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PhantomDatao$z -2242.\*=" /EDnǃ$E )3: BAX: B@z_ E\E !Ӈa / Eǃ 3TFF F"$F a/E6FdG4G /GDGGFFSřǙșəʙ˙G*R{9 lFŃ,FFրE & )ċHH /$H,IH4H"VÜĜŜƜǜȜ_wր{nJcE3E'3¦MW7W WT_``Va`68Rt (_ _"$_ a(s6_j_"j] "   j_ f U %R  b jz    M.]IM] _N]M)]_^ 7^ /,^8 ^gB[ EqRۄz~ ˬ?\`L` (``8/$`WTaa  q**w w w #7M#7+3 kw %ÜĜŜƜǜȜ_wuz$wm +w  wlw 9 lw[ÜĜŜƜǜȜ_wt %ÜĜŜƜǜȜ_wa z Tx |xlx x x y xx  rYPA  xDy Dy y z zlz& y#$yz !Lz yz ,z R R'(R6RH WcRw (Rzv*; R RR   $! 3 ! B z a wwxy_"lw,v vm[}OD^!Za OnceCell {-* const fn new() -> OnceCell { ... }85 fn set(&self, value: T) -> Result<(), T> { ... }+( fn get(&self) -> Option<&T> { ... }, }< ```MJ Note that, like with [`RefCell`] and [`Mutex`], the `set` method requiresOL only a shared reference. Because of the single assignment restriction `get`=: can return a `&T` instead of `Ref` or `MutexGuard`.NK The `sync` flavor is thread-safe (that is, implements the [`Sync`] trait)," while the `unsync` one is not.52 [`unsync::OnceCell`]: unsync/struct.OnceCell.html1. [`sync::OnceCell`]: sync/struct.OnceCell.htmlGD [`RefCell`]: https://doc.rust-lang.org/std/cell/struct.RefCell.htmlC@ [`Mutex`]: https://doc.rust-lang.org/std/sync/struct.Mutex.htmlB? [`Sync`]: https://doc.rust-lang.org/std/marker/trait.Sync.html l # Recipes  96 `OnceCell` might be useful for a variety of patterns.  )& ## Safe Initialization of Global Data \  ```rust B? # #[cfg(any(feature = "std", feature = "critical-section"))] {  use std::{env, io};  " use once_cell::sync::OnceCell;   #[derive(Debug)]  pub struct Logger {t // ...,  85 static INSTANCE: OnceCell = OnceCell::new();   impl Logger { ,) pub fn global() -> &'static Logger { >; INSTANCE.get().expect("logger is not initialized")L  }  HE fn from_cli(args: env::Args) -> Result { // ...ĸ # Ok(Logger {})L,| fn main() {<9 let logger = Logger::from_cli(env::args()).unwrap();&# INSTANCE.set(logger).unwrap();-* // use `Logger::global()` from now on,< # }<# ## Lazy Initialized Global DataFC This is essentially the `lazy_static!` macro, but without a macro.\B1. use std::{sync::Mutex, collections::HashMap};">; fn global_data() -> &'static Mutex> {QN static INSTANCE: OnceCell>> = OnceCell::new();! INSTANCE.get_or_init(|| {'$ let mut m = HashMap::new();.+ m.insert(13, "Spica".to_string());/, m.insert(74, "Hoyten".to_string()); Mutex::new(m)T }),<<OL There are also the [`sync::Lazy`] and [`unsync::Lazy`] convenience types to streamline this pattern:\B1 use once_cell::sync::Lazy;JG static GLOBAL_DATA: Lazy>> = Lazy::new(|| {# let mut m = HashMap::new();*' m.insert(13, "Spica".to_string());+( m.insert(74, "Hoyten".to_string()); Mutex::new(m)< });|63 println!("{:?}", GLOBAL_DATA.lock().unwrap());,<<KH Note that the variable that holds `Lazy` is declared as `static`, *not*PM `const`. This is important: using `const` instead compiles, but works wrong.)& [`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;|  let ctx = vec![1, 2, 3];" let thunk = Lazy::new(|| {# ctx.iter().sum::()\ }); assert_eq!