Tracking Issue for Hashing in const context

[onestacked]

Feature gate: #![feature(const_hash)]

This is a tracking issue for constructing "hashers" in const conext.

Public API

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

impl SipHasher {
    #[deprecated]
    pub const fn new() -> SipHasher;
    #[deprecated]
    pub const fn new_with_keys(key0: u64, key1: u64) -> SipHasher;
}
impl SipHasher13 {
    #[deprecated]
    pub const fn new() -> SipHasher;
    #[deprecated]
    pub const fn new_with_keys(key0: u64, key1: u64) -> SipHasher;
}

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 ↩

[RalfJung]

Most of this feature got removed in #110393, I updated the description to match what is left.