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boc/aamos-ledger-rust/target/debug/deps/libyoke-e00e8f69447c8036.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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lib.rmeta/ 0 0 0 644 235928 `
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ˆ½ 4ˆü²¬ü™jg This crate provides [`Yoke<Y, C>`][Yoke], which allows one to "yoke" (attach) a zero-copy deserializedÁü„‡„ object (say, a [`Cow<'a, str>`](alloc::borrow::Cow)) to the source it was deserialized from, (say, an [`Rc<[u8]>`](alloc::rc::Rc)),ÁüŒif known in this crate as a "cart", producing a type that looks like `Yoke<Cow<'static, str>, Rc<[u8]>>`Áüö*' and can be moved around with impunity.Á¡úü¥fc Succinctly, this allows one to "erase" static lifetimes and turn them into dynamic ones, similarlyÁüŒTQ to how `dyn` allows one to "erase" static types and turn them into dynamic ones.ÁáúüåXU Most of the time the yokeable `Y` type will be some kind of zero-copy deserializableÁü¾ UR abstraction, potentially with an owned variant (like [`Cow`](alloc::borrow::Cow),Áü”
‚ [`ZeroVec`](https://docs.rs/zerovec), or an aggregate containing such types), and the cart `C` will be some smart pointer likeÁü— Ž‹ [`Box<T>`](alloc::boxed::Box), [`Rc<T>`](alloc::rc::Rc), or [`Arc<T>`](std::sync::Arc), potentially wrapped in an [`Option<T>`](Option).Á¦ úüª da The key behind this crate is [`Yoke::get()`], where calling [`.get()`][Yoke::get] on a type likeÁü�
a^ `Yoke<Cow<'static, str>, _>` will get you a short-lived `&'a Cow<'a, str>`, restricted to theÁüñ
pm lifetime of the borrow used during [`.get()`](Yoke::get). This is entirely safe since the `Cow` borrows fromÁüâro the cart type `C`, which cannot be interfered with as long as the `Yoke` is borrowed by [`.get()`](Yoke::get).ÁüÕif [`.get()`](Yoke::get) protects access by essentially reifying the erased lifetime to a safe local oneÁœ¿ when necessary.ÁÓúü×74 See the documentation of [`Yoke`] for more details.Á2D\x€×öíÍýÎÙ‡ýßPƒçÎï…ÑÍŒ†½ Å
ˆ½ Ø4ˆFIL¤ÔüË85 Types for optional pointers with niche optimization.Á„úüˆNK The main type is [`CartableOptionPointer`], which is like `Option<Rc>` butÁü×MJ with a niche so that the resulting `Yoke` has a niche. The following fourÁü¥74 types can be stored in the `CartableOptionPointer`:ÁÝú\á 1. `&T`Á|í 2. `Box<T>`Átý 3. `Rc<T>`Á|Œ 4. `Arc<T>`Áœúü OL These four types implement the sealed unsafe trait [`CartablePointerLike`].ÁüðKH In addition, all except `Box<T>` impl [`CloneableCartablePointerLike`],Áü¼@= which allows [`CartableOptionPointer`] to implement `Clone`.ÁdÜ ‰çl‰ï…»8\Û• »8– §<÷‰ StableDerefÁ\˜É4� 
