<!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 to the Rust file `src/libcore/cell.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>cell.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../normalize1.35.0.css"><link rel="stylesheet" type="text/css" href="../../rustdoc1.35.0.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../dark1.35.0.css"><link rel="stylesheet" type="text/css" href="../../light1.35.0.css" id="themeStyle"><script src="../../storage1.35.0.js"></script><noscript><link rel="stylesheet" href="../../noscript1.35.0.css"></noscript><link rel="shortcut icon" href="../../favicon1.35.0.ico"><style type="text/css">#crate-search{background-image:url("../../down-arrow1.35.0.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../core/index.html'><img src='../../rust-logo1.35.0.png' alt='logo' width='100'></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush1.35.0.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme1.35.0.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../settings.html"><img src="../../wheel1.35.0.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><div class="example-wrap"><pre class="rust ">
<span class="doccomment">//! Shareable mutable containers.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Rust memory safety is based on this rule: Given an object `T`, it is only possible to</span>
<span class="doccomment">//! have one of the following:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! - Having several immutable references (`&T`) to the object (also known as **aliasing**).</span>
<span class="doccomment">//! - Having one mutable reference (`&mut T`) to the object (also known as **mutability**).</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! This is enforced by the Rust compiler. However, there are situations where this rule is not</span>
<span class="doccomment">//! flexible enough. Sometimes it is required to have multiple references to an object and yet</span>
<span class="doccomment">//! mutate it.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Shareable mutable containers exist to permit mutability in a controlled manner, even in the</span>
<span class="doccomment">//! presence of aliasing. Both `Cell<T>` and `RefCell<T>` allows to do this in a single threaded</span>
<span class="doccomment">//! way. However, neither `Cell<T>` nor `RefCell<T>` are thread safe (they do not implement</span>
<span class="doccomment">//! `Sync`). If you need to do aliasing and mutation between multiple threads it is possible to</span>
<span class="doccomment">//! use [`Mutex`](../../std/sync/struct.Mutex.html),</span>
<span class="doccomment">//! [`RwLock`](../../std/sync/struct.RwLock.html) or</span>
<span class="doccomment">//! [`atomic`](../../core/sync/atomic/index.html) types.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Values of the `Cell<T>` and `RefCell<T>` types may be mutated through shared references (i.e.</span>
<span class="doccomment">//! the common `&T` type), whereas most Rust types can only be mutated through unique (`&mut T`)</span>
<span class="doccomment">//! references. We say that `Cell<T>` and `RefCell<T>` provide 'interior mutability', in contrast</span>
<span class="doccomment">//! with typical Rust types that exhibit 'inherited mutability'.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Cell types come in two flavors: `Cell<T>` and `RefCell<T>`. `Cell<T>` implements interior</span>
<span class="doccomment">//! mutability by moving values in and out of the `Cell<T>`. To use references instead of values,</span>
<span class="doccomment">//! one must use the `RefCell<T>` type, acquiring a write lock before mutating. `Cell<T>` provides</span>
<span class="doccomment">//! methods to retrieve and change the current interior value:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! - For types that implement `Copy`, the `get` method retrieves the current interior value.</span>
<span class="doccomment">//! - For types that implement `Default`, the `take` method replaces the current interior value</span>
<span class="doccomment">//! with `Default::default()` and returns the replaced value.</span>
<span class="doccomment">//! - For all types, the `replace` method replaces the current interior value and returns the</span>
<span class="doccomment">//! replaced value and the `into_inner` method consumes the `Cell<T>` and returns the interior</span>
<span class="doccomment">//! value. Additionally, the `set` method replaces the interior value, dropping the replaced</span>
<span class="doccomment">//! value.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! `RefCell<T>` uses Rust's lifetimes to implement 'dynamic borrowing', a process whereby one can</span>
<span class="doccomment">//! claim temporary, exclusive, mutable access to the inner value. Borrows for `RefCell<T>`s are</span>
<span class="doccomment">//! tracked 'at runtime', unlike Rust's native reference types which are entirely tracked</span>
<span class="doccomment">//! statically, at compile time. Because `RefCell<T>` borrows are dynamic it is possible to attempt</span>
<span class="doccomment">//! to borrow a value that is already mutably borrowed; when this happens it results in thread</span>
<span class="doccomment">//! panic.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # When to choose interior mutability</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The more common inherited mutability, where one must have unique access to mutate a value, is</span>
<span class="doccomment">//! one of the key language elements that enables Rust to reason strongly about pointer aliasing,</span>
<span class="doccomment">//! statically preventing crash bugs. Because of that, inherited mutability is preferred, and</span>
<span class="doccomment">//! interior mutability is something of a last resort. Since cell types enable mutation where it</span>
<span class="doccomment">//! would otherwise be disallowed though, there are occasions when interior mutability might be</span>
<span class="doccomment">//! appropriate, or even *must* be used, e.g.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! * Introducing mutability 'inside' of something immutable</span>
<span class="doccomment">//! * Implementation details of logically-immutable methods.</span>
<span class="doccomment">//! * Mutating implementations of `Clone`.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Introducing mutability 'inside' of something immutable</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Many shared smart pointer types, including `Rc<T>` and `Arc<T>`, provide containers that can be</span>
<span class="doccomment">//! cloned and shared between multiple parties. Because the contained values may be</span>
<span class="doccomment">//! multiply-aliased, they can only be borrowed with `&`, not `&mut`. Without cells it would be</span>
<span class="doccomment">//! impossible to mutate data inside of these smart pointers at all.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! It's very common then to put a `RefCell<T>` inside shared pointer types to reintroduce</span>
<span class="doccomment">//! mutability:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! use std::collections::HashMap;</span>
<span class="doccomment">//! use std::cell::RefCell;</span>
<span class="doccomment">//! use std::rc::Rc;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn main() {</span>
<span class="doccomment">//! let shared_map: Rc<RefCell<_>> = Rc::new(RefCell::new(HashMap::new()));</span>
<span class="doccomment">//! shared_map.borrow_mut().insert("africa", 92388);</span>
<span class="doccomment">//! shared_map.borrow_mut().insert("kyoto", 11837);</span>
<span class="doccomment">//! shared_map.borrow_mut().insert("piccadilly", 11826);</span>
<span class="doccomment">//! shared_map.borrow_mut().insert("marbles", 38);</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Note that this example uses `Rc<T>` and not `Arc<T>`. `RefCell<T>`s are for single-threaded</span>
<span class="doccomment">//! scenarios. Consider using `RwLock<T>` or `Mutex<T>` if you need shared mutability in a</span>
<span class="doccomment">//! multi-threaded situation.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Implementation details of logically-immutable methods</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Occasionally it may be desirable not to expose in an API that there is mutation happening</span>
<span class="doccomment">//! "under the hood". This may be because logically the operation is immutable, but e.g., caching</span>
<span class="doccomment">//! forces the implementation to perform mutation; or because you must employ mutation to implement</span>
<span class="doccomment">//! a trait method that was originally defined to take `&self`.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! # #![allow(dead_code)]</span>
<span class="doccomment">//! use std::cell::RefCell;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! struct Graph {</span>
<span class="doccomment">//! edges: Vec<(i32, i32)>,</span>
<span class="doccomment">//! span_tree_cache: RefCell<Option<Vec<(i32, i32)>>></span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! impl Graph {</span>
<span class="doccomment">//! fn minimum_spanning_tree(&self) -> Vec<(i32, i32)> {</span>
<span class="doccomment">//! // Create a new scope to contain the lifetime of the</span>
<span class="doccomment">//! // dynamic borrow</span>
<span class="doccomment">//! {</span>
<span class="doccomment">//! // Take a reference to the inside of cache cell</span>
<span class="doccomment">//! let mut cache = self.span_tree_cache.borrow_mut();</span>
<span class="doccomment">//! if cache.is_some() {</span>
<span class="doccomment">//! return cache.as_ref().unwrap().clone();</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! let span_tree = self.calc_span_tree();</span>
<span class="doccomment">//! *cache = Some(span_tree);</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // Recursive call to return the just-cached value.</span>
<span class="doccomment">//! // Note that if we had not let the previous borrow</span>
<span class="doccomment">//! // of the cache fall out of scope then the subsequent</span>
<span class="doccomment">//! // recursive borrow would cause a dynamic thread panic.</span>
<span class="doccomment">//! // This is the major hazard of using `RefCell`.</span>
<span class="doccomment">//! self.minimum_spanning_tree()</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! # fn calc_span_tree(&self) -> Vec<(i32, i32)> { vec![] }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Mutating implementations of `Clone`</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! This is simply a special - but common - case of the previous: hiding mutability for operations</span>
<span class="doccomment">//! that appear to be immutable. The `clone` method is expected to not change the source value, and</span>
<span class="doccomment">//! is declared to take `&self`, not `&mut self`. Therefore, any mutation that happens in the</span>
<span class="doccomment">//! `clone` method must use cell types. For example, `Rc<T>` maintains its reference counts within a</span>
