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boc/aamos-ledger-rust/target/debug/deps/libonce_cell-67622b8a8d4197b3.rlib
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ARCHITECTURE: NFC roadmap, edge AI, audit logging
2026-06-29 16:24:48 +00:00
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¬ÛëÖÛÈ´¨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 ©âü” 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 {})ÁLÑ‘î,Û©âáú|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,‡©â<� # }Á<•·â�úü¡# ## Lazy Initialized Global DataÁÅúüÉFC This is essentially the `lazy_static!` macro, but without a macro.Á�ú\”†êü B›êüã1. use std::{sync::Mutex, collections::HashMap};Á•úü™"“ë¼úüÀ>; 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,Ÿ©â<¥´ñ<­·âµúü¹OL There are also the [`sync::Lazy`] and [`unsync::Lazy`] convenience types toÁä‰ streamline this pattern:Á¦ú\ª†êü¶B›êüù1Žóô« 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|¶âïüÆ63 println!("{:?}", GLOBAL_DATA.lock().unwrap());Á,ý©â<ƒ´ñ<‹·â“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\�†êü�  use once_cell::unsync::Lazy;Á®ú|²âïü  let ctx = vec![1, 2, 3];Áüã" let thunk = Lazy::new(|| {Áü†# ctx.iter().sum::<i32>()Á\ª });Áô¶ assert_eq!(*thunk, 6);Á,Õ©â<Û·âãúüçLI 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 †êüš ! 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!©âÀ!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±#‘î,»#©â<Á#·âÉ#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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# ExampleÁ<ój·âüÿj$Ò„¨kúü°k let cell = OnceCell::new();ÁüÔk" assert!(cell.get().is_none());Áûkúüƒl.+ let value: &String = cell.get_or_init(|| {Áü¶l# "Hello, World!".to_string()Á<Þl´ûüêl'$ assert_eq!(value, "Hello, World!");Áü–m" assert!(cell.get().is_some());Á<½m·âDÔm¥TT„Ù Ýmî'ÃöMÞtŽNUä™n,™nFSSÏ3ü¡pA¥WW„Ù ¦p£Úl©p³ÚT¹pî'üêp.¥YY„Ù ïp³ÚTòpî'ü¡q¥[[„Ù ¦qî'\´\¤Ëq<Îqî'ZZ
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kõ&»>œôz¥mm„Ù ùzî'nopqrstx{|ü¸{!ì’{ Creates a new empty cell.ÁÅ{î'll¥lüÑ|0ü¥|# Creates a new initialized cell.ÁTÞ|õ&î'llôs»ý?üÙ~üÔ}-* Gets a reference to the underlying value.ÁŠ~úü–~(% Returns `None` if the cell is empty.Áà~£ £î'Û¼ݼÞ¼©ß¼à¼ÛἈcSñŸ«‡zÙ £õ&l ä~lƒm$å~üþ†+üÐ�52 Gets a mutable reference to the underlying value.