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\Ù<Ý „ë4õ  Îìœë ʹʹ|†ü�:ü˜85 An object fully representable by a non-null pointer.ÁÑúdÕ # SafetyÁâú¼æ Implementer safety:Áþúü‚`] 1. `into_raw` transfers ownership of the values referenced by [`StableDeref`] to the caller,Áüã(% if there is ownership to transferÁüŒWT 2. `drop_raw` returns ownership back to the impl, if there is ownership to transferÁäúüè_\ Note: if `into_raw` returns the sentinel pointer, memory leaks may occur, but this will notÁüÈ  lead to undefined behaviour.ÁéúüíXU Note: the pointer `NonNull<Self::Raw>` may or may not be aligned and it should neverÁüÆVS be dereferenced. Rust allows unaligned pointers; see [`std::ptr::read_unaligned`].Áœ®ʹü�ØÒ¹\à ҹ4Ñʹ7®À,½À#ʹI®À>½À5ÍìÒ¹Lº†ÁDºüÞDA The raw type used for [`Self::into_raw`] and [`Self::drop_raw`].Á4­¿ü�(üÉ.+ Converts this pointer-like into a pointer.Á4‚D’Ò¹‰‰§‹‰ ïíe¼îËè¿*ŽÁ
Ò¹$›üÃ0ü½74 Drops any memory associated with this pointer-like.Áùúd�Û¹’ú”š Caller safety:Á±úü¹EB 1. The pointer MUST have been returned by this impl's `into_raw`.Áüƒ(% 2. The pointer MUST NOT be dangling.Á4¶D͟ó4
Ò¹‰ <Öü÷Bü÷?< An object that implements [`CartablePointerLike`] that alsoÁü·EB supports cloning without changing the address of referenced data.Áýúd�Û¹Žú¼’ü¹ªúü®KH 1. `addref_raw` must create a new owner such that an additional call toÁüú41 `drop_raw` does not create a dangling pointerÁü¯GD 2. `addref_raw` must not change the address of any referenced data.Áäˆʹü÷éÒ¹œ¦ʹ(ÀÊʹ4ÀÊ)ü¬2ìÀ Clones this pointer-like.ÁâúdêÛ¹ûú”ƒãÚúü¢E‹Äüì(ÚÄ4ŸT¶ŸÃ³4
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$ƒ2•M˜%ìüRü·QC@ Returns whether this instance is `None`. From the return value:ÁÿQúü‡R'$ - If `true`, the instance is `None`Áü³R63 - If `false`, the instance is a valid `SelectedRc`Á<ƒSÅ ÅË1! ‹S!
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,Ìx€†ýDÞÙ€‡‡ýP€‡ƒ»8\ú• €ˆ»8– €ˆ×ld–ÃÛ€‰r,³é!€Šö\Ò€‹œÏñóÌ–åü�/×dÅÉ|×»Ì쑼‹m„¨^ü¾OüÅ+üï;8 A Cow-like borrowed object "yoked" to its backing data.Á«úü¯GD This allows things like zero copy deserialized data to carry aroundÁü÷QN shared references to their backing buffer, by "erasing" their static lifetimeÁüÉ2/ and turning it into a dynamically managed one.Áüúü€C@ `Y` (the [`Yokeable`]) is the object containing the references,ÁüÄFC and will typically be of the form `Foo<'static>`. The `'static` isÁü‹ RO not the actual lifetime of the data, rather it is a convenient way to mark theÁüÞ (% erased lifetime and make it dynamic.Á‡
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YV the cart serves little purpose except to guarantee that `Y`'s references remain validÁüÀ da for as long as the yoke remains in memory (by calling the destructor at the appropriate moment).Á¥ úü© `] The primary constructor for [`Yoke`] is [`Yoke::attach_to_cart()`]. Several variants of thatÁüŠ
YV constructor are provided to serve numerous types of call sites and `Yoke` signatures.Áä
