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 <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/arc-swap-1.6.0/src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../arc_swap/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../arc_swap/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span>
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 </pre><pre class="rust"><code><span class="attribute">#![doc(test(attr(deny(warnings))))]
 #![warn(missing_docs)]
 #![cfg_attr(docsrs, feature(doc_cfg))]
 #![allow(deprecated)]

 </span><span class="doccomment">//! Making [`Arc`][Arc] itself atomic
 //!
 //! The [`ArcSwap`] type is a container for an `Arc` that can be changed atomically. Semantically,
 //! it is similar to something like `Atomic&lt;Arc&lt;T&gt;&gt;` (if there was such a thing) or
 //! `RwLock&lt;Arc&lt;T&gt;&gt;` (but without the need for the locking). It is optimized for read-mostly
 //! scenarios, with consistent performance characteristics.
 //!
 //! # Motivation
 //!
 //! There are many situations in which one might want to have some data structure that is often
 //! read and seldom updated. Some examples might be a configuration of a service, routing tables,
 //! snapshot of some data that is renewed every few minutes, etc.
 //!
 //! In all these cases one needs:
 //! * Being able to read the current value of the data structure, fast, often and concurrently from
 //!   many threads.
 //! * Using the same version of the data structure over longer period of time ‒ a query should be
 //!   answered by a consistent version of data, a packet should be routed either by an old or by a
 //!   new version of the routing table but not by a combination, etc.
 //! * Perform an update without disrupting the processing.
 //!
 //! The first idea would be to use [`RwLock&lt;T&gt;`][RwLock] and keep a read-lock for the whole time of
 //! processing. Update would, however, pause all processing until done.
 //!
 //! Better option would be to have [`RwLock&lt;Arc&lt;T&gt;&gt;`][RwLock]. Then one would lock, clone the [Arc]
 //! and unlock. This suffers from CPU-level contention (on the lock and on the reference count of
 //! the [Arc]) which makes it relatively slow. Depending on the implementation, an update may be
 //! blocked for arbitrary long time by a steady inflow of readers.
 //!
 //! ```rust
 //! # use std::sync::{Arc, RwLock};
 //! # use once_cell::sync::Lazy;
 //! # struct RoutingTable; struct Packet; impl RoutingTable { fn route(&amp;self, _: Packet) {} }
 //! static ROUTING_TABLE: Lazy&lt;RwLock&lt;Arc&lt;RoutingTable&gt;&gt;&gt; = Lazy::new(|| {
 //!     RwLock::new(Arc::new(RoutingTable))
 //! });
 //!
 //! fn process_packet(packet: Packet) {
 //!     let table = Arc::clone(&amp;ROUTING_TABLE.read().unwrap());
 //!     table.route(packet);
 //! }
 //! # fn main() { process_packet(Packet); }
 //! ```
 //!
 //! The [ArcSwap] can be used instead, which solves the above problems and has better performance
 //! characteristics than the [RwLock], both in contended and non-contended scenarios.
 //!
 //! ```rust
 //! # use arc_swap::ArcSwap;
 //! # use once_cell::sync::Lazy;
 //! # struct RoutingTable; struct Packet; impl RoutingTable { fn route(&amp;self, _: Packet) {} }
 //! static ROUTING_TABLE: Lazy&lt;ArcSwap&lt;RoutingTable&gt;&gt; = Lazy::new(|| {
 //!     ArcSwap::from_pointee(RoutingTable)
 //! });
 //!
 //! fn process_packet(packet: Packet) {
 //!     let table = ROUTING_TABLE.load();
 //!     table.route(packet);
 //! }
 //! # fn main() { process_packet(Packet); }
 //! ```
 //!
 //! # Crate contents
 //!
 //! At the heart of the crate there are [`ArcSwap`] and [`ArcSwapOption`] types, containers for an
 //! [`Arc`] and [`Option&lt;Arc&gt;`][Option].
 //!
 //! Technically, these are type aliases for partial instantiations of the [`ArcSwapAny`] type. The
 //! [`ArcSwapAny`] is more flexible and allows tweaking of many things (can store other things than
 //! [`Arc`]s, can configure the locking [`Strategy`]). For details about the tweaking, see the
 //! documentation of the [`strategy`] module and the [`RefCnt`] trait.
 //!
 //! The [`cache`] module provides means for speeding up read access of the contained data at the
 //! cost of delayed reclamation.
 //!
 //! The [`access`] module can be used to do projections into the contained data to separate parts
 //! of application from each other (eg. giving a component access to only its own part of
 //! configuration while still having it reloaded as a whole).
 //!
 //! # Before using
 //!
 //! The data structure is a bit niche. Before using, please check the
 //! [limitations and common pitfalls][docs::limitations] and the [performance
 //! characteristics][docs::performance], including choosing the right [read
 //! operation][docs::performance#read-operations].
 //!
 //! You can also get an inspiration about what&#39;s possible in the [common patterns][docs::patterns]
 //! section.
 //!
 //! # Examples
 //!
 //! ```rust
 //! use std::sync::Arc;
 //!
 //! use arc_swap::ArcSwap;
 //! use crossbeam_utils::thread;
 //!
 //! fn main() {
 //!     let config = ArcSwap::from(Arc::new(String::default()));
 //!     thread::scope(|scope| {
 //!         scope.spawn(|_| {
 //!             let new_conf = Arc::new(&quot;New configuration&quot;.to_owned());
 //!             config.store(new_conf);
 //!         });
 //!         for _ in 0..10 {
 //!             scope.spawn(|_| {
 //!                 loop {
 //!                     let cfg = config.load();
 //!                     if !cfg.is_empty() {
 //!                         assert_eq!(**cfg, &quot;New configuration&quot;);
 //!                         return;
 //!                     }
 //!                 }
 //!             });
 //!         }
 //!     }).unwrap();
 //! }
 //! ```
 //!
 //! [RwLock]: https://doc.rust-lang.org/std/sync/struct.RwLock.html

 </span><span class="kw">pub mod </span>access;
 <span class="kw">mod </span>as_raw;
 <span class="kw">pub mod </span>cache;
 <span class="kw">mod </span>compile_fail_tests;
 <span class="kw">mod </span>debt;
 <span class="kw">pub mod </span>docs;
 <span class="kw">mod </span>ref_cnt;
 <span class="attribute">#[cfg(feature = <span class="string">&quot;serde&quot;</span>)]
 </span><span class="kw">mod </span>serde;
 <span class="kw">pub mod </span>strategy;
 <span class="attribute">#[cfg(feature = <span class="string">&quot;weak&quot;</span>)]
 </span><span class="kw">mod </span>weak;

 <span class="kw">use </span>std::borrow::Borrow;
 <span class="kw">use </span>std::fmt::{Debug, Display, Formatter, <span class="prelude-ty">Result </span><span class="kw">as </span>FmtResult};
 <span class="kw">use </span>std::marker::PhantomData;
 <span class="kw">use </span>std::mem;
 <span class="kw">use </span>std::ops::Deref;
 <span class="kw">use </span>std::ptr;
 <span class="kw">use </span>std::sync::atomic::{AtomicPtr, Ordering};
 <span class="kw">use </span>std::sync::Arc;

 <span class="kw">use </span><span class="kw">crate</span>::access::{Access, Map};
 <span class="kw">pub use </span><span class="kw">crate</span>::as_raw::AsRaw;
 <span class="kw">pub use </span><span class="kw">crate</span>::cache::Cache;
 <span class="kw">pub use </span><span class="kw">crate</span>::ref_cnt::RefCnt;
 <span class="kw">use </span><span class="kw">crate</span>::strategy::hybrid::{DefaultConfig, HybridStrategy};
 <span class="kw">use </span><span class="kw">crate</span>::strategy::sealed::Protected;
 <span class="kw">use </span><span class="kw">crate</span>::strategy::{CaS, Strategy};
 <span class="kw">pub use </span><span class="kw">crate</span>::strategy::{DefaultStrategy, IndependentStrategy};

 <span class="doccomment">/// A temporary storage of the pointer.
 ///
 /// This guard object is returned from most loading methods (with the notable exception of
 /// [`load_full`](struct.ArcSwapAny.html#method.load_full)). It dereferences to the smart pointer
 /// loaded, so most operations are to be done using that.
 </span><span class="kw">pub struct </span>Guard&lt;T: RefCnt, S: Strategy&lt;T&gt; = DefaultStrategy&gt; {
     inner: S::Protected,
 }

 <span class="kw">impl</span>&lt;T: RefCnt, S: Strategy&lt;T&gt;&gt; Guard&lt;T, S&gt; {
     <span class="doccomment">/// Converts it into the held value.
     ///
     /// This, on occasion, may be a tiny bit faster than cloning the Arc or whatever is being held
     /// inside.
     </span><span class="comment">// Associated function on purpose, because of deref
     </span><span class="attribute">#[allow(clippy::wrong_self_convention)]
     #[inline]
     </span><span class="kw">pub fn </span>into_inner(lease: <span class="self">Self</span>) -&gt; T {
         lease.inner.into_inner()
     }

