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</pre><pre class="rust ">
<span class="comment">// Copyright 2014 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>
<span class="doccomment">//! A contiguous growable array type with heap-allocated contents, written</span>
<span class="doccomment">//! `Vec<T>` but pronounced 'vector.'</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Vectors have `O(1)` indexing, amortized `O(1)` push (to the end) and</span>
<span class="doccomment">//! `O(1)` pop (from the end).</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Examples</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! You can explicitly create a [`Vec<T>`] with [`new`]:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! let v: Vec<i32> = Vec::new();</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ...or by using the [`vec!`] macro:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! let v: Vec<i32> = vec![];</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! let v = vec![1, 2, 3, 4, 5];</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! let v = vec![0; 10]; // ten zeroes</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! You can [`push`] values onto the end of a vector (which will grow the vector</span>
<span class="doccomment">//! as needed):</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! let mut v = vec![1, 2];</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! v.push(3);</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Popping values works in much the same way:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! let mut v = vec![1, 2];</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! let two = v.pop();</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Vectors also support indexing (through the [`Index`] and [`IndexMut`] traits):</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! let mut v = vec![1, 2, 3];</span>
<span class="doccomment">//! let three = v[2];</span>
<span class="doccomment">//! v[1] = v[1] + 5;</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [`Vec<T>`]: ../../std/vec/struct.Vec.html</span>
<span class="doccomment">//! [`new`]: ../../std/vec/struct.Vec.html#method.new</span>
<span class="doccomment">//! [`push`]: ../../std/vec/struct.Vec.html#method.push</span>
<span class="doccomment">//! [`Index`]: ../../std/ops/trait.Index.html</span>
<span class="doccomment">//! [`IndexMut`]: ../../std/ops/trait.IndexMut.html</span>
<span class="doccomment">//! [`vec!`]: ../../std/macro.vec.html</span>
<span class="attribute">#<span class="op">!</span>[<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">alloc</span>::<span class="ident">boxed</span>::<span class="ident">Box</span>;
<span class="kw">use</span> <span class="ident">alloc</span>::<span class="ident">raw_vec</span>::<span class="ident">RawVec</span>;
<span class="kw">use</span> <span class="ident">borrow</span>::<span class="ident">ToOwned</span>;
<span class="kw">use</span> <span class="ident">borrow</span>::<span class="ident">Cow</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">cmp</span>::<span class="ident">Ordering</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">fmt</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">hash</span>::{<span class="self">self</span>, <span class="ident">Hash</span>};
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">intrinsics</span>::{<span class="ident">arith_offset</span>, <span class="ident">assume</span>};
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">iter</span>::{<span class="ident">FromIterator</span>, <span class="ident">FusedIterator</span>, <span class="ident">TrustedLen</span>};
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">mem</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">test</span>))]</span>
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">num</span>::<span class="ident">Float</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">ops</span>::{<span class="ident">InPlace</span>, <span class="ident">Index</span>, <span class="ident">IndexMut</span>, <span class="ident">Place</span>, <span class="ident">Placer</span>};
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">ops</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">ptr</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">ptr</span>::<span class="ident">Shared</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">slice</span>;
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">range</span>::<span class="ident">RangeArgument</span>;
<span class="kw">use</span> <span class="ident">Bound</span>::{<span class="ident">Excluded</span>, <span class="ident">Included</span>, <span class="ident">Unbounded</span>};
<span class="doccomment">/// A contiguous growable array type, written `Vec<T>` but pronounced 'vector'.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut vec = Vec::new();</span>
<span class="doccomment">/// vec.push(1);</span>
<span class="doccomment">/// vec.push(2);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(vec.len(), 2);</span>
<span class="doccomment">/// assert_eq!(vec[0], 1);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(vec.pop(), Some(2));</span>
<span class="doccomment">/// assert_eq!(vec.len(), 1);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// vec[0] = 7;</span>
<span class="doccomment">/// assert_eq!(vec[0], 7);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// vec.extend([1, 2, 3].iter().cloned());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// for x in &vec {</span>
<span class="doccomment">/// println!("{}", x);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// assert_eq!(vec, [7, 1, 2, 3]);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The [`vec!`] macro is provided to make initialization more convenient:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut vec = vec![1, 2, 3];</span>
<span class="doccomment">/// vec.push(4);</span>
<span class="doccomment">/// assert_eq!(vec, [1, 2, 3, 4]);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It can also initialize each element of a `Vec<T>` with a given value:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let vec = vec![0; 5];</span>
<span class="doccomment">/// assert_eq!(vec, [0, 0, 0, 0, 0]);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Use a `Vec<T>` as an efficient stack:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut stack = Vec::new();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// stack.push(1);</span>
<span class="doccomment">/// stack.push(2);</span>
<span class="doccomment">/// stack.push(3);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// while let Some(top) = stack.pop() {</span>
<span class="doccomment">/// // Prints 3, 2, 1</span>
<span class="doccomment">/// println!("{}", top);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Indexing</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `Vec` type allows to access values by index, because it implements the</span>
<span class="doccomment">/// [`Index`] trait. An example will be more explicit:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let v = vec![0, 2, 4, 6];</span>
<span class="doccomment">/// println!("{}", v[1]); // it will display '2'</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// However be careful: if you try to access an index which isn't in the `Vec`,</span>
<span class="doccomment">/// your software will panic! You cannot do this:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```ignore</span>
<span class="doccomment">/// let v = vec![0, 2, 4, 6];</span>
<span class="doccomment">/// println!("{}", v[6]); // it will panic!</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// In conclusion: always check if the index you want to get really exists</span>
<span class="doccomment">/// before doing it.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Slicing</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A `Vec` can be mutable. Slices, on the other hand, are read-only objects.</span>
<span class="doccomment">/// To get a slice, use `&`. Example:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// fn read_slice(slice: &[usize]) {</span>
<span class="doccomment">/// // ...</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let v = vec![0, 1];</span>
<span class="doccomment">/// read_slice(&v);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // ... and that's all!</span>
<span class="doccomment">/// // you can also do it like this:</span>
<span class="doccomment">/// let x : &[usize] = &v;</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// In Rust, it's more common to pass slices as arguments rather than vectors</span>
<span class="doccomment">/// when you just want to provide a read access. The same goes for [`String`] and</span>
<span class="doccomment">/// [`&str`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Capacity and reallocation</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The capacity of a vector is the amount of space allocated for any future</span>
<span class="doccomment">/// elements that will be added onto the vector. This is not to be confused with</span>
<span class="doccomment">/// the *length* of a vector, which specifies the number of actual elements</span>
<span class="doccomment">/// within the vector. If a vector's length exceeds its capacity, its capacity</span>
<span class="doccomment">/// will automatically be increased, but its elements will have to be</span>
<span class="doccomment">/// reallocated.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For example, a vector with capacity 10 and length 0 would be an empty vector</span>
<span class="doccomment">/// with space for 10 more elements. Pushing 10 or fewer elements onto the</span>
<span class="doccomment">/// vector will not change its capacity or cause reallocation to occur. However,</span>
<span class="doccomment">/// if the vector's length is increased to 11, it will have to reallocate, which</span>
<span class="doccomment">/// can be slow. For this reason, it is recommended to use [`Vec::with_capacity`]</span>
<span class="doccomment">/// whenever possible to specify how big the vector is expected to get.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Guarantees</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Due to its incredibly fundamental nature, `Vec` makes a lot of guarantees</span>
<span class="doccomment">/// about its design. This ensures that it's as low-overhead as possible in</span>
<span class="doccomment">/// the general case, and can be correctly manipulated in primitive ways</span>
<span class="doccomment">/// by unsafe code. Note that these guarantees refer to an unqualified `Vec<T>`.</span>
<span class="doccomment">/// If additional type parameters are added (e.g. to support custom allocators),</span>
<span class="doccomment">/// overriding their defaults may change the behavior.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Most fundamentally, `Vec` is and always will be a (pointer, capacity, length)</span>
<span class="doccomment">/// triplet. No more, no less. The order of these fields is completely</span>
<span class="doccomment">/// unspecified, and you should use the appropriate methods to modify these.</span>
<span class="doccomment">/// The pointer will never be null, so this type is null-pointer-optimized.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// However, the pointer may not actually point to allocated memory. In particular,</span>
<span class="doccomment">/// if you construct a `Vec` with capacity 0 via [`Vec::new`], [`vec![]`][`vec!`],</span>
<span class="doccomment">/// [`Vec::with_capacity(0)`][`Vec::with_capacity`], or by calling [`shrink_to_fit`]</span>
<span class="doccomment">/// on an empty Vec, it will not allocate memory. Similarly, if you store zero-sized</span>
<span class="doccomment">/// types inside a `Vec`, it will not allocate space for them. *Note that in this case</span>
<span class="doccomment">/// the `Vec` may not report a [`capacity`] of 0*. `Vec` will allocate if and only</span>
<span class="doccomment">/// if [`mem::size_of::<T>`]` * capacity() > 0`. In general, `Vec`'s allocation</span>
<span class="doccomment">/// details are subtle enough that it is strongly recommended that you only</span>
<span class="doccomment">/// free memory allocated by a `Vec` by creating a new `Vec` and dropping it.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If a `Vec` *has* allocated memory, then the memory it points to is on the heap</span>
<span class="doccomment">/// (as defined by the allocator Rust is configured to use by default), and its</span>
<span class="doccomment">/// pointer points to [`len`] initialized elements in order (what you would see</span>
<span class="doccomment">/// if you coerced it to a slice), followed by [`capacity`]` - `[`len`]</span>
<span class="doccomment">/// logically uninitialized elements.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `Vec` will never perform a "small optimization" where elements are actually</span>
<span class="doccomment">/// stored on the stack for two reasons:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * It would make it more difficult for unsafe code to correctly manipulate</span>
<span class="doccomment">/// a `Vec`. The contents of a `Vec` wouldn't have a stable address if it were</span>
<span class="doccomment">/// only moved, and it would be more difficult to determine if a `Vec` had</span>
<span class="doccomment">/// actually allocated memory.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * It would penalize the general case, incurring an additional branch</span>
<span class="doccomment">/// on every access.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `Vec` will never automatically shrink itself, even if completely empty. This</span>
<span class="doccomment">/// ensures no unnecessary allocations or deallocations occur. Emptying a `Vec`</span>
<span class="doccomment">/// and then filling it back up to the same [`len`] should incur no calls to</span>
<span class="doccomment">/// the allocator. If you wish to free up unused memory, use</span>
<span class="doccomment">/// [`shrink_to_fit`][`shrink_to_fit`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`push`] and [`insert`] will never (re)allocate if the reported capacity is</span>
<span class="doccomment">/// sufficient. [`push`] and [`insert`] *will* (re)allocate if</span>
<span class="doccomment">/// [`len`]` == `[`capacity`]. That is, the reported capacity is completely</span>
<span class="doccomment">/// accurate, and can be relied on. It can even be used to manually free the memory</span>
<span class="doccomment">/// allocated by a `Vec` if desired. Bulk insertion methods *may* reallocate, even</span>
<span class="doccomment">/// when not necessary.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `Vec` does not guarantee any particular growth strategy when reallocating</span>
<span class="doccomment">/// when full, nor when [`reserve`] is called. The current strategy is basic</span>
<span class="doccomment">/// and it may prove desirable to use a non-constant growth factor. Whatever</span>
<span class="doccomment">/// strategy is used will of course guarantee `O(1)` amortized [`push`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `vec![x; n]`, `vec![a, b, c, d]`, and</span>
<span class="doccomment">/// [`Vec::with_capacity(n)`][`Vec::with_capacity`], will all produce a `Vec`</span>
<span class="doccomment">/// with exactly the requested capacity. If [`len`]` == `[`capacity`],</span>
<span class="doccomment">/// (as is the case for the [`vec!`] macro), then a `Vec<T>` can be converted to</span>
<span class="doccomment">/// and from a [`Box<[T]>`][owned slice] without reallocating or moving the elements.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `Vec` will not specifically overwrite any data that is removed from it,</span>
<span class="doccomment">/// but also won't specifically preserve it. Its uninitialized memory is</span>
<span class="doccomment">/// scratch space that it may use however it wants. It will generally just do</span>
<span class="doccomment">/// whatever is most efficient or otherwise easy to implement. Do not rely on</span>
<span class="doccomment">/// removed data to be erased for security purposes. Even if you drop a `Vec`, its</span>
<span class="doccomment">/// buffer may simply be reused by another `Vec`. Even if you zero a `Vec`'s memory</span>
<span class="doccomment">/// first, that may not actually happen because the optimizer does not consider</span>
<span class="doccomment">/// this a side-effect that must be preserved. There is one case which we will</span>
<span class="doccomment">/// not break, however: using `unsafe` code to write to the excess capacity,</span>
<span class="doccomment">/// and then increasing the length to match, is always valid.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `Vec` does not currently guarantee the order in which elements are dropped</span>
<span class="doccomment">/// (the order has changed in the past, and may change again).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`vec!`]: ../../std/macro.vec.html</span>
<span class="doccomment">/// [`Index`]: ../../std/ops/trait.Index.html</span>
<span class="doccomment">/// [`String`]: ../../std/string/struct.String.html</span>
<span class="doccomment">/// [`&str`]: ../../std/primitive.str.html</span>
<span class="doccomment">/// [`Vec::with_capacity`]: ../../std/vec/struct.Vec.html#method.with_capacity</span>
<span class="doccomment">/// [`Vec::new`]: ../../std/vec/struct.Vec.html#method.new</span>
<span class="doccomment">/// [`shrink_to_fit`]: ../../std/vec/struct.Vec.html#method.shrink_to_fit</span>
<span class="doccomment">/// [`capacity`]: ../../std/vec/struct.Vec.html#method.capacity</span>
<span class="doccomment">/// [`mem::size_of::<T>`]: ../../std/mem/fn.size_of.html</span>
<span class="doccomment">/// [`len`]: ../../std/vec/struct.Vec.html#method.len</span>
<span class="doccomment">/// [`push`]: ../../std/vec/struct.Vec.html#method.push</span>
<span class="doccomment">/// [`insert`]: ../../std/vec/struct.Vec.html#method.insert</span>
<span class="doccomment">/// [`reserve`]: ../../std/vec/struct.Vec.html#method.reserve</span>
<span class="doccomment">/// [owned slice]: ../../std/boxed/struct.Box.html</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">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">buf</span>: <span class="ident">RawVec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
<span class="ident">len</span>: <span class="ident">usize</span>,
}
<span class="comment">////////////////////////////////////////////////////////////////////////////////</span>
<span class="comment">// Inherent methods</span>
<span class="comment">////////////////////////////////////////////////////////////////////////////////</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Constructs a new, empty `Vec<T>`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The vector will not allocate until elements are pushed onto it.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #![allow(unused_mut)]</span>
<span class="doccomment">/// let mut vec: Vec<i32> = Vec::new();</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">new</span>() <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">Vec</span> {
<span class="ident">buf</span>: <span class="ident">RawVec</span>::<span class="ident">new</span>(),
<span class="ident">len</span>: <span class="number">0</span>,
}
}
<span class="doccomment">/// Constructs a new, empty `Vec<T>` with the specified capacity.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The vector will be able to hold exactly `capacity` elements without</span>
<span class="doccomment">/// reallocating. If `capacity` is 0, the vector will not allocate.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It is important to note that this function does not specify the *length*</span>
<span class="doccomment">/// of the returned vector, but only the *capacity*. For an explanation of</span>
<span class="doccomment">/// the difference between length and capacity, see *[Capacity and reallocation]*.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [Capacity and reallocation]: #capacity-and-reallocation</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut vec = Vec::with_capacity(10);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // The vector contains no items, even though it has capacity for more</span>
<span class="doccomment">/// assert_eq!(vec.len(), 0);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // These are all done without reallocating...</span>
<span class="doccomment">/// for i in 0..10 {</span>
<span class="doccomment">/// vec.push(i);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // ...but this may make the vector reallocate</span>
<span class="doccomment">/// vec.push(11);</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">with_capacity</span>(<span class="ident">capacity</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">Vec</span> {
<span class="ident">buf</span>: <span class="ident">RawVec</span>::<span class="ident">with_capacity</span>(<span class="ident">capacity</span>),
<span class="ident">len</span>: <span class="number">0</span>,