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c` The key behind this type is [`Yoke::get()`], where calling [`.get()`][Yoke::get] on a type likeÁüÌañªü®c` lifetime of the borrow used during `.get()`. This is entirely safe since the `Cow` borrows fromÁü’a^ the cart type `C`, which cannot be interfered with as long as the `Yoke` is borrowed by `.getÁüôa^ ()`. `.get()` protects access by essentially reifying the erased lifetime to a safe local oneÁœÖÄ®êúüîli Furthermore, there are various [`.map_project()`][Yoke::map_project] methods that allow turning a `Yoke`ÁüÛc` into another `Yoke` containing a different type that may contain elements of the original yokedÁü¿A> value. See the [`Yoke::map_project()`] docs for more details.Á�úü…\Y In general, `C` is a concrete type, but it is also possible for it to be a trait object.Áâúlæ
# ExampleÁôúüøQN For example, we can use this to store zero-copy deserialized data in a cache:ÁÊú\Î ```rustÁ¬Ú # use yoke::Yoke;Á´ð # use std::rc::Rc;Á܇ # use std::borrow::Cow;Áü£74 # fn load_from_cache(_filename: &str) -> Rc<[u8]> {ÁüÛ! # // dummy implementationÁüýKH # Rc::new([0x5, 0, 0, 0, 0, 0, 0, 0, 0x68, 0x65, 0x6c, 0x6c, 0x6f])Á<É # }ÁÑúüÕIF fn load_object(filename: &str) -> Yoke<Cow<'static, str>, Rc<[u8]>> {ÁüŸ52 let rc: Rc<[u8]> = load_from_cache(filename);ÁüÕOL Yoke::<Cow<'static, str>, Rc<[u8]>>::attach_to_cart(rc, |data: &[u8]| {Áü¥52 // essentially forcing a #[serde(borrow)]ÁüÛ>; Cow::Borrowed(bincode::deserialize(data).unwrap())ÁTš })Á,¥ }Á«úü¯/, let yoke = load_object("filename.bincode");Áüß'$ assert_eq!(&**yoke.get(), "hello");Áü‡52 assert!(matches!(yoke.get(), &Cow::Borrowed(_)));Á<½ ```Á$Ъ�”���Íìà7 ÕÍìæ7 îŽÙà7Ž¤Ø¦7Š+Ô[
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‹qüŸ<aª”¸¸½£ ¤<Í£ ½<·Ùà7·¤§<æ7\À<…æ<ø<¦7¹¼ÀÂQS«<\^ü¡R£ü‡=EB Construct a [`Yoke`] by yokeing an object to a cart in a closure.ÁÑ=úüÙ=QN The closure can read and write data outside of its scope, but data it returnsÁü¯><9 may borrow only from the argument passed to the closure.Áð>úüø>RO See also [`Yoke::try_attach_to_cart()`] to return a `Result` from the closure.ÁÏ?úü×?UR Call sites for this function may not compile pre-1.61; if this still happens, useÁü±@41 [`Yoke::attach_to_cart_badly()`] and file a bug.Áê@útò@ # ExamplesÁ…Aú<�A‡¢¬™A�›´³AŸ›ÜÎA¾›üîA7ã›üªB!¤œüÐBKÏœ< C£�¬Cúü´CIÀ�ü‚D5“žü¼DOÒžü�E5«ŸüÊE>êŸT�F± ,œFÄ ¦Fúü®FB? let yoke: Yoke<Cow<str>, _> = load_object("filename.bincode");ÁüõF'˜¡ü¡G5É¡<ÛG‡¢çGúüïG;8 Write the number of consumed bytes to a local variable:Á¯Hú<·H‡¢¬ÃH�›´ÝHŸ›ÜøH¾›ü˜I7ã›üÔI!¤œüúI?< # Rc::new([0x5, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0, 0, 0])Á<¾J£�ÊJúœÒJ fn load_object(Á¼êJ filename: &str,Áü†K52 ) -> (Yoke<Cow<'static, str>, Rc<[u8]>>, usize) {ÁüÀK5“žüúK$! let mut bytes_remaining = 0;Áü£L30 let bytes_remaining = &mut bytes_remaining;ÁüÛLGD let yoke = Yoke::<Cow<'static, str>, Rc<[u8]>>::attach_to_cart(Á|§M rc,ÁÜ»M |data: &[u8]| {ÁüÛMEB let mut d = postcard::Deserializer::from_bytes(data);Áü¥NEB let output = serde::Deserialize::deserialize(&mut d);ÁüïN?