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(*Ok k O   (+  (+E*+ E  (C+ C  (   OnceCell(Uninit)3   d   OnceCell3 ݅ "  4" ++6 7 +8f [d+""3 43ވ Ȉ    ۇ  d  (.+ f [ d( !  (  Ȉ  j$ +  f$jk fd      5 7 + jf [ [ kd+  I+(!I Ȉ  Ȉ [ f  f [  (  (N+ ( N     (N+ ( N ( (i+ ((!i  (ii+ (((!i(ah  (% d df h7dd (a i (  $(4?Y4?Yk?Y (Ȃa Ȃ5?Y  n?Y5?Y5?Yb)assertion failed: self.0.is_initialized()))3 5?Y š  ؃ d́7݁Ii77 k?Yn?Y75?Yd(ĉ &(ĉ ׉Tj k Tތ(ތ  %(ތWd͌Ìdތ7ތÌW  ( ޓԥ(  7( 7(7Ó˒֓ ֒(ݒ[(ޓ֒!ݒ!ޓ˒٘  (-- (sk?  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(e "!eUe # "e $#eUe $! e_eeeeee e dIe _aaaaaabdkde%ܿ` `*`zaa"Haa zaal c utyaa*a[aaazbbbbzbzcHcHc[dzd7d#dzddeeeUe Ue Ue Ue Ue e ``a a a  abd_ (+( (+(E a # OverviewG `once_cell` provides two new cell-like types, [`unsync::OnceCell`] andJM [`sync::OnceCell`]. A `OnceCell` might store arbitrary non-`Copy` types, can^PE be assigned to at most once and provides direct access to the storedHH contents. The core API looks *roughly* like this (and there's much moreK inside, read on!): ```rust,ignore impl OnceCell {* const fn new() -> OnceCell { ... }-5 fn set(&self, value: T) -> Result<(), T> { ... }8( fn get(&self) -> Option<&T> { ... }+ } ```J Note that, like with [`RefCell`] and [`Mutex`], the `set` method requiresML only a shared reference. Because of the single assignment restriction `get`O: can return a `&T` instead of `Ref` or `MutexGuard`.=K The `sync` flavor is thread-safe (that is, implements the [`Sync`] trait),N while the `unsync` one is not."2 [`unsync::OnceCell`]: unsync/struct.OnceCell.html5. [`sync::OnceCell`]: sync/struct.OnceCell.html1D [`RefCell`]: https://doc.rust-lang.org/std/cell/struct.RefCell.htmlG@ [`Mutex`]: https://doc.rust-lang.org/std/sync/struct.Mutex.htmlC? [`Sync`]: https://doc.rust-lang.org/std/marker/trait.Sync.htmlB  # Recipes  6 `OnceCell` might be useful for a variety of patterns. 9 & ## Safe Initialization of Global Data )  ```rust  use std::{env, io};   use once_cell::sync::OnceCell; "  #[derive(Debug)]  pub struct Logger {  // ...  5 static INSTANCE: OnceCell = OnceCell::new(); 8  impl Logger { ) pub fn global() -> &'static Logger { ,; INSTANCE.get().expect("logger is not initialized") > }  E fn from_cli(args: env::Args) -> Result { H // ...  # Ok(Logger {})   fn main() {9 let logger = Logger::from_cli(env::args()).unwrap();<# INSTANCE.set(logger).unwrap();&* // use `Logger::global()` from now on- ## Lazy Initialized Global Data#C This is essentially the `lazy_static!` macro, but without a macro.F . use std::{sync::Mutex, collections::HashMap};1"; fn global_data() -> &'static Mutex> {>N static INSTANCE: OnceCell>> = OnceCell::new();Q INSTANCE.get_or_init(|| {!$ let mut m = HashMap::new();'+ m.insert(13, "Spica".to_string());., m.insert(74, "Hoyten".to_string());/ Mutex::new(m) }) L There are also the [`sync::Lazy`] and [`unsync::Lazy`] convenience types toO streamline this pattern: ɭ1 use once_cell::sync::Lazy;G static GLOBAL_DATA: Lazy>> = Lazy::new(|| {J let mut m = HashMap::new();#' m.insert(13, "Spica".to_string());*( m.insert(74, "Hoyten".to_string());+ Mutex::new(m) });Ī3 println!("{:?}", GLOBAL_DATA.lock().unwrap());6H Note that the variable that holds `Lazy` is declared as `static`, *not*KM `const`. This is important: using `const` instead compiles, but works wrong.P& [`sync::Lazy`]: sync/struct.Lazy.html)* [`unsync::Lazy`]: unsync/struct.Lazy.html-# ## General purpose lazy evaluation&: Unlike `lazy_static!`, `Lazy` works with local variables.=  use once_cell::unsync::Lazy; Ī let ctx = vec![1, 2, 3];  let thunk = Lazy::new(|| {" ctx.iter().sum::()# });  assert_eq!