rust-lang-nursery/lazy-static.rs

Health v2 · maintenance only

Adoption not part of the score

2034 stars · 125 forks observed · 2026-08-28

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

A Rust macro crate for declaring lazily evaluated static variables that require runtime initialization, such as heap-allocated collections or non-const computations. It is largely superseded by std::sync::LazyLock in the Rust standard library.

Use cases

• define lazily initialized static variables in rust
• create global hashmap or vector singletons in rust
• initialize statics with non-const function calls
• avoid unsafe static initialization in rust
• share lazily computed configuration across a rust program

When to choose

• you need lazy statics on rustc versions older than 1.80 without LazyLock
• you prefer a macro-based API for declaring statics
• you maintain legacy code already using lazy_static

When to avoid

• you target modern Rust where std::sync::LazyLock covers the same need without a dependency
• you need async lazy initialization
• you want actively developed features beyond lazy statics

Facets

library · maturity maintenance

concurrency developer-tools programming-languages developer-tools rust cross-platform lazy-evaluation static-variables macro rust-crate singletons

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