     <span class="doccomment">/// Create a guard for a given value `inner`.
     ///
     /// This can be useful on occasion to pass a specific object to code that expects or
     /// wants to store a Guard.
     ///
     /// # Example
     ///
     /// ```rust
     /// # use arc_swap::{ArcSwap, DefaultStrategy, Guard};
     /// # use std::sync::Arc;
     /// # let p = ArcSwap::from_pointee(42);
     /// // Create two guards pointing to the same object
     /// let g1 = p.load();
     /// let g2 = Guard::&lt;_, DefaultStrategy&gt;::from_inner(Arc::clone(&amp;*g1));
     /// # drop(g2);
     /// ```
     </span><span class="kw">pub fn </span>from_inner(inner: T) -&gt; <span class="self">Self </span>{
         Guard {
             inner: S::Protected::from_inner(inner),
         }
     }
 }

 <span class="kw">impl</span>&lt;T: RefCnt, S: Strategy&lt;T&gt;&gt; Deref <span class="kw">for </span>Guard&lt;T, S&gt; {
     <span class="kw">type </span>Target = T;
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>deref(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>T {
         <span class="self">self</span>.inner.borrow()
     }
 }

 <span class="kw">impl</span>&lt;T: RefCnt, S: Strategy&lt;T&gt;&gt; From&lt;T&gt; <span class="kw">for </span>Guard&lt;T, S&gt; {
     <span class="kw">fn </span>from(inner: T) -&gt; <span class="self">Self </span>{
         <span class="self">Self</span>::from_inner(inner)
     }
 }

 <span class="kw">impl</span>&lt;T: Default + RefCnt, S: Strategy&lt;T&gt;&gt; Default <span class="kw">for </span>Guard&lt;T, S&gt; {
     <span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
         <span class="self">Self</span>::from(T::default())
     }
 }

 <span class="kw">impl</span>&lt;T: Debug + RefCnt, S: Strategy&lt;T&gt;&gt; Debug <span class="kw">for </span>Guard&lt;T, S&gt; {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, formatter: <span class="kw-2">&amp;mut </span>Formatter) -&gt; FmtResult {
         <span class="self">self</span>.deref().fmt(formatter)
     }
 }

 <span class="kw">impl</span>&lt;T: Display + RefCnt, S: Strategy&lt;T&gt;&gt; Display <span class="kw">for </span>Guard&lt;T, S&gt; {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, formatter: <span class="kw-2">&amp;mut </span>Formatter) -&gt; FmtResult {
         <span class="self">self</span>.deref().fmt(formatter)
     }
 }

 <span class="doccomment">/// Comparison of two pointer-like things.
 </span><span class="comment">// A and B are likely to *be* references, or thin wrappers around that. Calling that with extra
 // reference is just annoying.
 </span><span class="attribute">#[allow(clippy::needless_pass_by_value)]
 </span><span class="kw">fn </span>ptr_eq&lt;Base, A, B&gt;(a: A, b: B) -&gt; bool
 <span class="kw">where
     </span>A: AsRaw&lt;Base&gt;,
     B: AsRaw&lt;Base&gt;,
 {
     <span class="kw">let </span>a = a.as_raw();
     <span class="kw">let </span>b = b.as_raw();
     ptr::eq(a, b)
 }

 <span class="doccomment">/// An atomic storage for a reference counted smart pointer like [`Arc`] or `Option&lt;Arc&gt;`.
 ///
 /// This is a storage where a smart pointer may live. It can be read and written atomically from
 /// several threads, but doesn&#39;t act like a pointer itself.
 ///
 /// One can be created [`from`] an [`Arc`]. To get the pointer back, use the
 /// [`load`](#method.load).
 ///
 /// # Note
 ///
 /// This is the common generic implementation. This allows sharing the same code for storing
 /// both `Arc` and `Option&lt;Arc&gt;` (and possibly other similar types).
 ///
 /// In your code, you most probably want to interact with it through the
 /// [`ArcSwap`](type.ArcSwap.html) and [`ArcSwapOption`](type.ArcSwapOption.html) aliases. However,
 /// the methods they share are described here and are applicable to both of them. That&#39;s why the
 /// examples here use `ArcSwap` ‒ but they could as well be written with `ArcSwapOption` or
 /// `ArcSwapAny`.
 ///
 /// # Type parameters
 ///
 /// * `T`: The smart pointer to be kept inside. This crate provides implementation for `Arc&lt;_&gt;` and
 ///   `Option&lt;Arc&lt;_&gt;&gt;` (`Rc` too, but that one is not practically useful). But third party could
 ///   provide implementations of the [`RefCnt`] trait and plug in others.
 /// * `S`: Chooses the [strategy] used to protect the data inside. They come with various
 ///   performance trade offs, the default [`DefaultStrategy`] is good rule of thumb for most use
 ///   cases.
 ///
 /// # Examples
 ///
 /// ```rust
 /// # use std::sync::Arc;
 /// # use arc_swap::ArcSwap;
 /// let arc = Arc::new(42);
 /// let arc_swap = ArcSwap::from(arc);
 /// assert_eq!(42, **arc_swap.load());
 /// // It can be read multiple times
 /// assert_eq!(42, **arc_swap.load());
 ///
 /// // Put a new one in there
 /// let new_arc = Arc::new(0);
 /// assert_eq!(42, *arc_swap.swap(new_arc));
 /// assert_eq!(0, **arc_swap.load());
 /// ```
 ///
 /// # Known bugs
 ///
 /// Currently, things like `ArcSwapAny&lt;Option&lt;Option&lt;Arc&lt;_&gt;&gt;&gt;&gt;` (notice the double Option) don&#39;t
 /// work properly. A proper solution is being looked into
 /// ([#81](https://github.com/vorner/arc-swap/issues)).
 ///
 /// [`Arc`]: https://doc.rust-lang.org/std/sync/struct.Arc.html
 /// [`from`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html#tymethod.from
 /// [`RefCnt`]: trait.RefCnt.html
 </span><span class="kw">pub struct </span>ArcSwapAny&lt;T: RefCnt, S: Strategy&lt;T&gt; = DefaultStrategy&gt; {
     <span class="comment">// Notes: AtomicPtr needs Sized
     </span><span class="doccomment">/// The actual pointer, extracted from the Arc.
     </span>ptr: AtomicPtr&lt;T::Base&gt;,

     <span class="doccomment">/// We are basically an Arc in disguise. Inherit parameters from Arc by pretending to contain
     /// it.
     </span>_phantom_arc: PhantomData&lt;T&gt;,

     <span class="doccomment">/// Strategy to protect the data.
     </span>strategy: S,
 }

 <span class="kw">impl</span>&lt;T: RefCnt, S: Default + Strategy&lt;T&gt;&gt; From&lt;T&gt; <span class="kw">for </span>ArcSwapAny&lt;T, S&gt; {
     <span class="kw">fn </span>from(val: T) -&gt; <span class="self">Self </span>{
         <span class="self">Self</span>::with_strategy(val, S::default())
     }
 }

 <span class="kw">impl</span>&lt;T: RefCnt, S: Strategy&lt;T&gt;&gt; Drop <span class="kw">for </span>ArcSwapAny&lt;T, S&gt; {
     <span class="kw">fn </span>drop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="kw">let </span>ptr = <span class="kw-2">*</span><span class="self">self</span>.ptr.get_mut();
         <span class="kw">unsafe </span>{
             <span class="comment">// To pay any possible debts
             </span><span class="self">self</span>.strategy.wait_for_readers(ptr, <span class="kw-2">&amp;</span><span class="self">self</span>.ptr);
             <span class="comment">// We are getting rid of the one stored ref count
             </span>T::dec(ptr);
         }
     }
 }

 <span class="kw">impl</span>&lt;T, S: Strategy&lt;T&gt;&gt; Debug <span class="kw">for </span>ArcSwapAny&lt;T, S&gt;
 <span class="kw">where
     </span>T: Debug + RefCnt,
 {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, formatter: <span class="kw-2">&amp;mut </span>Formatter) -&gt; FmtResult {
         formatter
             .debug_tuple(<span class="string">&quot;ArcSwapAny&quot;</span>)
             .field(<span class="kw-2">&amp;</span><span class="self">self</span>.load())
             .finish()
     }
 }

 <span class="kw">impl</span>&lt;T, S: Strategy&lt;T&gt;&gt; Display <span class="kw">for </span>ArcSwapAny&lt;T, S&gt;
 <span class="kw">where
     </span>T: Display + RefCnt,
 {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, formatter: <span class="kw-2">&amp;mut </span>Formatter) -&gt; FmtResult {
         <span class="self">self</span>.load().fmt(formatter)
     }
 }

 <span class="kw">impl</span>&lt;T: RefCnt + Default, S: Default + Strategy&lt;T&gt;&gt; Default <span class="kw">for </span>ArcSwapAny&lt;T, S&gt; {
     <span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
         <span class="self">Self</span>::new(T::default())
     }
 }

