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</pre><pre class="rust"><code><span class="kw">use super</span>::<span class="kw-2">*</span>;
<span class="kw">use </span>core::convert::{TryFrom, TryInto};
<span class="attribute">#[cfg(feature = <span class="string">&quot;serde&quot;</span>)]
</span><span class="kw">use </span>core::marker::PhantomData;
<span class="attribute">#[cfg(feature = <span class="string">&quot;serde&quot;</span>)]
</span><span class="kw">use </span>serde::de::{
Deserialize, Deserializer, Error <span class="kw">as </span>DeserializeError, SeqAccess, Visitor,
};
<span class="attribute">#[cfg(feature = <span class="string">&quot;serde&quot;</span>)]
</span><span class="kw">use </span>serde::ser::{Serialize, SerializeSeq, Serializer};
<span class="doccomment">/// Helper to make an `ArrayVec`.
///
/// You specify the backing array type, and optionally give all the elements you
/// want to initially place into the array.
///
/// ```rust
/// use tinyvec::*;
///
/// // The backing array type can be specified in the macro call
/// let empty_av = array_vec!([u8; 16]);
/// let some_ints = array_vec!([i32; 4] =&gt; 1, 2, 3);
///
/// // Or left to inference
/// let empty_av: ArrayVec&lt;[u8; 10]&gt; = array_vec!();
/// let some_ints: ArrayVec&lt;[u8; 10]&gt; = array_vec!(5, 6, 7, 8);
/// ```
</span><span class="attribute">#[macro_export]
</span><span class="macro">macro_rules! </span>array_vec {
(<span class="macro-nonterminal">$array_type</span>:ty =&gt; $(<span class="macro-nonterminal">$elem</span>:expr),* $(,)<span class="question-mark">?</span>) =&gt; {
{
<span class="kw">let </span><span class="kw-2">mut </span>av: <span class="macro-nonterminal">$crate::ArrayVec</span>&lt;<span class="macro-nonterminal">$array_type</span>&gt; = Default::default();
$( av.push(<span class="macro-nonterminal">$elem</span>); )*
av
}
};
(<span class="macro-nonterminal">$array_type</span>:ty) =&gt; {
<span class="macro-nonterminal">$crate::ArrayVec</span>::&lt;<span class="macro-nonterminal">$array_type</span>&gt;::default()
};
($(<span class="macro-nonterminal">$elem</span>:expr),<span class="kw-2">*</span>) =&gt; {
<span class="macro-nonterminal">$</span><span class="macro">crate::array_vec!</span>(<span class="kw">_ </span>=&gt; $(<span class="macro-nonterminal">$elem</span>),<span class="kw-2">*</span>)
};
(<span class="macro-nonterminal">$elem</span>:expr; <span class="macro-nonterminal">$n</span>:expr) =&gt; {
<span class="macro-nonterminal">$crate::ArrayVec::from</span>([<span class="macro-nonterminal">$elem</span>; <span class="macro-nonterminal">$n</span>])
};
() =&gt; {
<span class="macro-nonterminal">$</span><span class="macro">crate::array_vec!</span>(<span class="kw">_</span>)
};
}
<span class="doccomment">/// An array-backed, vector-like data structure.
///
/// * `ArrayVec` has a fixed capacity, equal to the array size.
/// * `ArrayVec` has a variable length, as you add and remove elements. Attempts
/// to fill the vec beyond its capacity will cause a panic.
/// * All of the vec&#39;s array slots are always initialized in terms of Rust&#39;s
/// memory model. When you remove a element from a location, the old value at
/// that location is replaced with the type&#39;s default value.
///
/// The overall API of this type is intended to, as much as possible, emulate
/// the API of the [`Vec`](https://doc.rust-lang.org/alloc/vec/struct.Vec.html)
/// type.
///
/// ## Construction
///
/// You can use the `array_vec!` macro similarly to how you might use the `vec!`
/// macro. Specify the array type, then optionally give all the initial values
/// you want to have.