<span class="doccomment">//! `Cell<T>`.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! #![feature(core_intrinsics)]</span>
<span class="doccomment">//! use std::cell::Cell;</span>
<span class="doccomment">//! use std::ptr::NonNull;</span>
<span class="doccomment">//! use std::intrinsics::abort;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! struct Rc<T: ?Sized> {</span>
<span class="doccomment">//! ptr: NonNull<RcBox<T>></span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! struct RcBox<T: ?Sized> {</span>
<span class="doccomment">//! strong: Cell<usize>,</span>
<span class="doccomment">//! refcount: Cell<usize>,</span>
<span class="doccomment">//! value: T,</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! impl<T: ?Sized> Clone for Rc<T> {</span>
<span class="doccomment">//! fn clone(&self) -> Rc<T> {</span>
<span class="doccomment">//! self.inc_strong();</span>
<span class="doccomment">//! Rc { ptr: self.ptr }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! trait RcBoxPtr<T: ?Sized> {</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn inner(&self) -> &RcBox<T>;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn strong(&self) -> usize {</span>
<span class="doccomment">//! self.inner().strong.get()</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn inc_strong(&self) {</span>
<span class="doccomment">//! self.inner()</span>
<span class="doccomment">//! .strong</span>
<span class="doccomment">//! .set(self.strong()</span>
<span class="doccomment">//! .checked_add(1)</span>
<span class="doccomment">//! .unwrap_or_else(|| unsafe { abort() }));</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! impl<T: ?Sized> RcBoxPtr<T> for Rc<T> {</span>
<span class="doccomment">//! fn inner(&self) -> &RcBox<T> {</span>
<span class="doccomment">//! unsafe {</span>
<span class="doccomment">//! self.ptr.as_ref()</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="attribute">#![<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">use</span> <span class="ident">cmp</span>::<span class="ident">Ordering</span>;
<span class="kw">use</span> <span class="ident">fmt</span>::{<span class="self">self</span>, <span class="ident">Debug</span>, <span class="ident">Display</span>};
<span class="kw">use</span> <span class="ident">marker</span>::<span class="ident">Unsize</span>;
<span class="kw">use</span> <span class="ident">mem</span>;
<span class="kw">use</span> <span class="ident">ops</span>::{<span class="ident">Deref</span>, <span class="ident">DerefMut</span>, <span class="ident">CoerceUnsized</span>};
<span class="kw">use</span> <span class="ident">ptr</span>;
<span class="doccomment">/// A mutable memory location.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// In this example, you can see that `Cell<T>` enables mutation inside an</span>
<span class="doccomment">/// immutable struct. In other words, it enables "interior mutability".</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::Cell;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct SomeStruct {</span>
<span class="doccomment">/// regular_field: u8,</span>
<span class="doccomment">/// special_field: Cell<u8>,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let my_struct = SomeStruct {</span>
<span class="doccomment">/// regular_field: 0,</span>
<span class="doccomment">/// special_field: Cell::new(1),</span>
<span class="doccomment">/// };</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let new_value = 100;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // ERROR: `my_struct` is immutable</span>
<span class="doccomment">/// // my_struct.regular_field = new_value;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // WORKS: although `my_struct` is immutable, `special_field` is a `Cell`,</span>
<span class="doccomment">/// // which can always be mutated</span>
<span class="doccomment">/// my_struct.special_field.set(new_value);</span>
<span class="doccomment">/// assert_eq!(my_struct.special_field.get(), new_value);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See the [module-level documentation](index.html) for more.</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">transparent</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> {
<span class="ident">value</span>: <span class="ident">UnsafeCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>:<span class="ident">Copy</span><span class="op">></span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Returns a copy of the contained value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::Cell;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let c = Cell::new(5);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let five = c.get();</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">T</span> {
<span class="kw">unsafe</span>{ <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">value</span>.<span class="ident">get</span>() }
}
<span class="doccomment">/// Updates the contained value using a function and returns the new value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(cell_update)]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// use std::cell::Cell;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let c = Cell::new(5);</span>
<span class="doccomment">/// let new = c.update(|x| x + 1);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(new, 6);</span>
<span class="doccomment">/// assert_eq!(c.get(), 6);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"cell_update"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"50186"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">update</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="ident">T</span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span>,
{
<span class="kw">let</span> <span class="ident">old</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">get</span>();
<span class="kw">let</span> <span class="ident">new</span> <span class="op">=</span> <span class="ident">f</span>(<span class="ident">old</span>);
<span class="self">self</span>.<span class="ident">set</span>(<span class="ident">new</span>);
<span class="ident">new</span>
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Send</span> <span class="kw">for</span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Send</span> {}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="op">!</span><span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>:<span class="ident">Copy</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">Cell</span>::<span class="ident">new</span>(<span class="self">self</span>.<span class="ident">get</span>())
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>:<span class="ident">Default</span><span class="op">></span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Creates a `Cell<T>`, with the `Default` value for T.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-></span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">Cell</span>::<span class="ident">new</span>(<span class="ident">Default</span>::<span class="ident">default</span>())
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>:<span class="ident">PartialEq</span> <span class="op">+</span> <span class="ident">Copy</span><span class="op">></span> <span class="ident">PartialEq</span> <span class="kw">for</span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">get</span>() <span class="op">==</span> <span class="ident">other</span>.<span class="ident">get</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"cell_eq"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.2.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>:<span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Copy</span><span class="op">></span> <span class="ident">Eq</span> <span class="kw">for</span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"cell_ord"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.10.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>:<span class="ident">PartialOrd</span> <span class="op">+</span> <span class="ident">Copy</span><span class="op">></span> <span class="ident">PartialOrd</span> <span class="kw">for</span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">partial_cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Ordering</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">get</span>().<span class="ident">partial_cmp</span>(<span class="kw-2">&</span><span class="ident">other</span>.<span class="ident">get</span>())
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">lt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">get</span>() <span class="op"><</span> <span class="ident">other</span>.<span class="ident">get</span>()
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">le</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">get</span>() <span class="op"><=</span> <span class="ident">other</span>.<span class="ident">get</span>()
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">gt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">get</span>() <span class="op">></span> <span class="ident">other</span>.<span class="ident">get</span>()
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">ge</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">get</span>() <span class="op">>=</span> <span class="ident">other</span>.<span class="ident">get</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"cell_ord"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.10.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>:<span class="ident">Ord</span> <span class="op">+</span> <span class="ident">Copy</span><span class="op">></span> <span class="ident">Ord</span> <span class="kw">for</span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">Ordering</span> {
<span class="self">self</span>.<span class="ident">get</span>().<span class="ident">cmp</span>(<span class="kw-2">&</span><span class="ident">other</span>.<span class="ident">get</span>())
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"cell_from"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.12.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">t</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">Cell</span>::<span class="ident">new</span>(<span class="ident">t</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Creates a new `Cell` containing the given value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::Cell;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let c = Cell::new(5);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">value</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">Cell</span> {
<span class="ident">value</span>: <span class="ident">UnsafeCell</span>::<span class="ident">new</span>(<span class="ident">value</span>),
}
}
<span class="doccomment">/// Sets the contained value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::Cell;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let c = Cell::new(5);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// c.set(10);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">val</span>: <span class="ident">T</span>) {