}
}
<span class="doccomment">/// Creates a `Vec<T>` directly from the raw components of another vector.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is highly unsafe, due to the number of invariants that aren't</span>
<span class="doccomment">/// checked:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * `ptr` needs to have been previously allocated via [`String`]/`Vec<T>`</span>
<span class="doccomment">/// (at least, it's highly likely to be incorrect if it wasn't).</span>
<span class="doccomment">/// * `length` needs to be less than or equal to `capacity`.</span>
<span class="doccomment">/// * `capacity` needs to be the capacity that the pointer was allocated with.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Violating these may cause problems like corrupting the allocator's</span>
<span class="doccomment">/// internal datastructures. For example it is **not** safe</span>
<span class="doccomment">/// to build a `Vec<u8>` from a pointer to a C `char` array and a `size_t`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The ownership of `ptr` is effectively transferred to the</span>
<span class="doccomment">/// `Vec<T>` which may then deallocate, reallocate or change the</span>
<span class="doccomment">/// contents of memory pointed to by the pointer at will. Ensure</span>
<span class="doccomment">/// that nothing else uses the pointer after calling this</span>
<span class="doccomment">/// function.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`String`]: ../../std/string/struct.String.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::ptr;</span>
<span class="doccomment">/// use std::mem;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() {</span>
<span class="doccomment">/// let mut v = vec![1, 2, 3];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Pull out the various important pieces of information about `v`</span>
<span class="doccomment">/// let p = v.as_mut_ptr();</span>
<span class="doccomment">/// let len = v.len();</span>
<span class="doccomment">/// let cap = v.capacity();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// unsafe {</span>
<span class="doccomment">/// // Cast `v` into the void: no destructor run, so we are in</span>
<span class="doccomment">/// // complete control of the allocation to which `p` points.</span>
<span class="doccomment">/// mem::forget(v);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Overwrite memory with 4, 5, 6</span>
<span class="doccomment">/// for i in 0..len as isize {</span>
<span class="doccomment">/// ptr::write(p.offset(i), 4 + i);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Put everything back together into a Vec</span>
<span class="doccomment">/// let rebuilt = Vec::from_raw_parts(p, len, cap);</span>
<span class="doccomment">/// assert_eq!(rebuilt, [4, 5, 6]);</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">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">from_raw_parts</span>(<span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>, <span class="ident">length</span>: <span class="ident">usize</span>, <span class="ident">capacity</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">Vec</span> {
<span class="ident">buf</span>: <span class="ident">RawVec</span>::<span class="ident">from_raw_parts</span>(<span class="ident">ptr</span>, <span class="ident">capacity</span>),
<span class="ident">len</span>: <span class="ident">length</span>,
}
}
<span class="doccomment">/// Returns the number of elements the vector can hold without</span>
<span class="doccomment">/// reallocating.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let vec: Vec<i32> = Vec::with_capacity(10);</span>
<span class="doccomment">/// assert_eq!(vec.capacity(), 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">capacity</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">cap</span>()
}
<span class="doccomment">/// Reserves capacity for at least `additional` more elements to be inserted</span>
<span class="doccomment">/// in the given `Vec<T>`. The collection may reserve more space to avoid</span>
<span class="doccomment">/// frequent reallocations. After calling `reserve`, capacity will be</span>
<span class="doccomment">/// greater than or equal to `self.len() + additional`. Does nothing if</span>
<span class="doccomment">/// capacity is already sufficient.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the new capacity overflows `usize`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut vec = vec![1];</span>
<span class="doccomment">/// vec.reserve(10);</span>
<span class="doccomment">/// assert!(vec.capacity() >= 11);</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">pub</span> <span class="kw">fn</span> <span class="ident">reserve</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">additional</span>: <span class="ident">usize</span>) {
<span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">reserve</span>(<span class="self">self</span>.<span class="ident">len</span>, <span class="ident">additional</span>);
}
<span class="doccomment">/// Reserves the minimum capacity for exactly `additional` more elements to</span>
<span class="doccomment">/// be inserted in the given `Vec<T>`. After calling `reserve_exact`,</span>
<span class="doccomment">/// capacity will be greater than or equal to `self.len() + additional`.</span>
<span class="doccomment">/// Does nothing if the capacity is already sufficient.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that the allocator may give the collection more space than it</span>
<span class="doccomment">/// requests. Therefore capacity can not be relied upon to be precisely</span>
<span class="doccomment">/// minimal. Prefer `reserve` if future insertions are expected.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the new capacity overflows `usize`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut vec = vec![1];</span>
<span class="doccomment">/// vec.reserve_exact(10);</span>
<span class="doccomment">/// assert!(vec.capacity() >= 11);</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">pub</span> <span class="kw">fn</span> <span class="ident">reserve_exact</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">additional</span>: <span class="ident">usize</span>) {
<span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">reserve_exact</span>(<span class="self">self</span>.<span class="ident">len</span>, <span class="ident">additional</span>);
}
<span class="doccomment">/// Shrinks the capacity of the vector as much as possible.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It will drop down as close as possible to the length but the allocator</span>
<span class="doccomment">/// may still inform the vector that there is space for a few more elements.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut vec = Vec::with_capacity(10);</span>
<span class="doccomment">/// vec.extend([1, 2, 3].iter().cloned());</span>
<span class="doccomment">/// assert_eq!(vec.capacity(), 10);</span>
<span class="doccomment">/// vec.shrink_to_fit();</span>
<span class="doccomment">/// assert!(vec.capacity() >= 3);</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">pub</span> <span class="kw">fn</span> <span class="ident">shrink_to_fit</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">shrink_to_fit</span>(<span class="self">self</span>.<span class="ident">len</span>);
}
<span class="doccomment">/// Converts the vector into [`Box<[T]>`][owned slice].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that this will drop any excess capacity. Calling this and</span>
<span class="doccomment">/// converting back to a vector with [`into_vec`] is equivalent to calling</span>
<span class="doccomment">/// [`shrink_to_fit`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [owned slice]: ../../std/boxed/struct.Box.html</span>
<span class="doccomment">/// [`into_vec`]: ../../std/primitive.slice.html#method.into_vec</span>
<span class="doccomment">/// [`shrink_to_fit`]: #method.shrink_to_fit</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let v = vec![1, 2, 3];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let slice = v.into_boxed_slice();</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Any excess capacity is removed:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut vec = Vec::with_capacity(10);</span>
<span class="doccomment">/// vec.extend([1, 2, 3].iter().cloned());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(vec.capacity(), 10);</span>
<span class="doccomment">/// let slice = vec.into_boxed_slice();</span>
<span class="doccomment">/// assert_eq!(slice.into_vec().capacity(), 3);</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">pub</span> <span class="kw">fn</span> <span class="ident">into_boxed_slice</span>(<span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">Box</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> {
<span class="kw">unsafe</span> {
<span class="self">self</span>.<span class="ident">shrink_to_fit</span>();
<span class="kw">let</span> <span class="ident">buf</span> <span class="op">=</span> <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">buf</span>);
<span class="ident">mem</span>::<span class="ident">forget</span>(<span class="self">self</span>);
<span class="ident">buf</span>.<span class="ident">into_box</span>()
}
}
<span class="doccomment">/// Shortens the vector, keeping the first `len` elements and dropping</span>
<span class="doccomment">/// the rest.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If `len` is greater than the vector's current length, this has no</span>
<span class="doccomment">/// effect.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The [`drain`] method can emulate `truncate`, but causes the excess</span>
<span class="doccomment">/// elements to be returned instead of dropped.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that this method has no effect on the allocated capacity</span>
<span class="doccomment">/// of the vector.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Truncating a five element vector to two elements:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut vec = vec![1, 2, 3, 4, 5];</span>
<span class="doccomment">/// vec.truncate(2);</span>
<span class="doccomment">/// assert_eq!(vec, [1, 2]);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// No truncation occurs when `len` is greater than the vector's current</span>
<span class="doccomment">/// length:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut vec = vec![1, 2, 3];</span>
<span class="doccomment">/// vec.truncate(8);</span>
<span class="doccomment">/// assert_eq!(vec, [1, 2, 3]);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Truncating when `len == 0` is equivalent to calling the [`clear`]</span>
<span class="doccomment">/// method.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut vec = vec![1, 2, 3];</span>
<span class="doccomment">/// vec.truncate(0);</span>
<span class="doccomment">/// assert_eq!(vec, []);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`clear`]: #method.clear</span>
<span class="doccomment">/// [`drain`]: #method.drain</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">truncate</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">len</span>: <span class="ident">usize</span>) {
<span class="kw">unsafe</span> {
<span class="comment">// drop any extra elements</span>
<span class="kw">while</span> <span class="ident">len</span> <span class="op"><</span> <span class="self">self</span>.<span class="ident">len</span> {
<span class="comment">// decrement len before the drop_in_place(), so a panic on Drop</span>
<span class="comment">// doesn't re-drop the just-failed value.</span>
<span class="self">self</span>.<span class="ident">len</span> <span class="op">-=</span> <span class="number">1</span>;
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>;
<span class="ident">ptr</span>::<span class="ident">drop_in_place</span>(<span class="self">self</span>.<span class="ident">get_unchecked_mut</span>(<span class="ident">len</span>));
}
}
}
<span class="doccomment">/// Extracts a slice containing the entire vector.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Equivalent to `&s[..]`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io::{self, Write};</span>
<span class="doccomment">/// let buffer = vec![1, 2, 3, 5, 8];</span>
<span class="doccomment">/// io::sink().write(buffer.as_slice()).unwrap();</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">"vec_as_slice"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.7.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_slice</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="doccomment">/// Extracts a mutable slice of the entire vector.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Equivalent to `&mut s[..]`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io::{self, Read};</span>
<span class="doccomment">/// let mut buffer = vec![0; 3];</span>
<span class="doccomment">/// io::repeat(0b101).read_exact(buffer.as_mut_slice()).unwrap();</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">"vec_as_slice"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.7.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_mut_slice</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="doccomment">/// Sets the length of a vector.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This will explicitly set the size of the vector, without actually</span>
<span class="doccomment">/// modifying its buffers, so it is up to the caller to ensure that the</span>
<span class="doccomment">/// vector is actually the specified size.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::ptr;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut vec = vec!['r', 'u', 's', 't'];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// unsafe {</span>
<span class="doccomment">/// ptr::drop_in_place(&mut vec[3]);</span>
<span class="doccomment">/// vec.set_len(3);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// assert_eq!(vec, ['r', 'u', 's']);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// In this example, there is a memory leak since the memory locations</span>
<span class="doccomment">/// owned by the inner vectors were not freed prior to the `set_len` call:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut vec = vec![vec![1, 0, 0],</span>
<span class="doccomment">/// vec![0, 1, 0],</span>
<span class="doccomment">/// vec![0, 0, 1]];</span>
<span class="doccomment">/// unsafe {</span>
<span class="doccomment">/// vec.set_len(0);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// In this example, the vector gets expanded from zero to four items</span>
<span class="doccomment">/// without any memory allocations occurring, resulting in vector</span>
<span class="doccomment">/// values of unallocated memory:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut vec: Vec<char> = Vec::new();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// unsafe {</span>
<span class="doccomment">/// vec.set_len(4);</span>
<span class="doccomment">/// }</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">unsafe</span> <span class="kw">fn</span> <span class="ident">set_len</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">len</span>: <span class="ident">usize</span>) {
<span class="self">self</span>.<span class="ident">len</span> <span class="op">=</span> <span class="ident">len</span>;
}
<span class="doccomment">/// Removes an element from the vector and returns it.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The removed element is replaced by the last element of the vector.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This does not preserve ordering, but is O(1).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if `index` is out of bounds.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut v = vec!["foo", "bar", "baz", "qux"];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(v.swap_remove(1), "bar");</span>
<span class="doccomment">/// assert_eq!(v, ["foo", "qux", "baz"]);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(v.swap_remove(0), "foo");</span>
<span class="doccomment">/// assert_eq!(v, ["baz", "qux"]);</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">swap_remove</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">index</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">T</span> {
<span class="kw">let</span> <span class="ident">length</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>();
<span class="self">self</span>.<span class="ident">swap</span>(<span class="ident">index</span>, <span class="ident">length</span> <span class="op">-</span> <span class="number">1</span>);
<span class="self">self</span>.<span class="ident">pop</span>().<span class="ident">unwrap</span>()
}
<span class="doccomment">/// Inserts an element at position `index` within the vector, shifting all</span>
<span class="doccomment">/// elements after it to the right.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if `index` is out of bounds.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut vec = vec![1, 2, 3];</span>
<span class="doccomment">/// vec.insert(1, 4);</span>
<span class="doccomment">/// assert_eq!(vec, [1, 4, 2, 3]);</span>
<span class="doccomment">/// vec.insert(4, 5);</span>
<span class="doccomment">/// assert_eq!(vec, [1, 4, 2, 3, 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="kw">pub</span> <span class="kw">fn</span> <span class="ident">insert</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">index</span>: <span class="ident">usize</span>, <span class="ident">element</span>: <span class="ident">T</span>) {
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">index</span> <span class="op"><=</span> <span class="ident">len</span>);
<span class="comment">// space for the new element</span>
<span class="kw">if</span> <span class="ident">len</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">cap</span>() {
<span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">double</span>();
}
<span class="kw">unsafe</span> {
<span class="comment">// infallible</span>
<span class="comment">// The spot to put the new value</span>
{
<span class="kw">let</span> <span class="ident">p</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">as_mut_ptr</span>().<span class="ident">offset</span>(<span class="ident">index</span> <span class="kw">as</span> <span class="ident">isize</span>);
<span class="comment">// Shift everything over to make space. (Duplicating the</span>
<span class="comment">// `index`th element into two consecutive places.)</span>
<span class="ident">ptr</span>::<span class="ident">copy</span>(<span class="ident">p</span>, <span class="ident">p</span>.<span class="ident">offset</span>(<span class="number">1</span>), <span class="ident">len</span> <span class="op">-</span> <span class="ident">index</span>);
<span class="comment">// Write it in, overwriting the first copy of the `index`th</span>
<span class="comment">// element.</span>
<span class="ident">ptr</span>::<span class="ident">write</span>(<span class="ident">p</span>, <span class="ident">element</span>);
}
<span class="self">self</span>.<span class="ident">set_len</span>(<span class="ident">len</span> <span class="op">+</span> <span class="number">1</span>);
}
}
<span class="doccomment">/// Removes and returns the element at position `index` within the vector,</span>
<span class="doccomment">/// shifting all elements after it to the left.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if `index` is out of bounds.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut v = vec![1, 2, 3];</span>
<span class="doccomment">/// assert_eq!(v.remove(1), 2);</span>
<span class="doccomment">/// assert_eq!(v, [1, 3]);</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">pub</span> <span class="kw">fn</span> <span class="ident">remove</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">index</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">T</span> {
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">index</span> <span class="op"><</span> <span class="ident">len</span>);
<span class="kw">unsafe</span> {
<span class="comment">// infallible</span>
<span class="kw">let</span> <span class="ident">ret</span>;
{
<span class="comment">// the place we are taking from.</span>
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">as_mut_ptr</span>().<span class="ident">offset</span>(<span class="ident">index</span> <span class="kw">as</span> <span class="ident">isize</span>);
<span class="comment">// copy it out, unsafely having a copy of the value on</span>
<span class="comment">// the stack and in the vector at the same time.</span>
<span class="ident">ret</span> <span class="op">=</span> <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="ident">ptr</span>);
<span class="comment">// Shift everything down to fill in that spot.</span>
<span class="ident">ptr</span>::<span class="ident">copy</span>(<span class="ident">ptr</span>.<span class="ident">offset</span>(<span class="number">1</span>), <span class="ident">ptr</span>, <span class="ident">len</span> <span class="op">-</span> <span class="ident">index</span> <span class="op">-</span> <span class="number">1</span>);
}