(*thunk, 6);,<LI If you need a lazy field in a struct, you probably should use `OnceCell`A> directly, because that will allow you to access `self` during initialization. \  ! use std::{fs, path::PathBuf};  $! use once_cell::unsync::OnceCell;  struct Ctx {  config_path: PathBuf,!! config: OnceCell,,!!t! impl Ctx {!B? pub fn get_config(&self) -> Result<&str, std::io::Error> {"63 let cfg = self.config.get_or_try_init(|| {"52 fs::read_to_string(&self.config_path)# })?;# Ok(cfg.as_str())L#,#<### ## Lazily Compiled Regex##HE This is a `regex!` macro which takes a string literal and returns an$63 *expression* that evaluates to a `&'static Regex`:$<$$ macro_rules! regex {%! ($re:literal $(,)?) => {{%b_ static RE: once_cell::sync::OnceCell = once_cell::sync::OnceCell::new();&>; RE.get_or_init(|| regex::Regex::new($re).unwrap())\& }};,&<&&&FC This macro can be useful to avoid the "compile regex on every loop' iteration" problem.'' ## Runtime `include_bytes!`''OL The `include_bytes` macro is useful to include test resources, but it slows(KH down test compilation a lot. An alternative is to load the resources atd) runtime:)<))B) use std::path::Path;**"** pub struct TestResource {* path: &'static str,*  cell: OnceCell>,,+++ impl TestResource {+>; pub const fn new(path: &'static str) -> TestResource {+85 TestResource { path, cell: OnceCell::new() }L,,&# pub fn bytes(&self) -> &[u8] {,&# self.cell.get_or_init(|| {-GD let dir = std::env::var("CARGO_MANIFEST_DIR").unwrap();-C@ let path = Path::new(dir.as_str()).join(self.path);.<9 std::fs::read(&path).unwrap_or_else(|_err| {.NK panic!("failed to load test resource: {}", path.display())/ })̰/ }).as_slice()L/,///NK static TEST_IMAGE: TestResource = TestResource::new("test_data/lena.png");0\0 #[test]0 fn test_sobel_filter() {0,) let rgb: &[u8] = TEST_IMAGE.bytes();t11 # drop(rgb);,1<1<111 ## `lateinit`11MJ `LateInit` type for delayed initialization. It is reminiscent of Kotlin's2IF `lateinit` keyword and allows construction of cyclic data structures:22<22B3"330- pub struct LateInit { cell: OnceCell }4̞4 impl LateInit {4&# pub fn init(&self, value: T) {41. assert!(self.cell.set(value).is_ok())L5,555%" impl Default for LateInit {5GD fn default() -> Self { LateInit { cell: OnceCell::default() } },666-* impl std::ops::Deref for LateInit {6 type Target = T;6 fn deref(&self) -> &T {7$! self.cell.get().unwrap()L7,777 #[derive(Default)]7 struct A<'a> {7 b: LateInit<&'a B<'a>>,,8888 struct B<'a> {8 a: LateInit<&'a A<'a>>,8888 fn build_cycle() {8 let a = A::default();9 let b = B::default();9 a.b.init(&b);9 b.a.init(&a);99 let _a = &a.b.a.b.a;,:<:<::̢: # Comparison with std::eb |`!Sync` types | Access Mode | Drawbacks |;eb |----------------------|------------------------|-----------------------------------------------|` | `T` | requires `T: Copy` for `get` |` | `RefMut` / `Ref` | may panic at runtime |=eb |`unsync::OnceCell` | `&T` | assignable only once |>>eb |`Sync` types | Access Mode | Drawbacks |?e@eb |`AtomicT` | `T` | works only with certain `Copy` types |@eb |`Mutex` | `MutexGuard` | may deadlock at runtime, may block the thread |Aeb |`sync::OnceCell` | `&T` | assignable