<span class="kw">let</span> <span class="ident">old</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">replace</span>(<span class="ident">val</span>);
<span class="ident">drop</span>(<span class="ident">old</span>);
}
<span class="doccomment">/// Swaps the values of two Cells.</span>
<span class="doccomment">/// Difference with `std::mem::swap` is that this function doesn't require `&mut` reference.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::Cell;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let c1 = Cell::new(5i32);</span>
<span class="doccomment">/// let c2 = Cell::new(10i32);</span>
<span class="doccomment">/// c1.swap(&c2);</span>
<span class="doccomment">/// assert_eq!(10, c1.get());</span>
<span class="doccomment">/// assert_eq!(5, c2.get());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"move_cell"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">swap</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="self">Self</span>) {
<span class="kw">if</span> <span class="ident">ptr</span>::<span class="ident">eq</span>(<span class="self">self</span>, <span class="ident">other</span>) {
<span class="kw">return</span>;
}
<span class="kw">unsafe</span> {
<span class="ident">ptr</span>::<span class="ident">swap</span>(<span class="self">self</span>.<span class="ident">value</span>.<span class="ident">get</span>(), <span class="ident">other</span>.<span class="ident">value</span>.<span class="ident">get</span>());
}
}
<span class="doccomment">/// Replaces the contained value, and returns it.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::Cell;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let cell = Cell::new(5);</span>
<span class="doccomment">/// assert_eq!(cell.get(), 5);</span>
<span class="doccomment">/// assert_eq!(cell.replace(10), 5);</span>
<span class="doccomment">/// assert_eq!(cell.get(), 10);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"move_cell"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">replace</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">val</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span> {
<span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw">unsafe</span> { <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">value</span>.<span class="ident">get</span>() }, <span class="ident">val</span>)
}
<span class="doccomment">/// Unwraps the value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::Cell;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let c = Cell::new(5);</span>
<span class="doccomment">/// let five = c.into_inner();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(five, 5);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"move_cell"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_inner</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">T</span> {
<span class="self">self</span>.<span class="ident">value</span>.<span class="ident">into_inner</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Returns a raw pointer to the underlying data in this cell.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::Cell;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let c = Cell::new(5);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let ptr = c.as_ptr();</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"cell_as_ptr"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.12.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">as_ptr</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="self">self</span>.<span class="ident">value</span>.<span class="ident">get</span>()
}
<span class="doccomment">/// Returns a mutable reference to the underlying data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This call borrows `Cell` mutably (at compile-time) which guarantees</span>
<span class="doccomment">/// that we possess the only reference.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::Cell;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut c = Cell::new(5);</span>
<span class="doccomment">/// *c.get_mut() += 1;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(c.get(), 6);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"cell_get_mut"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.11.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="kw">unsafe</span> {
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">value</span>.<span class="ident">get</span>()
}
}
<span class="doccomment">/// Returns a `&Cell<T>` from a `&mut T`</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(as_cell)]</span>
<span class="doccomment">/// use std::cell::Cell;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let slice: &mut [i32] = &mut [1, 2, 3];</span>
<span class="doccomment">/// let cell_slice: &Cell<[i32]> = Cell::from_mut(slice);</span>
<span class="doccomment">/// let slice_cell: &[Cell<i32>] = cell_slice.as_slice_of_cells();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(slice_cell.len(), 3);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"as_cell"</span>, <span class="ident">issue</span><span class="op">=</span><span class="string">"43038"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_mut</span>(<span class="ident">t</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">unsafe</span> {
<span class="kw-2">&</span><span class="kw-2">*</span>(<span class="ident">t</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>)
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Default</span><span class="op">></span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Takes the value of the cell, leaving `Default::default()` in its place.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::Cell;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let c = Cell::new(5);</span>
<span class="doccomment">/// let five = c.take();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(five, 5);</span>
<span class="doccomment">/// assert_eq!(c.into_inner(), 0);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"move_cell"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">take</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">T</span> {
<span class="self">self</span>.<span class="ident">replace</span>(<span class="ident">Default</span>::<span class="ident">default</span>())
}
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"coerce_unsized"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"27732"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">CoerceUnsized</span><span class="op"><</span><span class="ident">U</span><span class="op">></span>, <span class="ident">U</span><span class="op">></span> <span class="ident">CoerceUnsized</span><span class="op"><</span><span class="ident">Cell</span><span class="op"><</span><span class="ident">U</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Cell</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> {
<span class="doccomment">/// Returns a `&[Cell<T>]` from a `&Cell<[T]>`</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(as_cell)]</span>
<span class="doccomment">/// use std::cell::Cell;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let slice: &mut [i32] = &mut [1, 2, 3];</span>
<span class="doccomment">/// let cell_slice: &Cell<[i32]> = Cell::from_mut(slice);</span>
<span class="doccomment">/// let slice_cell: &[Cell<i32>] = cell_slice.as_slice_of_cells();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(slice_cell.len(), 3);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"as_cell"</span>, <span class="ident">issue</span><span class="op">=</span><span class="string">"43038"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_slice_of_cells</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>] {
<span class="kw">unsafe</span> {
<span class="kw-2">&</span><span class="kw-2">*</span>(<span class="self">self</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">Cell</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> [<span class="ident">Cell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>])
}
}
}
<span class="doccomment">/// A mutable memory location with dynamically checked borrow rules</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See the [module-level documentation](index.html) for more.</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> {
<span class="ident">borrow</span>: <span class="ident">Cell</span><span class="op"><</span><span class="ident">BorrowFlag</span><span class="op">></span>,
<span class="ident">value</span>: <span class="ident">UnsafeCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
}
<span class="doccomment">/// An error returned by [`RefCell::try_borrow`](struct.RefCell.html#method.try_borrow).</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"try_borrow"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.13.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">BorrowError</span> {
<span class="ident">_private</span>: (),
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"try_borrow"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.13.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">BorrowError</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"BorrowError"</span>).<span class="ident">finish</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"try_borrow"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.13.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">Display</span> <span class="kw">for</span> <span class="ident">BorrowError</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">Display</span>::<span class="ident">fmt</span>(<span class="string">"already mutably borrowed"</span>, <span class="ident">f</span>)
}
}
<span class="doccomment">/// An error returned by [`RefCell::try_borrow_mut`](struct.RefCell.html#method.try_borrow_mut).</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"try_borrow"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.13.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">BorrowMutError</span> {
<span class="ident">_private</span>: (),
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"try_borrow"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.13.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">BorrowMutError</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"BorrowMutError"</span>).<span class="ident">finish</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"try_borrow"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.13.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">Display</span> <span class="kw">for</span> <span class="ident">BorrowMutError</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">Display</span>::<span class="ident">fmt</span>(<span class="string">"already borrowed"</span>, <span class="ident">f</span>)
}
}
<span class="comment">// Positive values represent the number of `Ref` active. Negative values</span>
<span class="comment">// represent the number of `RefMut` active. Multiple `RefMut`s can only be</span>
<span class="comment">// active at a time if they refer to distinct, nonoverlapping components of a</span>
<span class="comment">// `RefCell` (e.g., different ranges of a slice).</span>
<span class="comment">//</span>
<span class="comment">// `Ref` and `RefMut` are both two words in size, and so there will likely never</span>