<span class="self">self</span>.<span class="ident">set_len</span>(<span class="ident">len</span> <span class="op">-</span> <span class="number">1</span>);
<span class="ident">ret</span>
}
}
<span class="doccomment">/// Retains only the elements specified by the predicate.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// In other words, remove all elements `e` such that `f(&e)` returns `false`.</span>
<span class="doccomment">/// This method operates in place and preserves the order of the retained</span>
<span class="doccomment">/// elements.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut vec = vec![1, 2, 3, 4];</span>
<span class="doccomment">/// vec.retain(|&x| x%2 == 0);</span>
<span class="doccomment">/// assert_eq!(vec, [2, 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">"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">retain</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>)
<span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span>
{
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">del</span> <span class="op">=</span> <span class="number">0</span>;
{
<span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>;
<span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">len</span> {
<span class="kw">if</span> <span class="op">!</span><span class="ident">f</span>(<span class="kw-2">&</span><span class="ident">v</span>[<span class="ident">i</span>]) {
<span class="ident">del</span> <span class="op">+=</span> <span class="number">1</span>;
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">del</span> <span class="op">></span> <span class="number">0</span> {
<span class="ident">v</span>.<span class="ident">swap</span>(<span class="ident">i</span> <span class="op">-</span> <span class="ident">del</span>, <span class="ident">i</span>);
}
}
}
<span class="kw">if</span> <span class="ident">del</span> <span class="op">></span> <span class="number">0</span> {
<span class="self">self</span>.<span class="ident">truncate</span>(<span class="ident">len</span> <span class="op">-</span> <span class="ident">del</span>);
}
}
<span class="doccomment">/// Removes consecutive elements in the vector that resolve to the same key.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the vector is sorted, this removes all duplicates.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut vec = vec![10, 20, 21, 30, 20];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// vec.dedup_by_key(|i| *i / 10);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(vec, [10, 20, 30, 20]);</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">"dedup_by"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">dedup_by_key</span><span class="op"><</span><span class="ident">F</span>, <span class="ident">K</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">key</span>: <span class="ident">F</span>) <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-></span> <span class="ident">K</span>, <span class="ident">K</span>: <span class="ident">PartialEq</span> {
<span class="self">self</span>.<span class="ident">dedup_by</span>(<span class="op">|</span><span class="ident">a</span>, <span class="ident">b</span><span class="op">|</span> <span class="ident">key</span>(<span class="ident">a</span>) <span class="op">==</span> <span class="ident">key</span>(<span class="ident">b</span>))
}
<span class="doccomment">/// Removes consecutive elements in the vector according to a predicate.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `same_bucket` function is passed references to two elements from the vector, and</span>
<span class="doccomment">/// returns `true` if the elements compare equal, or `false` if they do not. Only the first</span>
<span class="doccomment">/// of adjacent equal items is kept.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the vector is sorted, this removes all duplicates.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::ascii::AsciiExt;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut vec = vec!["foo", "bar", "Bar", "baz", "bar"];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// vec.dedup_by(|a, b| a.eq_ignore_ascii_case(b));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(vec, ["foo", "bar", "baz", "bar"]);</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">"dedup_by"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">dedup_by</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">same_bucket</span>: <span class="ident">F</span>) <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="kw-2">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="ident">bool</span> {
<span class="kw">unsafe</span> {
<span class="comment">// Although we have a mutable reference to `self`, we cannot make</span>
<span class="comment">// *arbitrary* changes. The `same_bucket` calls could panic, so we</span>
<span class="comment">// must ensure that the vector is in a valid state at all time.</span>
<span class="comment">//</span>
<span class="comment">// The way that we handle this is by using swaps; we iterate</span>
<span class="comment">// over all the elements, swapping as we go so that at the end</span>
<span class="comment">// the elements we wish to keep are in the front, and those we</span>
<span class="comment">// wish to reject are at the back. We can then truncate the</span>
<span class="comment">// vector. This operation is still O(n).</span>
<span class="comment">//</span>
<span class="comment">// Example: We start in this state, where `r` represents "next</span>
<span class="comment">// read" and `w` represents "next_write`.</span>
<span class="comment">//</span>
<span class="comment">// r</span>
<span class="comment">// +---+---+---+---+---+---+</span>
<span class="comment">// | 0 | 1 | 1 | 2 | 3 | 3 |</span>
<span class="comment">// +---+---+---+---+---+---+</span>
<span class="comment">// w</span>
<span class="comment">//</span>
<span class="comment">// Comparing self[r] against self[w-1], this is not a duplicate, so</span>
<span class="comment">// we swap self[r] and self[w] (no effect as r==w) and then increment both</span>
<span class="comment">// r and w, leaving us with:</span>
<span class="comment">//</span>
<span class="comment">// r</span>
<span class="comment">// +---+---+---+---+---+---+</span>
<span class="comment">// | 0 | 1 | 1 | 2 | 3 | 3 |</span>
<span class="comment">// +---+---+---+---+---+---+</span>
<span class="comment">// w</span>
<span class="comment">//</span>
<span class="comment">// Comparing self[r] against self[w-1], this value is a duplicate,</span>
<span class="comment">// so we increment `r` but leave everything else unchanged:</span>
<span class="comment">//</span>
<span class="comment">// r</span>
<span class="comment">// +---+---+---+---+---+---+</span>
<span class="comment">// | 0 | 1 | 1 | 2 | 3 | 3 |</span>
<span class="comment">// +---+---+---+---+---+---+</span>
<span class="comment">// w</span>
<span class="comment">//</span>
<span class="comment">// Comparing self[r] against self[w-1], this is not a duplicate,</span>
<span class="comment">// so swap self[r] and self[w] and advance r and w:</span>
<span class="comment">//</span>
<span class="comment">// r</span>
<span class="comment">// +---+---+---+---+---+---+</span>
<span class="comment">// | 0 | 1 | 2 | 1 | 3 | 3 |</span>
<span class="comment">// +---+---+---+---+---+---+</span>
<span class="comment">// w</span>
<span class="comment">//</span>
<span class="comment">// Not a duplicate, repeat:</span>
<span class="comment">//</span>
<span class="comment">// r</span>
<span class="comment">// +---+---+---+---+---+---+</span>
<span class="comment">// | 0 | 1 | 2 | 3 | 1 | 3 |</span>
<span class="comment">// +---+---+---+---+---+---+</span>
<span class="comment">// w</span>
<span class="comment">//</span>
<span class="comment">// Duplicate, advance r. End of vec. Truncate to w.</span>
<span class="kw">let</span> <span class="ident">ln</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>();
<span class="kw">if</span> <span class="ident">ln</span> <span class="op"><=</span> <span class="number">1</span> {
<span class="kw">return</span>;
}
<span class="comment">// Avoid bounds checks by using raw pointers.</span>
<span class="kw">let</span> <span class="ident">p</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">as_mut_ptr</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">r</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">1</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">w</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">1</span>;
<span class="kw">while</span> <span class="ident">r</span> <span class="op"><</span> <span class="ident">ln</span> {
<span class="kw">let</span> <span class="ident">p_r</span> <span class="op">=</span> <span class="ident">p</span>.<span class="ident">offset</span>(<span class="ident">r</span> <span class="kw">as</span> <span class="ident">isize</span>);
<span class="kw">let</span> <span class="ident">p_wm1</span> <span class="op">=</span> <span class="ident">p</span>.<span class="ident">offset</span>((<span class="ident">w</span> <span class="op">-</span> <span class="number">1</span>) <span class="kw">as</span> <span class="ident">isize</span>);
<span class="kw">if</span> <span class="op">!</span><span class="ident">same_bucket</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">p_r</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">p_wm1</span>) {
<span class="kw">if</span> <span class="ident">r</span> <span class="op">!=</span> <span class="ident">w</span> {
<span class="kw">let</span> <span class="ident">p_w</span> <span class="op">=</span> <span class="ident">p_wm1</span>.<span class="ident">offset</span>(<span class="number">1</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="ident">p_r</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">p_w</span>);
}
<span class="ident">w</span> <span class="op">+=</span> <span class="number">1</span>;
}
<span class="ident">r</span> <span class="op">+=</span> <span class="number">1</span>;
}
<span class="self">self</span>.<span class="ident">truncate</span>(<span class="ident">w</span>);
}
}
<span class="doccomment">/// Appends an element to the back of a collection.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the number of elements in the vector overflows a `usize`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut vec = vec![1, 2];</span>
<span class="doccomment">/// vec.push(3);</span>
<span class="doccomment">/// assert_eq!(vec, [1, 2, 3]);</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">push</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">T</span>) {
<span class="comment">// This will panic or abort if we would allocate > isize::MAX bytes</span>
<span class="comment">// or if the length increment would overflow for zero-sized types.</span>
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">len</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">cap</span>() {
<span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">double</span>();
}
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">as_mut_ptr</span>().<span class="ident">offset</span>(<span class="self">self</span>.<span class="ident">len</span> <span class="kw">as</span> <span class="ident">isize</span>);
<span class="ident">ptr</span>::<span class="ident">write</span>(<span class="ident">end</span>, <span class="ident">value</span>);
<span class="self">self</span>.<span class="ident">len</span> <span class="op">+=</span> <span class="number">1</span>;
}
}
<span class="doccomment">/// Returns a place for insertion at the back of the `Vec`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Using this method with placement syntax is equivalent to [`push`](#method.push),</span>
<span class="doccomment">/// but may be more efficient.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(collection_placement)]</span>
<span class="doccomment">/// #![feature(placement_in_syntax)]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut vec = vec![1, 2];</span>
<span class="doccomment">/// vec.place_back() <- 3;</span>
<span class="doccomment">/// vec.place_back() <- 4;</span>
<span class="doccomment">/// assert_eq!(&vec, &[1, 2, 3, 4]);</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">"collection_placement"</span>,
<span class="ident">reason</span> <span class="op">=</span> <span class="string">"placement protocol is subject to change"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"30172"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">place_back</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">PlaceBack</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">PlaceBack</span> { <span class="ident">vec</span>: <span class="self">self</span> }
}
<span class="doccomment">/// Removes the last element from a vector and returns it, or [`None`] if it</span>
<span class="doccomment">/// is empty.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`None`]: ../../std/option/enum.Option.html#variant.None</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut vec = vec![1, 2, 3];</span>
<span class="doccomment">/// assert_eq!(vec.pop(), Some(3));</span>
<span class="doccomment">/// assert_eq!(vec, [1, 2]);</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">pop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">len</span> <span class="op">==</span> <span class="number">0</span> {
<span class="prelude-val">None</span>
} <span class="kw">else</span> {
<span class="kw">unsafe</span> {
<span class="self">self</span>.<span class="ident">len</span> <span class="op">-=</span> <span class="number">1</span>;
<span class="prelude-val">Some</span>(<span class="ident">ptr</span>::<span class="ident">read</span>(<span class="self">self</span>.<span class="ident">get_unchecked</span>(<span class="self">self</span>.<span class="ident">len</span>())))
}
}
}
<span class="doccomment">/// Moves all the elements of `other` into `Self`, leaving `other` empty.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the number of elements in the vector overflows a `usize`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut vec = vec![1, 2, 3];</span>
<span class="doccomment">/// let mut vec2 = vec![4, 5, 6];</span>
<span class="doccomment">/// vec.append(&mut vec2);</span>
<span class="doccomment">/// assert_eq!(vec, [1, 2, 3, 4, 5, 6]);</span>
<span class="doccomment">/// assert_eq!(vec2, []);</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">"append"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.4.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">append</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span>) {
<span class="kw">unsafe</span> {
<span class="self">self</span>.<span class="ident">append_elements</span>(<span class="ident">other</span>.<span class="ident">as_slice</span>() <span class="kw">as</span> _);
<span class="ident">other</span>.<span class="ident">set_len</span>(<span class="number">0</span>);
}
}
<span class="doccomment">/// Appends elements to `Self` from other buffer.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">append_elements</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">*</span><span class="kw">const</span> [<span class="ident">T</span>]) {
<span class="kw">let</span> <span class="ident">count</span> <span class="op">=</span> (<span class="kw-2">*</span><span class="ident">other</span>).<span class="ident">len</span>();
<span class="self">self</span>.<span class="ident">reserve</span>(<span class="ident">count</span>);
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>();
<span class="ident">ptr</span>::<span class="ident">copy_nonoverlapping</span>(<span class="ident">other</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>, <span class="self">self</span>.<span class="ident">get_unchecked_mut</span>(<span class="ident">len</span>), <span class="ident">count</span>);
<span class="self">self</span>.<span class="ident">len</span> <span class="op">+=</span> <span class="ident">count</span>;
}
<span class="doccomment">/// Creates a draining iterator that removes the specified range in the vector</span>
<span class="doccomment">/// and yields the removed items.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note 1: The element range is removed even if the iterator is only</span>
<span class="doccomment">/// partially consumed or not consumed at all.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note 2: It is unspecified how many elements are removed from the vector</span>
<span class="doccomment">/// if the `Drain` value is leaked.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the starting point is greater than the end point or if</span>
<span class="doccomment">/// the end point is greater than the length of the vector.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut v = vec![1, 2, 3];</span>
<span class="doccomment">/// let u: Vec<_> = v.drain(1..).collect();</span>
<span class="doccomment">/// assert_eq!(v, &[1]);</span>
<span class="doccomment">/// assert_eq!(u, &[2, 3]);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // A full range clears the vector</span>
<span class="doccomment">/// v.drain(..);</span>
<span class="doccomment">/// assert_eq!(v, &[]);</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">"drain"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">drain</span><span class="op"><</span><span class="ident">R</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">range</span>: <span class="ident">R</span>) <span class="op">-></span> <span class="ident">Drain</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">R</span>: <span class="ident">RangeArgument</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>
{
<span class="comment">// Memory safety</span>
<span class="comment">//</span>
<span class="comment">// When the Drain is first created, it shortens the length of</span>
<span class="comment">// the source vector to make sure no uninitalized or moved-from elements</span>
<span class="comment">// are accessible at all if the Drain's destructor never gets to run.</span>
<span class="comment">//</span>
<span class="comment">// Drain will ptr::read out the values to remove.</span>
<span class="comment">// When finished, remaining tail of the vec is copied back to cover</span>
<span class="comment">// the hole, and the vector length is restored to the new length.</span>
<span class="comment">//</span>
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>();
<span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">range</span>.<span class="ident">start</span>() {
<span class="ident">Included</span>(<span class="kw-2">&</span><span class="ident">n</span>) <span class="op">=></span> <span class="ident">n</span>,
<span class="ident">Excluded</span>(<span class="kw-2">&</span><span class="ident">n</span>) <span class="op">=></span> <span class="ident">n</span> <span class="op">+</span> <span class="number">1</span>,
<span class="ident">Unbounded</span> <span class="op">=></span> <span class="number">0</span>,
};
<span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">range</span>.<span class="ident">end</span>() {
<span class="ident">Included</span>(<span class="kw-2">&</span><span class="ident">n</span>) <span class="op">=></span> <span class="ident">n</span> <span class="op">+</span> <span class="number">1</span>,
<span class="ident">Excluded</span>(<span class="kw-2">&</span><span class="ident">n</span>) <span class="op">=></span> <span class="ident">n</span>,
<span class="ident">Unbounded</span> <span class="op">=></span> <span class="ident">len</span>,
};
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">start</span> <span class="op"><=</span> <span class="ident">end</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">end</span> <span class="op"><=</span> <span class="ident">len</span>);
<span class="kw">unsafe</span> {
<span class="comment">// set self.vec length's to start, to be safe in case Drain is leaked</span>
<span class="self">self</span>.<span class="ident">set_len</span>(<span class="ident">start</span>);
<span class="comment">// Use the borrow in the IterMut to indicate borrowing behavior of the</span>
<span class="comment">// whole Drain iterator (like &mut T).</span>
<span class="kw">let</span> <span class="ident">range_slice</span> <span class="op">=</span> <span class="ident">slice</span>::<span class="ident">from_raw_parts_mut</span>(<span class="self">self</span>.<span class="ident">as_mut_ptr</span>().<span class="ident">offset</span>(<span class="ident">start</span> <span class="kw">as</span> <span class="ident">isize</span>),
<span class="ident">end</span> <span class="op">-</span> <span class="ident">start</span>);
<span class="ident">Drain</span> {
<span class="ident">tail_start</span>: <span class="ident">end</span>,
<span class="ident">tail_len</span>: <span class="ident">len</span> <span class="op">-</span> <span class="ident">end</span>,
<span class="ident">iter</span>: <span class="ident">range_slice</span>.<span class="ident">iter</span>(),
<span class="ident">vec</span>: <span class="ident">Shared</span>::<span class="ident">new</span>(<span class="self">self</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> _),
}
}
}
<span class="doccomment">/// Clears the vector, removing all values.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that this method has no effect on the allocated capacity</span>