only once, may block the thread |BBOL Technically, calling `get_or_init` will also cause a panic or a deadlock ifCPM it recursively calls itself. However, because the assignment can happen onlyCLI once, such cases should be more rare than equivalents with `RefCell` anddD `Mutex`.DD'$ # Minimum Supported `rustc` VersionDDLI If only the `std`, `alloc`, or `race` features are enabled, MSRV will beERO updated conservatively, supporting at least latest 8 versions of the compiler.FMJ When using other features, like `parking_lot`, MSRV might be updated moreFPM frequently, up to the latest stable. In both cases, increasing MSRV is *not*GOL considered a semver-breaking change and requires only a minor version bump.GH # Implementation detailsHH&# The implementation is based on theHMJ [`lazy_static`](https://github.com/rust-lang-nursery/lazy-static.rs/) andIA> [`lazy_cell`](https://github.com/indiv0/lazycell/) crates andIPM [`std::sync::Once`]. In some sense, `once_cell` just streamlines and unifies|J those APIs.JJNK To implement a sync flavor of `OnceCell`, this crates uses either a customKKH re-implementation of `std::sync::Once` or `parking_lot::Mutex`. This isKNK controlled by the `parking_lot` feature (disabled by default). PerformanceLLI is the same for both cases, but the `parking_lot` based `OnceCell` isL smaller by up to 16 bytes.MM This crate uses `unsafe`.MMLI [`std::sync::Once`]: https://doc.rust-lang.org/std/sync/struct.Once.htmlNdN # F.A.Q.NN/, **Should I use the sync or unsync flavor?**NNJG Because Rust compiler checks thread safety for you, it's impossible toOKH accidentally use `unsync` where `sync` is required. So, use `unsync` inOJG single-threaded code and `sync` in multi-threaded. It's easy to switchP96 between the two if code becomes multi-threaded later.PPDA At the moment, `unsync` has an additional benefit that reentrantQHE initialization causes a panic, which might be easier to debug than alQ deadlock.RR&# **Does this crate support async?**RR No, but you can useRJG [`async_once_cell`](https://crates.io/crates/async_once_cell) instead.SS)& **Does this crate support `no_std`?**SSJG Yes, but with caveats. `OnceCell` is a synchronization primitive whichTMJ _semantically_ relies on blocking. `OnceCell` guarantees that at most oneTMJ `f` will be called to compute the value. If two threads of execution callU85 `get_or_init` concurrently, one of them has to wait.UUMJ Waiting fundamentally requires OS support. Execution environment needs toVPM understand who waits on whom to prevent deadlocks due to priority inversion.WMJ You _could_ make code to compile by blindly using pure spinlocks, but theW+( runtime behavior would be subtly wrong.XXHE Given these constraints, `once_cell` provides the following options:XXPM - The `race` module provides similar, but distinct synchronization primitiveYMJ which is compatible with `no_std`. With `race`, the `f` function can beYNK called multiple times by different threads, but only one thread will winZ to install the value.ZNK - `critical-section` feature (with a `-`, not `_`) uses `critical_section`[ to implement blocking.