/// ```rust
/// # use tinyvec::*;
/// let some_ints = array_vec!([i32; 4] =&gt; 1, 2, 3);
/// assert_eq!(some_ints.len(), 3);
/// ```
///
/// The [`default`](ArrayVec::new) for an `ArrayVec` is to have a default
/// array with length 0. The [`new`](ArrayVec::new) method is the same as
/// calling `default`
/// ```rust
/// # use tinyvec::*;
/// let some_ints = ArrayVec::&lt;[i32; 7]&gt;::default();
/// assert_eq!(some_ints.len(), 0);
///
/// let more_ints = ArrayVec::&lt;[i32; 7]&gt;::new();
/// assert_eq!(some_ints, more_ints);
/// ```
///
/// If you have an array and want the _whole thing_ so count as being &quot;in&quot; the
/// new `ArrayVec` you can use one of the `from` implementations. If you want
/// _part of_ the array then you can use
/// [`from_array_len`](ArrayVec::from_array_len):
/// ```rust
/// # use tinyvec::*;
/// let some_ints = ArrayVec::from([5, 6, 7, 8]);
/// assert_eq!(some_ints.len(), 4);
///
/// let more_ints = ArrayVec::from_array_len([5, 6, 7, 8], 2);
/// assert_eq!(more_ints.len(), 2);
///
/// let no_ints: ArrayVec&lt;[u8; 5]&gt; = ArrayVec::from_array_empty([1, 2, 3, 4, 5]);
/// assert_eq!(no_ints.len(), 0);
/// ```
</span><span class="attribute">#[<span class="macro-nonterminal">repr</span>(C)]
</span><span class="kw">pub struct </span>ArrayVec&lt;A&gt; {
len: u16,
<span class="kw">pub</span>(<span class="kw">crate</span>) data: A,
}
<span class="kw">impl</span>&lt;A&gt; Clone <span class="kw">for </span>ArrayVec&lt;A&gt;
<span class="kw">where
</span>A: Array + Clone,
A::Item: Clone,
{
<span class="attribute">#[inline]
</span><span class="kw">fn </span>clone(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self </span>{
<span class="self">Self </span>{ data: <span class="self">self</span>.data.clone(), len: <span class="self">self</span>.len }
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>clone_from(<span class="kw-2">&amp;mut </span><span class="self">self</span>, o: <span class="kw-2">&amp;</span><span class="self">Self</span>) {
<span class="kw">let </span>iter = <span class="self">self
</span>.data
.as_slice_mut()
.iter_mut()
.zip(o.data.as_slice())
.take(<span class="self">self</span>.len.max(o.len) <span class="kw">as </span>usize);
<span class="kw">for </span>(dst, src) <span class="kw">in </span>iter {
dst.clone_from(src)
}
<span class="kw">if let </span><span class="prelude-val">Some</span>(to_drop) =
<span class="self">self</span>.data.as_slice_mut().get_mut((o.len <span class="kw">as </span>usize)..(<span class="self">self</span>.len <span class="kw">as </span>usize))
{
to_drop.iter_mut().for_each(|x| drop(take(x)));
}
<span class="self">self</span>.len = o.len;
}
}
<span class="kw">impl</span>&lt;A&gt; Copy <span class="kw">for </span>ArrayVec&lt;A&gt;
<span class="kw">where
</span>A: Array + Copy,
A::Item: Copy,
{
}
<span class="kw">impl</span>&lt;A: Array&gt; Default <span class="kw">for </span>ArrayVec&lt;A&gt; {
<span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
<span class="self">Self </span>{ len: <span class="number">0</span>, data: A::default() }
}
}
<span class="kw">impl</span>&lt;A: Array&gt; Deref <span class="kw">for </span>ArrayVec&lt;A&gt; {
<span class="kw">type </span>Target = [A::Item];
<span class="attribute">#[inline(always)]
#[must_use]
</span><span class="kw">fn </span>deref(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span><span class="self">Self</span>::Target {
<span class="kw-2">&amp;</span><span class="self">self</span>.data.as_slice()[..<span class="self">self</span>.len <span class="kw">as </span>usize]
}
}
<span class="kw">impl</span>&lt;A: Array&gt; DerefMut <span class="kw">for </span>ArrayVec&lt;A&gt; {
<span class="attribute">#[inline(always)]
#[must_use]
</span><span class="kw">fn </span>deref_mut(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self</span>::Target {
<span class="kw-2">&amp;mut </span><span class="self">self</span>.data.as_slice_mut()[..<span class="self">self</span>.len <span class="kw">as </span>usize]
}
}
<span class="kw">impl</span>&lt;A: Array, I: SliceIndex&lt;[A::Item]&gt;&gt; Index&lt;I&gt; <span class="kw">for </span>ArrayVec&lt;A&gt; {
<span class="kw">type </span>Output = &lt;I <span class="kw">as </span>SliceIndex&lt;[A::Item]&gt;&gt;::Output;
<span class="attribute">#[inline(always)]
#[must_use]
</span><span class="kw">fn </span>index(<span class="kw-2">&amp;</span><span class="self">self</span>, index: I) -&gt; <span class="kw-2">&amp;</span><span class="self">Self</span>::Output {