<span class="comment">// be enough `Ref`s or `RefMut`s in existence to overflow half of the `usize`</span>
<span class="comment">// range. Thus, a `BorrowFlag` will probably never overflow or underflow.</span>
<span class="comment">// However, this is not a guarantee, as a pathological program could repeatedly</span>
<span class="comment">// create and then mem::forget `Ref`s or `RefMut`s. Thus, all code must</span>
<span class="comment">// explicitly check for overflow and underflow in order to avoid unsafety, or at</span>
<span class="comment">// least behave correctly in the event that overflow or underflow happens (e.g.,</span>
<span class="comment">// see BorrowRef::new).</span>
<span class="kw">type</span> <span class="ident">BorrowFlag</span> <span class="op">=</span> <span class="ident">isize</span>;
<span class="kw">const</span> <span class="ident">UNUSED</span>: <span class="ident">BorrowFlag</span> <span class="op">=</span> <span class="number">0</span>;
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span>
<span class="kw">fn</span> <span class="ident">is_writing</span>(<span class="ident">x</span>: <span class="ident">BorrowFlag</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="ident">x</span> <span class="op"><</span> <span class="ident">UNUSED</span>
}
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span>
<span class="kw">fn</span> <span class="ident">is_reading</span>(<span class="ident">x</span>: <span class="ident">BorrowFlag</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="ident">x</span> <span class="op">></span> <span class="ident">UNUSED</span>
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Creates a new `RefCell` containing `value`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::RefCell;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let c = RefCell::new(5);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">value</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">RefCell</span> {
<span class="ident">value</span>: <span class="ident">UnsafeCell</span>::<span class="ident">new</span>(<span class="ident">value</span>),
<span class="ident">borrow</span>: <span class="ident">Cell</span>::<span class="ident">new</span>(<span class="ident">UNUSED</span>),
}
}
<span class="doccomment">/// Consumes the `RefCell`, returning the wrapped value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::RefCell;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let c = RefCell::new(5);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let five = c.into_inner();</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_inner</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">T</span> {
<span class="comment">// Since this function takes `self` (the `RefCell`) by value, the</span>
<span class="comment">// compiler statically verifies that it is not currently borrowed.</span>
<span class="comment">// Therefore the following assertion is just a `debug_assert!`.</span>
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">borrow</span>.<span class="ident">get</span>() <span class="op">==</span> <span class="ident">UNUSED</span>);
<span class="self">self</span>.<span class="ident">value</span>.<span class="ident">into_inner</span>()
}
<span class="doccomment">/// Replaces the wrapped value with a new one, returning the old value,</span>
<span class="doccomment">/// without deinitializing either one.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function corresponds to [`std::mem::replace`](../mem/fn.replace.html).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the value is currently borrowed.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::RefCell;</span>
<span class="doccomment">/// let cell = RefCell::new(5);</span>
<span class="doccomment">/// let old_value = cell.replace(6);</span>
<span class="doccomment">/// assert_eq!(old_value, 5);</span>
<span class="doccomment">/// assert_eq!(cell, RefCell::new(6));</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"refcell_replace"</span>, <span class="ident">since</span><span class="op">=</span><span class="string">"1.24.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">replace</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">t</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span> {
<span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">borrow_mut</span>(), <span class="ident">t</span>)
}
<span class="doccomment">/// Replaces the wrapped value with a new one computed from `f`, returning</span>
<span class="doccomment">/// the old value, without deinitializing either one.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the value is currently borrowed.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::RefCell;</span>
<span class="doccomment">/// let cell = RefCell::new(5);</span>
<span class="doccomment">/// let old_value = cell.replace_with(|&mut old| old + 1);</span>
<span class="doccomment">/// assert_eq!(old_value, 5);</span>
<span class="doccomment">/// assert_eq!(cell, RefCell::new(6));</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"refcell_replace_swap"</span>, <span class="ident">since</span><span class="op">=</span><span class="string">"1.35.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">replace_with</span><span class="op"><</span><span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-></span> <span class="ident">T</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="ident">T</span> {
<span class="kw">let</span> <span class="ident">mut_borrow</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">borrow_mut</span>();
<span class="kw">let</span> <span class="ident">replacement</span> <span class="op">=</span> <span class="ident">f</span>(<span class="ident">mut_borrow</span>);
<span class="ident">mem</span>::<span class="ident">replace</span>(<span class="ident">mut_borrow</span>, <span class="ident">replacement</span>)
}
<span class="doccomment">/// Swaps the wrapped value of `self` with the wrapped value of `other`,</span>
<span class="doccomment">/// without deinitializing either one.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function corresponds to [`std::mem::swap`](../mem/fn.swap.html).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the value in either `RefCell` is currently borrowed.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::RefCell;</span>
<span class="doccomment">/// let c = RefCell::new(5);</span>
<span class="doccomment">/// let d = RefCell::new(6);</span>
<span class="doccomment">/// c.swap(&d);</span>
<span class="doccomment">/// assert_eq!(c, RefCell::new(6));</span>
<span class="doccomment">/// assert_eq!(d, RefCell::new(5));</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"refcell_swap"</span>, <span class="ident">since</span><span class="op">=</span><span class="string">"1.24.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">swap</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="self">Self</span>) {
<span class="ident">mem</span>::<span class="ident">swap</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">borrow_mut</span>(), <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">other</span>.<span class="ident">borrow_mut</span>())
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Immutably borrows the wrapped value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The borrow lasts until the returned `Ref` exits scope. Multiple</span>
<span class="doccomment">/// immutable borrows can be taken out at the same time.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the value is currently mutably borrowed. For a non-panicking variant, use</span>
<span class="doccomment">/// [`try_borrow`](#method.try_borrow).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::RefCell;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let c = RefCell::new(5);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let borrowed_five = c.borrow();</span>
<span class="doccomment">/// let borrowed_five2 = c.borrow();</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// An example of panic:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::RefCell;</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let result = thread::spawn(move || {</span>
<span class="doccomment">/// let c = RefCell::new(5);</span>
<span class="doccomment">/// let m = c.borrow_mut();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let b = c.borrow(); // this causes a panic</span>
<span class="doccomment">/// }).join();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(result.is_err());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">borrow</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Ref</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">try_borrow</span>().<span class="ident">expect</span>(<span class="string">"already mutably borrowed"</span>)
}
<span class="doccomment">/// Immutably borrows the wrapped value, returning an error if the value is currently mutably</span>
<span class="doccomment">/// borrowed.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The borrow lasts until the returned `Ref` exits scope. Multiple immutable borrows can be</span>
<span class="doccomment">/// taken out at the same time.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is the non-panicking variant of [`borrow`](#method.borrow).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::RefCell;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let c = RefCell::new(5);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// {</span>
<span class="doccomment">/// let m = c.borrow_mut();</span>
<span class="doccomment">/// assert!(c.try_borrow().is_err());</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// {</span>
<span class="doccomment">/// let m = c.borrow();</span>
<span class="doccomment">/// assert!(c.try_borrow().is_ok());</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"try_borrow"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.13.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">try_borrow</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Ref</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>, <span class="ident">BorrowError</span><span class="op">></span> {
<span class="kw">match</span> <span class="ident">BorrowRef</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">borrow</span>) {
<span class="prelude-val">Some</span>(<span class="ident">b</span>) <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="ident">Ref</span> {
<span class="ident">value</span>: <span class="kw">unsafe</span> { <span class="kw-2">&</span><span class="kw-2">*</span><span class="self">self</span>.<span class="ident">value</span>.<span class="ident">get</span>() },
<span class="ident">borrow</span>: <span class="ident">b</span>,
}),
<span class="prelude-val">None</span> <span class="op">=></span> <span class="prelude-val">Err</span>(<span class="ident">BorrowError</span> { <span class="ident">_private</span>: () }),
}
}
<span class="doccomment">/// Mutably borrows the wrapped value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The borrow lasts until the returned `RefMut` or all `RefMut`s derived</span>