[[! **Can I bring my own mutex?**[[OL There is [generic_once_cell](https://crates.io/crates/generic_once_cell) to\ allow just that.\\JG **Should I use `std::cell::OnceCell`, `once_cell`, or `lazy_static`?**]]PM If you can use `std` version (your MSRV is at least 1.70, and you don't need^PM extra features `once_cell` provides), use `std`. Otherwise, use `once_cell`.^ Don't use `lazy_static`.^^ # Related crates__LI * Most of this crate's functionality is available in `std` starting with_EB Rust 1.70. See `std::cell::OnceCell` and `std::sync::OnceLock`.`KH * [double-checked-cell](https://github.com/niklasf/double-checked-cell)`52 * [lazy-init](https://crates.io/crates/lazy-init)a30 * [lazycell](https://crates.io/crates/lazycell)a;8 * [mitochondria](https://crates.io/crates/mitochondria)b96 * [lazy_static](https://crates.io/crates/lazy_static)bA> * [async_once_cell](https://crates.io/crates/async_once_cell)cLI * [generic_once_cell](https://crates.io/crates/generic_once_cell) (bringc your own mutex)F;;< < a$04T2 RefUnwindSafel UnwindSafeT AtomicBoolTa AtomicPtrLaD$Thread4A|.]vxgi]4JL0(  ($($'&() $'A (l(T'') . T '  ' $%&' ( 'B 7T ('B +t  'B _$ kT '*IB!"!" * G #*7ě#*7Yd$%LNIK #### M$ '7B $/l ' ( $2< 'řǙșəʙ˙G*R{9  (B $+T'5Bq5!T!R"<"R"D"R"!t"4#d#4$T$Rl&4&4m;y2/01&4&..00a0.">řǙșəʙ˙G*R{9 AAA=U/'o%&D&..``Va`68Rt&$&..4',' 3322 4 5 Pz}<; Pz}<;457'','22  3(L(224(8(7#7($( (7B6 (6 78$(*7888878RRU7.\. 3řǙșəʙ˙G*R{9  #7#77B .K ,.$/29::::9:77?$7 347B 8 ; ,8 curr_queueT8:;<<<<;<7;;====;= RT@4@?ACAG/\A$ARB@@,A ?( A ADZ/\CLDRBBB,D A( D $D DJl/\JDJ BD EDEܚK,K#K#R,K C( K K Kactgf*' Single-threaded version of `OnceCell`.4gS}a$g0FI4Tg2FJgcFK gFLs,g"FNDerefMutDg"FOlhFQThFR$gg{}gGrt[]giPR?AmhDA A cell which can be written to only once. It is not thread safe.iiC@ Unlike [`std::cell::RefCell`], a `OnceCell` provides simple `&`i references to the contents.ijRO [`std::cell::RefCell`]: https://doc.rust-lang.org/std/cell/struct.RefCell.htmljlj # Exampleyhh y(y)yjj y)kk̛z$z()Bii k(S?zmm z)nopqrstx{|{!{ Creates a new empty cell.{)Blln|0|# Creates a new initialized cell.T|()BllvPA~}-* Gets a reference to the underlying value.~~(% Returns `None` if the cell is empty.~ )řǙșəʙ˙G*R{9  (Bl ~lo$~+Ё52 Gets a mutable reference to the underlying value.(˂ׂNK This method is allowed to violate the invariant of writing to a `OnceCell`IF at most once because it requires `&mut` access to `self`. As with allFC interior mutability, `&mut` access permits arbitrary modification:τ<ۄ$2/ let mut cell: OnceCell = OnceCell::new();߅ cell.set(92).unwrap();" *cell.get_mut().unwrap() = 93;&# assert_eq!(cell.get(), Some(&93));<܆< )řǙșəʙ˙G*R{9  (Bl lw$,.+ Sets the contents of this cell to `value`.߈EB Returns `Ok(())` if the cell was empty and `Err(value)` if it wasL full.ˉl׉<$ފ"%" assert_eq!(cell.set(92), Ok(()));Ë&# assert_eq!(cell.set(62), Err(62));"< )(Bl Čl$ŌH9RO Like [`set`](Self::set), but also returns a reference to the final cell value.ߎl<$ʏ"-* assert_eq!(cell.try_insert(92), Ok(&92));ߐ41 assert_eq!