<span class="kw-2">&amp;</span><span class="self">self</span>.deref()[index]
}
}
<span class="kw">impl</span>&lt;A: Array, I: SliceIndex&lt;[A::Item]&gt;&gt; IndexMut&lt;I&gt; <span class="kw">for </span>ArrayVec&lt;A&gt; {
<span class="attribute">#[inline(always)]
#[must_use]
</span><span class="kw">fn </span>index_mut(<span class="kw-2">&amp;mut </span><span class="self">self</span>, index: I) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self</span>::Output {
<span class="kw-2">&amp;mut </span><span class="self">self</span>.deref_mut()[index]
}
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;serde&quot;</span>)]
#[cfg_attr(docs_rs, doc(cfg(feature = <span class="string">&quot;serde&quot;</span>)))]
</span><span class="kw">impl</span>&lt;A: Array&gt; Serialize <span class="kw">for </span>ArrayVec&lt;A&gt;
<span class="kw">where
</span>A::Item: Serialize,
{
<span class="attribute">#[must_use]
</span><span class="kw">fn </span>serialize&lt;S&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, serializer: S) -&gt; <span class="prelude-ty">Result</span>&lt;S::Ok, S::Error&gt;
<span class="kw">where
</span>S: Serializer,
{
<span class="kw">let </span><span class="kw-2">mut </span>seq = serializer.serialize_seq(<span class="prelude-val">Some</span>(<span class="self">self</span>.len()))<span class="question-mark">?</span>;
<span class="kw">for </span>element <span class="kw">in </span><span class="self">self</span>.iter() {
seq.serialize_element(element)<span class="question-mark">?</span>;
}
seq.end()
}
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;serde&quot;</span>)]
#[cfg_attr(docs_rs, doc(cfg(feature = <span class="string">&quot;serde&quot;</span>)))]
</span><span class="kw">impl</span>&lt;<span class="lifetime">&#39;de</span>, A: Array&gt; Deserialize&lt;<span class="lifetime">&#39;de</span>&gt; <span class="kw">for </span>ArrayVec&lt;A&gt;
<span class="kw">where
</span>A::Item: Deserialize&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="kw">fn </span>deserialize&lt;D&gt;(deserializer: D) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, D::Error&gt;
<span class="kw">where
</span>D: Deserializer&lt;<span class="lifetime">&#39;de</span>&gt;,
{
deserializer.deserialize_seq(ArrayVecVisitor(PhantomData))
}
}
<span class="attribute">#[cfg(all(feature = <span class="string">&quot;arbitrary&quot;</span>, feature = <span class="string">&quot;nightly_const_generics&quot;</span>))]
#[cfg_attr(
docs_rs,
doc(cfg(all(feature = <span class="string">&quot;arbitrary&quot;</span>, feature = <span class="string">&quot;nightly_const_generics&quot;</span>)))
)]
</span><span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, T, <span class="kw">const </span>N: usize&gt; arbitrary::Arbitrary&lt;<span class="lifetime">&#39;a</span>&gt; <span class="kw">for </span>ArrayVec&lt;[T; N]&gt;
<span class="kw">where
</span>T: arbitrary::Arbitrary&lt;<span class="lifetime">&#39;a</span>&gt; + Default,
{
<span class="kw">fn </span>arbitrary(u: <span class="kw-2">&amp;mut </span>arbitrary::Unstructured&lt;<span class="lifetime">&#39;a</span>&gt;) -&gt; arbitrary::Result&lt;<span class="self">Self</span>&gt; {
<span class="kw">let </span>v = &lt;[T; N]&gt;::arbitrary(u)<span class="question-mark">?</span>;
<span class="kw">let </span>av = ArrayVec::from(v);
<span class="prelude-val">Ok</span>(av)
}
}
<span class="kw">impl</span>&lt;A: Array&gt; ArrayVec&lt;A&gt; {
<span class="doccomment">/// Move all values from `other` into this vec.
///
/// ## Panics
/// * If the vec overflows its capacity
///
/// ## Example
/// ```rust
/// # use tinyvec::*;
/// let mut av = array_vec!([i32; 10] =&gt; 1, 2, 3);
/// let mut av2 = array_vec!([i32; 10] =&gt; 4, 5, 6);
/// av.append(&amp;mut av2);
/// assert_eq!(av, &amp;[1, 2, 3, 4, 5, 6][..]);
/// assert_eq!(av2, &amp;[][..]);
/// ```
</span><span class="attribute">#[inline]
</span><span class="kw">pub fn </span>append(<span class="kw-2">&amp;mut </span><span class="self">self</span>, other: <span class="kw-2">&amp;mut </span><span class="self">Self</span>) {
<span class="macro">assert!</span>(
<span class="self">self</span>.try_append(other).is_none(),
<span class="string">&quot;ArrayVec::append&gt; total length {} exceeds capacity {}!&quot;</span>,
<span class="self">self</span>.len() + other.len(),
A::CAPACITY
);
}
<span class="doccomment">/// Move all values from `other` into this vec.
/// If appending would overflow the capacity, Some(other) is returned.