(*thunk, 6);I If you need a lazy field in a struct, you probably should use `OnceCell`L> directly, because that will allow you to access `self` duringA initialization.  use std::{fs, path::PathBuf};!! use once_cell::unsync::OnceCell;$ struct Ctx { config_path: PathBuf, config: OnceCell,! impl Ctx {? pub fn get_config(&self) -> Result<&str, std::io::Error> {B3 let cfg = self.config.get_or_try_init(|| { 62 fs::read_to_string(&self.config_path) 5 })?;! Ok(cfg.as_str())!! !!! ## Lazily Compiled Regex!"E This is a `regex!` macro which takes a string literal and returns an"H3 *expression* that evaluates to a `&'static Regex`:"6## macro_rules! regex {# ($re:literal $(,)?) => {{#!_ static RE: once_cell::sync::OnceCell = once_cell::sync::OnceCell::new();#b; RE.get_or_init(|| regex::Regex::new($re).unwrap())$> }};$ %%%C This macro can be useful to avoid the "compile regex on every loop%F iteration" problem.%% ## Runtime `include_bytes!`%&L The `include_bytes` macro is useful to include test resources, but it slows&OH down test compilation a lot. An alternative is to load the resources at&K runtime:' '' use std::path::Path;'''"( pub struct TestResource {( path: &'static str,( cell: OnceCell>,( (( impl TestResource {(; pub const fn new(path: &'static str) -> TestResource {)>5 TestResource { path, cell: OnceCell::new() })8* # pub fn bytes(&self) -> &[u8] {*&# self.cell.get_or_init(|| {*&D let dir = std::env::var("CARGO_MANIFEST_DIR").unwrap();*G@ let path = Path::new(dir.as_str()).join(self.path);+C9 std::fs::read(&path).unwrap_or_else(|_err| {+<K panic!("failed to load test resource: {}", path.display()),N }), }).as_slice()-- --K static TEST_IMAGE: TestResource = TestResource::new("test_data/lena.png");-N. #[test].  fn test_sobel_filter() {.) let rgb: &[u8] = TEST_IMAGE.bytes();.,. # drop(rgb);./// ## `lateinit`//J `LateInit` type for delayed initialization. It is reminiscent of Kotlin's/MF `lateinit` keyword and allows construction of cyclic data structures:/I0000"0- pub struct LateInit { cell: OnceCell }001 impl LateInit {1# pub fn init(&self, value: T) {1&. assert!(self.cell.set(value).is_ok())112 22" impl Default for LateInit {2%D fn default() -> Self { LateInit { cell: OnceCell::default() } }2G33* impl std::ops::Deref for LateInit {3- type Target = T;3 fn deref(&self) -> &T {3! self.cell.get().unwrap()4$4 44 #[derive(Default)]4 struct A<'a> {4 b: LateInit<&'a B<'a>>,4555 struct B<'a> {5 a: LateInit<&'a A<'a>>5555 fn build_cycle() {5 let a = A::default();6 let b = B::default();6 a.b.init(&b);6 b.a.init(&a);66 let _a = &a.b.a.b.a;6777 # Comparison with std77b |`!Sync` types | Access Mode | Drawbacks |7eb |----------------------|------------------------|-----------------------------------------------|8eb |`Cell` | `T` | requires `T: Copy` for `get` |9eb |`RefCell` | `RefMut` / `Ref` | may panic at runtime |9eb |`unsync::OnceCell` | `&T` | assignable only once |:e;b |`Sync` types | Access Mode | Drawbacks |;e` | `MutexGuard` | may deadlock at runtime, may block the thread |=eb |`sync::OnceCell` | `&T` | assignable only once, may block the thread |>e?L Technically, calling `get_or_init` will also cause a panic or a deadlock if?OM it recursively calls itself. However, because the assignment can happen only@PI once, such cases should be more rare than equivalents with `RefCell` and@L `Mutex`.A A$ # Minimum Supported `rustc` VersionA'A< This crate's minimum supported `rustc` version is `1.56.0`.A?BK If only the `std` feature is enabled, MSRV will be updated conservatively,BNH supporting at least latest 8 versions of the compiler. When using otherCKK