<span class="doccomment">/// from it exit scope. The value cannot be borrowed while this borrow is</span>
<span class="doccomment">/// active.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the value is currently borrowed. For a non-panicking variant, use</span>
<span class="doccomment">/// [`try_borrow_mut`](#method.try_borrow_mut).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::RefCell;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let c = RefCell::new(5);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// *c.borrow_mut() = 7;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(*c.borrow(), 7);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// An example of panic:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::RefCell;</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let result = thread::spawn(move || {</span>
<span class="doccomment">/// let c = RefCell::new(5);</span>
<span class="doccomment">/// let m = c.borrow();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let b = c.borrow_mut(); // this causes a panic</span>
<span class="doccomment">/// }).join();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(result.is_err());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">borrow_mut</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">RefMut</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">try_borrow_mut</span>().<span class="ident">expect</span>(<span class="string">"already borrowed"</span>)
}
<span class="doccomment">/// Mutably borrows the wrapped value, returning an error if the value is currently borrowed.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The borrow lasts until the returned `RefMut` or all `RefMut`s derived</span>
<span class="doccomment">/// from it exit scope. The value cannot be borrowed while this borrow is</span>
<span class="doccomment">/// active.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is the non-panicking variant of [`borrow_mut`](#method.borrow_mut).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::RefCell;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let c = RefCell::new(5);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// {</span>
<span class="doccomment">/// let m = c.borrow();</span>
<span class="doccomment">/// assert!(c.try_borrow_mut().is_err());</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(c.try_borrow_mut().is_ok());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"try_borrow"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.13.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">try_borrow_mut</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">RefMut</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>, <span class="ident">BorrowMutError</span><span class="op">></span> {
<span class="kw">match</span> <span class="ident">BorrowRefMut</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">borrow</span>) {
<span class="prelude-val">Some</span>(<span class="ident">b</span>) <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="ident">RefMut</span> {
<span class="ident">value</span>: <span class="kw">unsafe</span> { <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">value</span>.<span class="ident">get</span>() },
<span class="ident">borrow</span>: <span class="ident">b</span>,
}),
<span class="prelude-val">None</span> <span class="op">=></span> <span class="prelude-val">Err</span>(<span class="ident">BorrowMutError</span> { <span class="ident">_private</span>: () }),
}
}
<span class="doccomment">/// Returns a raw pointer to the underlying data in this cell.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::RefCell;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let c = RefCell::new(5);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let ptr = c.as_ptr();</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"cell_as_ptr"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.12.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_ptr</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="self">self</span>.<span class="ident">value</span>.<span class="ident">get</span>()
}
<span class="doccomment">/// Returns a mutable reference to the underlying data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This call borrows `RefCell` mutably (at compile-time) so there is no</span>
<span class="doccomment">/// need for dynamic checks.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// However be cautious: this method expects `self` to be mutable, which is</span>
<span class="doccomment">/// generally not the case when using a `RefCell`. Take a look at the</span>
<span class="doccomment">/// [`borrow_mut`] method instead if `self` isn't mutable.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Also, please be aware that this method is only for special circumstances and is usually</span>
<span class="doccomment">/// not what you want. In case of doubt, use [`borrow_mut`] instead.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`borrow_mut`]: #method.borrow_mut</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::RefCell;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut c = RefCell::new(5);</span>
<span class="doccomment">/// *c.get_mut() += 1;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(c, RefCell::new(6));</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"cell_get_mut"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.11.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="kw">unsafe</span> {
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">value</span>.<span class="ident">get</span>()
}
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Send</span> <span class="kw">for</span> <span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Send</span> {}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="op">!</span><span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Clone</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the value is currently mutably borrowed.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">RefCell</span>::<span class="ident">new</span>(<span class="self">self</span>.<span class="ident">borrow</span>().<span class="ident">clone</span>())
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>:<span class="ident">Default</span><span class="op">></span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Creates a `RefCell<T>`, with the `Default` value for T.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-></span> <span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">RefCell</span>::<span class="ident">new</span>(<span class="ident">Default</span>::<span class="ident">default</span>())
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">PartialEq</span><span class="op">></span> <span class="ident">PartialEq</span> <span class="kw">for</span> <span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the value in either `RefCell` is currently borrowed.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw-2">*</span><span class="self">self</span>.<span class="ident">borrow</span>() <span class="op">==</span> <span class="kw-2">*</span><span class="ident">other</span>.<span class="ident">borrow</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"cell_eq"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.2.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Eq</span><span class="op">></span> <span class="ident">Eq</span> <span class="kw">for</span> <span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"cell_ord"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.10.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">PartialOrd</span><span class="op">></span> <span class="ident">PartialOrd</span> <span class="kw">for</span> <span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the value in either `RefCell` is currently borrowed.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">partial_cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Ordering</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">borrow</span>().<span class="ident">partial_cmp</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">other</span>.<span class="ident">borrow</span>())
}
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the value in either `RefCell` is currently borrowed.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">lt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw-2">*</span><span class="self">self</span>.<span class="ident">borrow</span>() <span class="op"><</span> <span class="kw-2">*</span><span class="ident">other</span>.<span class="ident">borrow</span>()
}
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the value in either `RefCell` is currently borrowed.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">le</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw-2">*</span><span class="self">self</span>.<span class="ident">borrow</span>() <span class="op"><=</span> <span class="kw-2">*</span><span class="ident">other</span>.<span class="ident">borrow</span>()
}
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the value in either `RefCell` is currently borrowed.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">gt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw-2">*</span><span class="self">self</span>.<span class="ident">borrow</span>() <span class="op">></span> <span class="kw-2">*</span><span class="ident">other</span>.<span class="ident">borrow</span>()
}
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the value in either `RefCell` is currently borrowed.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">ge</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw-2">*</span><span class="self">self</span>.<span class="ident">borrow</span>() <span class="op">>=</span> <span class="kw-2">*</span><span class="ident">other</span>.<span class="ident">borrow</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"cell_ord"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.10.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Ord</span><span class="op">></span> <span class="ident">Ord</span> <span class="kw">for</span> <span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the value in either `RefCell` is currently borrowed.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">Ordering</span> {
<span class="self">self</span>.<span class="ident">borrow</span>().<span class="ident">cmp</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">other</span>.<span class="ident">borrow</span>())
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"cell_from"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.12.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">t</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">RefCell</span>::<span class="ident">new</span>(<span class="ident">t</span>)
}
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"coerce_unsized"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"27732"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">CoerceUnsized</span><span class="op"><</span><span class="ident">U</span><span class="op">></span>, <span class="ident">U</span><span class="op">></span> <span class="ident">CoerceUnsized</span><span class="op"><</span><span class="ident">RefCell</span><span class="op"><</span><span class="ident">U</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">RefCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