(cell.try_insert(62), Err((&92, 62)));"<ӑT )(ÜĜŜƜǜȜ_w ((Bl l$ MT;8 Gets the contents of the cell, initializing it with `f` if the cell was empty.d # Panics×FC If `f` panics, the panic is propagated to the caller, and the cellԒ remains uninitialized.EB It is an error to reentrantly initialize the cell from `f`. Doingԏ so results in a panic.l<ԙ$Ś(% let value = cell.get_or_init(|| 92); assert_eq!(value, &92);41 let value = cell.get_or_init(|| unreachable!());כΠ<\ )* (Bluu l lќ#*7( ݜ t(*$O=?L$Flm2'twwwwtΥq>; 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.ߟdFҝ۠EԞءl<$ڢ:7 assert_eq!(cell.get_or_try_init(|| Err(())), Err(()));ѣ"<9 let value = cell.get_or_try_init(|| -> Result {t Ok(92)<ؤރ assert_eq!(value, Ok(&92));%" assert_eq!(cell.get(), Some(&92))<|ե )*ÜĜŜƜǜȜ_w (GBlyzyz l  Ħd x(*G$V<>@B#UR Takes the value out of this `OnceCell`, moving it back to an uninitialized state.OL Has no effect and returns `None` if the `OnceCell` hasn't been initialized.ŬtѬ # Examples<$52 let mut cell: OnceCell = OnceCell::new();" assert_eq!(cell.take(), None);# let mut cell = OnceCell::new();ޮ+( cell.set("hello".to_string()).unwrap();74 assert_eq!(cell.take(), Some("hello".to_string()));ү! assert_eq!(cell.get(), None);<NIF<$ٲ2Ԡבó cell = OnceCell::new();<$ )5Bl l {($$ٴ96 Consumes the `OnceCell`, returning the wrapped value.)& Returns `None` if the cell was empty.ٵt<$ŶѶ1. let cell: OnceCell = OnceCell::new();(% assert_eq!(cell.into_inner(), None);ȷ+=: assert_eq!(cell.into_inner(), Some("hello".to_string()));<T)5BllY׾!52 A value which is initialized on the first access.ɻlѻ< Ȉ(% let lazy: Lazy = Lazy::new(|| {ɼ! println!("initializing");T 92<ރ println!("ready");ԥ println!("{}", *lazy);Ľt // Prints:t // ready // initializing\ // 92\<˾$~~ l* ]o)+- +$F}})$F}}W ſ ȿ*l˿)l*35790  T*g%')+4 * ggg cg7cثq1ȡ7B  (*$[  *'B? Creates a new lazy value with the given initializing function.l< # fn main() { Ȉ,) let hello = "Hello, World!".to_string();2/ let lazy = Lazy::new(|| hello.to_uppercase());(% assert_eq!(&*lazy, "HELLO, WORLD!");<<**B (*}^341 Consumes this `Lazy` returning the stored value.HE Returns `Ok(value)` if `Lazy` is initialized and `Err(f)` otherwise.T*B (*{nb$  l *35%GD Forces the evaluation of this lazy value and returns a reference to| the result.<9 This is equivalent to the `Deref` impl, but is explicit.l< Ȉ  let lazy = Lazy::new(|| 92);(% assert_eq!(Lazy::force(&lazy), &92); assert_eq!(&*lazy, &92);<, * (B {xe1OL Forces the evaluation of this lazy value and returns a mutable reference to|?< This is equivalent to the `DerefMut` impl, but is explicit.l< Ȉ$! let mut lazy = Lazy::new(|| 92);0- assert_eq!(Lazy::force_mut(&mut lazy), &92);ԓ assert_eq!(*lazy, 92);<L * (B {Hk+:7 Gets the reference to the result of this lazy value if1. it was initialized, otherwise returns `None`.l< Ȉ '$ assert_eq!(Lazy::get(&lazy), None);,) assert_eq!(Lazy::get(&lazy), Some(&92));< *řǙșəʙ˙G*R{9  (B  (*{Cm7B? Gets the mutable reference to the result of this lazy value if1l< Ȉ$/, assert_eq!(Lazy::get_mut(&mut lazy), None);85 assert_eq!