Bug: 154052335

Clone this repo:
  1. 9c1034d Allow using lazy_static from Mainline modules by Bernie Innocenti · 5 weeks ago master
  2. 882b714 Mark ab/6881855 as merged by Xin Li · 8 weeks ago
  3. 91a3295 TEST_MAPPING: test dependers of this crate am: 23102378e7 by Jeff Vander Stoep · 2 months ago
  4. 2310237 TEST_MAPPING: test dependers of this crate by Jeff Vander Stoep · 2 months ago
  5. efc5229 Skip ab/6749736 in stage. by Xin Li · 3 months ago

lazy-static.rs

A macro for declaring lazily evaluated statics in Rust.

Using this macro, it is possible to have statics that require code to be executed at runtime in order to be initialized. This includes anything requiring heap allocations, like vectors or hash maps, as well as anything that requires non-const function calls to be computed.

Travis-CI Status Latest version Documentation License

Minimum supported rustc

1.27.2+

This version is explicitly tested in CI and may only be bumped in new minor versions. Any changes to the supported minimum version will be called out in the release notes.

Getting Started

lazy-static.rs is available on crates.io. It is recommended to look there for the newest released version, as well as links to the newest builds of the docs.

At the point of the last update of this README, the latest published version could be used like this:

Add the following dependency to your Cargo manifest...

[dependencies]
lazy_static = "1.4.0"

...and see the docs for how to use it.

Example

#[macro_use]
extern crate lazy_static;

use std::collections::HashMap;

lazy_static! {
    static ref HASHMAP: HashMap<u32, &'static str> = {
        let mut m = HashMap::new();
        m.insert(0, "foo");
        m.insert(1, "bar");
        m.insert(2, "baz");
        m
    };
}

fn main() {
    // First access to `HASHMAP` initializes it
    println!("The entry for `0` is \"{}\".", HASHMAP.get(&0).unwrap());

    // Any further access to `HASHMAP` just returns the computed value
    println!("The entry for `1` is \"{}\".", HASHMAP.get(&1).unwrap());
}

License

Licensed under either of

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.