<span class="kw">struct</span> <span class="ident">BorrowRef</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span> {
<span class="ident">borrow</span>: <span class="kw-2">&</span><span class="lifetime">'b</span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">BorrowFlag</span><span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span> <span class="ident">BorrowRef</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">borrow</span>: <span class="kw-2">&</span><span class="lifetime">'b</span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">BorrowFlag</span><span class="op">></span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">BorrowRef</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">>></span> {
<span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">borrow</span>.<span class="ident">get</span>();
<span class="kw">if</span> <span class="ident">is_writing</span>(<span class="ident">b</span>) <span class="op">||</span> <span class="ident">b</span> <span class="op">==</span> <span class="ident">isize</span>::<span class="ident">max_value</span>() {
<span class="comment">// If there's currently a writing borrow, or if incrementing the</span>
<span class="comment">// refcount would overflow into a writing borrow.</span>
<span class="prelude-val">None</span>
} <span class="kw">else</span> {
<span class="ident">borrow</span>.<span class="ident">set</span>(<span class="ident">b</span> <span class="op">+</span> <span class="number">1</span>);
<span class="prelude-val">Some</span>(<span class="ident">BorrowRef</span> { <span class="ident">borrow</span> })
}
}
}
<span class="kw">impl</span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">BorrowRef</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="kw">let</span> <span class="ident">borrow</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">borrow</span>.<span class="ident">get</span>();
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">is_reading</span>(<span class="ident">borrow</span>));
<span class="self">self</span>.<span class="ident">borrow</span>.<span class="ident">set</span>(<span class="ident">borrow</span> <span class="op">-</span> <span class="number">1</span>);
}
}
<span class="kw">impl</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">BorrowRef</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="self">Self</span> {
<span class="comment">// Since this Ref exists, we know the borrow flag</span>
<span class="comment">// is a reading borrow.</span>
<span class="kw">let</span> <span class="ident">borrow</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">borrow</span>.<span class="ident">get</span>();
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">is_reading</span>(<span class="ident">borrow</span>));
<span class="comment">// Prevent the borrow counter from overflowing into</span>
<span class="comment">// a writing borrow.</span>
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">borrow</span> <span class="op">!=</span> <span class="ident">isize</span>::<span class="ident">max_value</span>());
<span class="self">self</span>.<span class="ident">borrow</span>.<span class="ident">set</span>(<span class="ident">borrow</span> <span class="op">+</span> <span class="number">1</span>);
<span class="ident">BorrowRef</span> { <span class="ident">borrow</span>: <span class="self">self</span>.<span class="ident">borrow</span> }
}
}
<span class="doccomment">/// Wraps a borrowed reference to a value in a `RefCell` box.</span>
<span class="doccomment">/// A wrapper type for an immutably borrowed value from a `RefCell<T>`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See the [module-level documentation](index.html) for more.</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Ref</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="lifetime">'b</span><span class="op">></span> {
<span class="ident">value</span>: <span class="kw-2">&</span><span class="lifetime">'b</span> <span class="ident">T</span>,
<span class="ident">borrow</span>: <span class="ident">BorrowRef</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span>,
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Deref</span> <span class="kw">for</span> <span class="ident">Ref</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Target</span> <span class="op">=</span> <span class="ident">T</span>;
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">deref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">T</span> {
<span class="self">self</span>.<span class="ident">value</span>
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Ref</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Copies a `Ref`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `RefCell` is already immutably borrowed, so this cannot fail.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is an associated function that needs to be used as</span>
<span class="doccomment">/// `Ref::clone(...)`. A `Clone` implementation or a method would interfere</span>
<span class="doccomment">/// with the widespread use of `r.borrow().clone()` to clone the contents of</span>
<span class="doccomment">/// a `RefCell`.</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"cell_extras"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.15.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">clone</span>(<span class="ident">orig</span>: <span class="kw-2">&</span><span class="ident">Ref</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">Ref</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span><span class="op">></span> {
<span class="ident">Ref</span> {
<span class="ident">value</span>: <span class="ident">orig</span>.<span class="ident">value</span>,
<span class="ident">borrow</span>: <span class="ident">orig</span>.<span class="ident">borrow</span>.<span class="ident">clone</span>(),
}
}
<span class="doccomment">/// Makes a new `Ref` for a component of the borrowed data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `RefCell` is already immutably borrowed, so this cannot fail.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is an associated function that needs to be used as `Ref::map(...)`.</span>
<span class="doccomment">/// A method would interfere with methods of the same name on the contents</span>
<span class="doccomment">/// of a `RefCell` used through `Deref`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::{RefCell, Ref};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let c = RefCell::new((5, 'b'));</span>
<span class="doccomment">/// let b1: Ref<(u32, char)> = c.borrow();</span>
<span class="doccomment">/// let b2: Ref<u32> = Ref::map(b1, |t| &t.0);</span>
<span class="doccomment">/// assert_eq!(*b2, 5)</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"cell_map"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.8.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">map</span><span class="op"><</span><span class="ident">U</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">F</span><span class="op">></span>(<span class="ident">orig</span>: <span class="ident">Ref</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span><span class="op">></span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="ident">Ref</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">U</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">U</span>
{
<span class="ident">Ref</span> {
<span class="ident">value</span>: <span class="ident">f</span>(<span class="ident">orig</span>.<span class="ident">value</span>),
<span class="ident">borrow</span>: <span class="ident">orig</span>.<span class="ident">borrow</span>,
}
}
<span class="doccomment">/// Splits a `Ref` into multiple `Ref`s for different components of the</span>
<span class="doccomment">/// borrowed data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `RefCell` is already immutably borrowed, so this cannot fail.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is an associated function that needs to be used as</span>
<span class="doccomment">/// `Ref::map_split(...)`. A method would interfere with methods of the same</span>
<span class="doccomment">/// name on the contents of a `RefCell` used through `Deref`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::{Ref, RefCell};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let cell = RefCell::new([1, 2, 3, 4]);</span>
<span class="doccomment">/// let borrow = cell.borrow();</span>
<span class="doccomment">/// let (begin, end) = Ref::map_split(borrow, |slice| slice.split_at(2));</span>
<span class="doccomment">/// assert_eq!(*begin, [1, 2]);</span>
<span class="doccomment">/// assert_eq!(*end, [3, 4]);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"refcell_map_split"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.35.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">map_split</span><span class="op"><</span><span class="ident">U</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">V</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">F</span><span class="op">></span>(<span class="ident">orig</span>: <span class="ident">Ref</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span><span class="op">></span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> (<span class="ident">Ref</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">U</span><span class="op">></span>, <span class="ident">Ref</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">V</span><span class="op">></span>)
<span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> (<span class="kw-2">&</span><span class="ident">U</span>, <span class="kw-2">&</span><span class="ident">V</span>)
{
<span class="kw">let</span> (<span class="ident">a</span>, <span class="ident">b</span>) <span class="op">=</span> <span class="ident">f</span>(<span class="ident">orig</span>.<span class="ident">value</span>);
<span class="kw">let</span> <span class="ident">borrow</span> <span class="op">=</span> <span class="ident">orig</span>.<span class="ident">borrow</span>.<span class="ident">clone</span>();
(<span class="ident">Ref</span> { <span class="ident">value</span>: <span class="ident">a</span>, <span class="ident">borrow</span> }, <span class="ident">Ref</span> { <span class="ident">value</span>: <span class="ident">b</span>, <span class="ident">borrow</span>: <span class="ident">orig</span>.<span class="ident">borrow</span> })
}