(Lazy::get_mut(&mut lazy), Some(&mut 92));<< *řǙșəʙ˙G*R{9  (B  (*{m.  l *""9;\4(, * (B  (*$1  l *"24!L * (B  (*$$ (<+#%JG Creates a new lazy value using `Default` as the initializing function.<+B (d0- Thread-safe, blocking version of `OnceCell`.|/:$a$0c s,"D"lImp$T9uwbdTAN~96 A thread-safe cell which can be written to only once.KH `OnceCell` provides `&` references to the contents without RAII guards.>; Reading a non-`None` value out of `OnceCell` establishes aKH happens-before relationship with a corresponding write. For example, ifEB thread A initializes the cell with `get_or_init(f)`, and thread BLI subsequently reads the result of this call, B also observes all the side effects of `f`.l<"41 static CELL: OnceCell = OnceCell::new();" assert!(CELL.get().is_none());ܤ std::thread::spawn(|| {2/ let value: &String = CELL.get_or_init(|| {'$ "Hello, World!".to_string()\+( assert_eq!(value, "Hello, World!"); }).join().unwrap();,) let value: Option<&String> = CELL.get(); assert!(value.is_some());96 assert_eq!(value.unwrap().as_str(), "Hello, World!");<D +5Q1+^G'+B)N'+B (fh4' +<+B (. T+g4 + ggg cg7cثq1ȡ7B  ($q$ ,+'), ++B  ($'T + +7B  (${ v +̌$(+B (w, L+) + +B  ($  x + +,.!+B0#T(+By/, Gets the reference to the underlying value.C@ Returns `None` if the cell is empty, or being initialized. This method never blocks. +řǙșəʙ˙G*R{9  (B $ĦDA Gets the reference to the underlying value, blocking the current thread until it is set.<"85 let mut cell = std::sync::Arc::new(OnceCell::new());  let t = std::thread::spawn({0- let cell = std::sync::Arc::clone(&cell);%" move || cell.set(92).unwrap()<ރ2/ // Returns immediately, but might return None.$! let _value_or_none = cell.get();JG // Will return 92, but might block until the other thread does `.set`." let value: &u32 = cell.wait();ܳ assert_eq!(*value, 92);׃ t.join().unwrap();<|$ + (B  ($+74 Gets the mutable reference to the underlying value.LJ(NۈIF<"Êϊ2Ԋבܭ<ы< +řǙșəʙ˙G*R{9  (B $(ьFC Get the reference to the underlying value, without checking if theĠ cell is initialized.d͍ # SafetyFC Caller must ensure that the cell is in initialized state, and that?< the contents are acquired by (synchronized to) this thread.l + ( $,.EДLl<ɑّ"1. static CELL: OnceCell = OnceCell::new();ʒ|֒&# assert!(CELL.get().is_none()); std::thread::spawn(|| {ѓ-* assert_eq!(CELL.set(92), Ok(()));܇ }).join().unwrap();*' assert_eq!(CELL.set(62), Err(62));*' assert_eq!(CELL.get(), Some(&92));,<• +(B ƕ ($Ǖz9Rl<"ʘ֘"-ٙ4"<ߚT +(ÜĜŜƜǜȜ_w ((B $ȃTGD Gets the contents of the cell, initializing it with `f` if the cellt was empty.C@ Many threads may call `get_or_init` concurrently with differentGD initializing functions, but it is guaranteed that only one functionȟ will be executed.dFҝC@ It is an error to reentrantly initialize the cell from `f`. TheݡGD exact outcome is unspecified. Current implementation deadlocks, but1. this may be changed to a panic in the future.l<"ģУ(ܩΠͤ4܊Π<\ť +* (B ԥ ѥl  (*$ե13L$HZݦڊq>@d=: If `f` panics, the panic is propagated to the caller, and# the cell remains uninitialized.?< It is an error to reentrantly initialize the cell from `f`.