features, like `parking_lot`, MSRV might be updated more frequently, up toCNH the latest stable. In both cases, increasing MSRV is *not* considered aDK semver-breaking change.DE # Implementation detailsEE# The implementation is based on theE&J [`lazy_static`](https://github.com/rust-lang-nursery/lazy-static.rs/) andEM> [`lazy_cell`](https://github.com/indiv0/lazycell/) crates andFAM [`std::sync::Once`]. In some sense, `once_cell` just streamlines and unifiesFP those APIs.GGK To implement a sync flavor of `OnceCell`, this crates uses either a customGNH re-implementation of `std::sync::Once` or `parking_lot::Mutex`. This isHKK controlled by the `parking_lot` feature (disabled by default). PerformanceHNI is the same for both cases, but the `parking_lot` based `OnceCell` isIL smaller by up to 16 bytes.JJ This crate uses `unsafe`.JJI [`std::sync::Once`]: https://doc.rust-lang.org/std/sync/struct.Once.htmlJLK # F.A.Q.K K, **Should I use the sync or unsync flavor?**K/KG Because Rust compiler checks thread safety for you, it's impossible toKJH accidentally use `unsync` where `sync` is required. So, use `unsync` inLKG single-threaded code and `sync` in multi-threaded. It's easy to switchLJ6 between the two if code becomes multi-threaded later.M9MA At the moment, `unsync` has an additional benefit that reentrantNDE initialization causes a panic, which might be easier to debug than aNH deadlock.O O# **Does this crate support async?**O&O No, but you can useOG [`async_once_cell`](https://crates.io/crates/async_once_cell) instead.OJP& **Does this crate support `no_std`?**P)PG Yes, but with caveats. `OnceCell` is a synchronization primitive whichPJJ _semantically_ relies on blocking. `OnceCell` guarantees that at most oneQMJ `f` will be called to compute the value. If two threads of execution callQM5 `get_or_init` concurrently, one of them has to wait.R8SJ Waiting fundamentally requires OS support. Execution environment needs toSMM understand who waits on whom to prevent deadlocks due to priority inversion.SPJ You _could_ make code to compile by blindly using pure spinlocks, but theTM( runtime behavior would be subtly wrong.T+UE Given these constraints, `once_cell` provides the following options:UHUM - The `race` module provides similar, but distinct synchronization primitiveUPJ which is compatible with `no_std`. With `race`, the `f` function can beVMK called multiple times by different threads, but only one thread will winWN to install the value.WK - `critical-section` feature (with a `-`, not `_`) uses `critical_section`WN to implement blocking.XX **Can I bring my own mutex?**X!YL There is [generic_once_cell](https://crates.io/crates/generic_once_cell) toYO allow just that.YYG **Should I use `std::cell::OnceCell`, `once_cell`, or `lazy_static`?**YJZM If you can use `std` version (your MSRV is at least 1.70, and you don't needZPM extra features `once_cell` provides), use `std`. Otherwise, use `once_cell`.[P Don't use `lazy_static`.[\ # Related crates\\I * Most of this crate's functionality is available in `std` starting with\LB Rust 1.70. See `std::cell::OnceCell` and `std::sync::OnceLock`.\EH * [double-checked-cell](https://github.com/niklasf/double-checked-cell)]K2 * [lazy-init](https://crates.io/crates/lazy-init)^50 * [lazycell](https://crates.io/crates/lazycell)^38 * [mitochondria](https://crates.io/crates/mitochondria)^;6 * [lazy_static](https://crates.io/crates/lazy_static)_9> * [async_once_cell](https://crates.io/crates/async_once_cell)_AI * [generic_once_cell](https://crates.io/crates/generic_once_cell) (bring`L your own mutex)`E aaaccc cc ccc cc cc ccc cc c c:cc c imp_std.rsc cc()*+,-.29;> 4 " RefUnwindSafe @ UnwindSafe @ O D V D Thread;          0(((()(A@( @( ( .  (    ( $%&'   ( ( 7 ((!  + 7 7( a k 7 7(*K ! "!"*I*7*7Z  #### P7 7(7/ 7 7( 7(27 7( {-P 7(ҩ+ (5!! U""U""U"!":## :$$ U& &4@M/01&&..   !L~ m {-P;;; 쿫 y&&..DDODވDD't&&..:''332245C3C45''''22 33(( 22:(7)7((7 7)76(6 77(*788887s.\.77 73 {-P 77777.M./29::::9u7?77 73:78 ;8 curr_queue8 :;<<<<;w;;====;x@ @?ACAGAAA AzU@@AAzAAADZCCC D zUzBBDDDDDDJlJJJ JzzDDKKKsKsUK C(KKKKd' Single-threaded version of `OnceCell`.c*dR|d EH4d "EIdEEJmemd EKueEMDerefMuteENe @EPe @EQddddd d dddddeeeede e e e jA A cell which can be written to only once. It is not thread safe.eDf@ Unlike [`std::cell::RefCell`], a `OnceCell` provides simple `&`fC references to the contents.fgO [`std::cell::RefCell`]: https://doc.rust-lang.org/std/cell/struct.RefCell.htmlgRg # Exampleg hh$h let cell = OnceCell::new();h assert!(cell.get().is_none());h"i+ let value: &String = cell.get_or_init(|| {i. "Hello, World!".to_string()i#µi$ assert_eq!(value, "Hello, World!");i' assert!(cell.get().is_some());j"jjSSj)Hr.TjjkkERR5mAVVmm m )mmm.XXmn )mmnZZn)[nnnn)YY [(o.]]oG(o )^ooo4o777 7) 7GGGEGEGEG EGEG7EQ ! >S77\o\ ^(ooq$``q(q)abqqrr7 7))_r_ a(rs's 77 7) 7)7_s_ b(ssu,ddu((u )euuu"u77 7) 7)cvc e(vvvggv(v)vvwiiw)jwwww()hh j(!wxllx)mnopqrswz{xxx! Creates a new empty cell.xx)kky0 Creates a new initialized cell.y#y ()kkЋ!y{* Gets a reference to the underlying value.z-{% Returns `None` if the cell is empty.{({7 7) {-P 7(k{k{+2 Gets a mutable reference to the underlying value.~5(K This method is allowed to violate the invariant of writing to a `OnceCell`NF at most once because it requires `&mut` access to `self`. As with allIC interior mutability, `&mut` access permits arbitrary modification:F߁$/ let mut cell: OnceCell = OnceCell::new();2 cell.set(92).unwrap(); *cell.get_mut().unwrap() = 93;"# assert_eq!(cell.get(), Some(&93));&7 7) {-P 7(kkɉ,+ Sets the contents of this cell to `value`..B Returns `Ok(())` if the cell was empty and `Err(value)` if it wasE full.Ɇ ۆ $Ƈֲ"" assert_eq!(cell.set(92), Ok(()));%# assert_eq!(cell.set(62), Err(62));ӈ&"Љ7 7)(kԉkՉ!ۉ9O Like [`set`](Self::set), but also returns a reference to the final cell value.R $Όڌֲ"* assert_eq!(cell.try_insert(92), Ok(&92));-1 assert_eq!(cell.try_insert(62), Err((&92, 62)));4" 7 7)(   'w 7((kk!T8 Gets the contents of the cell, initializing it with `f`; if the cell was empty. # Panics ǔC If `f` panics, the panic is propagated to the caller, and the cellӔF remains uninitialized.ŕB It is an error to reentrantly initialize the cell from `f`. DoingѕE so results in a panic.–Ζ $% let value = cell.get_or_init(|| 92);՗( assert_eq!(value, &92);1 let value = cell.get_or_init(|| unreachable!());4 7 7)* 7(k ttk̙ *7( s(* EȴIMF@svvvvsޢq; Gets the contents of the cell, initializing it with `f` if>= the cell was empty. If the cell was empty and `f` failed, an@ error is returned.М FE $7 assert_eq!(cell.get_or_try_init(|| Err(())), Err(()));:ֲ"9 let value = cell.get_or_try_init(|| -> Result {< Ok(92)ѡµ assert_eq!(value, Ok(&92));" assert_eq!(cell.get(), Some(&92))%΢7 7)*   'w 7(Ik x yxyk̙£ w(*I#R Takes the value out of this `OnceCell`, moving it back to an uninitialized state.UL Has no effect and returns `None` if the `OnceCell` hasn't been initialized.Oթ # Examples$2 let mut cell: OnceCell = OnceCell::new();ͪ5 assert_eq!(cell.take(), None);" let mut cell = OnceCell::new();«#( cell.set("hello".to_string()).unwrap();+4 assert_eq!(cell.take(), Some("hello".to_string()));7 assert_eq!