/// ## Example
/// ```rust
/// # use tinyvec::*;
/// let mut av = array_vec!([i32; 7] =&gt; 1, 2, 3);
/// let mut av2 = array_vec!([i32; 7] =&gt; 4, 5, 6);
/// av.append(&amp;mut av2);
/// assert_eq!(av, &amp;[1, 2, 3, 4, 5, 6][..]);
/// assert_eq!(av2, &amp;[][..]);
///
/// let mut av3 = array_vec!([i32; 7] =&gt; 7, 8, 9);
/// assert!(av.try_append(&amp;mut av3).is_some());
/// assert_eq!(av, &amp;[1, 2, 3, 4, 5, 6][..]);
/// assert_eq!(av3, &amp;[7, 8, 9][..]);
/// ```
</span><span class="attribute">#[inline]
</span><span class="kw">pub fn </span>try_append&lt;<span class="lifetime">&#39;other</span>&gt;(
<span class="kw-2">&amp;mut </span><span class="self">self</span>, other: <span class="kw-2">&amp;</span><span class="lifetime">&#39;other </span><span class="kw-2">mut </span><span class="self">Self</span>,
) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;other </span><span class="kw-2">mut </span><span class="self">Self</span>&gt; {
<span class="kw">let </span>new_len = <span class="self">self</span>.len() + other.len();
<span class="kw">if </span>new_len &gt; A::CAPACITY {
<span class="kw">return </span><span class="prelude-val">Some</span>(other);
}
<span class="kw">let </span>iter = other.iter_mut().map(take);
<span class="kw">for </span>item <span class="kw">in </span>iter {
<span class="self">self</span>.push(item);
}
other.set_len(<span class="number">0</span>);
<span class="kw">return </span><span class="prelude-val">None</span>;
}
<span class="doccomment">/// A `*mut` pointer to the backing array.
///
/// ## Safety
///
/// This pointer has provenance over the _entire_ backing array.
</span><span class="attribute">#[inline(always)]
#[must_use]
</span><span class="kw">pub fn </span>as_mut_ptr(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">*mut </span>A::Item {
<span class="self">self</span>.data.as_slice_mut().as_mut_ptr()
}
<span class="doccomment">/// Performs a `deref_mut`, into unique slice form.
</span><span class="attribute">#[inline(always)]
#[must_use]
</span><span class="kw">pub fn </span>as_mut_slice(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>[A::Item] {
<span class="self">self</span>.deref_mut()
}
<span class="doccomment">/// A `*const` pointer to the backing array.
///
/// ## Safety
///
/// This pointer has provenance over the _entire_ backing array.
</span><span class="attribute">#[inline(always)]
#[must_use]
</span><span class="kw">pub fn </span>as_ptr(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">*const </span>A::Item {
<span class="self">self</span>.data.as_slice().as_ptr()
}
<span class="doccomment">/// Performs a `deref`, into shared slice form.
</span><span class="attribute">#[inline(always)]
#[must_use]
</span><span class="kw">pub fn </span>as_slice(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>[A::Item] {
<span class="self">self</span>.deref()
}
<span class="doccomment">/// The capacity of the `ArrayVec`.
///
/// This is fixed based on the array type, but can&#39;t yet be made a `const fn`
/// on Stable Rust.
</span><span class="attribute">#[inline(always)]
#[must_use]
</span><span class="kw">pub fn </span>capacity(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
<span class="comment">// Note: This shouldn&#39;t use A::CAPACITY, because unsafe code can&#39;t rely on
// any Array invariants. This ensures that at the very least, the returned
// value is a valid length for a subslice of the backing array.
</span><span class="self">self</span>.data.as_slice().len()
}
<span class="doccomment">/// Truncates the `ArrayVec` down to length 0.
</span><span class="attribute">#[inline(always)]
</span><span class="kw">pub fn </span>clear(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
<span class="self">self</span>.truncate(<span class="number">0</span>)
}
<span class="doccomment">/// Creates a draining iterator that removes the specified range in the vector
/// and yields the removed items.
///
/// ## Panics
/// * If the start is greater than the end
/// * If the end is past the edge of the vec.
///
/// ## Example
/// ```rust
/// # use tinyvec::*;
/// let mut av = array_vec!([i32; 4] =&gt; 1, 2, 3);
/// let av2: ArrayVec&lt;[i32; 4]&gt; = av.drain(1..).collect();
/// assert_eq!(av.as_slice(), &amp;[1][..]);
/// assert_eq!(av2.as_slice(), &amp;[2, 3][..]);
///
/// av.drain(..);
/// assert_eq!(av.as_slice(), &amp;[]);
/// ```
</span><span class="attribute">#[inline]
</span><span class="kw">pub fn </span>drain&lt;R&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, range: R) -&gt; ArrayVecDrain&lt;<span class="lifetime">&#39;_</span>, A::Item&gt;
<span class="kw">where
</span>R: RangeBounds&lt;usize&gt;,
{
ArrayVecDrain::new(<span class="self">self</span>, range)
}
<span class="doccomment">/// Returns the inner array of the `ArrayVec`.