< *bytes_remaining = d.finalize().unwrap().len();Áü³O.+ Cow::Borrowed(output.unwrap())ÁtæO },ÁTùO );ÁüˆP  (yoke, *bytes_remaining)Á,­PÄ ·Púü¿PC@ let (yoke, bytes_remaining) = load_object("filename.postcard");Áü‡Q'˜¡ü³Q5É¡üíQ# assert_eq!(bytes_remaining, 3);Á<•R‡¢t¨Ræ7À·¦7µ—ººµ÷… ·R»–"À· »…æüÒUJ»À·ÌŘ"à7»Ûä€Vݳ<¼V
¹à7æ7À·…²s±¼sz|ÖUüä\Ôü©ZRO Construct a [`Yoke`] by yokeing an object to a cart. If an error occurs in theÁü€[@= deserializer function, the error is passed up to the caller.ÁÅ[úüÍ[U—¶ü§\85 [`Yoke::try_attach_to_cart_badly()`] and file a bug.Á”ë\æ7úìﵖ½—¾¾½µÍìêì þ\Íìúà �]¿–"úà ¿…æü»]U¿úÃÔɘ"Ö¿Ù¿Ú¿«Û¿ˆÜ¿Ý¿Þ¿ˆ‚†f|Â
à7¿Ûêìüé]'ݳ<°^
¼à7æ7êìúÃ…øx±yâäÞà¿]üÍcŽü¢b# Use [`Yoke::attach_to_cart()`].ÁÊbúüÒbda This was needed because the pre-1.61 compiler couldn't always handle the [`FnOnce`] trait bound.Ál»c¤Ôcæ7Á Á…æà7ÁÛ¦7µµ
Àà7æ7…{± {Šdü¾f«ü�e'$ Use [`Yoke::try_attach_to_cart()`].Á»eúüÃedúÊl¬fÄÅfæ7Ä Ä…æÖ¿Ù¿Ú¿«Û¿ˆÜ¿Ý¿Þ¿ˆ‚†f|Â
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Âà7æ7êì… |±|!#‚güŸh+ªÆ”ÈÆȽ£ ¤hÍ£ ½hÇÙà7Ǥ§h¦7ÉËÌÍÐÔÙAC«hLNü×q;üÑh1. Obtain a valid reference to the yokeable dataÁ‡iúü�iMJ This essentially transforms the lifetime of the internal yokeable data toÁ
be valid.ÁüóiJG For example, if you're working with a `Yoke<Cow<'static, T>, C>`, thisÁüÂj# will return an `&'a Cow<'a, T>`Áêjúlòj䙄kú\Œk횬œk�›´¶kŸ›ÜÑk¾›üñk7ã›ü­l!¤œüÓlKÏœ<£m£�,¯m #Áü¹mKH # fn load_object(filename: &str) -> Yoke<Cow<'static, str>, Rc<[u8]>> {Áü‰n74 # let rc: Rc<[u8]> = load_from_cache(filename);ÁüÅnQN # Yoke::<Cow<'static, str>, Rc<[u8]>>::attach_to_cart(rc, |data: &[u8]| {Áü›o@= # Cow::Borrowed(bincode::deserialize(data).unwrap())Ádào # })Á<ño£�ýoúü…pC@ // load_object() defined in the example at the top of this pageÁüÍpBƹü”q$! assert_eq!(yoke.get(), "hello");Á<½q‡¢ÞqÊ Ê¦7 Êà7ÊÛÅâqÅ Ö$êqüµt üÂr(% Get a reference to the backing cart.Áïrúü÷rXU This can be useful when building caches, etc. However, if you plan to store the cartÁüÔs\Y separately from the yoke, read the note of caution below in [`Yoke::into_backing_cart`].Ád¼tØ Ø¦7 Øæ7Å ÉtÅ©×$Êtü¢�#üöt@= Get the backing cart by value, dropping the yokeable object.Á»uúüÃu]Z **Caution:** Calling this method could cause information saved in the yokeable object butÁü¥v[X not the cart to be lost. Use this method only if the yokeable object cannot contain itsÁ¤…w own information.Ážwúl¦w䙸wúüÀwYV Good example: the yokeable object is only a reference, so no information can be lost.Ážxú<¦x‡¢œ²x use yoke::Yoke;ÁÊxúüÒx&# let local_data = "foo".to_owned();ÁüýxKH let yoke = Yoke::<&'static str, Box<String>>::attach_to_zero_copy_cart(ÁìÍy Box::new(local_data),Á4ïy );Áüúy# assert_eq!(*yoke.get(), "foo");Á¢zúĪz // Get back the cartÁüÇz(% let cart = yoke.into_backing_cart();Áôôz assert_eq!