<span class="doccomment">/// of the vector.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut v = vec![1, 2, 3];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// v.clear();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(v.is_empty());</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">clear</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="self">self</span>.<span class="ident">truncate</span>(<span class="number">0</span>)
}
<span class="doccomment">/// Returns the number of elements in the vector, also referred to</span>
<span class="doccomment">/// as its 'length'.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let a = vec![1, 2, 3];</span>
<span class="doccomment">/// assert_eq!(a.len(), 3);</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">len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">len</span>
}
<span class="doccomment">/// Returns `true` if the vector contains no elements.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut v = Vec::new();</span>
<span class="doccomment">/// assert!(v.is_empty());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// v.push(1);</span>
<span class="doccomment">/// assert!(!v.is_empty());</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">pub</span> <span class="kw">fn</span> <span class="ident">is_empty</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">0</span>
}
<span class="doccomment">/// Splits the collection into two at the given index.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Returns a newly allocated `Self`. `self` contains elements `[0, at)`,</span>
<span class="doccomment">/// and the returned `Self` contains elements `[at, len)`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that the capacity of `self` does not change.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if `at > len`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut vec = vec![1,2,3];</span>
<span class="doccomment">/// let vec2 = vec.split_off(1);</span>
<span class="doccomment">/// assert_eq!(vec, [1]);</span>
<span class="doccomment">/// assert_eq!(vec2, [2, 3]);</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">"split_off"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.4.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">split_off</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">at</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="self">Self</span> {
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">at</span> <span class="op"><=</span> <span class="self">self</span>.<span class="ident">len</span>(), <span class="string">"`at` out of bounds"</span>);
<span class="kw">let</span> <span class="ident">other_len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span> <span class="op">-</span> <span class="ident">at</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">other</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="ident">other_len</span>);
<span class="comment">// Unsafely `set_len` and copy items to `other`.</span>
<span class="kw">unsafe</span> {
<span class="self">self</span>.<span class="ident">set_len</span>(<span class="ident">at</span>);
<span class="ident">other</span>.<span class="ident">set_len</span>(<span class="ident">other_len</span>);
<span class="ident">ptr</span>::<span class="ident">copy_nonoverlapping</span>(<span class="self">self</span>.<span class="ident">as_ptr</span>().<span class="ident">offset</span>(<span class="ident">at</span> <span class="kw">as</span> <span class="ident">isize</span>),
<span class="ident">other</span>.<span class="ident">as_mut_ptr</span>(),
<span class="ident">other</span>.<span class="ident">len</span>());
}
<span class="ident">other</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">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Resizes the `Vec` in-place so that `len` is equal to `new_len`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If `new_len` is greater than `len`, the `Vec` is extended by the</span>
<span class="doccomment">/// difference, with each additional slot filled with `value`.</span>
<span class="doccomment">/// If `new_len` is less than `len`, the `Vec` is simply truncated.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method requires `Clone` to clone the passed value. If you'd</span>
<span class="doccomment">/// rather create a value with `Default` instead, see [`resize_default`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut vec = vec!["hello"];</span>
<span class="doccomment">/// vec.resize(3, "world");</span>
<span class="doccomment">/// assert_eq!(vec, ["hello", "world", "world"]);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut vec = vec![1, 2, 3, 4];</span>
<span class="doccomment">/// vec.resize(2, 0);</span>
<span class="doccomment">/// assert_eq!(vec, [1, 2]);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`resize_default`]: #method.resize_default</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"vec_resize"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">resize</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">new_len</span>: <span class="ident">usize</span>, <span class="ident">value</span>: <span class="ident">T</span>) {
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>();
<span class="kw">if</span> <span class="ident">new_len</span> <span class="op">></span> <span class="ident">len</span> {
<span class="self">self</span>.<span class="ident">extend_with</span>(<span class="ident">new_len</span> <span class="op">-</span> <span class="ident">len</span>, <span class="ident">ExtendElement</span>(<span class="ident">value</span>))
} <span class="kw">else</span> {
<span class="self">self</span>.<span class="ident">truncate</span>(<span class="ident">new_len</span>);
}
}
<span class="doccomment">/// Clones and appends all elements in a slice to the `Vec`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Iterates over the slice `other`, clones each element, and then appends</span>
<span class="doccomment">/// it to this `Vec`. The `other` vector is traversed in-order.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that this function is same as `extend` except that it is</span>
<span class="doccomment">/// specialized to work with slices instead. If and when Rust gets</span>
<span class="doccomment">/// specialization this function will likely be deprecated (but still</span>
<span class="doccomment">/// available).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut vec = vec![1];</span>
<span class="doccomment">/// vec.extend_from_slice(&[2, 3, 4]);</span>
<span class="doccomment">/// assert_eq!(vec, [1, 2, 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">"vec_extend_from_slice"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">extend_from_slice</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) {
<span class="self">self</span>.<span class="ident">spec_extend</span>(<span class="ident">other</span>.<span class="ident">iter</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">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Resizes the `Vec` in-place so that `len` is equal to `new_len`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If `new_len` is greater than `len`, the `Vec` is extended by the</span>
<span class="doccomment">/// difference, with each additional slot filled with `Default::default()`.</span>
<span class="doccomment">/// If `new_len` is less than `len`, the `Vec` is simply truncated.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method uses `Default` to create new values on every push. If</span>
<span class="doccomment">/// you'd rather `Clone` a given value, use [`resize`].</span>
<span class="doccomment">///</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(vec_resize_default)]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut vec = vec![1, 2, 3];</span>
<span class="doccomment">/// vec.resize_default(5);</span>
<span class="doccomment">/// assert_eq!(vec, [1, 2, 3, 0, 0]);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut vec = vec![1, 2, 3, 4];</span>
<span class="doccomment">/// vec.resize_default(2);</span>
<span class="doccomment">/// assert_eq!(vec, [1, 2]);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`resize`]: #method.resize</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"vec_resize_default"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"41758"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">resize_default</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">new_len</span>: <span class="ident">usize</span>) {
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>();
<span class="kw">if</span> <span class="ident">new_len</span> <span class="op">></span> <span class="ident">len</span> {
<span class="self">self</span>.<span class="ident">extend_with</span>(<span class="ident">new_len</span> <span class="op">-</span> <span class="ident">len</span>, <span class="ident">ExtendDefault</span>);
} <span class="kw">else</span> {
<span class="self">self</span>.<span class="ident">truncate</span>(<span class="ident">new_len</span>);
}
}
}
<span class="comment">// This code generalises `extend_with_{element,default}`.</span>
<span class="kw">trait</span> <span class="ident">ExtendWith</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">T</span>;
<span class="kw">fn</span> <span class="ident">last</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">T</span>;
}
<span class="kw">struct</span> <span class="ident">ExtendElement</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">T</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">ExtendWith</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">ExtendElement</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">next</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="number">0</span>.<span class="ident">clone</span>() }
<span class="kw">fn</span> <span class="ident">last</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">T</span> { <span class="self">self</span>.<span class="number">0</span> }
}
<span class="kw">struct</span> <span class="ident">ExtendDefault</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">ExtendWith</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">ExtendDefault</span> {
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">T</span> { <span class="ident">Default</span>::<span class="ident">default</span>() }
<span class="kw">fn</span> <span class="ident">last</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">T</span> { <span class="ident">Default</span>::<span class="ident">default</span>() }
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Extend the vector by `n` values, using the given generator.</span>
<span class="kw">fn</span> <span class="ident">extend_with</span><span class="op"><</span><span class="ident">E</span>: <span class="ident">ExtendWith</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">n</span>: <span class="ident">usize</span>, <span class="ident">value</span>: <span class="ident">E</span>) {
<span class="self">self</span>.<span class="ident">reserve</span>(<span class="ident">n</span>);
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">as_mut_ptr</span>().<span class="ident">offset</span>(<span class="self">self</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">isize</span>);
<span class="comment">// Use SetLenOnDrop to work around bug where compiler</span>
<span class="comment">// may not realize the store through `ptr` through self.set_len()</span>
<span class="comment">// don't alias.</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">local_len</span> <span class="op">=</span> <span class="ident">SetLenOnDrop</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">len</span>);
<span class="comment">// Write all elements except the last one</span>
<span class="kw">for</span> _ <span class="kw">in</span> <span class="number">1</span>..<span class="ident">n</span> {
<span class="ident">ptr</span>::<span class="ident">write</span>(<span class="ident">ptr</span>, <span class="ident">value</span>.<span class="ident">next</span>());
<span class="ident">ptr</span> <span class="op">=</span> <span class="ident">ptr</span>.<span class="ident">offset</span>(<span class="number">1</span>);
<span class="comment">// Increment the length in every step in case next() panics</span>
<span class="ident">local_len</span>.<span class="ident">increment_len</span>(<span class="number">1</span>);
}
<span class="kw">if</span> <span class="ident">n</span> <span class="op">></span> <span class="number">0</span> {
<span class="comment">// We can write the last element directly without cloning needlessly</span>
<span class="ident">ptr</span>::<span class="ident">write</span>(<span class="ident">ptr</span>, <span class="ident">value</span>.<span class="ident">last</span>());
<span class="ident">local_len</span>.<span class="ident">increment_len</span>(<span class="number">1</span>);
}
<span class="comment">// len set by scope guard</span>
}
}
}
<span class="comment">// Set the length of the vec when the `SetLenOnDrop` value goes out of scope.</span>
<span class="comment">//</span>
<span class="comment">// The idea is: The length field in SetLenOnDrop is a local variable</span>
<span class="comment">// that the optimizer will see does not alias with any stores through the Vec's data</span>
<span class="comment">// pointer. This is a workaround for alias analysis issue #32155</span>
<span class="kw">struct</span> <span class="ident">SetLenOnDrop</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">len</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">usize</span>,
<span class="ident">local_len</span>: <span class="ident">usize</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">SetLenOnDrop</span><span class="op"><</span><span class="lifetime">'a</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">len</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">usize</span>) <span class="op">-></span> <span class="self">Self</span> {
<span class="ident">SetLenOnDrop</span> { <span class="ident">local_len</span>: <span class="kw-2">*</span><span class="ident">len</span>, <span class="ident">len</span>: <span class="ident">len</span> }
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">increment_len</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">increment</span>: <span class="ident">usize</span>) {
<span class="self">self</span>.<span class="ident">local_len</span> <span class="op">+=</span> <span class="ident">increment</span>;
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">SetLenOnDrop</span><span class="op"><</span><span class="lifetime">'a</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-2">*</span><span class="self">self</span>.<span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">local_len</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">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Removes consecutive repeated elements in the vector.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the vector is sorted, this removes all duplicates.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let mut vec = vec![1, 2, 2, 3, 2];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// vec.dedup();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(vec, [1, 2, 3, 2]);</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">dedup</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="self">self</span>.<span class="ident">dedup_by</span>(<span class="op">|</span><span class="ident">a</span>, <span class="ident">b</span><span class="op">|</span> <span class="ident">a</span> <span class="op">==</span> <span class="ident">b</span>)
}
<span class="doccomment">/// Removes the first instance of `item` from the vector if the item exists.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #![feature(vec_remove_item)]</span>
<span class="doccomment">/// let mut vec = vec![1, 2, 3, 1];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// vec.remove_item(&1);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(vec, vec![2, 3, 1]);</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">"vec_remove_item"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"recently added"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"40062"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">remove_item</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">item</span>: <span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">pos</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">iter</span>().<span class="ident">position</span>(<span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="kw-2">*</span><span class="ident">x</span> <span class="op">==</span> <span class="kw-2">*</span><span class="ident">item</span>) {
<span class="prelude-val">Some</span>(<span class="ident">x</span>) <span class="op">=></span> <span class="ident">x</span>,
<span class="prelude-val">None</span> <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">None</span>,
};
<span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">remove</span>(<span class="ident">pos</span>))
}
}
<span class="comment">////////////////////////////////////////////////////////////////////////////////</span>
<span class="comment">// Internal methods and functions</span>
<span class="comment">////////////////////////////////////////////////////////////////////////////////</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</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">from_elem</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Clone</span><span class="op">></span>(<span class="ident">elem</span>: <span class="ident">T</span>, <span class="ident">n</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="op"><</span><span class="ident">T</span> <span class="kw">as</span> <span class="ident">SpecFromElem</span><span class="op">></span>::<span class="ident">from_elem</span>(<span class="ident">elem</span>, <span class="ident">n</span>)
}
<span class="comment">// Specialization trait used for Vec::from_elem</span>
<span class="kw">trait</span> <span class="ident">SpecFromElem</span>: <span class="ident">Sized</span> {
<span class="kw">fn</span> <span class="ident">from_elem</span>(<span class="ident">elem</span>: <span class="self">Self</span>, <span class="ident">n</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="self">Self</span><span class="op">></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">SpecFromElem</span> <span class="kw">for</span> <span class="ident">T</span> {
<span class="ident">default</span> <span class="kw">fn</span> <span class="ident">from_elem</span>(<span class="ident">elem</span>: <span class="self">Self</span>, <span class="ident">n</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="ident">n</span>);
<span class="ident">v</span>.<span class="ident">extend_with</span>(<span class="ident">n</span>, <span class="ident">ExtendElement</span>(<span class="ident">elem</span>));
<span class="ident">v</span>
}
}
<span class="kw">impl</span> <span class="ident">SpecFromElem</span> <span class="kw">for</span> <span class="ident">u8</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">from_elem</span>(<span class="ident">elem</span>: <span class="ident">u8</span>, <span class="ident">n</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> {
<span class="kw">if</span> <span class="ident">elem</span> <span class="op">==</span> <span class="number">0</span> {
<span class="kw">return</span> <span class="ident">Vec</span> {
<span class="ident">buf</span>: <span class="ident">RawVec</span>::<span class="ident">with_capacity_zeroed</span>(<span class="ident">n</span>),
<span class="ident">len</span>: <span class="ident">n</span>,
}
}
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="ident">n</span>);
<span class="ident">ptr</span>::<span class="ident">write_bytes</span>(<span class="ident">v</span>.<span class="ident">as_mut_ptr</span>(), <span class="ident">elem</span>, <span class="ident">n</span>);
<span class="ident">v</span>.<span class="ident">set_len</span>(<span class="ident">n</span>);
<span class="ident">v</span>
}
}
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">impl_spec_from_elem</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>: <span class="ident">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">is_zero</span>: <span class="ident">expr</span>) <span class="op">=></span> {
<span class="kw">impl</span> <span class="ident">SpecFromElem</span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">from_elem</span>(<span class="ident">elem</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>, <span class="ident">n</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span><span class="op">></span> {
<span class="kw">if</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">is_zero</span>(<span class="ident">elem</span>) {
<span class="kw">return</span> <span class="ident">Vec</span> {
<span class="ident">buf</span>: <span class="ident">RawVec</span>::<span class="ident">with_capacity_zeroed</span>(<span class="ident">n</span>),
<span class="ident">len</span>: <span class="ident">n</span>,
}
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="ident">n</span>);
<span class="ident">v</span>.<span class="ident">extend_with</span>(<span class="ident">n</span>, <span class="ident">ExtendElement</span>(<span class="ident">elem</span>));