///
/// This returns the full array, even if the `ArrayVec` length is currently
/// less than that.
///
/// ## Example
///
/// ```rust
/// # use tinyvec::{array_vec, ArrayVec};
/// let mut favorite_numbers = array_vec!([i32; 5] =&gt; 87, 48, 33, 9, 26);
/// assert_eq!(favorite_numbers.clone().into_inner(), [87, 48, 33, 9, 26]);
///
/// favorite_numbers.pop();
/// assert_eq!(favorite_numbers.into_inner(), [87, 48, 33, 9, 0]);
/// ```
///
/// A use for this function is to build an array from an iterator by first
/// collecting it into an `ArrayVec`.
///
/// ```rust
/// # use tinyvec::ArrayVec;
/// let arr_vec: ArrayVec&lt;[i32; 10]&gt; = (1..=3).cycle().take(10).collect();
/// let inner = arr_vec.into_inner();
/// assert_eq!(inner, [1, 2, 3, 1, 2, 3, 1, 2, 3, 1]);
/// ```
</span><span class="attribute">#[inline]
</span><span class="kw">pub fn </span>into_inner(<span class="self">self</span>) -&gt; A {
<span class="self">self</span>.data
}
<span class="doccomment">/// Clone each element of the slice into this `ArrayVec`.
///
/// ## Panics
/// * If the `ArrayVec` would overflow, this will panic.
</span><span class="attribute">#[inline]
</span><span class="kw">pub fn </span>extend_from_slice(<span class="kw-2">&amp;mut </span><span class="self">self</span>, sli: <span class="kw-2">&amp;</span>[A::Item])
<span class="kw">where
</span>A::Item: Clone,
{
<span class="kw">if </span>sli.is_empty() {
<span class="kw">return</span>;
}
<span class="kw">let </span>new_len = <span class="self">self</span>.len <span class="kw">as </span>usize + sli.len();
<span class="macro">assert!</span>(
new_len &lt;= A::CAPACITY,
<span class="string">&quot;ArrayVec::extend_from_slice&gt; total length {} exceeds capacity {}!&quot;</span>,
new_len,
A::CAPACITY
);
<span class="kw">let </span>target = <span class="kw-2">&amp;mut </span><span class="self">self</span>.data.as_slice_mut()[<span class="self">self</span>.len <span class="kw">as </span>usize..new_len];
target.clone_from_slice(sli);
<span class="self">self</span>.set_len(new_len);
}
<span class="doccomment">/// Fill the vector until its capacity has been reached.
///
/// Successively fills unused space in the spare slice of the vector with
/// elements from the iterator. It then returns the remaining iterator
/// without exhausting it. This also allows appending the head of an
/// infinite iterator.
///
/// This is an alternative to `Extend::extend` method for cases where the
/// length of the iterator can not be checked. Since this vector can not
/// reallocate to increase its capacity, it is unclear what to do with
/// remaining elements in the iterator and the iterator itself. The
/// interface also provides no way to communicate this to the caller.
///
/// ## Panics
/// * If the `next` method of the provided iterator panics.
///
/// ## Example
///
/// ```rust
/// # use tinyvec::*;
/// let mut av = array_vec!([i32; 4]);
/// let mut to_inf = av.fill(0..);
/// assert_eq!(&amp;av[..], [0, 1, 2, 3]);
/// assert_eq!(to_inf.next(), Some(4));
/// ```
</span><span class="attribute">#[inline]
</span><span class="kw">pub fn </span>fill&lt;I: IntoIterator&lt;Item = A::Item&gt;&gt;(
<span class="kw-2">&amp;mut </span><span class="self">self</span>, iter: I,
) -&gt; I::IntoIter {
<span class="comment">// If this is written as a call to push for each element in iter, the
// compiler emits code that updates the length for every element. The
// additional complexity from that length update is worth nearly 2x in
// the runtime of this function.
</span><span class="kw">let </span><span class="kw-2">mut </span>iter = iter.into_iter();
<span class="kw">let </span><span class="kw-2">mut </span>pushed = <span class="number">0</span>;
<span class="kw">let </span>to_take = <span class="self">self</span>.capacity() - <span class="self">self</span>.len();
<span class="kw">let </span>target = <span class="kw-2">&amp;mut </span><span class="self">self</span>.data.as_slice_mut()[<span class="self">self</span>.len <span class="kw">as </span>usize..];
<span class="kw">for </span>element <span class="kw">in </span>iter.by_ref().take(to_take) {
target[pushed] = element;
pushed += <span class="number">1</span>;
}
<span class="self">self</span>.len += pushed <span class="kw">as </span>u16;
iter
}
<span class="doccomment">/// Wraps up an array and uses the given length as the initial length.
