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Make all methods of std::net::Ipv6Addr const

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Make the following methods of `std::net::Ipv6Addr` unstable const under the `const_ipv6` feature:
- `segments`
- `is_unspecified`
- `is_loopback`
- `is_global` (unstable)
- `is_unique_local`
- `is_unicast_link_local_strict`
- `is_documentation`
- `multicast_scope`
- `is_multicast`
- `to_ipv4_mapped`
- `to_ipv4`

Changed the implementation of `is_unspecified` and `is_loopback` to use a `match` instead of `==`.

Part of #76205
This commit is contained in:
CDirkx 2020-09-01 19:00:20 +02:00
parent e88e908e66
commit b31cc8f83e
2 changed files with 31 additions and 16 deletions
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1
library/std/src/lib.rs
View file

@ -238,6 +238,7 @@
#![feature(concat_idents)]
#![feature(const_cstr_unchecked)]
#![feature(const_fn_transmute)]
#![feature(const_ipv6)]
#![feature(const_raw_ptr_deref)]
#![feature(container_error_extra)]
#![feature(core_intrinsics)]

46
library/std/src/net/ip.rs
View file

@ -1102,8 +1102,9 @@ impl Ipv6Addr {
/// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).segments(),
/// [0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff]);
/// ```
#[rustc_const_unstable(feature = "const_ipv6", issue = "76205")]
#[stable(feature = "rust1", since = "1.0.0")]
pub fn segments(&self) -> [u16; 8] {
pub const fn segments(&self) -> [u16; 8] {
// All elements in `s6_addr` must be big endian.
// SAFETY: `[u8; 16]` is always safe to transmute to `[u16; 8]`.
let [a, b, c, d, e, f, g, h] = unsafe { transmute::<_, [u16; 8]>(self.inner.s6_addr) };
@ -1135,9 +1136,10 @@ impl Ipv6Addr {
/// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_unspecified(), false);
/// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0).is_unspecified(), true);
/// ```
#[rustc_const_unstable(feature = "const_ipv6", issue = "76205")]
#[stable(since = "1.7.0", feature = "ip_17")]
pub fn is_unspecified(&self) -> bool {
self.segments() == [0, 0, 0, 0, 0, 0, 0, 0]
pub const fn is_unspecified(&self) -> bool {
matches!(self.segments(), [0, 0, 0, 0, 0, 0, 0, 0])
}
/// Returns [`true`] if this is a loopback address (::1).
@ -1155,9 +1157,10 @@ impl Ipv6Addr {
/// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_loopback(), false);
/// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0x1).is_loopback(), true);
/// ```
#[rustc_const_unstable(feature = "const_ipv6", issue = "76205")]
#[stable(since = "1.7.0", feature = "ip_17")]
pub fn is_loopback(&self) -> bool {
self.segments() == [0, 0, 0, 0, 0, 0, 0, 1]
pub const fn is_loopback(&self) -> bool {
matches!(self.segments(), [0, 0, 0, 0, 0, 0, 0, 1])
}
/// Returns [`true`] if the address appears to be globally routable.
@ -1182,7 +1185,8 @@ impl Ipv6Addr {
/// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0x1).is_global(), false);
/// assert_eq!(Ipv6Addr::new(0, 0, 0x1c9, 0, 0, 0xafc8, 0, 0x1).is_global(), true);
/// ```
pub fn is_global(&self) -> bool {
#[rustc_const_unstable(feature = "const_ipv6", issue = "76205")]
pub const fn is_global(&self) -> bool {
match self.multicast_scope() {
Some(Ipv6MulticastScope::Global) => true,
None => self.is_unicast_global(),
@ -1208,7 +1212,8 @@ impl Ipv6Addr {
/// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_unique_local(), false);
/// assert_eq!(Ipv6Addr::new(0xfc02, 0, 0, 0, 0, 0, 0, 0).is_unique_local(), true);
/// ```
pub fn is_unique_local(&self) -> bool {
#[rustc_const_unstable(feature = "const_ipv6", issue = "76205")]
pub const fn is_unique_local(&self) -> bool {
(self.segments()[0] & 0xfe00) == 0xfc00
}
@ -1263,7 +1268,8 @@ impl Ipv6Addr {
/// [IETF RFC 4291]: https://tools.ietf.org/html/rfc4291
/// [IETF RFC 4291 section 2.5.6]: https://tools.ietf.org/html/rfc4291#section-2.5.6