ÁŽ‚úüš‚(°„Ë‚úüׂNK This method is allowed to violate the invariant of writing to a `OnceCell`Áü®ƒIF at most once because it requires `&mut` access to `self`. As with allÁü€„FC interior mutability, `&mut` access permits arbitrary modification:ÁÏ„ú<Û„·âüë„$Ò„˜…úü¤…2/ let mut cell: OnceCell<u32> = OnceCell::new();ÁÔß… cell.set(92).unwrap();Áü‚†" *cell.get_mut().unwrap() = 93;Áü­†&# assert_eq!(cell.get(), Some(&93));Á<܆·â<…‡¤ ¤î'Û¼ݼÞ¼©ß¼à¼ÛἈcSñŸ«‡zÙ ¤õ&l �‡l±u$’‡ü¹Œ,ü¨ˆ.+ Sets the contents of this cell to `value`.Á߈úüëˆEB Returns `Ok(())` if the cell was empty and `Err(value)` if it wasÁL¹‰ full.Áˉúl׉þô<퉷âüý‰$Ò„ªŠúü¶Š¼õüÞŠ"åõ‰‹úü•‹%" assert_eq!(cell.set(92), Ok(()));ÁüË&# assert_eq!(cell.set(62), Err(62));Áò‹úüþ‹"À÷<©Œ·âÀŒ¥ ¥î'õ&­Žl ÄŒlî£$ÅŒ»Güã‘9ü„ŽRO Like [`set`](Self::set), but also returns a reference to the final cell value.ÁߎúlëŽþô<��·âü‘�$Ò„¾�úüÊ�¼õüò�"åõ��úü©�-* assert_eq!(cell.try_insert(92), Ok(&92));Áüß�41 assert_eq!(cell.try_insert(62), Err((&92, 62)));Áœ‘úü¨‘"À÷<Ó‘·âTꑦ ¦î'õ&Ö¿Ù¿Ú¿«Û¿ˆÜ¿Ý¿Þ¿ˆ‚†f|Â
 ¦õ&ð”õ&l õ‘l¡Œ$ö‘»‡Kü‹œTü¯–;8 Gets the contents of the cell, initializing it with `f`ÁÔó– if the cell was empty.Á–—úd¢— # PanicsÁ·—úü×FC If `f` panics, the panic is propagated to the caller, and the cellÁÔ’˜ remains uninitialized.Áµ˜úüÁ˜EB It is an error to reentrantly initialize the cell from `f`. DoingÁÔ�™ so results in a panic.Á²™úl¾™þô<Ô™·âüä™$Ò„‘šúü�š¼õüÅš(% let value = cell.get_or_init(|| 92);ÁÜöš assert_eq!(value, &92);Áüš›41 let value = cell.get_or_init(|| unreachable!());ÁÜ×›Ò˜<û›·â\’œ§ §î'ª) §õ&l—uu ¡œlýÝ žœ�ÞlÑœª)™6˜"õ& Ýœ
tõ&ª)$¢œ±N<>Löœ$ûœF£›ÌRþ²†Gª�tŠÞw¢Þw¿Þwwtß›üÎ¥qü°ž>; Gets the contents of the cell, initializing it with `f` ifÁü÷ž@= the cell was empty. If the cell was empty and `f` failed, anÁ´ÀŸ error is returned.Áߟúd럲•€ úüŒ FÖ•ÔÛ ¦–þ úüŠ¡EØ–ÔØ¡§—û¡úl‡¢þô<�¢·âü­¢$Ò„Ú¢úü梼õüŽ£:7 assert_eq!(cell.get_or_try_init(|| Err(())), Err(()));ÁüÑ£"åõüü£<9 let value = cell.get_or_try_init(|| -> Result<i32, ()> {ÁtÁ¤
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Œõ&ª)€°\üæÇ3üÌÆ41 Consumes this `Lazy` returning the stored value.Á‰Çúü•ÇHE Returns `Ok(value)` if `Lazy` is initialized and `Err(f)` otherwise.ÁTíÇñ(´Á‰‰