(cell.get(), None);!NIѮF$2 cell = OnceCell::new();Ӱ7 7)5kk z($6 Consumes the `OnceCell`, returning the wrapped value.9& Returns `None` if the cell was empty.)$ճ. let cell: OnceCell = OnceCell::new();1% assert_eq!(cell.into_inner(), None);(̴ش+: assert_eq!(cell.into_inner(), Some("hello".to_string()));= )5kk!2 A value which is initialized on the first access.5ٸ  % let lazy: Lazy = Lazy::new(|| {( println!("initializing");ٹ! 92 µ println!("ready"); println!("{}", *lazy);Ժ // Prints: // ready // initializing // 92 ˻ ۻ} ~}~ *ҦjgPb +E||)E||м6 ռؼ@*ۼ @) *ռռؼؼ0 Ľ *ĽĽ4777 7* 7GGGEGEGEG EGEG7EQ ! >S77 (* *'? Creates a new lazy value with the given initializing function.B  # fn main() { ) let hello = "Hello, World!".to_string();,/ let lazy = Lazy::new(|| hello.to_uppercase());2% assert_eq!(&*lazy, "HELLO, WORLD!");( # }** (*31 Consumes this `Lazy` returning the stored value.4E Returns `Ok(value)` if `Lazy` is initialized and `Err(f)` otherwise.H * (*$ ̙ *%D Forces the evaluation of this lazy value and returns a reference toG the result.9 This is equivalent to the `Deref` impl, but is explicit.<   let lazy = Lazy::new(|| 92); % assert_eq!(Lazy::force(&lazy), &92);( assert_eq!(&*lazy, &92);7 7* 7(ك1L Forces the evaluation of this lazy value and returns a mutable reference toO< This is equivalent to the `DerefMut` impl, but is explicit.?  ! let mut lazy = Lazy::new(|| 92);$- assert_eq!(Lazy::force_mut(&mut lazy), &92);0 assert_eq!(*lazy, 92); 7 7* 7(+7 Gets the reference to the result of this lazy value if:. it was initialized, otherwise returns `None`.1   $ assert_eq!(Lazy::get(&lazy), None);') assert_eq!(Lazy::get(&lazy), Some(&92));,7 7* {-P 7( (*7? Gets the mutable reference to the result of this lazy value ifB1  Ӆ$, assert_eq!(Lazy::get_mut(&mut lazy), None);/dž5 assert_eq!(Lazy::get_mut(&mut lazy), Some(&mut 92));87 7* {-P 7( (*. ̙ * (7 7* 7( (*1 ̙ *! 7 7* 7( (*$(*G Creates a new lazy value using `Default` as the initializing function.J* ( - Thread-safe, blocking version of `OnceCell`.0    : E u @Impq q 6 A thread-safe cell which can be written to only once.9H `OnceCell` provides `&` references to the contents without RAII guards.K; Reading a non-`None` value out of `OnceCell` establishes a>H happens-before relationship with a corresponding write. For example, ifKB thread A initializes the cell with `get_or_init(f)`, and thread BEI subsequently reads the result of this call, B also observes all the sideL effects of `f`. "1 static CELL: OnceCell = OnceCell::new();4 assert!(CELL.get().is_none());" std::thread::spawn(|| {/ let value: &String = CELL.get_or_init(|| {2$ "Hello, World!".to_string()'һ ( assert_eq!(value, "Hello, World!");+ }).join().unwrap();) let value: Option<&String> = CELL.get();, assert!(value.is_some());6 assert_eq!(value.unwrap().as_str(), "Hello, World!");9+oq(+(+ ((++ (. +4777 7+ 7GGGEGEGEG EGEG7EQ ! >S77 ($ѻ+7 7++ (' 77 7+ 7+7 (+(+ (!, +)77 7+ 7+ (Ŀ++!+ۇ0# (+!, Gets the reference to the underlying value./@ Returns `None` if the cell is empty, or being initialized. ThisC method never blocks.7 7+ {-P 7(ȈA Gets the reference to the underlying value, blocking the currentD thread until it is set."5 let mut cell = std::sync::Arc::new(OnceCell::new());8 let t = std::thread::spawn({ - let cell = std::sync::Arc::clone(&cell);0" move || cell.set(92).unwrap()%µ/ // Returns immediately, but might return None.2! let _value_or_none = cell.get();$G // Will return 92, but might block until the other thread does `.set`.J let value: &u32 = cell.wait();" assert_eq!(*value, 92);À t.join().unwrap();  7 7+ 7( (Á+4 Gets the mutable reference to the underlying value.7˄ׄ(NIF"Ӈ߇27 7+ {-P 7(ґ(C Get the reference to the underlying value, without checking if theF cell is initialized.