 <span class="kw">impl</span>&lt;T: RefCnt, S: Strategy&lt;T&gt;&gt; ArcSwapAny&lt;T, S&gt; {
     <span class="doccomment">/// Constructs a new storage.
     </span><span class="kw">pub fn </span>new(val: T) -&gt; <span class="self">Self
     </span><span class="kw">where
         </span>S: Default,
     {
         <span class="self">Self</span>::from(val)
     }

     <span class="doccomment">/// Constructs a new storage while customizing the protection strategy.
     </span><span class="kw">pub fn </span>with_strategy(val: T, strategy: S) -&gt; <span class="self">Self </span>{
         <span class="comment">// The AtomicPtr requires *mut in its interface. We are more like *const, so we cast it.
         // However, we always go back to *const right away when we get the pointer on the other
         // side, so it should be fine.
         </span><span class="kw">let </span>ptr = T::into_ptr(val);
         <span class="self">Self </span>{
             ptr: AtomicPtr::new(ptr),
             _phantom_arc: PhantomData,
             strategy,
         }
     }

     <span class="doccomment">/// Extracts the value inside.
     </span><span class="kw">pub fn </span>into_inner(<span class="kw-2">mut </span><span class="self">self</span>) -&gt; T {
         <span class="kw">let </span>ptr = <span class="kw-2">*</span><span class="self">self</span>.ptr.get_mut();
         <span class="comment">// To pay all the debts
         </span><span class="kw">unsafe </span>{ <span class="self">self</span>.strategy.wait_for_readers(ptr, <span class="kw-2">&amp;</span><span class="self">self</span>.ptr) };
         mem::forget(<span class="self">self</span>);
         <span class="kw">unsafe </span>{ T::from_ptr(ptr) }
     }

     <span class="doccomment">/// Loads the value.
     ///
     /// This makes another copy of the held pointer and returns it, atomically (it is
     /// safe even when other thread stores into the same instance at the same time).
     ///
     /// The method is lock-free and wait-free, but usually more expensive than
     /// [`load`](#method.load).
     </span><span class="kw">pub fn </span>load_full(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; T {
         Guard::into_inner(<span class="self">self</span>.load())
     }

     <span class="doccomment">/// Provides a temporary borrow of the object inside.
     ///
     /// This returns a proxy object allowing access to the thing held inside. However, there&#39;s
     /// only limited amount of possible cheap proxies in existence for each thread ‒ if more are
     /// created, it falls back to equivalent of [`load_full`](#method.load_full) internally.
     ///
     /// This is therefore a good choice to use for eg. searching a data structure or juggling the
     /// pointers around a bit, but not as something to store in larger amounts. The rule of thumb
     /// is this is suited for local variables on stack, but not in long-living data structures.
     ///
     /// # Consistency
     ///
     /// In case multiple related operations are to be done on the loaded value, it is generally
     /// recommended to call `load` just once and keep the result over calling it multiple times.
     /// First, keeping it is usually faster. But more importantly, the value can change between the
     /// calls to load, returning different objects, which could lead to logical inconsistency.
     /// Keeping the result makes sure the same object is used.
     ///
     /// ```rust
     /// # use arc_swap::ArcSwap;
     /// struct Point {
     ///     x: usize,
     ///     y: usize,
     /// }
     ///
     /// fn print_broken(p: &amp;ArcSwap&lt;Point&gt;) {
     ///     // This is broken, because the x and y may come from different points,
     ///     // combining into an invalid point that never existed.
     ///     println!(&quot;X: {}&quot;, p.load().x);
     ///     // If someone changes the content now, between these two loads, we
     ///     // have a problem
     ///     println!(&quot;Y: {}&quot;, p.load().y);
     /// }
     ///
     /// fn print_correct(p: &amp;ArcSwap&lt;Point&gt;) {
     ///     // Here we take a snapshot of one specific point so both x and y come
     ///     // from the same one.
     ///     let point = p.load();
     ///     println!(&quot;X: {}&quot;, point.x);
     ///     println!(&quot;Y: {}&quot;, point.y);
     /// }
     /// # let p = ArcSwap::from_pointee(Point { x: 10, y: 20 });
     /// # print_correct(&amp;p);
     /// # print_broken(&amp;p);
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>load(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Guard&lt;T, S&gt; {
         <span class="kw">let </span>protected = <span class="kw">unsafe </span>{ <span class="self">self</span>.strategy.load(<span class="kw-2">&amp;</span><span class="self">self</span>.ptr) };
         Guard { inner: protected }
     }

     <span class="doccomment">/// Replaces the value inside this instance.
     ///
     /// Further loads will yield the new value. Uses [`swap`](#method.swap) internally.
     </span><span class="kw">pub fn </span>store(<span class="kw-2">&amp;</span><span class="self">self</span>, val: T) {
         drop(<span class="self">self</span>.swap(val));
     }

     <span class="doccomment">/// Exchanges the value inside this instance.
     </span><span class="kw">pub fn </span>swap(<span class="kw-2">&amp;</span><span class="self">self</span>, new: T) -&gt; T {
         <span class="kw">let </span>new = T::into_ptr(new);
         <span class="comment">// AcqRel needed to publish the target of the new pointer and get the target of the old
         // one.
         //
         // SeqCst to synchronize the time lines with the group counters.
         </span><span class="kw">let </span>old = <span class="self">self</span>.ptr.swap(new, Ordering::SeqCst);
         <span class="kw">unsafe </span>{
             <span class="self">self</span>.strategy.wait_for_readers(old, <span class="kw-2">&amp;</span><span class="self">self</span>.ptr);
             T::from_ptr(old)
         }
     }

     <span class="doccomment">/// Swaps the stored Arc if it equals to `current`.
     ///
     /// If the current value of the `ArcSwapAny` equals to `current`, the `new` is stored inside.
     /// If not, nothing happens.
     ///
     /// The previous value (no matter if the swap happened or not) is returned. Therefore, if the
     /// returned value is equal to `current`, the swap happened. You want to do a pointer-based
     /// comparison to determine it.
     ///
     /// In other words, if the caller „guesses“ the value of current correctly, it acts like
     /// [`swap`](#method.swap), otherwise it acts like [`load_full`](#method.load_full) (including
     /// the limitations).
     ///
     /// The `current` can be specified as `&amp;Arc`, [`Guard`](struct.Guard.html),
     /// [`&amp;Guards`](struct.Guards.html) or as a raw pointer (but _not_ owned `Arc`). See the
     /// [`AsRaw`] trait.
     </span><span class="kw">pub fn </span>compare_and_swap&lt;C&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, current: C, new: T) -&gt; Guard&lt;T, S&gt;
     <span class="kw">where
         </span>C: AsRaw&lt;T::Base&gt;,
         S: CaS&lt;T&gt;,
     {
         <span class="kw">let </span>protected = <span class="kw">unsafe </span>{ <span class="self">self</span>.strategy.compare_and_swap(<span class="kw-2">&amp;</span><span class="self">self</span>.ptr, current, new) };
         Guard { inner: protected }
     }

