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boc/aamos-ledger-rust/target/release/deps/libonce_cell-dbcb3221bc930737.rlib
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ARCHITECTURE: NFC roadmap, edge AI, audit logging
2026-06-29 16:24:48 +00:00
!<arch>
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†½ë°½È´¨î ¯õ&°)ž*4½&;BF¥…À¤,ËdüÙñt # OverviewÁúüJG `once_cell` provides two new cell-like types, [`unsync::OnceCell`] andÁü^PM [`sync::OnceCell`]. A `OnceCell` might store arbitrary non-`Copy` types, canÁü¯HE be assigned to at most once and provides direct access to the storedÁüøKH contents. The core API looks *roughly* like this (and there's much moreÁ´Ä inside, read on!):ÁÛú”ß ```rust,ignoreÁÌò impl<T> OnceCell<T> {ÁüŒ-* const fn new() -> OnceCell<T> { ... }Áüº85 fn set(&self, value: T) -> Result<(), T> { ... }Áüó+( fn get(&self) -> Option<&T> { ... }Á,Ÿ }Á<¥ ```Á­úü±MJ Note that, like with [`RefCell`] and [`Mutex`], the `set` method requiresÁüÿOL only a shared reference. Because of the single assignment restriction `get`ÁüÏ=: can return a `&T` instead of `Ref<T>` or `MutexGuard<T>`.Á�úü‘NK The `sync` flavor is thread-safe (that is, implements the [`Sync`] trait),Áüà" while the `unsync` one is not.Áƒúü‡52 [`unsync::OnceCell`]: unsync/struct.OnceCell.htmlÁü½1. [`sync::OnceCell`]: sync/struct.OnceCell.htmlÁüïGD [`RefCell`]: https://doc.rust-lang.org/std/cell/struct.RefCell.htmlÁü·C@ [`Mutex`]: https://doc.rust-lang.org/std/sync/struct.Mutex.htmlÁüûB? [`Sync`]: https://doc.rust-lang.org/std/marker/trait.Sync.htmlÁ¾ úlÂ
# RecipesÁÐ úüÔ 96 `OnceCell` might be useful for a variety of patterns.ÁŽ
úü’
)& ## Safe Initialization of Global DataÁ¼
ú\À
 ```rustÁüÌ
B? # #[cfg(any(feature = "std", feature = "critical-section"))] {Á¼�  use std::{env, io};Á§ úü« " use once_cell::sync::OnceCell;ÁÎ ú¤Ò  #[derive(Debug)]Á¼ç  pub struct Logger {Átÿ // ...Á,Ž ƒÄü” 85 static INSTANCE: OnceCell<Logger> = OnceCell::new();ÁÍ úŒÑ  impl Logger {Áüã ,) pub fn global() -> &'static Logger {Áü�
>; INSTANCE.get().expect("logger is not initialized")ÁLÏ
 }ÁÙ
úüÝ
HE fn from_cli(args: env::Args) -> Result<Logger, std::io::Error> {ÁŒ¦ // ...Áĸ # Ok(Logger {})ÁLÑëÏ,ÛƒÄáú|å fn main() {Áüõ<9 let logger = Logger::from_cli(env::args()).unwrap();Áü²&# INSTANCE.set(logger).unwrap();ÁüÙ-* // use `Logger::global()` from now onÁ,‡ƒÄ<� # }Á<•‘Ä�úü¡# ## Lazy Initialized Global DataÁÅúüÉFC This is essentially the `lazy_static!` macro, but without a macro.Á�ú\”àËü BõËüã1. use std::{sync::Mutex, collections::HashMap};Á•úü™"í̼úüÀ>; fn global_data() -> &'static Mutex<HashMap<i32, String>> {ÁüÿQN static INSTANCE: OnceCell<Mutex<HashMap<i32, String>>> = OnceCell::new();ÁüÑ! INSTANCE.get_or_init(|| {Áüó'$ let mut m = HashMap::new();Áü›.+ m.insert(13, "Spica".to_string());ÁüÊ/, m.insert(74, "Hoyten".to_string());ÁÌú Mutex::new(m)ÁT” })Á,ŸƒÄ<¥ŽÓ<­‘ĵúü¹OL There are also the [`sync::Lazy`] and [`unsync::Lazy`] convenience types toÁä‰ streamline this pattern:Á¦ú\ªàËü¶BõËüù1èÔô« use once_cell::sync::Lazy;ÁÊúüÎJG static GLOBAL_DATA: Lazy<Mutex<HashMap<i32, String>>> = Lazy::new(|| {Áü™# let mut m = HashMap::new();Áü½*' m.insert(13, "Spica".to_string());Áüè+( m.insert(74, "Hoyten".to_string());Á¬” Mutex::new(m)Á<ª });Á²ú|¶¼ÑüÆ63 println!("{:?}", GLOBAL_DATA.lock().unwrap());Á,ýƒÄ<ƒŽÓ<‹‘Ä“úü—KH Note that the variable that holds `Lazy` is declared as `static`, *not*ÁüãPM `const`. This is important: using `const` instead compiles, but works wrong.