Tracking Issue for Hashing in const context

[onestacked]

Feature gate: #![feature(const_hash)]

This is a tracking issue for using the Hash Hasher and BuildHasher traits in const Context.

Public API

// std::collections::hash
impl DefaultHasher {
    pub const fn new() -> DefaultHasher;
}
impl const Hasher for DefaultHasher;

// core::hash
#[const_trait]
trait Hash;
#[const_trait]
trait Hasher;
#[const_trait]
trait BuildHasher;

impl const BuildHasher for BuildHasherDefault;

impl const Hash for bool;
impl const Hash for char;
impl const Hash for str;
impl const Hash for !;

impl<T: ~const Hash> const Hash for &T;
impl<T: ~const Hash> const Hash for &mut T;
impl<T: ~const Hash> const Hash for [T];

impl<A, B, ...> const Hash for (A, B, ...)
where
    A: ~const Hash,
    B: ~const Hash, ...;

Steps / History

• Implementation: Make Hash, Hasher and BuildHasher #[const_trait] and make Sip const Hasher #104060
• Final comment period (FCP)¹
• Stabilization PR

Unresolved Questions

• None yet.

Footnotes

1. https://std-dev-guide.rust-lang.org/feature-lifecycle/stabilization.html ↩