     <span class="doccomment">/// Read-Copy-Update of the pointer inside.
     ///
     /// This is useful in read-heavy situations with several threads that sometimes update the data
     /// pointed to. The readers can just repeatedly use [`load`](#method.load) without any locking.
     /// The writer uses this method to perform the update.
     ///
     /// In case there&#39;s only one thread that does updates or in case the next version is
     /// independent of the previous one, simple [`swap`](#method.swap) or [`store`](#method.store)
     /// is enough. Otherwise, it may be needed to retry the update operation if some other thread
     /// made an update in between. This is what this method does.
     ///
     /// # Examples
     ///
     /// This will *not* work as expected, because between loading and storing, some other thread
     /// might have updated the value.
     ///
     /// ```rust
     /// # use std::sync::Arc;
     /// #
     /// # use arc_swap::ArcSwap;
     /// # use crossbeam_utils::thread;
     /// #
     /// let cnt = ArcSwap::from_pointee(0);
     /// thread::scope(|scope| {
     ///     for _ in 0..10 {
     ///         scope.spawn(|_| {
     ///            let inner = cnt.load_full();
     ///             // Another thread might have stored some other number than what we have
     ///             // between the load and store.
     ///             cnt.store(Arc::new(*inner + 1));
     ///         });
     ///     }
     /// }).unwrap();
     /// // This will likely fail:
     /// // assert_eq!(10, *cnt.load_full());
     /// ```
     ///
     /// This will, but it can call the closure multiple times to retry:
     ///
     /// ```rust
     /// # use arc_swap::ArcSwap;
     /// # use crossbeam_utils::thread;
     /// #
     /// let cnt = ArcSwap::from_pointee(0);
     /// thread::scope(|scope| {
     ///     for _ in 0..10 {
     ///         scope.spawn(|_| cnt.rcu(|inner| **inner + 1));
     ///     }
     /// }).unwrap();
     /// assert_eq!(10, *cnt.load_full());
     /// ```
     ///
     /// Due to the retries, you might want to perform all the expensive operations *before* the
     /// rcu. As an example, if there&#39;s a cache of some computations as a map, and the map is cheap
     /// to clone but the computations are not, you could do something like this:
     ///
     /// ```rust
     /// # use std::collections::HashMap;
     /// #
     /// # use arc_swap::ArcSwap;
     /// # use once_cell::sync::Lazy;
     /// #
     /// fn expensive_computation(x: usize) -&gt; usize {
     ///     x * 2 // Let&#39;s pretend multiplication is *really expensive expensive*
     /// }
     ///
     /// type Cache = HashMap&lt;usize, usize&gt;;
     ///
     /// static CACHE: Lazy&lt;ArcSwap&lt;Cache&gt;&gt; = Lazy::new(|| ArcSwap::default());
     ///
     /// fn cached_computation(x: usize) -&gt; usize {
     ///     let cache = CACHE.load();
     ///     if let Some(result) = cache.get(&amp;x) {
     ///         return *result;
     ///     }
     ///     // Not in cache. Compute and store.
     ///     // The expensive computation goes outside, so it is not retried.
     ///     let result = expensive_computation(x);
     ///     CACHE.rcu(|cache| {
     ///         // The cheaper clone of the cache can be retried if need be.
     ///         let mut cache = HashMap::clone(&amp;cache);
     ///         cache.insert(x, result);
     ///         cache
     ///     });
     ///     result
     /// }
     ///
     /// assert_eq!(42, cached_computation(21));
     /// assert_eq!(42, cached_computation(21));
     /// ```
     ///
     /// # The cost of cloning
     ///
     /// Depending on the size of cache above, the cloning might not be as cheap. You can however
     /// use persistent data structures ‒ each modification creates a new data structure, but it
     /// shares most of the data with the old one (which is usually accomplished by using `Arc`s
     /// inside to share the unchanged values). Something like
     /// [`rpds`](https://crates.io/crates/rpds) or [`im`](https://crates.io/crates/im) might do
     /// what you need.
     </span><span class="kw">pub fn </span>rcu&lt;R, F&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="kw-2">mut </span>f: F) -&gt; T
     <span class="kw">where
         </span>F: FnMut(<span class="kw-2">&amp;</span>T) -&gt; R,
         R: Into&lt;T&gt;,
         S: CaS&lt;T&gt;,
     {
         <span class="kw">let </span><span class="kw-2">mut </span>cur = <span class="self">self</span>.load();
         <span class="kw">loop </span>{
             <span class="kw">let </span>new = f(<span class="kw-2">&amp;</span>cur).into();
             <span class="kw">let </span>prev = <span class="self">self</span>.compare_and_swap(<span class="kw-2">&amp;*</span>cur, new);
             <span class="kw">let </span>swapped = ptr_eq(<span class="kw-2">&amp;*</span>cur, <span class="kw-2">&amp;*</span>prev);
             <span class="kw">if </span>swapped {
                 <span class="kw">return </span>Guard::into_inner(prev);
             } <span class="kw">else </span>{
                 cur = prev;
             }
         }
     }

     <span class="doccomment">/// Provides an access to an up to date projection of the carried data.
     ///
     /// # Motivation
     ///
     /// Sometimes, an application consists of components. Each component has its own configuration
     /// structure. The whole configuration contains all the smaller config parts.
     ///
     /// For the sake of separation and abstraction, it is not desirable to pass the whole
     /// configuration to each of the components. This allows the component to take only access to
     /// its own part.
     ///
     /// # Lifetimes &amp; flexibility
     ///
     /// This method is not the most flexible way, as the returned type borrows into the `ArcSwap`.
     /// To provide access into eg. `Arc&lt;ArcSwap&lt;T&gt;&gt;`, you can create the [`Map`] type directly. See
     /// the [`access`] module.
     ///
     /// # Performance
     ///
     /// As the provided function is called on each load from the shared storage, it should
     /// generally be cheap. It is expected this will usually be just referencing of a field inside
     /// the structure.
     ///
     /// # Examples
     ///
     /// ```rust
     /// use std::sync::Arc;
     ///
     /// use arc_swap::ArcSwap;
     /// use arc_swap::access::Access;
     ///
     /// struct Cfg {
     ///     value: usize,
     /// }
     ///
     /// fn print_many_times&lt;V: Access&lt;usize&gt;&gt;(value: V) {
     ///     for _ in 0..25 {
     ///         let value = value.load();
     ///         println!(&quot;{}&quot;, *value);
     ///     }
     /// }
     ///
     /// let shared = ArcSwap::from_pointee(Cfg { value: 0 });
     /// let mapped = shared.map(|c: &amp;Cfg| &amp;c.value);
     /// crossbeam_utils::thread::scope(|s| {
     ///     // Will print some zeroes and some twos
     ///     s.spawn(|_| print_many_times(mapped));
     ///     s.spawn(|_| shared.store(Arc::new(Cfg { value: 2 })));
     /// }).expect(&quot;Something panicked in a thread&quot;);
     /// ```
     </span><span class="kw">pub fn </span>map&lt;I, R, F&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, f: F) -&gt; Map&lt;<span class="kw-2">&amp;</span><span class="self">Self</span>, I, F&gt;
     <span class="kw">where
         </span>F: Fn(<span class="kw-2">&amp;</span>I) -&gt; <span class="kw-2">&amp;</span>R + Clone,
         <span class="self">Self</span>: Access&lt;I&gt;,
     {
         Map::new(<span class="self">self</span>, f)
     }
 }

 <span class="doccomment">/// An atomic storage for `Arc`.
 ///
 /// This is a type alias only. Most of its methods are described on
 /// [`ArcSwapAny`](struct.ArcSwapAny.html).
 </span><span class="kw">pub type </span>ArcSwap&lt;T&gt; = ArcSwapAny&lt;Arc&lt;T&gt;&gt;;

 <span class="kw">impl</span>&lt;T, S: Strategy&lt;Arc&lt;T&gt;&gt;&gt; ArcSwapAny&lt;Arc&lt;T&gt;, S&gt; {
     <span class="doccomment">/// A convenience constructor directly from the pointed-to value.
     ///
     /// Direct equivalent for `ArcSwap::new(Arc::new(val))`.
     </span><span class="kw">pub fn </span>from_pointee(val: T) -&gt; <span class="self">Self
     </span><span class="kw">where
         </span>S: Default,
     {
         <span class="self">Self</span>::from(Arc::new(val))
     }
 }

 <span class="doccomment">/// An atomic storage for `Option&lt;Arc&gt;`.
 ///
 /// This is very similar to [`ArcSwap`](type.ArcSwap.html), but allows storing NULL values, which
 /// is useful in some situations.
 ///
 /// This is a type alias only. Most of the methods are described on
 /// [`ArcSwapAny`](struct.ArcSwapAny.html). Even though the examples there often use `ArcSwap`,
 /// they are applicable to `ArcSwapOption` with appropriate changes.
 ///
 /// # Examples
 ///
 /// ```
 /// use std::sync::Arc;
 /// use arc_swap::ArcSwapOption;
 ///
 /// let shared = ArcSwapOption::from(None);
 /// assert!(shared.load_full().is_none());
 /// assert!(shared.swap(Some(Arc::new(42))).is_none());
 /// assert_eq!(42, **shared.load_full().as_ref().unwrap());
 /// ```
 </span><span class="kw">pub type </span>ArcSwapOption&lt;T&gt; = ArcSwapAny&lt;<span class="prelude-ty">Option</span>&lt;Arc&lt;T&gt;&gt;&gt;;

 <span class="kw">impl</span>&lt;T, S: Strategy&lt;<span class="prelude-ty">Option</span>&lt;Arc&lt;T&gt;&gt;&gt;&gt; ArcSwapAny&lt;<span class="prelude-ty">Option</span>&lt;Arc&lt;T&gt;&gt;, S&gt; {
     <span class="doccomment">/// A convenience constructor directly from a pointed-to value.
     ///
     /// This just allocates the `Arc` under the hood.
     ///
     /// # Examples
     ///
     /// ```rust
     /// use arc_swap::ArcSwapOption;
     ///
     /// let empty: ArcSwapOption&lt;usize&gt; = ArcSwapOption::from_pointee(None);
     /// assert!(empty.load().is_none());
     /// let non_empty: ArcSwapOption&lt;usize&gt; = ArcSwapOption::from_pointee(42);
     /// assert_eq!(42, **non_empty.load().as_ref().unwrap());
     /// ```
     </span><span class="kw">pub fn </span>from_pointee&lt;V: Into&lt;<span class="prelude-ty">Option</span>&lt;T&gt;&gt;&gt;(val: V) -&gt; <span class="self">Self
     </span><span class="kw">where
         </span>S: Default,
     {
         <span class="self">Self</span>::new(val.into().map(Arc::new))
     }

     <span class="doccomment">/// A convenience constructor for an empty value.
     ///
     /// This is equivalent to `ArcSwapOption::new(None)`.
     </span><span class="kw">pub fn </span>empty() -&gt; <span class="self">Self
     </span><span class="kw">where
         </span>S: Default,
     {
         <span class="self">Self</span>::new(<span class="prelude-val">None</span>)
     }
 }