Á´úü¸)& [`sync::Lazy`]: sync/struct.Lazy.htmlÁüâ-* [`unsync::Lazy`]: unsync/struct.Lazy.htmlÁ�úü”&# ## General purpose lazy evaluationÁ»úü¿=: Unlike `lazy_static!`, `Lazy` works with local variables.Áýú\�àËü�  use once_cell::unsync::Lazy;Á®ú|²¼Ñü  let ctx = vec![1, 2, 3];Áüã" let thunk = Lazy::new(|| {Áü†# ctx.iter().sum::<i32>()Á\ª });Áô¶ assert_eq!(*thunk, 6);Á,ÕƒÄ<Û‘ÄãúüçLI If you need a lazy field in a struct, you probably should use `OnceCell`Áü´A> directly, because that will allow you to access `self` duringÁœö initialization.ÁŠ ú\Ž àËüš ! use std::{fs, path::PathBuf};Á¼ úüÀ $! use once_cell::unsync::OnceCell;Áå ú„é
struct Ctx {Áìú  config_path: PathBuf,Áü˜!! config: OnceCell<String>,Á,º!ƒÄÀ!útÄ! impl Ctx {ÁüÓ!B? pub fn get_config(&self) -> Result<&str, std::io::Error> {Áü–"63 let cfg = self.config.get_or_try_init(|| {ÁüÍ"52 fs::read_to_string(&self.config_path)Á„ƒ#
})?;Áä”# Ok(cfg.as_str())ÁL±#ëÏ,»#ƒÄ<Á#‘ÄÉ#úäÍ# ## Lazily Compiled RegexÁê#úüî#HE This is a `regex!` macro which takes a string literal and returns anÁü·$63 *expression* that evaluates to a `&'static Regex
deadlock.Á�Rúü‘R&# **Does this crate support async?**Á¸Rú¼¼R No, but you can useÁüÔRJG [`async_once_cell`](https://crates.io/crates/async_once_cell) instead.ÁŸSúü£S)& **Does this crate support `no_std`?**ÁÍSúüÑSJG Yes, but with caveats. `OnceCell` is a synchronization primitive whichÁüœTMJ _semantically_ relies on blocking. `OnceCell` guarantees that at most oneÁüêTMJ `f` will be called to compute the value. If two threads of execution callÁü¸U85 `get_or_init` concurrently, one of them has to wait.ÁñUúüõUMJ Waiting fundamentally requires OS support. Execution environment needs toÁüÃVPM understand who waits on whom to prevent deadlocks due to priority inversion.Áü”WMJ You _could_ make code to compile by blindly using pure spinlocks, but theÁüâW+( runtime behavior would be subtly wrong.ÁŽXúü’XHE Given these constraints, `once_cell` provides the following options:ÁÛXúüßXPM - The `race` module provides similar, but distinct synchronization primitiveÁü°YMJ which is compatible with `no_std`. With `race`, the `f` function can beÁüþYNK called multiple times by different threads, but only one thread will winÁÜÍZ to install the value.ÁüéZNK - `critical-section` feature (with a `-`, not `_`) uses `critical_section`Áä¸[ to implement blocking.ÁÕ[úüÙ[! **Can I bring my own mutex?**Áû[úüÿ[OL There is [generic_once_cell](https://crates.io/crates/generic_once_cell) toÁ¤Ï\ allow just that.Áä\úüè\JG **Should I use `std::cell::OnceCell`, `once_cell`, or `lazy_static`?**Á³]úü·]PM If you can use `std` version (your MSRV is at least 1.70, and you don't needÁüˆ^PM extra features `once_cell` provides), use `std`. Otherwise, use `once_cell`.ÁäÙ^ Don't use `lazy_static`.Áö^ú¤ú^ # Related cratesÁ�_úü“_LI * Most of this crate's functionality is available in `std` starting withÁüà_EB Rust 1.70. See `std::cell::OnceCell` and `std::sync::OnceLock`.Áü¦`KH * [double-checked-cell](https://github.com/niklasf/double-checked-cell)Áüò`52 * [lazy-init](https://crates.io/crates/lazy-init)Áü¨a30 * [lazycell](https://crates.io/crates/lazycell)ÁüÜa;8 * [mitochondria](https://crates.io/crates/mitochondria)Áü˜b96 * [lazy_static](https://crates.io/crates/lazy_static)ÁüÒbA> * [async_once_cell](https://crates.io/crates/async_once_cell)Áü”cLI * [generic_once_cell](https://crates.io/crates/generic_once_cell) (bringÁ¬ác your own mutex)ÁF¥…Àè;¤é;<
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