<span class="ident">v</span>
}
}
};
}
<span class="macro">impl_spec_from_elem</span><span class="macro">!</span>(<span class="ident">i8</span>, <span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span> <span class="op">==</span> <span class="number">0</span>);
<span class="macro">impl_spec_from_elem</span><span class="macro">!</span>(<span class="ident">i16</span>, <span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span> <span class="op">==</span> <span class="number">0</span>);
<span class="macro">impl_spec_from_elem</span><span class="macro">!</span>(<span class="ident">i32</span>, <span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span> <span class="op">==</span> <span class="number">0</span>);
<span class="macro">impl_spec_from_elem</span><span class="macro">!</span>(<span class="ident">i64</span>, <span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span> <span class="op">==</span> <span class="number">0</span>);
<span class="macro">impl_spec_from_elem</span><span class="macro">!</span>(<span class="ident">i128</span>, <span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span> <span class="op">==</span> <span class="number">0</span>);
<span class="macro">impl_spec_from_elem</span><span class="macro">!</span>(<span class="ident">isize</span>, <span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span> <span class="op">==</span> <span class="number">0</span>);
<span class="macro">impl_spec_from_elem</span><span class="macro">!</span>(<span class="ident">u16</span>, <span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span> <span class="op">==</span> <span class="number">0</span>);
<span class="macro">impl_spec_from_elem</span><span class="macro">!</span>(<span class="ident">u32</span>, <span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span> <span class="op">==</span> <span class="number">0</span>);
<span class="macro">impl_spec_from_elem</span><span class="macro">!</span>(<span class="ident">u64</span>, <span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span> <span class="op">==</span> <span class="number">0</span>);
<span class="macro">impl_spec_from_elem</span><span class="macro">!</span>(<span class="ident">u128</span>, <span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span> <span class="op">==</span> <span class="number">0</span>);
<span class="macro">impl_spec_from_elem</span><span class="macro">!</span>(<span class="ident">usize</span>, <span class="op">|</span><span class="ident">x</span><span class="op">|</span> <span class="ident">x</span> <span class="op">==</span> <span class="number">0</span>);
<span class="macro">impl_spec_from_elem</span><span class="macro">!</span>(<span class="ident">f32</span>, <span class="op">|</span><span class="ident">x</span>: <span class="ident">f32</span><span class="op">|</span> <span class="ident">x</span> <span class="op">==</span> <span class="number">0.</span> <span class="op">&&</span> <span class="ident">x</span>.<span class="ident">is_sign_positive</span>());
<span class="macro">impl_spec_from_elem</span><span class="macro">!</span>(<span class="ident">f64</span>, <span class="op">|</span><span class="ident">x</span>: <span class="ident">f64</span><span class="op">|</span> <span class="ident">x</span> <span class="op">==</span> <span class="number">0.</span> <span class="op">&&</span> <span class="ident">x</span>.<span class="ident">is_sign_positive</span>());
<span class="comment">////////////////////////////////////////////////////////////////////////////////</span>
<span class="comment">// Common trait implementations for Vec</span>
<span class="comment">////////////////////////////////////////////////////////////////////////////////</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">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">test</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">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span>::<span class="ident">to_vec</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>)
}
<span class="comment">// HACK(japaric): with cfg(test) the inherent `[T]::to_vec` method, which is</span>
<span class="comment">// required for this method definition, is not available. Instead use the</span>
<span class="comment">// `slice::to_vec` function which is only available with cfg(test)</span>
<span class="comment">// NB see the slice::hack module in slice.rs for more information</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</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">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
::<span class="ident">slice</span>::<span class="ident">to_vec</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>)
}
<span class="kw">fn</span> <span class="ident">clone_from</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) {
<span class="ident">other</span>.<span class="ident">as_slice</span>().<span class="ident">clone_into</span>(<span class="self">self</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">Hash</span><span class="op">></span> <span class="ident">Hash</span> <span class="kw">for</span> <span class="ident">Vec</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">hash</span><span class="op"><</span><span class="ident">H</span>: <span class="ident">hash</span>::<span class="ident">Hasher</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">state</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">H</span>) {
<span class="ident">Hash</span>::<span class="ident">hash</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>, <span class="ident">state</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="op">></span> <span class="ident">Index</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Output</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">index</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">index</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">T</span> {
<span class="comment">// NB built-in indexing via `&[T]`</span>
<span class="kw-2">&</span>(<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>)[<span class="ident">index</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="op">></span> <span class="ident">IndexMut</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Vec</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">index_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">index</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="comment">// NB built-in indexing via `&mut [T]`</span>
<span class="kw-2">&</span><span class="kw-2">mut</span> (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>)[<span class="ident">index</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="op">></span> <span class="ident">ops</span>::<span class="ident">Index</span><span class="op"><</span><span class="ident">ops</span>::<span class="ident">Range</span><span class="op"><</span><span class="ident">usize</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Output</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">index</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">index</span>: <span class="ident">ops</span>::<span class="ident">Range</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] {
<span class="ident">Index</span>::<span class="ident">index</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>, <span class="ident">index</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="op">></span> <span class="ident">ops</span>::<span class="ident">Index</span><span class="op"><</span><span class="ident">ops</span>::<span class="ident">RangeTo</span><span class="op"><</span><span class="ident">usize</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Output</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">index</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">index</span>: <span class="ident">ops</span>::<span class="ident">RangeTo</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] {
<span class="ident">Index</span>::<span class="ident">index</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>, <span class="ident">index</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="op">></span> <span class="ident">ops</span>::<span class="ident">Index</span><span class="op"><</span><span class="ident">ops</span>::<span class="ident">RangeFrom</span><span class="op"><</span><span class="ident">usize</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Output</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">index</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">index</span>: <span class="ident">ops</span>::<span class="ident">RangeFrom</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] {
<span class="ident">Index</span>::<span class="ident">index</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>, <span class="ident">index</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="op">></span> <span class="ident">ops</span>::<span class="ident">Index</span><span class="op"><</span><span class="ident">ops</span>::<span class="ident">RangeFull</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Output</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">index</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">_index</span>: <span class="ident">ops</span>::<span class="ident">RangeFull</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] {
<span class="self">self</span>
}
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"inclusive_range"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"recently added, follows RFC"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"28237"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">ops</span>::<span class="ident">Index</span><span class="op"><</span><span class="ident">ops</span>::<span class="ident">RangeInclusive</span><span class="op"><</span><span class="ident">usize</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Output</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">index</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">index</span>: <span class="ident">ops</span>::<span class="ident">RangeInclusive</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] {
<span class="ident">Index</span>::<span class="ident">index</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>, <span class="ident">index</span>)
}
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"inclusive_range"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"recently added, follows RFC"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"28237"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">ops</span>::<span class="ident">Index</span><span class="op"><</span><span class="ident">ops</span>::<span class="ident">RangeToInclusive</span><span class="op"><</span><span class="ident">usize</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Output</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">index</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">index</span>: <span class="ident">ops</span>::<span class="ident">RangeToInclusive</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">T</span>] {
<span class="ident">Index</span>::<span class="ident">index</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>, <span class="ident">index</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="op">></span> <span class="ident">ops</span>::<span class="ident">IndexMut</span><span class="op"><</span><span class="ident">ops</span>::<span class="ident">Range</span><span class="op"><</span><span class="ident">usize</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">Vec</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">index_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">index</span>: <span class="ident">ops</span>::<span class="ident">Range</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>] {
<span class="ident">IndexMut</span>::<span class="ident">index_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>, <span class="ident">index</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="op">></span> <span class="ident">ops</span>::<span class="ident">IndexMut</span><span class="op"><</span><span class="ident">ops</span>::<span class="ident">RangeTo</span><span class="op"><</span><span class="ident">usize</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">Vec</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">index_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">index</span>: <span class="ident">ops</span>::<span class="ident">RangeTo</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>] {
<span class="ident">IndexMut</span>::<span class="ident">index_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>, <span class="ident">index</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="op">></span> <span class="ident">ops</span>::<span class="ident">IndexMut</span><span class="op"><</span><span class="ident">ops</span>::<span class="ident">RangeFrom</span><span class="op"><</span><span class="ident">usize</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">Vec</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">index_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">index</span>: <span class="ident">ops</span>::<span class="ident">RangeFrom</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>] {
<span class="ident">IndexMut</span>::<span class="ident">index_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>, <span class="ident">index</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="op">></span> <span class="ident">ops</span>::<span class="ident">IndexMut</span><span class="op"><</span><span class="ident">ops</span>::<span class="ident">RangeFull</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Vec</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">index_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">_index</span>: <span class="ident">ops</span>::<span class="ident">RangeFull</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="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"inclusive_range"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"recently added, follows RFC"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"28237"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">ops</span>::<span class="ident">IndexMut</span><span class="op"><</span><span class="ident">ops</span>::<span class="ident">RangeInclusive</span><span class="op"><</span><span class="ident">usize</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">Vec</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">index_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">index</span>: <span class="ident">ops</span>::<span class="ident">RangeInclusive</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>] {
<span class="ident">IndexMut</span>::<span class="ident">index_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>, <span class="ident">index</span>)
}
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"inclusive_range"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"recently added, follows RFC"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"28237"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">ops</span>::<span class="ident">IndexMut</span><span class="op"><</span><span class="ident">ops</span>::<span class="ident">RangeToInclusive</span><span class="op"><</span><span class="ident">usize</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">Vec</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">index_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">index</span>: <span class="ident">ops</span>::<span class="ident">RangeToInclusive</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">T</span>] {
<span class="ident">IndexMut</span>::<span class="ident">index_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>, <span class="ident">index</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="op">></span> <span class="ident">ops</span>::<span class="ident">Deref</span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</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="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="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">p</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">ptr</span>();
<span class="ident">assume</span>(<span class="op">!</span><span class="ident">p</span>.<span class="ident">is_null</span>());
<span class="ident">slice</span>::<span class="ident">from_raw_parts</span>(<span class="ident">p</span>, <span class="self">self</span>.<span class="ident">len</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="op">></span> <span class="ident">ops</span>::<span class="ident">DerefMut</span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></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="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">ptr</span>();
<span class="ident">assume</span>(<span class="op">!</span><span class="ident">ptr</span>.<span class="ident">is_null</span>());
<span class="ident">slice</span>::<span class="ident">from_raw_parts_mut</span>(<span class="ident">ptr</span>, <span class="self">self</span>.<span class="ident">len</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="op">></span> <span class="ident">FromIterator</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Vec</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">from_iter</span><span class="op"><</span><span class="ident">I</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span><span class="op">>></span>(<span class="ident">iter</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="op"><</span><span class="self">Self</span> <span class="kw">as</span> <span class="ident">SpecExtend</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">I</span>::<span class="ident">IntoIter</span><span class="op">>></span>::<span class="ident">from_iter</span>(<span class="ident">iter</span>.<span class="ident">into_iter</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="op">></span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span>;
<span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>;
<span class="doccomment">/// Creates a consuming iterator, that is, one that moves each value out of</span>
<span class="doccomment">/// the vector (from start to end). The vector cannot be used after calling</span>
<span class="doccomment">/// this.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let v = vec!["a".to_string(), "b".to_string()];</span>
<span class="doccomment">/// for s in v.into_iter() {</span>
<span class="doccomment">/// // s has type String, not &String</span>
<span class="doccomment">/// println!("{}", s);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">begin</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">as_mut_ptr</span>();
<span class="ident">assume</span>(<span class="op">!</span><span class="ident">begin</span>.<span class="ident">is_null</span>());
<span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>() <span class="op">==</span> <span class="number">0</span> {
<span class="ident">arith_offset</span>(<span class="ident">begin</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">i8</span>, <span class="self">self</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">isize</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>
} <span class="kw">else</span> {
<span class="ident">begin</span>.<span class="ident">offset</span>(<span class="self">self</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">isize</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>
};
<span class="kw">let</span> <span class="ident">cap</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">cap</span>();
<span class="ident">mem</span>::<span class="ident">forget</span>(<span class="self">self</span>);
<span class="ident">IntoIter</span> {
<span class="ident">buf</span>: <span class="ident">Shared</span>::<span class="ident">new</span>(<span class="ident">begin</span>),
<span class="ident">cap</span>: <span class="ident">cap</span>,
<span class="ident">ptr</span>: <span class="ident">begin</span>,
<span class="ident">end</span>: <span class="ident">end</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="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span>;
<span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">slice</span>::<span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>;
<span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">slice</span>::<span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">iter</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="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">T</span>;
<span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">slice</span>::<span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>;
<span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">slice</span>::<span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">iter_mut</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="op">></span> <span class="ident">Extend</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Vec</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">extend</span><span class="op"><</span><span class="ident">I</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span><span class="op">>></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">iter</span>: <span class="ident">I</span>) {
