rust-phf/rust-phf

Health v2 · maintenance only

Adoption not part of the score

2183 stars · 138 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Rust-PHF is a Rust library for generating efficient compile-time static maps and sets using perfect hash functions (CHD algorithm by default, with an experimental ptrhash layout). It supports construction via procedural macros (phf_macros) or build-time code generation (phf_codegen), and works in no_std environments.

Use cases

• create static lookup tables at compile time in Rust
• map string keywords to enum values with zero runtime hashing cost
• build static maps in no_std embedded Rust projects
• generate perfect hash tables in build.rs with phf_codegen
• look up operators or tokens by multiple key aliases

When to choose

• you need fast, allocation-free static maps or sets known at compile time
• you want zero-cost lookup tables in no_std or embedded environments
• you're writing parsers or interpreters with fixed keyword tables

When to avoid

• you need mutable or runtime-constructed maps
• your keys are only known at runtime
• you need ordered maps or rich map APIs beyond lookup

Facets

library · maturity stable

serialization developer-tools programming-languages developer-tools rust cross-platform perfect-hash compile-time static-maps no-std proc-macros lookup-tables algorithms

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