<9 The exact outcome is unspecified. Current implementationʫ@= deadlocks, but this may be changed to a panic in the future.l<Ŭ":"<t׮<ރ%Ө<ԯ| +*ÜĜŜƜǜȜ_w (GB   ļdȰ (*G$l=?AC#UOt<"ӵߵ5ѭ"ȶԶ#ˮ+7!<NIF<κ"2ב<$ +5B  ($$A> Consumes the `OnceCell`, returning the wrapped value. Returnsý! `None` if the cell was empty.t<"׾1(״οڿ+=<T+5B!5ɶ85 This type is thread-safe and can be used in statics.l<" use std::collections::HashMap;?< static HASHMAP: Lazy> = Lazy::new(|| {!#*؂+L m<ރ|Ԩ println!("ready");/, println!("{:?}", HASHMAP.get(&13));ܟ+( println!("{:?}", HASHMAP.get(&74)); // Prints: // ready̥ // initializing // Some("Spica") // Some("Hoyten"),<$ l, )+- +$+$0  T,g%')+4 , ggg cg7cثq1ȡ7B  (*$ŎC  *$ +$,2468W  l+l,+-/1  ,$85 Creates a new lazy value with the given initializingl function.*,B (*34HT,B (*{$  l ,35%0- Forces the evaluation of this lazy value and96 returns a reference to the result. This is equivalent)& to the `Deref` impl, but is explicit.l< (<, , (B {}10ڶA> returns a mutable reference to the result. This is equivalent)ٷl<$41 assert_eq!(Lazy::force_mut(&mut lazy), &mut 92);<L , (B {7+:1l< ',< ,řǙșəʙ˙G*R{9  (B  (*{37:1l<$/8<< ,řǙșəʙ˙G*R{9  (B  (*{ӟ.  l ,""9;\4(, , (B  (*$1  l ,"24!L , (B  (*$$ <-J<-B (\47B dEB Thread-safe, non-blocking, "first one wins" flavor of `OnceCell`.FJIF If two threads race to initialize a type from the `race` module, theyJG don't block, execute initialization function together, but only one of them stores the result./, This module does not require `std` feature. # Atomic orderings85 All types in this module use `Acquire` and `Release`LI [atomic orderings](Ordering) for all their operations. While this is notPM strictly necessary for types other than `OnceBox`, it is useful for users asMJ it allows them to be certain that after `get` or `get_or_init` returns onJG one thread, any side-effects caused by the setter thread prior to themOL calling `set` or `get_or_init` will be made visible to that thread; withoutOL it, it's possible for it to appear as if they haven't happened yet from theMJ getter thread's perspective. This is an acceptable tradeoff to make sinceIF `Acquire` and `Release` have very little performance overhead on most# architectures versus `Relaxed`.ij$4 `L a AtomicUsize\ D 4T 2\!! NonZeroUsized <[ ܰ   (4 ˴  zLj.Ԝ.B) Gets the underlying value. .B $2KH Get the reference to the underlying value, without checking if the cell is initialized.dF?l .  $0d  RB   D7"8 .!!B? Returns `Ok(())` if the cell was empty and `Err(())` if it wasL!" .B "$"*%a#KH Gets the contents of the cell, initializing it with `f` if the cell wasT$ empty.$$LI If several threads concurrently run `get_or_init`, more than one `f` can%KH be called. 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once_cell::imp::Waiter>_RINvNtNtCsgxBkk5gSRhY_4core4sync6atomic11atomic_loadhECs83kOSXVsJ59_9once_cellatomic_load_RINvNtNtCsgxBkk5gSRhY_4core4sync6atomic12atomic_storehECs83kOSXVsJ59_9once_cellatomic_store_RINvNtNtCsgxBkk5gSRhY_4core4sync6atomic23atomic_compare_exchangeONtNtCs83kOSXVsJ59_9once_cell3imp6WaiterEB15_atomic_compare_exchange<*mut 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