 <span class="kw">impl</span>&lt;T&gt; ArcSwapOption&lt;T&gt; {
     <span class="doccomment">/// A const-fn equivalent of [empty].
     ///
     /// Just like [empty], this creates an `None`-holding `ArcSwapOption`. The [empty] is, however,
     /// more general ‒ this is available only for the default strategy, while [empty] is for any
     /// [Default]-constructible strategy (current or future one).
     ///
     /// [empty]: ArcSwapAny::empty
     ///
     /// # Examples
     ///
     /// ```rust
     /// # use std::sync::Arc;
     /// # use arc_swap::ArcSwapOption;
     /// static GLOBAL_DATA: ArcSwapOption&lt;usize&gt; = ArcSwapOption::const_empty();
     ///
     /// assert!(GLOBAL_DATA.load().is_none());
     /// GLOBAL_DATA.store(Some(Arc::new(42)));
     /// assert_eq!(42, **GLOBAL_DATA.load().as_ref().unwrap());
     /// ```
     </span><span class="kw">pub const fn </span>const_empty() -&gt; <span class="self">Self </span>{
         <span class="self">Self </span>{
             ptr: AtomicPtr::new(ptr::null_mut()),
             _phantom_arc: PhantomData,
             strategy: HybridStrategy {
                 _config: DefaultConfig,
             },
         }
     }
 }

 <span class="doccomment">/// An atomic storage that doesn&#39;t share the internal generation locks with others.
 ///
 /// This makes it bigger and it also might suffer contention (on the HW level) if used from many
 /// threads at once. On the other hand, it can&#39;t block writes in other instances.
 ///
 /// See the [`IndependentStrategy`] for further details.
 </span><span class="comment">// Being phased out. Will deprecate once we verify in production that the new strategy works fine.
 </span><span class="attribute">#[doc(hidden)]
 </span><span class="kw">pub type </span>IndependentArcSwap&lt;T&gt; = ArcSwapAny&lt;Arc&lt;T&gt;, IndependentStrategy&gt;;

 <span class="doccomment">/// Arc swap for the [Weak] pointer.
 ///
 /// This is similar to [ArcSwap], but it doesn&#39;t store [Arc], it stores [Weak]. It doesn&#39;t keep the
 /// data alive when pointed to.
 ///
 /// This is a type alias only. Most of the methods are described on the
 /// [`ArcSwapAny`](struct.ArcSwapAny.html).
 ///
 /// Needs the `weak` feature turned on.
 ///
 /// [Weak]: std::sync::Weak
 </span><span class="attribute">#[cfg(feature = <span class="string">&quot;weak&quot;</span>)]
 </span><span class="kw">pub type </span>ArcSwapWeak&lt;T&gt; = ArcSwapAny&lt;std::sync::Weak&lt;T&gt;&gt;;

 <span class="macro">macro_rules! </span>t {
     (<span class="macro-nonterminal">$name</span>: ident, <span class="macro-nonterminal">$strategy</span>: ty) =&gt; {
         <span class="attribute">#[cfg(test)]
         </span><span class="kw">mod </span><span class="macro-nonterminal">$name </span>{
             <span class="kw">use </span>std::panic;
             <span class="kw">use </span>std::sync::atomic::{<span class="self">self</span>, AtomicUsize};

             <span class="kw">use </span>adaptive_barrier::{Barrier, PanicMode};
             <span class="kw">use </span>crossbeam_utils::thread;

             <span class="kw">use super</span>::<span class="kw-2">*</span>;

             <span class="kw">const </span>ITERATIONS: usize = <span class="number">10</span>;

             <span class="attribute">#[allow(deprecated)] </span><span class="comment">// We use &quot;deprecated&quot; testing strategies in here.
             </span><span class="kw">type </span>As&lt;T&gt; = ArcSwapAny&lt;Arc&lt;T&gt;, <span class="macro-nonterminal">$strategy</span>&gt;;
             <span class="attribute">#[allow(deprecated)] </span><span class="comment">// We use &quot;deprecated&quot; testing strategies in here.
             </span><span class="kw">type </span>Aso&lt;T&gt; = ArcSwapAny&lt;<span class="prelude-ty">Option</span>&lt;Arc&lt;T&gt;&gt;, <span class="macro-nonterminal">$strategy</span>&gt;;

             <span class="doccomment">/// Similar to the one in doc tests of the lib, but more times and more intensive (we
             /// want to torture it a bit).
             </span><span class="attribute">#[test]
             #[cfg_attr(miri, ignore)] </span><span class="comment">// Takes like 1 or 2 infinities to run under miri
             </span><span class="kw">fn </span>publish() {
                 <span class="kw">const </span>READERS: usize = <span class="number">2</span>;
                 <span class="kw">for _ in </span><span class="number">0</span>..ITERATIONS {
                     <span class="kw">let </span>config = As::&lt;String&gt;::default();
                     <span class="kw">let </span>ended = AtomicUsize::new(<span class="number">0</span>);
                     thread::scope(|scope| {
                         <span class="kw">for _ in </span><span class="number">0</span>..READERS {
                             scope.spawn(|<span class="kw">_</span>| <span class="kw">loop </span>{
                                 <span class="kw">let </span>cfg = config.load_full();
                                 <span class="kw">if </span>!cfg.is_empty() {
                                     <span class="macro">assert_eq!</span>(<span class="kw-2">*</span>cfg, <span class="string">&quot;New configuration&quot;</span>);
                                     ended.fetch_add(<span class="number">1</span>, Ordering::Relaxed);
                                     <span class="kw">return</span>;
                                 }
                                 atomic::spin_loop_hint();
                             });
                         }
                         scope.spawn(|<span class="kw">_</span>| {
                             <span class="kw">let </span>new_conf = Arc::new(<span class="string">&quot;New configuration&quot;</span>.to_owned());
                             config.store(new_conf);
                         });
                     })
                     .unwrap();
                     <span class="macro">assert_eq!</span>(READERS, ended.load(Ordering::Relaxed));
                     <span class="kw">let </span>arc = config.load_full();
                     <span class="macro">assert_eq!</span>(<span class="number">2</span>, Arc::strong_count(<span class="kw-2">&amp;</span>arc));
                     <span class="macro">assert_eq!</span>(<span class="number">0</span>, Arc::weak_count(<span class="kw-2">&amp;</span>arc));
                 }
             }

             <span class="doccomment">/// Similar to the doc tests of ArcSwap, but happens more times.
             </span><span class="attribute">#[test]
             </span><span class="kw">fn </span>swap_load() {
                 <span class="kw">for _ in </span><span class="number">0</span>..<span class="number">100 </span>{
                     <span class="kw">let </span>arc = Arc::new(<span class="number">42</span>);
                     <span class="kw">let </span>arc_swap = As::from(Arc::clone(<span class="kw-2">&amp;</span>arc));
                     <span class="macro">assert_eq!</span>(<span class="number">42</span>, <span class="kw-2">**</span>arc_swap.load());
                     <span class="comment">// It can be read multiple times
                     </span><span class="macro">assert_eq!</span>(<span class="number">42</span>, <span class="kw-2">**</span>arc_swap.load());

                     <span class="comment">// Put a new one in there
                     </span><span class="kw">let </span>new_arc = Arc::new(<span class="number">0</span>);
                     <span class="macro">assert_eq!</span>(<span class="number">42</span>, <span class="kw-2">*</span>arc_swap.swap(Arc::clone(<span class="kw-2">&amp;</span>new_arc)));
                     <span class="macro">assert_eq!</span>(<span class="number">0</span>, <span class="kw-2">**</span>arc_swap.load());
                     <span class="comment">// One loaded here, one in the arc_swap, one in new_arc
                     </span><span class="kw">let </span>loaded = arc_swap.load_full();
                     <span class="macro">assert_eq!</span>(<span class="number">3</span>, Arc::strong_count(<span class="kw-2">&amp;</span>loaded));
                     <span class="macro">assert_eq!</span>(<span class="number">0</span>, Arc::weak_count(<span class="kw-2">&amp;</span>loaded));
                     <span class="comment">// The original got released from the arc_swap
                     </span><span class="macro">assert_eq!</span>(<span class="number">1</span>, Arc::strong_count(<span class="kw-2">&amp;</span>arc));
                     <span class="macro">assert_eq!</span>(<span class="number">0</span>, Arc::weak_count(<span class="kw-2">&amp;</span>arc));
                 }
             }