<span class="op"><</span><span class="self">Self</span> <span class="kw">as</span> <span class="ident">SpecExtend</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">I</span>::<span class="ident">IntoIter</span><span class="op">>></span>::<span class="ident">spec_extend</span>(<span class="self">self</span>, <span class="ident">iter</span>.<span class="ident">into_iter</span>())
}
}
<span class="comment">// Specialization trait used for Vec::from_iter and Vec::extend</span>
<span class="kw">trait</span> <span class="ident">SpecExtend</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">I</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">from_iter</span>(<span class="ident">iter</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="self">Self</span>;
<span class="kw">fn</span> <span class="ident">spec_extend</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">iter</span>: <span class="ident">I</span>);
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">I</span><span class="op">></span> <span class="ident">SpecExtend</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">I</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">I</span>: <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span><span class="op">=</span><span class="ident">T</span><span class="op">></span>,
{
<span class="ident">default</span> <span class="kw">fn</span> <span class="ident">from_iter</span>(<span class="kw-2">mut</span> <span class="ident">iterator</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="self">Self</span> {
<span class="comment">// Unroll the first iteration, as the vector is going to be</span>
<span class="comment">// expanded on this iteration in every case when the iterable is not</span>
<span class="comment">// empty, but the loop in extend_desugared() is not going to see the</span>
<span class="comment">// vector being full in the few subsequent loop iterations.</span>
<span class="comment">// So we get better branch prediction.</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">vector</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">iterator</span>.<span class="ident">next</span>() {
<span class="prelude-val">None</span> <span class="op">=></span> <span class="kw">return</span> <span class="ident">Vec</span>::<span class="ident">new</span>(),
<span class="prelude-val">Some</span>(<span class="ident">element</span>) <span class="op">=></span> {
<span class="kw">let</span> (<span class="ident">lower</span>, _) <span class="op">=</span> <span class="ident">iterator</span>.<span class="ident">size_hint</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">vector</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="ident">lower</span>.<span class="ident">saturating_add</span>(<span class="number">1</span>));
<span class="kw">unsafe</span> {
<span class="ident">ptr</span>::<span class="ident">write</span>(<span class="ident">vector</span>.<span class="ident">get_unchecked_mut</span>(<span class="number">0</span>), <span class="ident">element</span>);
<span class="ident">vector</span>.<span class="ident">set_len</span>(<span class="number">1</span>);
}
<span class="ident">vector</span>
}
};
<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">as</span> <span class="ident">SpecExtend</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">I</span><span class="op">>></span>::<span class="ident">spec_extend</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">vector</span>, <span class="ident">iterator</span>);
<span class="ident">vector</span>
}
<span class="ident">default</span> <span class="kw">fn</span> <span class="ident">spec_extend</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">iter</span>: <span class="ident">I</span>) {
<span class="self">self</span>.<span class="ident">extend_desugared</span>(<span class="ident">iter</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">I</span><span class="op">></span> <span class="ident">SpecExtend</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">I</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">I</span>: <span class="ident">TrustedLen</span><span class="op"><</span><span class="ident">Item</span><span class="op">=</span><span class="ident">T</span><span class="op">></span>,
{
<span class="ident">default</span> <span class="kw">fn</span> <span class="ident">from_iter</span>(<span class="ident">iterator</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="self">Self</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">vector</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
<span class="ident">vector</span>.<span class="ident">spec_extend</span>(<span class="ident">iterator</span>);
<span class="ident">vector</span>
}
<span class="ident">default</span> <span class="kw">fn</span> <span class="ident">spec_extend</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">iterator</span>: <span class="ident">I</span>) {
<span class="comment">// This is the case for a TrustedLen iterator.</span>
<span class="kw">let</span> (<span class="ident">low</span>, <span class="ident">high</span>) <span class="op">=</span> <span class="ident">iterator</span>.<span class="ident">size_hint</span>();
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">high_value</span>) <span class="op">=</span> <span class="ident">high</span> {
<span class="macro">debug_assert_eq</span><span class="macro">!</span>(<span class="ident">low</span>, <span class="ident">high_value</span>,
<span class="string">"TrustedLen iterator's size hint is not exact: {:?}"</span>,
(<span class="ident">low</span>, <span class="ident">high</span>));
}
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">additional</span>) <span class="op">=</span> <span class="ident">high</span> {
<span class="self">self</span>.<span class="ident">reserve</span>(<span class="ident">additional</span>);
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">as_mut_ptr</span>().<span class="ident">offset</span>(<span class="self">self</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">isize</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">local_len</span> <span class="op">=</span> <span class="ident">SetLenOnDrop</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">len</span>);
<span class="kw">for</span> <span class="ident">element</span> <span class="kw">in</span> <span class="ident">iterator</span> {
<span class="ident">ptr</span>::<span class="ident">write</span>(<span class="ident">ptr</span>, <span class="ident">element</span>);
<span class="ident">ptr</span> <span class="op">=</span> <span class="ident">ptr</span>.<span class="ident">offset</span>(<span class="number">1</span>);
<span class="comment">// NB can't overflow since we would have had to alloc the address space</span>
<span class="ident">local_len</span>.<span class="ident">increment_len</span>(<span class="number">1</span>);
}
}
} <span class="kw">else</span> {
<span class="self">self</span>.<span class="ident">extend_desugared</span>(<span class="ident">iterator</span>)
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">SpecExtend</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">from_iter</span>(<span class="ident">iterator</span>: <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="self">Self</span> {
<span class="comment">// A common case is passing a vector into a function which immediately</span>
<span class="comment">// re-collects into a vector. We can short circuit this if the IntoIter</span>
<span class="comment">// has not been advanced at all.</span>
<span class="kw">if</span> <span class="ident">iterator</span>.<span class="ident">buf</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> _ <span class="op">==</span> <span class="ident">iterator</span>.<span class="ident">ptr</span> {
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">vec</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">from_raw_parts</span>(<span class="ident">iterator</span>.<span class="ident">buf</span>.<span class="ident">as_ptr</span>(),
<span class="ident">iterator</span>.<span class="ident">len</span>(),
<span class="ident">iterator</span>.<span class="ident">cap</span>);
<span class="ident">mem</span>::<span class="ident">forget</span>(<span class="ident">iterator</span>);
<span class="ident">vec</span>
}
} <span class="kw">else</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">vector</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
<span class="ident">vector</span>.<span class="ident">spec_extend</span>(<span class="ident">iterator</span>);
<span class="ident">vector</span>
}
}
<span class="kw">fn</span> <span class="ident">spec_extend</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">iterator</span>: <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) {
<span class="kw">unsafe</span> {
<span class="self">self</span>.<span class="ident">append_elements</span>(<span class="ident">iterator</span>.<span class="ident">as_slice</span>() <span class="kw">as</span> _);
}
<span class="ident">iterator</span>.<span class="ident">ptr</span> <span class="op">=</span> <span class="ident">iterator</span>.<span class="ident">end</span>;
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span>, <span class="ident">I</span><span class="op">></span> <span class="ident">SpecExtend</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span>, <span class="ident">I</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">I</span>: <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span><span class="op">=</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span><span class="op">></span>,
<span class="ident">T</span>: <span class="ident">Clone</span>,
{
<span class="ident">default</span> <span class="kw">fn</span> <span class="ident">from_iter</span>(<span class="ident">iterator</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="self">Self</span> {
<span class="ident">SpecExtend</span>::<span class="ident">from_iter</span>(<span class="ident">iterator</span>.<span class="ident">cloned</span>())
}
<span class="ident">default</span> <span class="kw">fn</span> <span class="ident">spec_extend</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">iterator</span>: <span class="ident">I</span>) {
<span class="self">self</span>.<span class="ident">spec_extend</span>(<span class="ident">iterator</span>.<span class="ident">cloned</span>())
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> <span class="ident">SpecExtend</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span>, <span class="ident">slice</span>::<span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">Vec</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">Copy</span>,
{
<span class="kw">fn</span> <span class="ident">spec_extend</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">iterator</span>: <span class="ident">slice</span>::<span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>) {
<span class="kw">let</span> <span class="ident">slice</span> <span class="op">=</span> <span class="ident">iterator</span>.<span class="ident">as_slice</span>();
<span class="self">self</span>.<span class="ident">reserve</span>(<span class="ident">slice</span>.<span class="ident">len</span>());
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>();
<span class="self">self</span>.<span class="ident">set_len</span>(<span class="ident">len</span> <span class="op">+</span> <span class="ident">slice</span>.<span class="ident">len</span>());
<span class="self">self</span>.<span class="ident">get_unchecked_mut</span>(<span class="ident">len</span>..).<span class="ident">copy_from_slice</span>(<span class="ident">slice</span>);
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">extend_desugared</span><span class="op"><</span><span class="ident">I</span>: <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span><span class="op">>></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">iterator</span>: <span class="ident">I</span>) {
<span class="comment">// This is the case for a general iterator.</span>
<span class="comment">//</span>
<span class="comment">// This function should be the moral equivalent of:</span>
<span class="comment">//</span>
<span class="comment">// for item in iterator {</span>
<span class="comment">// self.push(item);</span>
<span class="comment">// }</span>
<span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">element</span>) <span class="op">=</span> <span class="ident">iterator</span>.<span class="ident">next</span>() {
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>();
<span class="kw">if</span> <span class="ident">len</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">capacity</span>() {
<span class="kw">let</span> (<span class="ident">lower</span>, _) <span class="op">=</span> <span class="ident">iterator</span>.<span class="ident">size_hint</span>();
<span class="self">self</span>.<span class="ident">reserve</span>(<span class="ident">lower</span>.<span class="ident">saturating_add</span>(<span class="number">1</span>));
}
<span class="kw">unsafe</span> {
<span class="ident">ptr</span>::<span class="ident">write</span>(<span class="self">self</span>.<span class="ident">get_unchecked_mut</span>(<span class="ident">len</span>), <span class="ident">element</span>);
<span class="comment">// NB can't overflow since we would have had to alloc the address space</span>
<span class="self">self</span>.<span class="ident">set_len</span>(<span class="ident">len</span> <span class="op">+</span> <span class="number">1</span>);
}
}
}
<span class="doccomment">/// Creates a splicing iterator that replaces the specified range in the vector</span>
<span class="doccomment">/// with the given `replace_with` iterator and yields the removed items.</span>
<span class="doccomment">/// `replace_with` does not need to be the same length as `range`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note 1: The element range is removed even if the iterator is not</span>
<span class="doccomment">/// consumed until the end.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note 2: It is unspecified how many elements are removed from the vector,</span>
<span class="doccomment">/// if the `Splice` value is leaked.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note 3: The input iterator `replace_with` is only consumed</span>
<span class="doccomment">/// when the `Splice` value is dropped.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note 4: This is optimal if:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * The tail (elements in the vector after `range`) is empty,</span>
<span class="doccomment">/// * or `replace_with` yields fewer elements than `range`’s length</span>
<span class="doccomment">/// * or the lower bound of its `size_hint()` is exact.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Otherwise, a temporary vector is allocated and the tail is moved twice.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the starting point is greater than the end point or if</span>
<span class="doccomment">/// the end point is greater than the length of the vector.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(splice)]</span>
<span class="doccomment">/// let mut v = vec![1, 2, 3];</span>
<span class="doccomment">/// let new = [7, 8];</span>
<span class="doccomment">/// let u: Vec<_> = v.splice(..2, new.iter().cloned()).collect();</span>
<span class="doccomment">/// assert_eq!(v, &[7, 8, 3]);</span>
<span class="doccomment">/// assert_eq!(u, &[1, 2]);</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">"splice"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"recently added"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32310"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">splice</span><span class="op"><</span><span class="ident">R</span>, <span class="ident">I</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">range</span>: <span class="ident">R</span>, <span class="ident">replace_with</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="ident">Splice</span><span class="op"><</span><span class="ident">I</span>::<span class="ident">IntoIter</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">R</span>: <span class="ident">RangeArgument</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>, <span class="ident">I</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span><span class="op">=</span><span class="ident">T</span><span class="op">></span>
{
<span class="ident">Splice</span> {
<span class="ident">drain</span>: <span class="self">self</span>.<span class="ident">drain</span>(<span class="ident">range</span>),
<span class="ident">replace_with</span>: <span class="ident">replace_with</span>.<span class="ident">into_iter</span>(),
}
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extend_ref"</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="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">Copy</span><span class="op">></span> <span class="ident">Extend</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">extend</span><span class="op"><</span><span class="ident">I</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span><span class="op">>></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">iter</span>: <span class="ident">I</span>) {
<span class="self">self</span>.<span class="ident">spec_extend</span>(<span class="ident">iter</span>.<span class="ident">into_iter</span>())
}
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">__impl_slice_eq1</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">Lhs</span>: <span class="ident">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Rhs</span>: <span class="ident">ty</span>) <span class="op">=></span> {
<span class="macro">__impl_slice_eq1</span><span class="macro">!</span> { <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Lhs</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Rhs</span>, <span class="ident">Sized</span> }
};
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">Lhs</span>: <span class="ident">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Rhs</span>: <span class="ident">ty</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Bound</span>: <span class="ident">ident</span>) <span class="op">=></span> {
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="lifetime">'b</span>, <span class="ident">A</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Bound</span>, <span class="ident">B</span><span class="op">></span> <span class="ident">PartialEq</span><span class="op"><</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">Rhs</span><span class="op">></span> <span class="kw">for</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">Lhs</span> <span class="kw">where</span> <span class="ident">A</span>: <span class="ident">PartialEq</span><span class="op"><</span><span class="ident">B</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="macro-nonterminal">$</span><span class="macro-nonterminal">Rhs</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>[..] <span class="op">==</span> <span class="ident">other</span>[..] }
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">ne</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">Rhs</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>[..] <span class="op">!=</span> <span class="ident">other</span>[..] }
}
}
}
<span class="macro">__impl_slice_eq1</span><span class="macro">!</span> { <span class="ident">Vec</span><span class="op"><</span><span class="ident">A</span><span class="op">></span>, <span class="ident">Vec</span><span class="op"><</span><span class="ident">B</span><span class="op">></span> }
<span class="macro">__impl_slice_eq1</span><span class="macro">!</span> { <span class="ident">Vec</span><span class="op"><</span><span class="ident">A</span><span class="op">></span>, <span class="kw-2">&</span><span class="lifetime">'b</span> [<span class="ident">B</span>] }
<span class="macro">__impl_slice_eq1</span><span class="macro">!</span> { <span class="ident">Vec</span><span class="op"><</span><span class="ident">A</span><span class="op">></span>, <span class="kw-2">&</span><span class="lifetime">'b</span> <span class="kw-2">mut</span> [<span class="ident">B</span>] }
<span class="macro">__impl_slice_eq1</span><span class="macro">!</span> { <span class="ident">Cow</span><span class="op"><</span><span class="lifetime">'a</span>, [<span class="ident">A</span>]<span class="op">></span>, <span class="kw-2">&</span><span class="lifetime">'b</span> [<span class="ident">B</span>], <span class="ident">Clone</span> }
<span class="macro">__impl_slice_eq1</span><span class="macro">!</span> { <span class="ident">Cow</span><span class="op"><</span><span class="lifetime">'a</span>, [<span class="ident">A</span>]<span class="op">></span>, <span class="kw-2">&</span><span class="lifetime">'b</span> <span class="kw-2">mut</span> [<span class="ident">B</span>], <span class="ident">Clone</span> }
<span class="macro">__impl_slice_eq1</span><span class="macro">!</span> { <span class="ident">Cow</span><span class="op"><</span><span class="lifetime">'a</span>, [<span class="ident">A</span>]<span class="op">></span>, <span class="ident">Vec</span><span class="op"><</span><span class="ident">B</span><span class="op">></span>, <span class="ident">Clone</span> }