///
/// If you want to simply use the full array, use `from` instead.
///
/// ## Panics
///
/// * The length specified must be less than or equal to the capacity of the
/// array.
</span><span class="attribute">#[inline]
#[must_use]
#[allow(clippy::match_wild_err_arm)]
</span><span class="kw">pub fn </span>from_array_len(data: A, len: usize) -&gt; <span class="self">Self </span>{
<span class="kw">match </span><span class="self">Self</span>::try_from_array_len(data, len) {
<span class="prelude-val">Ok</span>(out) =&gt; out,
<span class="prelude-val">Err</span>(<span class="kw">_</span>) =&gt; <span class="macro">panic!</span>(
<span class="string">&quot;ArrayVec::from_array_len&gt; length {} exceeds capacity {}!&quot;</span>,
len,
A::CAPACITY
),
}
}
<span class="doccomment">/// Inserts an item at the position given, moving all following elements +1
/// index.
///
/// ## Panics
/// * If `index` &gt; `len`
/// * If the capacity is exhausted
///
/// ## Example
/// ```rust
/// use tinyvec::*;
/// let mut av = array_vec!([i32; 10] =&gt; 1, 2, 3);
/// av.insert(1, 4);
/// assert_eq!(av.as_slice(), &amp;[1, 4, 2, 3]);
/// av.insert(4, 5);
/// assert_eq!(av.as_slice(), &amp;[1, 4, 2, 3, 5]);
/// ```
</span><span class="attribute">#[inline]
</span><span class="kw">pub fn </span>insert(<span class="kw-2">&amp;mut </span><span class="self">self</span>, index: usize, item: A::Item) {
<span class="kw">let </span>x = <span class="self">self</span>.try_insert(index, item);
<span class="macro">assert!</span>(x.is_none(), <span class="string">&quot;ArrayVec::insert&gt; capacity overflow!&quot;</span>);
}
<span class="doccomment">/// Tries to insert an item at the position given, moving all following
/// elements +1 index.
/// Returns back the element if the capacity is exhausted,
/// otherwise returns None.
///
/// ## Panics
/// * If `index` &gt; `len`
///
/// ## Example
/// ```rust
/// use tinyvec::*;
/// let mut av = array_vec!([&amp;&#39;static str; 4] =&gt; &quot;one&quot;, &quot;two&quot;, &quot;three&quot;);
/// av.insert(1, &quot;four&quot;);
/// assert_eq!(av.as_slice(), &amp;[&quot;one&quot;, &quot;four&quot;, &quot;two&quot;, &quot;three&quot;]);
/// assert_eq!(av.try_insert(4, &quot;five&quot;), Some(&quot;five&quot;));
/// ```
</span><span class="attribute">#[inline]
</span><span class="kw">pub fn </span>try_insert(
<span class="kw-2">&amp;mut </span><span class="self">self</span>, index: usize, <span class="kw-2">mut </span>item: A::Item,
) -&gt; <span class="prelude-ty">Option</span>&lt;A::Item&gt; {
<span class="macro">assert!</span>(
index &lt;= <span class="self">self</span>.len <span class="kw">as </span>usize,
<span class="string">&quot;ArrayVec::try_insert&gt; index {} is out of bounds {}&quot;</span>,
index,
<span class="self">self</span>.len
);
<span class="comment">// A previous implementation used self.try_push and slice::rotate_right
// rotate_right and rotate_left generate a huge amount of code and fail to
// inline; calling them here incurs the cost of all the cases they
// handle even though we&#39;re rotating a usually-small array by a constant
// 1 offset. This swap-based implementation benchmarks much better for
// small array lengths in particular.
</span><span class="kw">if </span>(<span class="self">self</span>.len <span class="kw">as </span>usize) &lt; A::CAPACITY {
<span class="self">self</span>.len += <span class="number">1</span>;
} <span class="kw">else </span>{
<span class="kw">return </span><span class="prelude-val">Some</span>(item);
}
<span class="kw">let </span>target = <span class="kw-2">&amp;mut </span><span class="self">self</span>.as_mut_slice()[index..];
<span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..target.len() {
core::mem::swap(<span class="kw-2">&amp;mut </span>item, <span class="kw-2">&amp;mut </span>target[i]);
}
<span class="kw">return </span><span class="prelude-val">None</span>;
}
<span class="doccomment">/// Checks if the length is 0.
</span><span class="attribute">#[inline(always)]
#[must_use]
</span><span class="kw">pub fn </span>is_empty(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="self">self</span>.len == <span class="number">0
</span>}
<span class="doccomment">/// The length of the `ArrayVec` (in elements).