             <span class="doccomment">/// Two different writers publish two series of values. The readers check that it is
             /// always increasing in each serie.
             ///
             /// For performance, we try to reuse the threads here.
             </span><span class="attribute">#[test]
             </span><span class="kw">fn </span>multi_writers() {
                 <span class="kw">let </span>first_value = Arc::new((<span class="number">0</span>, <span class="number">0</span>));
                 <span class="kw">let </span>shared = As::from(Arc::clone(<span class="kw-2">&amp;</span>first_value));
                 <span class="kw">const </span>WRITER_CNT: usize = <span class="number">2</span>;
                 <span class="kw">const </span>READER_CNT: usize = <span class="number">3</span>;
                 <span class="attribute">#[cfg(miri)]
                 </span><span class="kw">const </span>ITERATIONS: usize = <span class="number">5</span>;
                 <span class="attribute">#[cfg(not(miri))]
                 </span><span class="kw">const </span>ITERATIONS: usize = <span class="number">100</span>;
                 <span class="kw">const </span>SEQ: usize = <span class="number">50</span>;
                 <span class="kw">let </span>barrier = Barrier::new(PanicMode::Poison);
                 thread::scope(|scope| {
                     <span class="kw">for </span>w <span class="kw">in </span><span class="number">0</span>..WRITER_CNT {
                         <span class="comment">// We need to move w into the closure. But we want to just reference the
                         // other things.
                         </span><span class="kw">let </span><span class="kw-2">mut </span>barrier = barrier.clone();
                         <span class="kw">let </span>shared = <span class="kw-2">&amp;</span>shared;
                         <span class="kw">let </span>first_value = <span class="kw-2">&amp;</span>first_value;
                         scope.spawn(<span class="kw">move </span>|<span class="kw">_</span>| {
                             <span class="kw">for _ in </span><span class="number">0</span>..ITERATIONS {
                                 barrier.wait();
                                 shared.store(Arc::clone(<span class="kw-2">&amp;</span>first_value));
                                 barrier.wait();
                                 <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..SEQ {
                                     shared.store(Arc::new((w, i + <span class="number">1</span>)));
                                 }
                             }
                         });
                     }
                     <span class="kw">for _ in </span><span class="number">0</span>..READER_CNT {
                         <span class="kw">let </span><span class="kw-2">mut </span>barrier = barrier.clone();
                         <span class="kw">let </span>shared = <span class="kw-2">&amp;</span>shared;
                         <span class="kw">let </span>first_value = <span class="kw-2">&amp;</span>first_value;
                         scope.spawn(<span class="kw">move </span>|<span class="kw">_</span>| {
                             <span class="kw">for _ in </span><span class="number">0</span>..ITERATIONS {
                                 barrier.wait();
                                 barrier.wait();
                                 <span class="kw">let </span><span class="kw-2">mut </span>previous = [<span class="number">0</span>; WRITER_CNT];
                                 <span class="kw">let </span><span class="kw-2">mut </span>last = Arc::clone(<span class="kw-2">&amp;</span>first_value);
                                 <span class="kw">loop </span>{
                                     <span class="kw">let </span>cur = shared.load();
                                     <span class="kw">if </span>Arc::ptr_eq(<span class="kw-2">&amp;</span>last, <span class="kw-2">&amp;</span>cur) {
                                         atomic::spin_loop_hint();
                                         <span class="kw">continue</span>;
                                     }
                                     <span class="kw">let </span>(w, s) = <span class="kw-2">**</span>cur;
                                     <span class="macro">assert!</span>(previous[w] &lt; s, <span class="string">&quot;{:?} vs {:?}&quot;</span>, previous, cur);
                                     previous[w] = s;
                                     last = Guard::into_inner(cur);
                                     <span class="kw">if </span>s == SEQ {
                                         <span class="kw">break</span>;
                                     }
                                 }
                             }
                         });
                     }

                     drop(barrier);
                 })
                 .unwrap();
             }

             <span class="attribute">#[test]
             </span><span class="kw">fn </span>load_null() {
                 <span class="kw">let </span>shared = Aso::&lt;usize&gt;::default();
                 <span class="kw">let </span>guard = shared.load();
                 <span class="macro">assert!</span>(guard.is_none());
                 shared.store(<span class="prelude-val">Some</span>(Arc::new(<span class="number">42</span>)));
                 <span class="macro">assert_eq!</span>(<span class="number">42</span>, <span class="kw-2">**</span>shared.load().as_ref().unwrap());
             }

             <span class="attribute">#[test]
             </span><span class="kw">fn </span>from_into() {
                 <span class="kw">let </span>a = Arc::new(<span class="number">42</span>);
                 <span class="kw">let </span>shared = As::new(a);
                 <span class="kw">let </span>guard = shared.load();
                 <span class="kw">let </span>a = shared.into_inner();
                 <span class="macro">assert_eq!</span>(<span class="number">42</span>, <span class="kw-2">*</span>a);
                 <span class="macro">assert_eq!</span>(<span class="number">2</span>, Arc::strong_count(<span class="kw-2">&amp;</span>a));
                 drop(guard);
                 <span class="macro">assert_eq!</span>(<span class="number">1</span>, Arc::strong_count(<span class="kw-2">&amp;</span>a));
             }

             <span class="comment">// Note on the Relaxed order here. This should be enough, because there&#39;s that
             // barrier.wait in between that should do the synchronization of happens-before for us.
             // And using SeqCst would probably not help either, as there&#39;s nothing else with SeqCst
             // here in this test to relate it to.
             </span><span class="attribute">#[derive(Default)]
             </span><span class="kw">struct </span>ReportDrop(Arc&lt;AtomicUsize&gt;);
             <span class="kw">impl </span>Drop <span class="kw">for </span>ReportDrop {
                 <span class="kw">fn </span>drop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
                     <span class="self">self</span>.<span class="number">0</span>.fetch_add(<span class="number">1</span>, Ordering::Relaxed);
                 }
             }

             <span class="doccomment">/// Interaction of two threads about a guard and dropping it.
             ///
             /// We make sure everything works in timely manner (eg. dropping of stuff) even if multiple
             /// threads interact.
             ///
             /// The idea is:
             /// * Thread 1 loads a value.
             /// * Thread 2 replaces the shared value. The original value is not destroyed.
             /// * Thread 1 drops the guard. The value is destroyed and this is observable in both threads.
             </span><span class="attribute">#[test]
             </span><span class="kw">fn </span>guard_drop_in_thread() {
                 <span class="kw">for _ in </span><span class="number">0</span>..ITERATIONS {
                     <span class="kw">let </span>cnt = Arc::new(AtomicUsize::new(<span class="number">0</span>));

                     <span class="kw">let </span>shared = As::from_pointee(ReportDrop(cnt.clone()));
                     <span class="macro">assert_eq!</span>(cnt.load(Ordering::Relaxed), <span class="number">0</span>, <span class="string">&quot;Dropped prematurely&quot;</span>);
                     <span class="comment">// We need the threads to wait for each other at places.
                     </span><span class="kw">let </span>sync = Barrier::new(PanicMode::Poison);

                     thread::scope(|scope| {
                         scope.spawn({
                             <span class="kw">let </span>sync = sync.clone();
                             |<span class="kw">_</span>| {
                                 <span class="kw">let </span><span class="kw-2">mut </span>sync = sync; <span class="comment">// Move into the closure
                                 </span><span class="kw">let </span>guard = shared.load();
                                 sync.wait();
                                 <span class="comment">// Thread 2 replaces the shared value. We wait for it to confirm.
                                 </span>sync.wait();
                                 drop(guard);
                                 <span class="macro">assert_eq!</span>(cnt.load(Ordering::Relaxed), <span class="number">1</span>, <span class="string">&quot;Value not dropped&quot;</span>);
                                 <span class="comment">// Let thread 2 know we already dropped it.
                                 </span>sync.wait();
                             }
                         });

                         scope.spawn(|<span class="kw">_</span>| {
                             <span class="kw">let </span><span class="kw-2">mut </span>sync = sync;
                             <span class="comment">// Thread 1 loads, we wait for that
                             </span>sync.wait();
                             shared.store(Default::default());
                             <span class="macro">assert_eq!</span>(
                                 cnt.load(Ordering::Relaxed),
                                 <span class="number">0</span>,
                                 <span class="string">&quot;Dropped while still in use&quot;
                             </span>);
                             <span class="comment">// Let thread 2 know we replaced it
                             </span>sync.wait();
                             <span class="comment">// Thread 1 drops its guard. We wait for it to confirm.
                             </span>sync.wait();
                             <span class="macro">assert_eq!</span>(cnt.load(Ordering::Relaxed), <span class="number">1</span>, <span class="string">&quot;Value not dropped&quot;</span>);
                         });
                     })
                     .unwrap();
                 }
             }

             <span class="doccomment">/// Check dropping a lease in a different thread than it was created doesn&#39;t cause any
             /// problems.
             </span><span class="attribute">#[test]
             </span><span class="kw">fn </span>guard_drop_in_another_thread() {
                 <span class="kw">for _ in </span><span class="number">0</span>..ITERATIONS {
                     <span class="kw">let </span>cnt = Arc::new(AtomicUsize::new(<span class="number">0</span>));
                     <span class="kw">let </span>shared = As::from_pointee(ReportDrop(cnt.clone()));
                     <span class="macro">assert_eq!</span>(cnt.load(Ordering::Relaxed), <span class="number">0</span>, <span class="string">&quot;Dropped prematurely&quot;</span>);
                     <span class="kw">let </span>guard = shared.load();

                     drop(shared);
                     <span class="macro">assert_eq!</span>(cnt.load(Ordering::Relaxed), <span class="number">0</span>, <span class="string">&quot;Dropped prematurely&quot;</span>);

                     thread::scope(|scope| {
                         scope.spawn(|<span class="kw">_</span>| {
                             drop(guard);
                         });
                     })
                     .unwrap();