(&*cart, "foo");Á<—{‡¢£{úü«{@= Bad example: information specified in `.with_mut()` is lost.Áð{ú<ø{‡¢Ì„| use std::borrow::Cow;Áœ¢|Þߺ|úüÂ|&‡à”í| let mut yoke =Áü„}IF Yoke::<Cow<'static, str>, Box<String>>::attach_to_zero_copy_cart(ÁüÒ}! Box::new(local_data),ÁTø}€Âü‡~" assert_eq!(yoke.get(), "foo");Á®~úü¶~  // Override data in the cartÁÌÛ~ yoke.with_mut(|cow| {Áüù~# let mut_str = cow.to_mut();ÁÄ¡ mut_str.clear();Áü¾  mut_str.push_str("bar");Á<ã });Áüï" assert_eq!(yoke.get(), "bar");Á–€úÄž€ùáü»€(›âüè€)& assert_eq!(&*cart, "foo"); // WHOOPS!Á<–�‡¢Œ©�¦7æ7ÅÅ
Ìà7æ7Ø}ü��Lüå�74 Unsafe function for replacing the cart with anotherÁ¡‚úü©‚<9 This can be used for type-erasing the cart, for example.Áê‚údò‚Û¹ƒƒúü‹ƒTQ - References from the yokeable `Y` should still be valid for the lifetime of theÁìäƒ returned cart type `C`.Á†„úüŽ„^[ For the purpose of determining this, `Yoke` guarantees that references from the YokeableÁüñ„b_ `Y` into the cart `C` will never be references into its stack data, only heap data protectedÁüØ…eb by `StableDeref`. This does not necessarily mean that `C` implements `StableDeref`, rather thatÁü†eb any data referenced by `Y` must be accessed through a `StableDeref` impl on something `C` owns.Á¬‡úü´‡gd Concretely, this means that if `C = Option<Rc<T>>`, `Y` may contain references to the `T` but notÁ¤ ˆ anything else.Áü¹ˆ[X - Lifetimes inside C must not be lengthened, even if they are themselves contravariant.Áü™‰XU I.e., if C contains an `fn
fn slice(Áü½¢)& y: Yoke<&'static [u8], Rc<[u8]>>,Áüë¢:7 ) -> Result<Yoke<&'static str, Rc<[u8]>>, Utf8Error> {Áüª£@= y.try_map_project(move |bytes, _| str::from_utf8(bytes))Á,ï£Ä <ù£‡¢…¤úü�¤9ÛÖˤú<Ó¤‡¢üߤ!Ïüœ…¥–ý´�¥Ÿ›ü¸¥&‚ì,㥜Ôüí¥*óפœ¦ð‚Ôµ¦ bytes_1: &'a [u8],ÁÔÔ¦ÙØ,ó¦Ä ý¦úä…§˜Ùü¦§*¿ÙüÕ§:Œíü”¨A> bar.try_map_project(|bar, _| str::from_utf8(bar.bytes_1))Á,ڨĠä¨ú,쨜Ôüö¨5ˆÛü°© ÈÛüÕ©1óÛ”‹ª®Ü\¢ªÊÜ,²ªœÔü¼ª/îÜüðª<¨Ý”±«®Ü\È«ÊÜ,Ø«œÔüâ«1™Þü˜¬-ÕÞ\ʬÊÜ,Ú¬œÔüä¬1©ß|š­äßü®­8þß\ë­Ààüû­0Öà\°®ÊÜ<À®£�<Ì®‡¢|ß®¦7úã¹ü¡Œ—�–ŽŒ�Žü†ã ï®³É ò®Íìî¶ õ®�Ùí¨�¤²¯�–"úÃà7�Û• • – »8Fu\»Ÿ �³4üÓ¯��úüö˜"Ö¿Ù¿Ú¿«Û¿ˆÜ¿Ý¿Þ¿ˆ‚†f|Â
í¨�Ûî¶üº°&
‹à7æ7í¨úÃ±žBEHKEH¶¯ׯüº·¿üØ´JG This is similar to [`Yoke::try_map_project`], however it does not moveÁü§µR÷äþµúü†¶aáåüì¶IÍæ´Á·µèÅ®—Åüº’¡“—”–•”’•“ü�é ß·“é â·Íìä 巖ٗ¯–¤©¸øËlʸ—–"Å® ºà7—Û• • – »8Fu\»Ÿ —³4ü且—Å®Ñû˜"Ö¿Ù¿Ú¿«Û¿ˆÜ¿Ý¿Þ¿ˆ‚†f|Â
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‘à7æ7º—¯Å®äÂ$ï·±(¤,Ø·adgjdg­¸è¸üŽÀ³üÕ½PM This is similar to [`Yoke::map_project`], but it works around older versionsÁüª¾NK of Rust not being able to use `FnOnce` by using an explicit capture input.Áüý¾B? See [#1061](https://github.com/unicode-org/icu4x/issues/1061).ÁÄ¿úüÌ¿=: See the docs of [`Yoke::map_project`] for how this works.Áü•À!¦7’Ðœà7œÛ’Е • – »8Fu\»Ÿ œ³4í¨œÛتü¡™¥š™šü†ã ·ÀÍì’Ð ºÀ›Ùí¨›¤¬Â
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