about the flow label and the traffic class as specified
	/// in [IETF RFC 2460], respectively [Section 6] and [Section 7].
	///
	/// [IETF RFC 2553, Section 3.3]: https://tools.ietf.org/html/rfc2553#section-3.3
	/// [IETF RFC 2460]: https://tools.ietf.org/html/rfc2460
	/// [Section 6]: https://tools.ietf.org/html/rfc2460#section-6
	/// [Section 7]: https://tools.ietf.org/html/rfc2460#section-7
	///
	/// # Examples
	///
	/// ```
	/// use std::net::{SocketAddrV6, Ipv6Addr};
	///
	/// let socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 10, 0);
	/// assert_eq!(socket.flowinfo(), 10);
	/// ```
	#[must_use]
	#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
	#[cfg_attr(
	staged_api,
	rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
	)]
	pub const fn flowinfo(&self) -> u32 {
	self.flowinfo
	}

	/// Changes the flow information associated with this socket address.
	///
	/// See [`SocketAddrV6::flowinfo`]'s documentation for more details.
	///
	/// # Examples
	///
	/// ```
	/// use std::net::{SocketAddrV6, Ipv6Addr};
	///
	/// let mut socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 10, 0);
	/// socket.set_flowinfo(56);
	/// assert_eq!(socket.flowinfo(), 56);
	/// ```
	#[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
	pub fn set_flowinfo(&mut self, new_flowinfo: u32) {
	self.flowinfo = new_flowinfo;
	}

	/// Returns the scope ID associated with this address.
	///
	/// This information corresponds to the `sin6_scope_id` field in C's `netinet/in.h`,
	/// as specified in [IETF RFC 2553, Section 3.3].
	///
	/// [IETF RFC 2553, Section 3.3]: https://tools.ietf.org/html/rfc2553#section-3.3
	///
	/// # Examples
	///
	/// ```
	/// use std::net::{SocketAddrV6, Ipv6Addr};
	///
	/// let socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 78);
	/// assert_eq!(socket.scope_id(), 78);
	/// ```
	#[must_use]
	#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
	#[cfg_attr(
	staged_api,
	rustc_const_unstable(feature = "const_socketaddr", issue = "82485")
	)]
	pub const fn scope_id(&self) -> u32 {
	self.scope_id
	}

	/// Changes the scope ID associated with this socket address.
	///
	/// See [`SocketAddrV6::scope_id`]'s documentation for more details.
	///
	/// # Examples
	///
	/// ```
	/// use std::net::{SocketAddrV6, Ipv6Addr};
	///
	/// let mut socket = SocketAddrV6::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1), 8080, 0, 78);
	/// socket.set_scope_id(42);
	/// assert_eq!(socket.scope_id(), 42);
	/// ```
	#[cfg_attr(staged_api, stable(feature = "sockaddr_setters", since = "1.9.0"))]
	pub fn set_scope_id(&mut self, new_scope_id: u32) {
	self.scope_id = new_scope_id;
	}
	}

	#[cfg_attr(staged_api, stable(feature = "ip_from_ip", since = "1.16.0"))]
	impl From<SocketAddrV4> for SocketAddr {
	/// Converts a [`SocketAddrV4`] into a [`SocketAddr::V4`].
	fn from(sock4: SocketAddrV4) -> SocketAddr {
	SocketAddr::V4(sock4)
	}
	}

	#[cfg_attr(staged_api, stable(feature = "ip_from_ip", since = "1.16.0"))]
	impl From<SocketAddrV6> for SocketAddr {
	/// Converts a [`SocketAddrV6`] into a [`SocketAddr::V6`].
	fn from(sock6: SocketAddrV6) -> SocketAddr {
	SocketAddr::V6(sock6)
	}
	}

	#[cfg_attr(staged_api, stable(feature = "addr_from_into_ip", since = "1.17.0"))]
	impl<I: Into<IpAddr>> From<(I, u16)> for SocketAddr {
	/// Converts a tuple struct (Into<[`IpAddr`]>, `u16`) into a [`SocketAddr`].
	///
	/// This conversion creates a [`SocketAddr::V4`] for an [`IpAddr::V4`]
	/// and creates a [`SocketAddr::V6`] for an [`IpAddr::V6`].
	///
	/// `u16` is treated as port of the newly created [`SocketAddr`].
	fn from(pieces: (I, u16)) -> SocketAddr {
	SocketAddr::new(pieces.0.into(), pieces.1)
	}
	}

	#[cfg_attr(staged_api, stable(feature = "socketaddr_ordering", since = "1.45.0"))]
	impl PartialOrd for SocketAddrV4 {
	fn partial_cmp(&self, other: &SocketAddrV4) -> Option<Ordering> {
	Some(self.cmp(other))
	}
	}

	#[cfg_attr(staged_api, stable(feature = "socketaddr_ordering", since = "1.45.0"))]
	impl PartialOrd for SocketAddrV6 {
	fn partial_cmp(&self, other: &SocketAddrV6) -> Option<Ordering> {
	Some(self.cmp(other))
	}
	}

	#[cfg_attr(staged_api, stable(feature = "socketaddr_ordering", since = "1.45.0"))]
	impl Ord for SocketAddrV4 {
	fn cmp(&self, other: &SocketAddrV4) -> Ordering {
	self.ip()
	.cmp(other.ip())
	.then(self.port().cmp(&other.port()))
	}
	}

	#[cfg_attr(staged_api, stable(feature = "socketaddr_ordering", since = "1.45.0"))]
	impl Ord for SocketAddrV6 {
	fn cmp(&self, other: &SocketAddrV6) -> Ordering {
	self.ip()
	.cmp(other.ip())
	.then(self.port().cmp(&other.port()))
	}
	}

	#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
	impl hash::Hash for SocketAddrV4 {
	fn hash<H: hash::Hasher>(&self, s: &mut H) {
	(self.port, self.ip).hash(s)
	}
	}
	#[cfg_attr(staged_api, stable(feature = "rust1", since = "1.0.0"))]
	impl hash::Hash for SocketAddrV6 {
	fn hash<H: hash::Hasher>(&self, s: &mut H) {
	(self.port, &self.ip, self.flowinfo, self.scope_id).hash(s)
	}
	}