                     <span class="macro">assert_eq!</span>(cnt.load(Ordering::Relaxed), <span class="number">1</span>, <span class="string">&quot;Not dropped&quot;</span>);
                 }
             }

             <span class="attribute">#[test]
             </span><span class="kw">fn </span>load_option() {
                 <span class="kw">let </span>shared = Aso::from_pointee(<span class="number">42</span>);
                 <span class="comment">// The type here is not needed in real code, it&#39;s just addition test the type matches.
                 </span><span class="kw">let </span>opt: <span class="prelude-ty">Option</span>&lt;<span class="kw">_</span>&gt; = Guard::into_inner(shared.load());
                 <span class="macro">assert_eq!</span>(<span class="number">42</span>, <span class="kw-2">*</span>opt.unwrap());

                 shared.store(<span class="prelude-val">None</span>);
                 <span class="macro">assert!</span>(shared.load().is_none());
             }

             <span class="comment">// Check stuff can get formatted
             </span><span class="attribute">#[test]
             </span><span class="kw">fn </span>debug_impl() {
                 <span class="kw">let </span>shared = As::from_pointee(<span class="number">42</span>);
                 <span class="macro">assert_eq!</span>(<span class="string">&quot;ArcSwapAny(42)&quot;</span>, <span class="kw-2">&amp;</span><span class="macro">format!</span>(<span class="string">&quot;{:?}&quot;</span>, shared));
                 <span class="macro">assert_eq!</span>(<span class="string">&quot;42&quot;</span>, <span class="kw-2">&amp;</span><span class="macro">format!</span>(<span class="string">&quot;{:?}&quot;</span>, shared.load()));
             }

             <span class="attribute">#[test]
             </span><span class="kw">fn </span>display_impl() {
                 <span class="kw">let </span>shared = As::from_pointee(<span class="number">42</span>);
                 <span class="macro">assert_eq!</span>(<span class="string">&quot;42&quot;</span>, <span class="kw-2">&amp;</span><span class="macro">format!</span>(<span class="string">&quot;{}&quot;</span>, shared));
                 <span class="macro">assert_eq!</span>(<span class="string">&quot;42&quot;</span>, <span class="kw-2">&amp;</span><span class="macro">format!</span>(<span class="string">&quot;{}&quot;</span>, shared.load()));
             }

             <span class="comment">// The following &quot;tests&quot; are not run, only compiled. They check that things that should be
             // Send/Sync actually are.
             </span><span class="kw">fn </span>_check_stuff_is_send_sync() {
                 <span class="kw">let </span>shared = As::from_pointee(<span class="number">42</span>);
                 <span class="kw">let </span>moved = As::from_pointee(<span class="number">42</span>);
                 <span class="kw">let </span>shared_ref = <span class="kw-2">&amp;</span>shared;
                 <span class="kw">let </span>lease = shared.load();
                 <span class="kw">let </span>lease_ref = <span class="kw-2">&amp;</span>lease;
                 <span class="kw">let </span>lease = shared.load();
                 thread::scope(|s| {
                     s.spawn(<span class="kw">move </span>|<span class="kw">_</span>| {
                         <span class="kw">let _ </span>= lease;
                         <span class="kw">let _ </span>= lease_ref;
                         <span class="kw">let _ </span>= shared_ref;
                         <span class="kw">let _ </span>= moved;
                     });
                 })
                 .unwrap();
             }

             <span class="doccomment">/// We have a callback in RCU. Check what happens if we access the value from within.
             </span><span class="attribute">#[test]
             </span><span class="kw">fn </span>recursive() {
                 <span class="kw">let </span>shared = ArcSwap::from(Arc::new(<span class="number">0</span>));

                 shared.rcu(|i| {
                     <span class="kw">if </span><span class="kw-2">**</span>i &lt; <span class="number">10 </span>{
                         shared.rcu(|i| <span class="kw-2">**</span>i + <span class="number">1</span>);
                     }
                     <span class="kw-2">**</span>i
                 });
                 <span class="macro">assert_eq!</span>(<span class="number">10</span>, <span class="kw-2">**</span>shared.load());
                 <span class="macro">assert_eq!</span>(<span class="number">2</span>, Arc::strong_count(<span class="kw-2">&amp;</span>shared.load_full()));
             }

             <span class="doccomment">/// A panic from within the rcu callback should not change anything.
             </span><span class="attribute">#[test]
             </span><span class="kw">fn </span>rcu_panic() {
                 <span class="kw">let </span>shared = ArcSwap::from(Arc::new(<span class="number">0</span>));
                 <span class="macro">assert!</span>(panic::catch_unwind(|| shared.rcu(|<span class="kw">_</span>| -&gt; usize { <span class="macro">panic!</span>() })).is_err());
                 <span class="macro">assert_eq!</span>(<span class="number">1</span>, Arc::strong_count(<span class="kw-2">&amp;</span>shared.swap(Arc::new(<span class="number">42</span>))));
             }

             <span class="doccomment">/// Handling null/none values
             </span><span class="attribute">#[test]
             </span><span class="kw">fn </span>nulls() {
                 <span class="kw">let </span>shared = ArcSwapOption::from(<span class="prelude-val">Some</span>(Arc::new(<span class="number">0</span>)));
                 <span class="kw">let </span>orig = shared.swap(<span class="prelude-val">None</span>);
                 <span class="macro">assert_eq!</span>(<span class="number">1</span>, Arc::strong_count(<span class="kw-2">&amp;</span>orig.unwrap()));
                 <span class="kw">let </span>null = shared.load();
                 <span class="macro">assert!</span>(null.is_none());
                 <span class="kw">let </span>a = Arc::new(<span class="number">42</span>);
                 <span class="kw">let </span>orig = shared.compare_and_swap(ptr::null(), <span class="prelude-val">Some</span>(Arc::clone(<span class="kw-2">&amp;</span>a)));
                 <span class="macro">assert!</span>(orig.is_none());
                 <span class="macro">assert_eq!</span>(<span class="number">2</span>, Arc::strong_count(<span class="kw-2">&amp;</span>a));
                 <span class="kw">let </span>orig = Guard::into_inner(shared.compare_and_swap(<span class="kw-2">&amp;</span><span class="prelude-val">None</span>::&lt;Arc&lt;<span class="kw">_</span>&gt;&gt;, <span class="prelude-val">None</span>));
                 <span class="macro">assert_eq!</span>(<span class="number">3</span>, Arc::strong_count(<span class="kw-2">&amp;</span>a));
                 <span class="macro">assert!</span>(ptr_eq(<span class="kw-2">&amp;</span>a, <span class="kw-2">&amp;</span>orig));
             }

             <span class="attribute">#[test]
             </span><span class="doccomment">/// Multiple RCUs interacting.
             </span><span class="kw">fn </span>rcu() {
                 <span class="kw">const </span>ITERATIONS: usize = <span class="number">50</span>;
                 <span class="kw">const </span>THREADS: usize = <span class="number">10</span>;
                 <span class="kw">let </span>shared = ArcSwap::from(Arc::new(<span class="number">0</span>));
                 thread::scope(|scope| {
                     <span class="kw">for _ in </span><span class="number">0</span>..THREADS {
                         scope.spawn(|<span class="kw">_</span>| {
                             <span class="kw">for _ in </span><span class="number">0</span>..ITERATIONS {
                                 shared.rcu(|old| <span class="kw-2">**</span>old + <span class="number">1</span>);
                             }
                         });
                     }
                 })
                 .unwrap();
                 <span class="macro">assert_eq!</span>(THREADS * ITERATIONS, <span class="kw-2">**</span>shared.load());
             }

