commit | 9f7c9f0e36f54dc73eb41e04515a515a878c9d24 | [log] [tgz] |
---|---|---|
author | Matthew Maurer <mmaurer@google.com> | Thu Mar 09 19:10:24 2023 +0000 |
committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | Thu Mar 09 19:10:24 2023 +0000 |
tree | b58781bb0c6086aecc988ee587bd6e9dbf16ec20 | |
parent | e4d9e04bc1d23e38b76ea4a4f7cf8a88902ebb90 [diff] | |
parent | 9fbe64fe487a9f7400287afcb28322d0e9f4c441 [diff] |
Make lazy_static available to product and vendor am: 82f1666a5a am: af69671014 am: fa911c06ee am: 17b5976f63 am: 9fbe64fe48 Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/lazy_static/+/2476288 Change-Id: I05ec0d439aa62e9f0f0f7a29bf62ef8ac7141575 Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
A macro for declaring lazily evaluated statics in Rust.
Using this macro, it is possible to have static
s 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.
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.
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.
#[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()); }
Licensed under either of
at your option.
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.