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">array_impls</span> {
($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>: <span class="ident">expr</span>)<span class="op">+</span>) <span class="op">=></span> {
$(
<span class="comment">// NOTE: some less important impls are omitted to reduce code bloat</span>
<span class="macro">__impl_slice_eq1</span><span class="macro">!</span> { <span class="ident">Vec</span><span class="op"><</span><span class="ident">A</span><span class="op">></span>, [<span class="ident">B</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>] }
<span class="macro">__impl_slice_eq1</span><span class="macro">!</span> { <span class="ident">Vec</span><span class="op"><</span><span class="ident">A</span><span class="op">></span>, <span class="kw-2">&</span><span class="lifetime">'b</span> [<span class="ident">B</span>; <span class="macro-nonterminal">$</span><span class="macro-nonterminal">N</span>] }
<span class="comment">// __impl_slice_eq1! { Vec<A>, &'b mut [B; $N] }</span>
<span class="comment">// __impl_slice_eq1! { Cow<'a, [A]>, [B; $N], Clone }</span>
<span class="comment">// __impl_slice_eq1! { Cow<'a, [A]>, &'b [B; $N], Clone }</span>
<span class="comment">// __impl_slice_eq1! { Cow<'a, [A]>, &'b mut [B; $N], Clone }</span>
)<span class="op">+</span>
}
}
<span class="macro">array_impls</span><span class="macro">!</span> {
<span class="number">0</span> <span class="number">1</span> <span class="number">2</span> <span class="number">3</span> <span class="number">4</span> <span class="number">5</span> <span class="number">6</span> <span class="number">7</span> <span class="number">8</span> <span class="number">9</span>
<span class="number">10</span> <span class="number">11</span> <span class="number">12</span> <span class="number">13</span> <span class="number">14</span> <span class="number">15</span> <span class="number">16</span> <span class="number">17</span> <span class="number">18</span> <span class="number">19</span>
<span class="number">20</span> <span class="number">21</span> <span class="number">22</span> <span class="number">23</span> <span class="number">24</span> <span class="number">25</span> <span class="number">26</span> <span class="number">27</span> <span class="number">28</span> <span class="number">29</span>
<span class="number">30</span> <span class="number">31</span> <span class="number">32</span>
}
<span class="doccomment">/// Implements comparison of vectors, lexicographically.</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">PartialOrd</span><span class="op">></span> <span class="ident">PartialOrd</span> <span class="kw">for</span> <span class="ident">Vec</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">Vec</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="ident">PartialOrd</span>::<span class="ident">partial_cmp</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">other</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">Eq</span><span class="op">></span> <span class="ident">Eq</span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
<span class="doccomment">/// Implements ordering of vectors, lexicographically.</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">Ord</span><span class="op">></span> <span class="ident">Ord</span> <span class="kw">for</span> <span class="ident">Vec</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">Vec</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="ident">Ord</span>::<span class="ident">cmp</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>, <span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">other</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="attribute">#[<span class="ident">may_dangle</span>]</span> <span class="ident">T</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></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">unsafe</span> {
<span class="comment">// use drop for [T]</span>
<span class="ident">ptr</span>::<span class="ident">drop_in_place</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>[..]);
}
<span class="comment">// RawVec handles deallocation</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="op">></span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Creates an empty `Vec<T>`.</span>
<span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">Vec</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">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">fmt</span>::<span class="ident">Debug</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</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="ident">fmt</span>::<span class="ident">Debug</span>::<span class="ident">fmt</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>, <span class="ident">f</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="op">></span> <span class="ident">AsRef</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">as_ref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="self">self</span>
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"vec_as_mut"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">AsMut</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">as_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">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="self">self</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="op">></span> <span class="ident">AsRef</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">as_ref</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="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"vec_as_mut"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">AsMut</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">as_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="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="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Clone</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">test</span>))]</span>
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">s</span>.<span class="ident">to_vec</span>()
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
::<span class="ident">slice</span>::<span class="ident">to_vec</span>(<span class="ident">s</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"vec_from_mut"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.19.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Clone</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">test</span>))]</span>
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">s</span>.<span class="ident">to_vec</span>()
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
::<span class="ident">slice</span>::<span class="ident">to_vec</span>(<span class="ident">s</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"vec_from_cow_slice"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.14.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">Cow</span><span class="op"><</span><span class="lifetime">'a</span>, [<span class="ident">T</span>]<span class="op">>></span> <span class="kw">for</span> <span class="ident">Vec</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">ToOwned</span><span class="op"><</span><span class="ident">Owned</span><span class="op">=</span><span class="ident">Vec</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">s</span>: <span class="ident">Cow</span><span class="op"><</span><span class="lifetime">'a</span>, [<span class="ident">T</span>]<span class="op">></span>) <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">s</span>.<span class="ident">into_owned</span>()
}
}
<span class="comment">// note: test pulls in libstd, which causes errors here</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">test</span>))]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"vec_from_box"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.18.0"</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">Box</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">>></span> <span class="kw">for</span> <span class="ident">Vec</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">s</span>: <span class="ident">Box</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span>) <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">s</span>.<span class="ident">into_vec</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"box_from_vec"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.18.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Into</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">>></span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">into</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">Box</span><span class="op"><</span>[<span class="ident">T</span>]<span class="op">></span> {
<span class="self">self</span>.<span class="ident">into_boxed_slice</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="lifetime">'a</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span>) <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> {
<span class="ident">From</span>::<span class="ident">from</span>(<span class="ident">s</span>.<span class="ident">as_bytes</span>())
}
}
<span class="comment">////////////////////////////////////////////////////////////////////////////////</span>
<span class="comment">// Clone-on-write</span>
<span class="comment">////////////////////////////////////////////////////////////////////////////////</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"cow_from_vec"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.8.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Clone</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">Cow</span><span class="op"><</span><span class="lifetime">'a</span>, [<span class="ident">T</span>]<span class="op">></span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> [<span class="ident">T</span>]) <span class="op">-></span> <span class="ident">Cow</span><span class="op"><</span><span class="lifetime">'a</span>, [<span class="ident">T</span>]<span class="op">></span> {
<span class="ident">Cow</span>::<span class="ident">Borrowed</span>(<span class="ident">s</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"cow_from_vec"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.8.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Clone</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">Cow</span><span class="op"><</span><span class="lifetime">'a</span>, [<span class="ident">T</span>]<span class="op">></span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">Cow</span><span class="op"><</span><span class="lifetime">'a</span>, [<span class="ident">T</span>]<span class="op">></span> {
<span class="ident">Cow</span>::<span class="ident">Owned</span>(<span class="ident">v</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="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">FromIterator</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Cow</span><span class="op"><</span><span class="lifetime">'a</span>, [<span class="ident">T</span>]<span class="op">></span> <span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Clone</span> {
<span class="kw">fn</span> <span class="ident">from_iter</span><span class="op"><</span><span class="ident">I</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span><span class="op">>></span>(<span class="ident">it</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="ident">Cow</span><span class="op"><</span><span class="lifetime">'a</span>, [<span class="ident">T</span>]<span class="op">></span> {
<span class="ident">Cow</span>::<span class="ident">Owned</span>(<span class="ident">FromIterator</span>::<span class="ident">from_iter</span>(<span class="ident">it</span>))
}
}
<span class="comment">////////////////////////////////////////////////////////////////////////////////</span>
<span class="comment">// Iterators</span>
<span class="comment">////////////////////////////////////////////////////////////////////////////////</span>
<span class="doccomment">/// An iterator that moves out of a vector.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This `struct` is created by the `into_iter` method on [`Vec`][`Vec`] (provided</span>
<span class="doccomment">/// by the [`IntoIterator`] trait).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Vec`]: struct.Vec.html</span>
<span class="doccomment">/// [`IntoIterator`]: ../../std/iter/trait.IntoIterator.html</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">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">buf</span>: <span class="ident">Shared</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
<span class="ident">cap</span>: <span class="ident">usize</span>,
<span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">T</span>,
<span class="ident">end</span>: <span class="kw-2">*</span><span class="kw">const</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">"vec_intoiter_debug"</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="op"><</span><span class="ident">T</span>: <span class="ident">fmt</span>::<span class="ident">Debug</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</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="ident">f</span>.<span class="ident">debug_tuple</span>(<span class="string">"IntoIter"</span>)
.<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">as_slice</span>())
.<span class="ident">finish</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Returns the remaining items of this iterator as a slice.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let vec = vec!['a', 'b', 'c'];</span>
<span class="doccomment">/// let mut into_iter = vec.into_iter();</span>
<span class="doccomment">/// assert_eq!(into_iter.as_slice(), &['a', 'b', 'c']);</span>
<span class="doccomment">/// let _ = into_iter.next().unwrap();</span>
<span class="doccomment">/// assert_eq!(into_iter.as_slice(), &['b', 'c']);</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">"vec_into_iter_as_slice"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.15.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_slice</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="kw">unsafe</span> {
<span class="ident">slice</span>::<span class="ident">from_raw_parts</span>(<span class="self">self</span>.<span class="ident">ptr</span>, <span class="self">self</span>.<span class="ident">len</span>())
}
}
<span class="doccomment">/// Returns the remaining items of this iterator as a mutable slice.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// let vec = vec!['a', 'b', 'c'];</span>
<span class="doccomment">/// let mut into_iter = vec.into_iter();</span>
<span class="doccomment">/// assert_eq!(into_iter.as_slice(), &['a', 'b', 'c']);</span>
<span class="doccomment">/// into_iter.as_mut_slice()[2] = 'z';</span>
<span class="doccomment">/// assert_eq!(into_iter.next().unwrap(), 'a');</span>
<span class="doccomment">/// assert_eq!(into_iter.next().unwrap(), 'b');</span>
<span class="doccomment">/// assert_eq!(into_iter.next().unwrap(), 'z');</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">"vec_into_iter_as_slice"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.15.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_mut_slice</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="ident">slice</span>::<span class="ident">from_raw_parts_mut</span>(<span class="self">self</span>.<span class="ident">ptr</span> <span class="kw">as</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">len</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="ident">Send</span><span class="op">></span> <span class="ident">Send</span> <span class="kw">for</span> <span class="ident">IntoIter</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">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Sync</span><span class="op">></span> <span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">IntoIter</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="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</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">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">unsafe</span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">ptr</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> _ <span class="op">==</span> <span class="self">self</span>.<span class="ident">end</span> {
<span class="prelude-val">None</span>
} <span class="kw">else</span> {
<span class="kw">if</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>() <span class="op">==</span> <span class="number">0</span> {
<span class="comment">// purposefully don't use 'ptr.offset' because for</span>
<span class="comment">// vectors with 0-size elements this would return the</span>
<span class="comment">// same pointer.</span>
<span class="self">self</span>.<span class="ident">ptr</span> <span class="op">=</span> <span class="ident">arith_offset</span>(<span class="self">self</span>.<span class="ident">ptr</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">i8</span>, <span class="number">1</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>;
<span class="comment">// Use a non-null pointer value</span>
<span class="comment">// (self.ptr might be null because of wrapping)</span>
<span class="prelude-val">Some</span>(<span class="ident">ptr</span>::<span class="ident">read</span>(<span class="number">1</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">else</span> {
<span class="kw">let</span> <span class="ident">old</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">ptr</span>;
<span class="self">self</span>.<span class="ident">ptr</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">ptr</span>.<span class="ident">offset</span>(<span class="number">1</span>);
<span class="prelude-val">Some</span>(<span class="ident">ptr</span>::<span class="ident">read</span>(<span class="ident">old</span>))
}
}
}
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) {
<span class="kw">let</span> <span class="ident">exact</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">ptr</span>.<span class="ident">offset_to</span>(<span class="self">self</span>.<span class="ident">end</span>) {
<span class="prelude-val">Some</span>(<span class="ident">x</span>) <span class="op">=></span> <span class="ident">x</span> <span class="kw">as</span> <span class="ident">usize</span>,
<span class="prelude-val">None</span> <span class="op">=></span> (<span class="self">self</span>.<span class="ident">end</span> <span class="kw">as</span> <span class="ident">usize</span>).<span class="ident">wrapping_sub</span>(<span class="self">self</span>.<span class="ident">ptr</span> <span class="kw">as</span> <span class="ident">usize</span>),
};
(<span class="ident">exact</span>, <span class="prelude-val">Some</span>(<span class="ident">exact</span>))
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">count</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">len</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="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">IntoIter</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">next_back</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">unsafe</span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">end</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">ptr</span> {
<span class="prelude-val">None</span>
} <span class="kw">else</span> {
<span class="kw">if</span> <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>() <span class="op">==</span> <span class="number">0</span> {
<span class="comment">// See above for why 'ptr.offset' isn't used</span>
<span class="self">self</span>.<span class="ident">end</span> <span class="op">=</span> <span class="ident">arith_offset</span>(<span class="self">self</span>.<span class="ident">end</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">i8</span>, <span class="op">-</span><span class="number">1</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">T</span>;
<span class="comment">// Use a non-null pointer value</span>
<span class="comment">// (self.end might be null because of wrapping)</span>
<span class="prelude-val">Some</span>(<span class="ident">ptr</span>::<span class="ident">read</span>(<span class="number">1</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">else</span> {
<span class="self">self</span>.<span class="ident">end</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">end</span>.<span class="ident">offset</span>(<span class="op">-</span><span class="number">1</span>);
<span class="prelude-val">Some</span>(<span class="ident">ptr</span>::<span class="ident">read</span>(<span class="self">self</span>.<span class="ident">end</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="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">is_empty</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">ptr</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">end</span>
}
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"35602"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"trusted_len"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"37572"</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">TrustedLen</span> <span class="kw">for</span> <span class="ident">IntoIter</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">"vec_into_iter_clone"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.8.0"</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">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></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">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">as_slice</span>().<span class="ident">to_owned</span>().<span class="ident">into_iter</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="attribute">#[<span class="ident">may_dangle</span>]</span> <span class="ident">T</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></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="comment">// destroy the remaining elements</span>