</span><span class="attribute">#[inline(always)]
#[must_use]
</span><span class="kw">pub fn </span>len(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
<span class="self">self</span>.len <span class="kw">as </span>usize
}
<span class="doccomment">/// Makes a new, empty `ArrayVec`.
</span><span class="attribute">#[inline(always)]
#[must_use]
</span><span class="kw">pub fn </span>new() -&gt; <span class="self">Self </span>{
<span class="self">Self</span>::default()
}
<span class="doccomment">/// Remove and return the last element of the vec, if there is one.
///
/// ## Failure
/// * If the vec is empty you get `None`.
///
/// ## Example
/// ```rust
/// # use tinyvec::*;
/// let mut av = array_vec!([i32; 10] =&gt; 1, 2);
/// assert_eq!(av.pop(), Some(2));
/// assert_eq!(av.pop(), Some(1));
/// assert_eq!(av.pop(), None);
/// ```
</span><span class="attribute">#[inline]
</span><span class="kw">pub fn </span>pop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;A::Item&gt; {
<span class="kw">if </span><span class="self">self</span>.len &gt; <span class="number">0 </span>{
<span class="self">self</span>.len -= <span class="number">1</span>;
<span class="kw">let </span>out = take(<span class="kw-2">&amp;mut </span><span class="self">self</span>.data.as_slice_mut()[<span class="self">self</span>.len <span class="kw">as </span>usize]);
<span class="prelude-val">Some</span>(out)
} <span class="kw">else </span>{
<span class="prelude-val">None
</span>}
}
<span class="doccomment">/// Place an element onto the end of the vec.
///
/// ## Panics
/// * If the length of the vec would overflow the capacity.
///
/// ## Example
/// ```rust
/// # use tinyvec::*;
/// let mut av = array_vec!([i32; 2]);
/// assert_eq!(&amp;av[..], []);
/// av.push(1);
/// assert_eq!(&amp;av[..], [1]);
/// av.push(2);
/// assert_eq!(&amp;av[..], [1, 2]);
/// // av.push(3); this would overflow the ArrayVec and panic!
/// ```
</span><span class="attribute">#[inline(always)]
</span><span class="kw">pub fn </span>push(<span class="kw-2">&amp;mut </span><span class="self">self</span>, val: A::Item) {
<span class="kw">let </span>x = <span class="self">self</span>.try_push(val);
<span class="macro">assert!</span>(x.is_none(), <span class="string">&quot;ArrayVec::push&gt; capacity overflow!&quot;</span>);
}
<span class="doccomment">/// Tries to place an element onto the end of the vec.\
/// Returns back the element if the capacity is exhausted,
/// otherwise returns None.
/// ```rust
/// # use tinyvec::*;
/// let mut av = array_vec!([i32; 2]);
/// assert_eq!(av.as_slice(), []);
/// assert_eq!(av.try_push(1), None);
/// assert_eq!(&amp;av[..], [1]);
/// assert_eq!(av.try_push(2), None);
/// assert_eq!(&amp;av[..], [1, 2]);
/// assert_eq!(av.try_push(3), Some(3));
/// ```
</span><span class="attribute">#[inline(always)]
</span><span class="kw">pub fn </span>try_push(<span class="kw-2">&amp;mut </span><span class="self">self</span>, val: A::Item) -&gt; <span class="prelude-ty">Option</span>&lt;A::Item&gt; {
<span class="macro">debug_assert!</span>(<span class="self">self</span>.len <span class="kw">as </span>usize &lt;= A::CAPACITY);
<span class="kw">let </span>itemref = <span class="kw">match </span><span class="self">self</span>.data.as_slice_mut().get_mut(<span class="self">self</span>.len <span class="kw">as </span>usize) {
<span class="prelude-val">None </span>=&gt; <span class="kw">return </span><span class="prelude-val">Some</span>(val),
<span class="prelude-val">Some</span>(x) =&gt; x,
};
<span class="kw-2">*</span>itemref = val;
<span class="self">self</span>.len += <span class="number">1</span>;
<span class="kw">return </span><span class="prelude-val">None</span>;
}
<span class="doccomment">/// Removes the item at `index`, shifting all others down by one index.
///
/// Returns the removed element.
///
/// ## Panics
///
/// * If the index is out of bounds.
