Lib.rs

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#lazy #initialization

lazy-init

Lazy initialization

by Kyle Huey and 3 contributors

7 releases (4 breaking)

Uses old Rust 2015

0.5.1 Aug 1, 2022
0.5.0 Jan 18, 2021
0.4.0 Aug 22, 2020
0.3.0 Jan 18, 2018
0.1.1 Jan 28, 2017

#200 in Rust patterns

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Used in 14 crates (6 directly)

Apache-2.0/MIT

14KB
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lib.rs:

A crate for things that are

  1. Lazily initialized
  2. Expensive to create
  3. Immutable after creation
  4. Used on multiple threads

Lazy<T> is better than Mutex<Option<T>> because after creation accessing T does not require any locking, just a single boolean load with Ordering::Acquire (which on x86 is just a compiler barrier, not an actual memory barrier).

No runtime deps