ъ # Safety݊ C Caller must ensure that the cell is in initialized state, and thatF< the contents are acquired by (synchronized to) this thread.͋? 7 7+ 7(ÌšČ˒,.ˍE  َ͎". static CELL: OnceCell = OnceCell::new();1ڏĪ# assert!(CELL.get().is_none());& std::thread::spawn(|| {* assert_eq!(CELL.set(92), Ok(()));- }).join().unwrap();' assert_eq!(CELL.set(62), Err(62));Ǒ*' assert_eq!(CELL.get(), Some(&92));*Ғ7 7+(֒ (ג!ݒ9R $ܕֲ"ǖ-4Ɨ" 7 7+(   'w 7((!ТTD Gets the contents of the cell, initializing it with `f` if the cell˚G was empty.@ Many threads may call `get_or_init` concurrently with differentCD initializing functions, but it is guaranteed that only one functionG will be executed.ڜ F@ It is an error to reentrantly initialize the cell from `f`. TheCD exact outcome is unspecified. Current implementation deadlocks, butG. this may be changed to a panic in the future.1 "֠(ߡ4ע 7 7+* 7( ̙  (* VsT˸q>@ Ŧ: If `f` panics, the panic is propagated to the caller, andѦ= the cell remains uninitialized.#ç< It is an error to reentrantly initialize the cell from `f`.ϧ?9 The exact outcome is unspecified. Current implementation<= deadlocks, but this may be changed to a panic in the future.ܨ@ ǩש":ֲ"<µ%7 7+*   'w 7(I  ̙έڭ (*I#UO"5"ڳ#+ƴ7!̵NIFķз"2Ҹ7 7+5 ($> Consumes the `OnceCell`, returning the wrapped value. ReturnsA `None` if the cell was empty.պ!"1(+Ƚ= +5¾!5ƿ5 This type is thread-safe and can be used in statics.ο8  use std::collections::HashMap;"< static HASHMAP: Lazy> = Lazy::new(|| {?!#*+ m µĪ println!("ready");, println!("{:?}", HASHMAP.get(&13));/( println!("{:?}", HASHMAP.get(&74));+ // Prints: // ready // initializing // Some("Spica") // Some("Hoyten")  ,b|iL& ++0  ,4777 7, 7GGGEGEGEG EGEG7EQ ! >S77 (*+ *+,6  @+ , ,$5 Creates a new lazy value with the given initializing8 function. *, (*34H , (*$ ̙ ,%- Forces the evaluation of this lazy value and06 returns a reference to the result. This is equivalent9& to the `Deref` impl, but is explicit.)  (7 7, 7(10> returns a mutable reference to the result. This is equivalentA) Ӆ$1 assert_eq!(Lazy::force_mut(&mut lazy), &mut 92);4 7 7, 7(+:1  'ˊ,7 7, {-P 7( (*7:1 Ӆ$/87 7, {-P 7( (*. ̙ , (7 7, 7( (*1 ̙ ,! 7 7, 7( (*$,J, ( 7   B Thread-safe, non-blocking, "first one wins" flavor of `OnceCell`.EFF If two threads race to initialize a type from the `race` module, theyJIG don't block, execute initialization function together, but only one ofJ them stores the result., This module does not require `std` feature./ # Atomic orderings5 All types in this module use `Acquire` and `Release`8I [atomic orderings](Ordering) for all their operations. While this is notLM strictly necessary for types other than `OnceBox`, it is useful for users asPJ it allows them to be certain that after `get` or `get_or_init` returns onMG one thread, any side-effects caused by the setter thread prior to themJL calling `set` or `get_or_init` will be made visible to that thread; withoutOL it, it's possible for it to appear as if they haven't happened yet from theOJ getter thread's perspective. This is an acceptable tradeoff to make sinceMF `Acquire` and `Release` have very little performance overhead on mostI architectures versus `Relaxed`.# DV D\  4 "     H   *               - &  -̤ ) Gets the underlying value.  7 7-  8.? Returns `Ok(())` if the cell was empty and `Err(())` if it wasB 7 7-݇!aH Gets the contents of the cell, initializing it with `f` if the cell wasK empty. I If several threads concurrently run `get_or_init`, more than one `f` canLH be called. 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