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"coerce_unsized"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"27732"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Unsize</span><span class="op"><</span><span class="ident">U</span><span class="op">></span>, <span class="ident">U</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">CoerceUnsized</span><span class="op"><</span><span class="ident">Ref</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">U</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">Ref</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span><span class="op">></span> {}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std_guard_impls"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.20.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Display</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">Ref</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="self">self</span>.<span class="ident">value</span>.<span class="ident">fmt</span>(<span class="ident">f</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">RefMut</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Makes a new `RefMut` for a component of the borrowed data, e.g., an enum</span>
<span class="doccomment">/// variant.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `RefCell` is already mutably borrowed, so this cannot fail.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is an associated function that needs to be used as</span>
<span class="doccomment">/// `RefMut::map(...)`. A method would interfere with methods of the same</span>
<span class="doccomment">/// name on the contents of a `RefCell` used through `Deref`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::{RefCell, RefMut};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let c = RefCell::new((5, 'b'));</span>
<span class="doccomment">/// {</span>
<span class="doccomment">/// let b1: RefMut<(u32, char)> = c.borrow_mut();</span>
<span class="doccomment">/// let mut b2: RefMut<u32> = RefMut::map(b1, |t| &mut t.0);</span>
<span class="doccomment">/// assert_eq!(*b2, 5);</span>
<span class="doccomment">/// *b2 = 42;</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// assert_eq!(*c.borrow(), (42, 'b'));</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"cell_map"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.8.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">map</span><span class="op"><</span><span class="ident">U</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">F</span><span class="op">></span>(<span class="ident">orig</span>: <span class="ident">RefMut</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span><span class="op">></span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="ident">RefMut</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">U</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">U</span>
{
<span class="comment">// FIXME(nll-rfc#40): fix borrow-check</span>
<span class="kw">let</span> <span class="ident">RefMut</span> { <span class="ident">value</span>, <span class="ident">borrow</span> } <span class="op">=</span> <span class="ident">orig</span>;
<span class="ident">RefMut</span> {
<span class="ident">value</span>: <span class="ident">f</span>(<span class="ident">value</span>),
<span class="ident">borrow</span>,
}
}
<span class="doccomment">/// Splits a `RefMut` into multiple `RefMut`s for different components of the</span>
<span class="doccomment">/// borrowed data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The underlying `RefCell` will remain mutably borrowed until both</span>
<span class="doccomment">/// returned `RefMut`s go out of scope.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `RefCell` is already mutably borrowed, so this cannot fail.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is an associated function that needs to be used as</span>
<span class="doccomment">/// `RefMut::map_split(...)`. A method would interfere with methods of the</span>
<span class="doccomment">/// same name on the contents of a `RefCell` used through `Deref`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::{RefCell, RefMut};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let cell = RefCell::new([1, 2, 3, 4]);</span>
<span class="doccomment">/// let borrow = cell.borrow_mut();</span>
<span class="doccomment">/// let (mut begin, mut end) = RefMut::map_split(borrow, |slice| slice.split_at_mut(2));</span>
<span class="doccomment">/// assert_eq!(*begin, [1, 2]);</span>
<span class="doccomment">/// assert_eq!(*end, [3, 4]);</span>
<span class="doccomment">/// begin.copy_from_slice(&[4, 3]);</span>
<span class="doccomment">/// end.copy_from_slice(&[2, 1]);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"refcell_map_split"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.35.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">map_split</span><span class="op"><</span><span class="ident">U</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">V</span>: <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">F</span><span class="op">></span>(
<span class="ident">orig</span>: <span class="ident">RefMut</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span><span class="op">></span>, <span class="ident">f</span>: <span class="ident">F</span>
) <span class="op">-></span> (<span class="ident">RefMut</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">U</span><span class="op">></span>, <span class="ident">RefMut</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">V</span><span class="op">></span>)
<span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-></span> (<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">U</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">V</span>)
{
<span class="kw">let</span> (<span class="ident">a</span>, <span class="ident">b</span>) <span class="op">=</span> <span class="ident">f</span>(<span class="ident">orig</span>.<span class="ident">value</span>);
<span class="kw">let</span> <span class="ident">borrow</span> <span class="op">=</span> <span class="ident">orig</span>.<span class="ident">borrow</span>.<span class="ident">clone</span>();
(<span class="ident">RefMut</span> { <span class="ident">value</span>: <span class="ident">a</span>, <span class="ident">borrow</span> }, <span class="ident">RefMut</span> { <span class="ident">value</span>: <span class="ident">b</span>, <span class="ident">borrow</span>: <span class="ident">orig</span>.<span class="ident">borrow</span> })
}
}
<span class="kw">struct</span> <span class="ident">BorrowRefMut</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span> {
<span class="ident">borrow</span>: <span class="kw-2">&</span><span class="lifetime">'b</span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">BorrowFlag</span><span class="op">></span>,
}
<span class="kw">impl</span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">BorrowRefMut</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="kw">let</span> <span class="ident">borrow</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">borrow</span>.<span class="ident">get</span>();
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">is_writing</span>(<span class="ident">borrow</span>));
<span class="self">self</span>.<span class="ident">borrow</span>.<span class="ident">set</span>(<span class="ident">borrow</span> <span class="op">+</span> <span class="number">1</span>);
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span> <span class="ident">BorrowRefMut</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">borrow</span>: <span class="kw-2">&</span><span class="lifetime">'b</span> <span class="ident">Cell</span><span class="op"><</span><span class="ident">BorrowFlag</span><span class="op">></span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">BorrowRefMut</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">>></span> {
<span class="comment">// NOTE: Unlike BorrowRefMut::clone, new is called to create the initial</span>
<span class="comment">// mutable reference, and so there must currently be no existing</span>
<span class="comment">// references. Thus, while clone increments the mutable refcount, here</span>
<span class="comment">// we explicitly only allow going from UNUSED to UNUSED - 1.</span>
<span class="kw">match</span> <span class="ident">borrow</span>.<span class="ident">get</span>() {
<span class="ident">UNUSED</span> <span class="op">=></span> {
<span class="ident">borrow</span>.<span class="ident">set</span>(<span class="ident">UNUSED</span> <span class="op">-</span> <span class="number">1</span>);
<span class="prelude-val">Some</span>(<span class="ident">BorrowRefMut</span> { <span class="ident">borrow</span> })
},
<span class="kw">_</span> <span class="op">=></span> <span class="prelude-val">None</span>,
}
}
<span class="comment">// Clone a `BorrowRefMut`.</span>
<span class="comment">//</span>
<span class="comment">// This is only valid if each `BorrowRefMut` is used to track a mutable</span>
<span class="comment">// reference to a distinct, nonoverlapping range of the original object.</span>
<span class="comment">// This isn't in a Clone impl so that code doesn't call this implicitly.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">BorrowRefMut</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">borrow</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">borrow</span>.<span class="ident">get</span>();
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">is_writing</span>(<span class="ident">borrow</span>));
<span class="comment">// Prevent the borrow counter from underflowing.</span>
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">borrow</span> <span class="op">!=</span> <span class="ident">isize</span>::<span class="ident">min_value</span>());
<span class="self">self</span>.<span class="ident">borrow</span>.<span class="ident">set</span>(<span class="ident">borrow</span> <span class="op">-</span> <span class="number">1</span>);
<span class="ident">BorrowRefMut</span> { <span class="ident">borrow</span>: <span class="self">self</span>.<span class="ident">borrow</span> }
}
}
<span class="doccomment">/// A wrapper type for a mutably borrowed value from a `RefCell<T>`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See the [module-level documentation](index.html) for more.</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">RefMut</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="lifetime">'b</span><span class="op">></span> {
<span class="ident">value</span>: <span class="kw-2">&</span><span class="lifetime">'b</span> <span class="kw-2">mut</span> <span class="ident">T</span>,
<span class="ident">borrow</span>: <span class="ident">BorrowRefMut</span><span class="op"><</span><span class="lifetime">'b</span><span class="op">></span>,
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">Deref</span> <span class="kw">for</span> <span class="ident">RefMut</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Target</span> <span class="op">=</span> <span class="ident">T</span>;
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">deref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">T</span> {
<span class="self">self</span>.<span class="ident">value</span>
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">DerefMut</span> <span class="kw">for</span> <span class="ident">RefMut</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">deref_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="self">self</span>.<span class="ident">value</span>
}