             <span class="attribute">#[test]
             </span><span class="doccomment">/// Make sure the reference count and compare_and_swap works as expected.
             </span><span class="kw">fn </span>cas_ref_cnt() {
                 <span class="attribute">#[cfg(miri)]
                 </span><span class="kw">const </span>ITERATIONS: usize = <span class="number">10</span>;
                 <span class="attribute">#[cfg(not(miri))]
                 </span><span class="kw">const </span>ITERATIONS: usize = <span class="number">50</span>;
                 <span class="kw">let </span>shared = ArcSwap::from(Arc::new(<span class="number">0</span>));
                 <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..ITERATIONS {
                     <span class="kw">let </span>orig = shared.load_full();
                     <span class="macro">assert_eq!</span>(i, <span class="kw-2">*</span>orig);
                     <span class="kw">if </span>i % <span class="number">2 </span>== <span class="number">1 </span>{
                         <span class="comment">// One for orig, one for shared
                         </span><span class="macro">assert_eq!</span>(<span class="number">2</span>, Arc::strong_count(<span class="kw-2">&amp;</span>orig));
                     }
                     <span class="kw">let </span>n1 = Arc::new(i + <span class="number">1</span>);
                     <span class="comment">// Fill up the slots sometimes
                     </span><span class="kw">let </span>fillup = || {
                         <span class="kw">if </span>i % <span class="number">2 </span>== <span class="number">0 </span>{
                             <span class="prelude-val">Some</span>((<span class="number">0</span>..ITERATIONS).map(|<span class="kw">_</span>| shared.load()).collect::&lt;Vec&lt;<span class="kw">_</span>&gt;&gt;())
                         } <span class="kw">else </span>{
                             <span class="prelude-val">None
                         </span>}
                     };
                     <span class="kw">let </span>guards = fillup();
                     <span class="comment">// Success
                     </span><span class="kw">let </span>prev = shared.compare_and_swap(<span class="kw-2">&amp;</span>orig, Arc::clone(<span class="kw-2">&amp;</span>n1));
                     <span class="macro">assert!</span>(ptr_eq(<span class="kw-2">&amp;</span>orig, <span class="kw-2">&amp;</span>prev));
                     drop(guards);
                     <span class="comment">// One for orig, one for prev
                     </span><span class="macro">assert_eq!</span>(<span class="number">2</span>, Arc::strong_count(<span class="kw-2">&amp;</span>orig));
                     <span class="comment">// One for n1, one for shared
                     </span><span class="macro">assert_eq!</span>(<span class="number">2</span>, Arc::strong_count(<span class="kw-2">&amp;</span>n1));
                     <span class="macro">assert_eq!</span>(i + <span class="number">1</span>, <span class="kw-2">**</span>shared.load());
                     <span class="kw">let </span>n2 = Arc::new(i);
                     drop(prev);
                     <span class="kw">let </span>guards = fillup();
                     <span class="comment">// Failure
                     </span><span class="kw">let </span>prev = Guard::into_inner(shared.compare_and_swap(<span class="kw-2">&amp;</span>orig, Arc::clone(<span class="kw-2">&amp;</span>n2)));
                     drop(guards);
                     <span class="macro">assert!</span>(ptr_eq(<span class="kw-2">&amp;</span>n1, <span class="kw-2">&amp;</span>prev));
                     <span class="comment">// One for orig
                     </span><span class="macro">assert_eq!</span>(<span class="number">1</span>, Arc::strong_count(<span class="kw-2">&amp;</span>orig));
                     <span class="comment">// One for n1, one for shared, one for prev
                     </span><span class="macro">assert_eq!</span>(<span class="number">3</span>, Arc::strong_count(<span class="kw-2">&amp;</span>n1));
                     <span class="comment">// n2 didn&#39;t get increased
                     </span><span class="macro">assert_eq!</span>(<span class="number">1</span>, Arc::strong_count(<span class="kw-2">&amp;</span>n2));
                     <span class="macro">assert_eq!</span>(i + <span class="number">1</span>, <span class="kw-2">**</span>shared.load());
                 }

                 <span class="kw">let </span>a = shared.load_full();
                 <span class="comment">// One inside shared, one for a
                 </span><span class="macro">assert_eq!</span>(<span class="number">2</span>, Arc::strong_count(<span class="kw-2">&amp;</span>a));
                 drop(shared);
                 <span class="comment">// Only a now
                 </span><span class="macro">assert_eq!</span>(<span class="number">1</span>, Arc::strong_count(<span class="kw-2">&amp;</span>a));
             }
         }
     };
 }

 <span class="macro">t!</span>(tests_default, DefaultStrategy);
 <span class="attribute">#[cfg(all(feature = <span class="string">&quot;internal-test-strategies&quot;</span>, test))]
 #[allow(deprecated)]
 </span><span class="kw">mod </span>internal_strategies {
     <span class="kw">use super</span>::<span class="kw-2">*</span>;
     <span class="macro">t!</span>(
         tests_full_slots,
         <span class="kw">crate</span>::strategy::test_strategies::FillFastSlots
     );
 }

 <span class="doccomment">/// These tests assume details about the used strategy.
 </span><span class="attribute">#[cfg(test)]
 </span><span class="kw">mod </span>tests {
     <span class="kw">use super</span>::<span class="kw-2">*</span>;

     <span class="doccomment">/// Accessing the value inside ArcSwap with Guards (and checks for the reference
     /// counts).
     </span><span class="attribute">#[test]
     </span><span class="kw">fn </span>load_cnt() {
         <span class="kw">let </span>a = Arc::new(<span class="number">0</span>);
         <span class="kw">let </span>shared = ArcSwap::from(Arc::clone(<span class="kw-2">&amp;</span>a));
         <span class="comment">// One in shared, one in a
         </span><span class="macro">assert_eq!</span>(<span class="number">2</span>, Arc::strong_count(<span class="kw-2">&amp;</span>a));
         <span class="kw">let </span>guard = shared.load();
         <span class="macro">assert_eq!</span>(<span class="number">0</span>, <span class="kw-2">**</span>guard);
         <span class="comment">// The guard doesn&#39;t have its own ref count now
         </span><span class="macro">assert_eq!</span>(<span class="number">2</span>, Arc::strong_count(<span class="kw-2">&amp;</span>a));
         <span class="kw">let </span>guard_2 = shared.load();
         <span class="comment">// Unlike with guard, this does not deadlock
         </span>shared.store(Arc::new(<span class="number">1</span>));
         <span class="comment">// But now, each guard got a full Arc inside it
         </span><span class="macro">assert_eq!</span>(<span class="number">3</span>, Arc::strong_count(<span class="kw-2">&amp;</span>a));
         <span class="comment">// And when we get rid of them, they disappear
         </span>drop(guard_2);
         <span class="macro">assert_eq!</span>(<span class="number">2</span>, Arc::strong_count(<span class="kw-2">&amp;</span>a));
         <span class="kw">let </span>_b = Arc::clone(<span class="kw-2">&amp;</span>guard);
         <span class="macro">assert_eq!</span>(<span class="number">3</span>, Arc::strong_count(<span class="kw-2">&amp;</span>a));
         <span class="comment">// We can drop the guard it came from
         </span>drop(guard);
         <span class="macro">assert_eq!</span>(<span class="number">2</span>, Arc::strong_count(<span class="kw-2">&amp;</span>a));
         <span class="kw">let </span>guard = shared.load();
         <span class="macro">assert_eq!</span>(<span class="number">1</span>, <span class="kw-2">**</span>guard);
         drop(shared);
         <span class="comment">// We can still use the guard after the shared disappears
         </span><span class="macro">assert_eq!</span>(<span class="number">1</span>, <span class="kw-2">**</span>guard);
         <span class="kw">let </span>ptr = Arc::clone(<span class="kw-2">&amp;</span>guard);
         <span class="comment">// One in shared, one in guard
         </span><span class="macro">assert_eq!</span>(<span class="number">2</span>, Arc::strong_count(<span class="kw-2">&amp;</span>ptr));
         drop(guard);
         <span class="macro">assert_eq!</span>(<span class="number">1</span>, Arc::strong_count(<span class="kw-2">&amp;</span>ptr));
     }

     <span class="doccomment">/// There can be only limited amount of leases on one thread. Following ones are
     /// created, but contain full Arcs.
     </span><span class="attribute">#[test]
     </span><span class="kw">fn </span>lease_overflow() {
         <span class="attribute">#[cfg(miri)]
         </span><span class="kw">const </span>GUARD_COUNT: usize = <span class="number">100</span>;
         <span class="attribute">#[cfg(not(miri))]
         </span><span class="kw">const </span>GUARD_COUNT: usize = <span class="number">1000</span>;
         <span class="kw">let </span>a = Arc::new(<span class="number">0</span>);
         <span class="kw">let </span>shared = ArcSwap::from(Arc::clone(<span class="kw-2">&amp;</span>a));
         <span class="macro">assert_eq!</span>(<span class="number">2</span>, Arc::strong_count(<span class="kw-2">&amp;</span>a));
         <span class="kw">let </span><span class="kw-2">mut </span>guards = (<span class="number">0</span>..GUARD_COUNT).map(|<span class="kw">_</span>| shared.load()).collect::&lt;Vec&lt;<span class="kw">_</span>&gt;&gt;();
         <span class="kw">let </span>count = Arc::strong_count(<span class="kw-2">&amp;</span>a);
         <span class="macro">assert!</span>(count &gt; <span class="number">2</span>);
         <span class="kw">let </span>guard = shared.load();
         <span class="macro">assert_eq!</span>(count + <span class="number">1</span>, Arc::strong_count(<span class="kw-2">&amp;</span>a));
         drop(guard);
         <span class="macro">assert_eq!</span>(count, Arc::strong_count(<span class="kw-2">&amp;</span>a));
         <span class="comment">// When we delete the first one, it didn&#39;t have an Arc in it, so the ref count
         // doesn&#39;t drop
         </span>guards.swap_remove(<span class="number">0</span>);
         <span class="macro">assert_eq!</span>(count, Arc::strong_count(<span class="kw-2">&amp;</span>a));
         <span class="comment">// But new one reuses now vacant the slot and doesn&#39;t create a new Arc
         </span><span class="kw">let </span>_guard = shared.load();
         <span class="macro">assert_eq!</span>(count, Arc::strong_count(<span class="kw-2">&amp;</span>a));
     }
 }
 </code></pre></div>
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