/// [RFC 4291 errata 4406]: https://www.rfc-editor.org/errata/eid4406
pub fn is_unicast_link_local_strict(&self) -> bool {
#[rustc_const_unstable(feature = "const_ipv6", issue = "76205")]
pub const fn is_unicast_link_local_strict(&self) -> bool {
(self.segments()[0] & 0xffff) == 0xfe80
&& (self.segments()[1] & 0xffff) == 0
&& (self.segments()[2] & 0xffff) == 0
@ -1320,7 +1326,8 @@ impl Ipv6Addr {
///
/// [IETF RFC 4291 section 2.4]: https://tools.ietf.org/html/rfc4291#section-2.4
/// [RFC 4291 errata 4406]: https://www.rfc-editor.org/errata/eid4406
pub fn is_unicast_link_local(&self) -> bool {
#[rustc_const_unstable(feature = "const_ipv6", issue = "76205")]
pub const fn is_unicast_link_local(&self) -> bool {
(self.segments()[0] & 0xffc0) == 0xfe80
}
@ -1359,7 +1366,8 @@ impl Ipv6Addr {
/// addresses.
///
/// [RFC 3879]: https://tools.ietf.org/html/rfc3879
pub fn is_unicast_site_local(&self) -> bool {
#[rustc_const_unstable(feature = "const_ipv6", issue = "76205")]
pub const fn is_unicast_site_local(&self) -> bool {
(self.segments()[0] & 0xffc0) == 0xfec0
}
@ -1381,7 +1389,8 @@ impl Ipv6Addr {
/// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_documentation(), false);
/// assert_eq!(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 0).is_documentation(), true);
/// ```
pub fn is_documentation(&self) -> bool {
#[rustc_const_unstable(feature = "const_ipv6", issue = "76205")]
pub const fn is_documentation(&self) -> bool {
(self.segments()[0] == 0x2001) && (self.segments()[1] == 0xdb8)
}
@ -1416,7 +1425,8 @@ impl Ipv6Addr {
/// assert_eq!(Ipv6Addr::new(0x2001, 0xdb8, 0, 0, 0, 0, 0, 0).is_unicast_global(), false);
/// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_unicast_global(), true);
/// ```
pub fn is_unicast_global(&self) -> bool {
#[rustc_const_unstable(feature = "const_ipv6", issue = "76205")]
pub const fn is_unicast_global(&self) -> bool {
!self.is_multicast()
&& !self.is_loopback()
&& !self.is_unicast_link_local()
@ -1440,7 +1450,8 @@ impl Ipv6Addr {
/// );
/// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).multicast_scope(), None);
/// ```
pub fn multicast_scope(&self) -> Option<Ipv6MulticastScope> {
#[rustc_const_unstable(feature = "const_ipv6", issue = "76205")]
pub const fn multicast_scope(&self) -> Option<Ipv6MulticastScope> {
if self.is_multicast() {
match self.segments()[0] & 0x000f {
1 => Some(Ipv6MulticastScope::InterfaceLocal),
@ -1472,8 +1483,9 @@ impl Ipv6Addr {
/// assert_eq!(Ipv6Addr::new(0xff00, 0, 0, 0, 0, 0, 0, 0).is_multicast(), true);
/// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).is_multicast(), false);
/// ```
#[rustc_const_unstable(feature = "const_ipv6", issue = "76205")]
#[stable(since = "1.7.0", feature = "ip_17")]
pub fn is_multicast(&self) -> bool {
pub const fn is_multicast(&self) -> bool {
(self.segments()[0] & 0xff00) == 0xff00
}
@ -1498,7 +1510,8 @@ impl Ipv6Addr {
/// Some(Ipv4Addr::new(192, 10, 2, 255)));
/// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1).to_ipv4_mapped(), None);
/// ```
pub fn to_ipv4_mapped(&self) -> Option<Ipv4Addr> {
#[rustc_const_unstable(feature = "const_ipv6", issue = "76205")]
pub const fn to_ipv4_mapped(&self) -> Option<Ipv4Addr> {
match self.octets() {
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff, a, b, c, d] => {
Some(Ipv4Addr::new(a, b, c, d))
@ -1525,8 +1538,9 @@ impl Ipv6Addr {
/// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1).to_ipv4(),
/// Some(Ipv4Addr::new(0, 0, 0, 1)));
/// ```
#[rustc_const_unstable(feature = "const_ipv6", issue = "76205")]
#[stable(feature = "rust1", since = "1.0.0")]
pub fn to_ipv4(&self) -> Option<Ipv4Addr> {
pub const fn to_ipv4(&self) -> Option<Ipv4Addr> {
if let [0, 0, 0, 0, 0, 0 | 0xffff, ab, cd] = self.segments() {
let [a, b] = ab.to_be_bytes();
let [c, d] = cd.to_be_bytes();