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"coerce_unsized"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"27732"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">Unsize</span><span class="op"><</span><span class="ident">U</span><span class="op">></span>, <span class="ident">U</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">CoerceUnsized</span><span class="op"><</span><span class="ident">RefMut</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">U</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">RefMut</span><span class="op"><</span><span class="lifetime">'b</span>, <span class="ident">T</span><span class="op">></span> {}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std_guard_impls"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.20.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Display</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">RefMut</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="self">self</span>.<span class="ident">value</span>.<span class="ident">fmt</span>(<span class="ident">f</span>)
}
}
<span class="doccomment">/// The core primitive for interior mutability in Rust.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `UnsafeCell<T>` is a type that wraps some `T` and indicates unsafe interior operations on the</span>
<span class="doccomment">/// wrapped type. Types with an `UnsafeCell<T>` field are considered to have an 'unsafe interior'.</span>
<span class="doccomment">/// The `UnsafeCell<T>` type is the only legal way to obtain aliasable data that is considered</span>
<span class="doccomment">/// mutable. In general, transmuting an `&T` type into an `&mut T` is considered undefined behavior.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If you have a reference `&SomeStruct`, then normally in Rust all fields of `SomeStruct` are</span>
<span class="doccomment">/// immutable. The compiler makes optimizations based on the knowledge that `&T` is not mutably</span>
<span class="doccomment">/// aliased or mutated, and that `&mut T` is unique. `UnsafeCell<T>` is the only core language</span>
<span class="doccomment">/// feature to work around this restriction. All other types that allow internal mutability, such as</span>
<span class="doccomment">/// `Cell<T>` and `RefCell<T>`, use `UnsafeCell` to wrap their internal data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `UnsafeCell` API itself is technically very simple: it gives you a raw pointer `*mut T` to</span>
<span class="doccomment">/// its contents. It is up to _you_ as the abstraction designer to use that raw pointer correctly.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The precise Rust aliasing rules are somewhat in flux, but the main points are not contentious:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// - If you create a safe reference with lifetime `'a` (either a `&T` or `&mut T`</span>
<span class="doccomment">/// reference) that is accessible by safe code (for example, because you returned it),</span>
<span class="doccomment">/// then you must not access the data in any way that contradicts that reference for the</span>
<span class="doccomment">/// remainder of `'a`. For example, this means that if you take the `*mut T` from an</span>
<span class="doccomment">/// `UnsafeCell<T>` and cast it to an `&T`, then the data in `T` must remain immutable</span>
<span class="doccomment">/// (modulo any `UnsafeCell` data found within `T`, of course) until that reference's</span>
<span class="doccomment">/// lifetime expires. Similarly, if you create a `&mut T` reference that is released to</span>
<span class="doccomment">/// safe code, then you must not access the data within the `UnsafeCell` until that</span>
<span class="doccomment">/// reference expires.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// - At all times, you must avoid data races. If multiple threads have access to</span>
<span class="doccomment">/// the same `UnsafeCell`, then any writes must have a proper happens-before relation to all other</span>
<span class="doccomment">/// accesses (or use atomics).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// To assist with proper design, the following scenarios are explicitly declared legal</span>
<span class="doccomment">/// for single-threaded code:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// 1. A `&T` reference can be released to safe code and there it can co-exist with other `&T`</span>
<span class="doccomment">/// references, but not with a `&mut T`</span>
<span class="doccomment">///</span>
<span class="doccomment">/// 2. A `&mut T` reference may be released to safe code provided neither other `&mut T` nor `&T`</span>
<span class="doccomment">/// co-exist with it. A `&mut T` must always be unique.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that while mutating or mutably aliasing the contents of an `&UnsafeCell<T>` is</span>
<span class="doccomment">/// ok (provided you enforce the invariants some other way), it is still undefined behavior</span>
<span class="doccomment">/// to have multiple `&mut UnsafeCell<T>` aliases.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::UnsafeCell;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # #[allow(dead_code)]</span>
<span class="doccomment">/// struct NotThreadSafe<T> {</span>
<span class="doccomment">/// value: UnsafeCell<T>,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// unsafe impl<T> Sync for NotThreadSafe<T> {}</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">lang</span> <span class="op">=</span> <span class="string">"unsafe_cell"</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">transparent</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">UnsafeCell</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> {
<span class="ident">value</span>: <span class="ident">T</span>,
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="op">!</span><span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">UnsafeCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">UnsafeCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Constructs a new instance of `UnsafeCell` which will wrap the specified</span>
<span class="doccomment">/// value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// All access to the inner value through methods is `unsafe`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::UnsafeCell;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let uc = UnsafeCell::new(5);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">value</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">UnsafeCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">UnsafeCell</span> { <span class="ident">value</span> }
}
<span class="doccomment">/// Unwraps the value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::UnsafeCell;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let uc = UnsafeCell::new(5);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let five = uc.into_inner();</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_inner</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">T</span> {
<span class="self">self</span>.<span class="ident">value</span>
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">UnsafeCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Gets a mutable pointer to the wrapped value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This can be cast to a pointer of any kind.</span>
<span class="doccomment">/// Ensure that the access is unique (no active references, mutable or not)</span>
<span class="doccomment">/// when casting to `&mut T`, and ensure that there are no mutations</span>
<span class="doccomment">/// or mutable aliases going on when casting to `&T`</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::cell::UnsafeCell;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let uc = UnsafeCell::new(5);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let five = uc.get();</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">get</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="comment">// We can just cast the pointer from `UnsafeCell<T>` to `T` because of</span>
<span class="comment">// #[repr(transparent)]</span>
<span class="self">self</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">UnsafeCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"unsafe_cell_default"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.10.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Default</span><span class="op">></span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">UnsafeCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Creates an `UnsafeCell`, with the `Default` value for T.</span>
<span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-></span> <span class="ident">UnsafeCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">UnsafeCell</span>::<span class="ident">new</span>(<span class="ident">Default</span>::<span class="ident">default</span>())
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"cell_from"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.12.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">UnsafeCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">t</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">UnsafeCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">UnsafeCell</span>::<span class="ident">new</span>(<span class="ident">t</span>)
}
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"coerce_unsized"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"27732"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">CoerceUnsized</span><span class="op"><</span><span class="ident">U</span><span class="op">></span>, <span class="ident">U</span><span class="op">></span> <span class="ident">CoerceUnsized</span><span class="op"><</span><span class="ident">UnsafeCell</span><span class="op"><</span><span class="ident">U</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">UnsafeCell</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused</span>)]</span>
<span class="kw">fn</span> <span class="ident">assert_coerce_unsized</span>(<span class="ident">a</span>: <span class="ident">UnsafeCell</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">i32</span><span class="op">></span>, <span class="ident">b</span>: <span class="ident">Cell</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">i32</span><span class="op">></span>, <span class="ident">c</span>: <span class="ident">RefCell</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">i32</span><span class="op">></span>) {
<span class="kw">let</span> <span class="kw">_</span>: <span class="ident">UnsafeCell</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">dyn</span> <span class="ident">Send</span><span class="op">></span> <span class="op">=</span> <span class="ident">a</span>;
<span class="kw">let</span> <span class="kw">_</span>: <span class="ident">Cell</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">dyn</span> <span class="ident">Send</span><span class="op">></span> <span class="op">=</span> <span class="ident">b</span>;
<span class="kw">let</span> <span class="kw">_</span>: <span class="ident">RefCell</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">dyn</span> <span class="ident">Send</span><span class="op">></span> <span class="op">=</span> <span class="ident">c</span>;
}
</pre></div>
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