�õ&ª)Ïx’`‰É�ŠÞŽ¢ÞŽ¿ÞŽŽ�£À¹É�ŠÞ�¢Þ�¿Þ���õÃü–Ê$¥‘—’‘’·› ­ÊýÝ žÊ�Þl¡Ê„Ù ›Êñ(“•—˜35ü€Î%üÅÊGD Forces the evaluation of this lazy value and returns a reference toÁ|•Ë the result.Á­Ëúü¹Ë<9 This is equivalent to the `Deref` impl, but is explicit.ÁþËúlŠÌþô< Ì·âü°Ì ž€ÙÌúüåÌ  let lazy = Lazy::new(|| 92);ÁŽÍúüšÍ(% assert_eq!(Lazy::force(&lazy), &92);ÁäËÍ assert_eq!(&*lazy, &92);Á<ðÍ·â,‡Î­ ­ñ( ­õ&� “Î�™ÙÏx•cÊΓŠÞ”¢Þ”¿Þ””“·ÇüÆÓ1üöÏOL Forces the evaluation of this lazy value and returns a mutable reference toÁ|ÎСÀæÐúüòÐ?< This is equivalent to the `DerefMut` impl, but is explicit.ÁºÑúlÆÑþô<ÜÑ·âüìÑ ž€•Òúü¡Ò$! let mut lazy = Lazy::new(|| 92);ÁÎÒúüÚÒ0- assert_eq!(Lazy::force_mut(&mut lazy), &92);ÁÔ“Ó assert_eq!(*lazy, 92);Á<¶Ó·âLÍÓ® ®ñ( ®õ&� ÝÓ�¢ÚÏxAiçÖ•ŠÞ–¢Þ–¿Þ––•–ÒüÀÚ+ü�×:7 Gets the reference to the result of this lazy value ifÁüÐ×1. it was initialized, otherwise returns `None`.ÁŠØúl–Øþô<¬Ø·âü¼Ø ž€åØúüñØ ÔÁšÙúü¦Ù'$ assert_eq!(Lazy::get(&lazy), None);ÁäÖÙ¾ÂüûÙ,) assert_eq!(Lazy::get(&lazy), Some(&92));Á<°Ú·âÇÚ¯ ¯ñ(Û¼ݼÞ¼©ß¼à¼ÛἈcSñŸ«‡zÙ ¯õ&� ÑÚ�
—õ&ª)Ïx9küîÞ7ü�ÛB? Gets the mutable reference to the result of this lazy value ifÁüèÛ1ÇÉ¢Üúl®Üþô<ÄÜ·âüÔÜ ž€ýÜúü‰Ý$¨Æ¶ÝúüÂÝ/, assert_eq!(Lazy::get_mut(&mut lazy), None);ÁÔúÝžÇü�Þ85 assert_eq!(Lazy::get_mut(&mut lazy), Some(&mut 92));Á<ÞÞ·â<õÞ° °ñ(Û¼ݼÞ¼©ß¼à¼ÛἈcSñŸ«‡zÙ °õ&� ƒß�
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Êõ&$³„üó‹+üû†74 Gets the mutable reference to the underlying value.Á»‡úüLJ(°„ø‡úü„ˆNë†üÛˆIćü­‰F˜ˆü‰ú<ˆŠ·âü˜Š"“ëÊúüÏŠ2 ‰ÔŠ‹܉Ü­‹¼©<Ñ‹·â<ú‹½ ½ž*Û¼ݼÞ¼©ß¼à¼ÛἈcSñŸ«‡zÙ ½õ&Å ‚ŒÅ�å$‡Œü—�(üÑŒFC Get the reference to the underlying value, without checking if theÁÄ � cell is initialized.ÁÁ�údÍ� # SafetyÁâ�úüî�FC Caller must ensure that the cell is in initialized state, and thatÁü½Ž?< the contents are acquired by (synchronized to) this thread.Ál¥�¾ ¾ž* ¾õ&Å ³�Åõò$´�ü»•,üø�.�Œ¯�úü»�EÕŒL‰‘¤�›‘úl§‘þô½‘ú<É‘·âüÙ‘"“ë„’úü�’1. static CELL: OnceCell<i32> = OnceCell::new();ÁÊ’ú|Ö’âïüî’&# assert!(CELL.get().is_none());Á�“úü©“ std::thread::spawn(|| {ÁüÑ“-* assert_eq!(CELL.set(92), Ok(()));Á܇” }).join().unwrap();Á«”úü·”*' assert_eq!(CELL.set(62), Err(62));Áüê”*' assert_eq!(CELL.get(), Some(&92));Á,�•©â<«•·â•¿ ¿ž*õ&­ŽÅ Æ•Å
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 Àõ&�‡õ&Å �›Åõú$‚›»6€û›ÎŠÞÏ¢ÞÏ¿ÞÏÏÎçþü¾¥Tü¹�GD Gets the contents of the cell, initializing it with `f` if the cellÁt‰ž was empty.Á žúü¬žC@ Many threads may call `get_or_init` concurrently with differentÁüøžGD initializing functions, but it is guaranteed that only one functionÁ¬ÈŸ will be executed.ÁæŸúdòŸ²•‡ úü“ FÖ•Ôâ ¦–…¡úü‘¡C@ It is an error to reentrantly initialize the cell from `f`. TheÁüÝ¡GD exact outcome is unspecified. Current implementation deadlocks, butÁü­¢
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