<span class="kw">for</span> <span class="ident">_x</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">by_ref</span>() {}
<span class="comment">// RawVec handles deallocation</span>
<span class="kw">let</span> _ <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">RawVec</span>::<span class="ident">from_raw_parts</span>(<span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">as_ptr</span>(), <span class="self">self</span>.<span class="ident">cap</span>) };
}
}
<span class="doccomment">/// A draining iterator for `Vec<T>`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This `struct` is created by the [`drain`] method on [`Vec`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`drain`]: struct.Vec.html#method.drain</span>
<span class="doccomment">/// [`Vec`]: struct.Vec.html</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"drain"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> {
<span class="doccomment">/// Index of tail to preserve</span>
<span class="ident">tail_start</span>: <span class="ident">usize</span>,
<span class="doccomment">/// Length of tail</span>
<span class="ident">tail_len</span>: <span class="ident">usize</span>,
<span class="doccomment">/// Current remaining range to remove</span>
<span class="ident">iter</span>: <span class="ident">slice</span>::<span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>,
<span class="ident">vec</span>: <span class="ident">Shared</span><span class="op"><</span><span class="ident">Vec</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">"collection_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</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="ident">f</span>.<span class="ident">debug_tuple</span>(<span class="string">"Drain"</span>)
.<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">as_slice</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">"drain"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Sync</span><span class="op">></span> <span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</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">"drain"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Send</span><span class="op">></span> <span class="ident">Send</span> <span class="kw">for</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</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">"drain"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</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">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">next</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">elt</span><span class="op">|</span> <span class="kw">unsafe</span> { <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="ident">elt</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> _) })
}
<span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) {
<span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">size_hint</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"drain"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</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">next_back</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">next_back</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">elt</span><span class="op">|</span> <span class="kw">unsafe</span> { <span class="ident">ptr</span>::<span class="ident">read</span>(<span class="ident">elt</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> _) })
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"drain"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></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="comment">// exhaust self first</span>
<span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(_) <span class="op">=</span> <span class="self">self</span>.<span class="ident">next</span>() {}
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">tail_len</span> <span class="op">></span> <span class="number">0</span> {
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">source_vec</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">vec</span>.<span class="ident">as_mut</span>();
<span class="comment">// memmove back untouched tail, update to new length</span>
<span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="ident">source_vec</span>.<span class="ident">len</span>();
<span class="kw">let</span> <span class="ident">tail</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">tail_start</span>;
<span class="kw">let</span> <span class="ident">src</span> <span class="op">=</span> <span class="ident">source_vec</span>.<span class="ident">as_ptr</span>().<span class="ident">offset</span>(<span class="ident">tail</span> <span class="kw">as</span> <span class="ident">isize</span>);
<span class="kw">let</span> <span class="ident">dst</span> <span class="op">=</span> <span class="ident">source_vec</span>.<span class="ident">as_mut_ptr</span>().<span class="ident">offset</span>(<span class="ident">start</span> <span class="kw">as</span> <span class="ident">isize</span>);
<span class="ident">ptr</span>::<span class="ident">copy</span>(<span class="ident">src</span>, <span class="ident">dst</span>, <span class="self">self</span>.<span class="ident">tail_len</span>);
<span class="ident">source_vec</span>.<span class="ident">set_len</span>(<span class="ident">start</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">tail_len</span>);
}
}
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"drain"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">is_empty</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">is_empty</span>()
}
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"35602"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {}
<span class="doccomment">/// A place for insertion at the back of a `Vec`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See [`Vec::place_back`](struct.Vec.html#method.place_back) for details.</span>
<span class="attribute">#[<span class="ident">must_use</span> <span class="op">=</span> <span class="string">"places do nothing unless written to with `<-` syntax"</span>]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"collection_placement"</span>,
<span class="ident">reason</span> <span class="op">=</span> <span class="string">"struct name and placement protocol are subject to change"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"30172"</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">PlaceBack</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">vec</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"collection_placement"</span>,
<span class="ident">reason</span> <span class="op">=</span> <span class="string">"placement protocol is subject to change"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"30172"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Placer</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">PlaceBack</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Place</span> <span class="op">=</span> <span class="ident">PlaceBack</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>;
<span class="kw">fn</span> <span class="ident">make_place</span>(<span class="self">self</span>) <span class="op">-></span> <span class="self">Self</span> {
<span class="comment">// This will panic or abort if we would allocate > isize::MAX bytes</span>
<span class="comment">// or if the length increment would overflow for zero-sized types.</span>
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">vec</span>.<span class="ident">len</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">vec</span>.<span class="ident">buf</span>.<span class="ident">cap</span>() {
<span class="self">self</span>.<span class="ident">vec</span>.<span class="ident">buf</span>.<span class="ident">double</span>();
}
<span class="self">self</span>
}
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"collection_placement"</span>,
<span class="ident">reason</span> <span class="op">=</span> <span class="string">"placement protocol is subject to change"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"30172"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Place</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">PlaceBack</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">pointer</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="self">self</span>.<span class="ident">vec</span>.<span class="ident">as_mut_ptr</span>().<span class="ident">offset</span>(<span class="self">self</span>.<span class="ident">vec</span>.<span class="ident">len</span> <span class="kw">as</span> <span class="ident">isize</span>) }
}
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"collection_placement"</span>,
<span class="ident">reason</span> <span class="op">=</span> <span class="string">"placement protocol is subject to change"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"30172"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">InPlace</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">PlaceBack</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Owner</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">T</span>;
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">finalize</span>(<span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">T</span> {
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">pointer</span>();
<span class="self">self</span>.<span class="ident">vec</span>.<span class="ident">len</span> <span class="op">+=</span> <span class="number">1</span>;
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">ptr</span>
}
}
<span class="doccomment">/// A splicing iterator for `Vec`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This struct is created by the [`splice()`] method on [`Vec`]. See its</span>
<span class="doccomment">/// documentation for more.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`splice()`]: struct.Vec.html#method.splice</span>
<span class="doccomment">/// [`Vec`]: struct.Vec.html</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"splice"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"recently added"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32310"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Splice</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">I</span>: <span class="ident">Iterator</span> <span class="op">+</span> <span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">drain</span>: <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">I</span>::<span class="ident">Item</span><span class="op">></span>,
<span class="ident">replace_with</span>: <span class="ident">I</span>,
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"splice"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"recently added"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32310"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">I</span>: <span class="ident">Iterator</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Splice</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">I</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">I</span>::<span class="ident">Item</span>;
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">drain</span>.<span class="ident">next</span>()
}
<span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) {
<span class="self">self</span>.<span class="ident">drain</span>.<span class="ident">size_hint</span>()
}
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"splice"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"recently added"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32310"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">I</span>: <span class="ident">Iterator</span><span class="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">Splice</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">I</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">next_back</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">drain</span>.<span class="ident">next_back</span>()
}
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"splice"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"recently added"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32310"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">I</span>: <span class="ident">Iterator</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">Splice</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">I</span><span class="op">></span> {}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"splice"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"recently added"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"32310"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">I</span>: <span class="ident">Iterator</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">Splice</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">I</span><span class="op">></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="comment">// exhaust drain first</span>
<span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(_) <span class="op">=</span> <span class="self">self</span>.<span class="ident">drain</span>.<span class="ident">next</span>() {}
<span class="kw">unsafe</span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">drain</span>.<span class="ident">tail_len</span> <span class="op">==</span> <span class="number">0</span> {
<span class="self">self</span>.<span class="ident">drain</span>.<span class="ident">vec</span>.<span class="ident">as_mut</span>().<span class="ident">extend</span>(<span class="self">self</span>.<span class="ident">replace_with</span>.<span class="ident">by_ref</span>());
<span class="kw">return</span>
}
<span class="comment">// First fill the range left by drain().</span>
<span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">drain</span>.<span class="ident">fill</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">replace_with</span>) {
<span class="kw">return</span>
}
<span class="comment">// There may be more elements. Use the lower bound as an estimate.</span>
<span class="comment">// FIXME: Is the upper bound a better guess? Or something else?</span>
<span class="kw">let</span> (<span class="ident">lower_bound</span>, <span class="ident">_upper_bound</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">replace_with</span>.<span class="ident">size_hint</span>();
<span class="kw">if</span> <span class="ident">lower_bound</span> <span class="op">></span> <span class="number">0</span> {
<span class="self">self</span>.<span class="ident">drain</span>.<span class="ident">move_tail</span>(<span class="ident">lower_bound</span>);
<span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">drain</span>.<span class="ident">fill</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">replace_with</span>) {
<span class="kw">return</span>
}
}
<span class="comment">// Collect any remaining elements.</span>
<span class="comment">// This is a zero-length vector which does not allocate if `lower_bound` was exact.</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">collected</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">replace_with</span>.<span class="ident">by_ref</span>().<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">I</span>::<span class="ident">Item</span><span class="op">>></span>().<span class="ident">into_iter</span>();
<span class="comment">// Now we have an exact count.</span>
<span class="kw">if</span> <span class="ident">collected</span>.<span class="ident">len</span>() <span class="op">></span> <span class="number">0</span> {
<span class="self">self</span>.<span class="ident">drain</span>.<span class="ident">move_tail</span>(<span class="ident">collected</span>.<span class="ident">len</span>());
<span class="kw">let</span> <span class="ident">filled</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">drain</span>.<span class="ident">fill</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">collected</span>);
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">filled</span>);
<span class="macro">debug_assert_eq</span><span class="macro">!</span>(<span class="ident">collected</span>.<span class="ident">len</span>(), <span class="number">0</span>);
}
}
<span class="comment">// Let `Drain::drop` move the tail back if necessary and restore `vec.len`.</span>
}
}
<span class="doccomment">/// Private helper methods for `Splice::drop`</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// The range from `self.vec.len` to `self.tail_start` contains elements</span>
<span class="doccomment">/// that have been moved out.</span>
<span class="doccomment">/// Fill that range as much as possible with new elements from the `replace_with` iterator.</span>
<span class="doccomment">/// Return whether we filled the entire range. (`replace_with.next()` didn’t return `None`.)</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">fill</span><span class="op"><</span><span class="ident">I</span>: <span class="ident">Iterator</span><span class="op"><</span><span class="ident">Item</span><span class="op">=</span><span class="ident">T</span><span class="op">>></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">replace_with</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">I</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw">let</span> <span class="ident">vec</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">vec</span>.<span class="ident">as_mut</span>();
<span class="kw">let</span> <span class="ident">range_start</span> <span class="op">=</span> <span class="ident">vec</span>.<span class="ident">len</span>;
<span class="kw">let</span> <span class="ident">range_end</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">tail_start</span>;
<span class="kw">let</span> <span class="ident">range_slice</span> <span class="op">=</span> <span class="ident">slice</span>::<span class="ident">from_raw_parts_mut</span>(
<span class="ident">vec</span>.<span class="ident">as_mut_ptr</span>().<span class="ident">offset</span>(<span class="ident">range_start</span> <span class="kw">as</span> <span class="ident">isize</span>),
<span class="ident">range_end</span> <span class="op">-</span> <span class="ident">range_start</span>);
<span class="kw">for</span> <span class="ident">place</span> <span class="kw">in</span> <span class="ident">range_slice</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">new_item</span>) <span class="op">=</span> <span class="ident">replace_with</span>.<span class="ident">next</span>() {
<span class="ident">ptr</span>::<span class="ident">write</span>(<span class="ident">place</span>, <span class="ident">new_item</span>);
<span class="ident">vec</span>.<span class="ident">len</span> <span class="op">+=</span> <span class="number">1</span>;
} <span class="kw">else</span> {
<span class="kw">return</span> <span class="bool-val">false</span>
}
}
<span class="bool-val">true</span>
}
<span class="doccomment">/// Make room for inserting more elements before the tail.</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">move_tail</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">extra_capacity</span>: <span class="ident">usize</span>) {
<span class="kw">let</span> <span class="ident">vec</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">vec</span>.<span class="ident">as_mut</span>();
<span class="kw">let</span> <span class="ident">used_capacity</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">tail_start</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">tail_len</span>;
<span class="ident">vec</span>.<span class="ident">buf</span>.<span class="ident">reserve</span>(<span class="ident">used_capacity</span>, <span class="ident">extra_capacity</span>);
<span class="kw">let</span> <span class="ident">new_tail_start</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">tail_start</span> <span class="op">+</span> <span class="ident">extra_capacity</span>;
<span class="kw">let</span> <span class="ident">src</span> <span class="op">=</span> <span class="ident">vec</span>.<span class="ident">as_ptr</span>().<span class="ident">offset</span>(<span class="self">self</span>.<span class="ident">tail_start</span> <span class="kw">as</span> <span class="ident">isize</span>);
<span class="kw">let</span> <span class="ident">dst</span> <span class="op">=</span> <span class="ident">vec</span>.<span class="ident">as_mut_ptr</span>().<span class="ident">offset</span>(<span class="ident">new_tail_start</span> <span class="kw">as</span> <span class="ident">isize</span>);
<span class="ident">ptr</span>::<span class="ident">copy</span>(<span class="ident">src</span>, <span class="ident">dst</span>, <span class="self">self</span>.<span class="ident">tail_len</span>);
<span class="self">self</span>.<span class="ident">tail_start</span> <span class="op">=</span> <span class="ident">new_tail_start</span>;
}
}
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