///
/// ## Example
///
/// ```rust
/// # use tinyvec::*;
/// let mut av = array_vec!([i32; 4] =&gt; 1, 2, 3);
/// assert_eq!(av.remove(1), 2);
/// assert_eq!(&amp;av[..], [1, 3]);
/// ```
</span><span class="attribute">#[inline]
</span><span class="kw">pub fn </span>remove(<span class="kw-2">&amp;mut </span><span class="self">self</span>, index: usize) -&gt; A::Item {
<span class="kw">let </span>targets: <span class="kw-2">&amp;mut </span>[A::Item] = <span class="kw-2">&amp;mut </span><span class="self">self</span>.deref_mut()[index..];
<span class="kw">let </span>item = take(<span class="kw-2">&amp;mut </span>targets[<span class="number">0</span>]);
<span class="comment">// A previous implementation used rotate_left
// rotate_right and rotate_left generate a huge amount of code and fail to
// inline; calling them here incurs the cost of all the cases they
// handle even though we&#39;re rotating a usually-small array by a constant
// 1 offset. This swap-based implementation benchmarks much better for
// small array lengths in particular.
</span><span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..targets.len() - <span class="number">1 </span>{
targets.swap(i, i + <span class="number">1</span>);
}
<span class="self">self</span>.len -= <span class="number">1</span>;
item
}
<span class="doccomment">/// As [`resize_with`](ArrayVec::resize_with)
/// and it clones the value as the closure.
///
/// ## Example
///
/// ```rust
/// # use tinyvec::*;
///
/// let mut av = array_vec!([&amp;str; 10] =&gt; &quot;hello&quot;);
/// av.resize(3, &quot;world&quot;);
/// assert_eq!(&amp;av[..], [&quot;hello&quot;, &quot;world&quot;, &quot;world&quot;]);
///
/// let mut av = array_vec!([i32; 10] =&gt; 1, 2, 3, 4);
/// av.resize(2, 0);
/// assert_eq!(&amp;av[..], [1, 2]);
/// ```
</span><span class="attribute">#[inline]
</span><span class="kw">pub fn </span>resize(<span class="kw-2">&amp;mut </span><span class="self">self</span>, new_len: usize, new_val: A::Item)
<span class="kw">where
</span>A::Item: Clone,
{
<span class="self">self</span>.resize_with(new_len, || new_val.clone())
}
<span class="doccomment">/// Resize the vec to the new length.
///
/// If it needs to be longer, it&#39;s filled with repeated calls to the provided
/// function. If it needs to be shorter, it&#39;s truncated.
///
/// ## Example
///
/// ```rust
/// # use tinyvec::*;
///
/// let mut av = array_vec!([i32; 10] =&gt; 1, 2, 3);
/// av.resize_with(5, Default::default);
/// assert_eq!(&amp;av[..], [1, 2, 3, 0, 0]);
///
/// let mut av = array_vec!([i32; 10]);
/// let mut p = 1;
/// av.resize_with(4, || {
/// p *= 2;
/// p
/// });
/// assert_eq!(&amp;av[..], [2, 4, 8, 16]);
/// ```
</span><span class="attribute">#[inline]
</span><span class="kw">pub fn </span>resize_with&lt;F: FnMut() -&gt; A::Item&gt;(
<span class="kw-2">&amp;mut </span><span class="self">self</span>, new_len: usize, <span class="kw-2">mut </span>f: F,
) {
<span class="kw">match </span>new_len.checked_sub(<span class="self">self</span>.len <span class="kw">as </span>usize) {
<span class="prelude-val">None </span>=&gt; <span class="self">self</span>.truncate(new_len),
<span class="prelude-val">Some</span>(new_elements) =&gt; {
<span class="kw">for _ in </span><span class="number">0</span>..new_elements {
<span class="self">self</span>.push(f());
}
}
}
}
<span class="doccomment">/// Walk the vec and keep only the elements that pass the predicate given.
///
/// ## Example
///
/// ```rust
/// # use tinyvec::*;
///
/// let mut av = array_vec!([i32; 10] =&gt; 1, 1, 2, 3, 3, 4);
/// av.retain(|&amp;x| x % 2 == 0);
/// assert_eq!(&amp;av[..], [2, 4]);
/// ```
</span><span class="attribute">#[inline]
</span><span class="kw">pub fn </span>retain&lt;F: FnMut(<span class="kw-2">&amp;</span>A::Item) -&gt; bool&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, <span class="kw-2">mut </span>acceptable: F) {
<span class="comment">// Drop guard to contain exactly the remaining elements when the test
// panics.
</span><span class="kw">struct </span>JoinOnDrop&lt;<span class="lifetime">&#39;vec</span>, Item&gt; {
items: <span class="kw-2">&amp;</span><span class="lifetime">&#39;vec </span><span class="kw-2">mut </span>[Item],
done_end: usize,
<span class="comment">// Start of tail relative to `done_end`.
</span>tail_start: usize,
}
<span class="kw">impl</span>&lt;Item&gt; Drop <span class="kw">for </span>JoinOnDrop&lt;<span class="lifetime">&#39;_</span>, Item&gt; {
<span class="kw">fn </span>drop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
<span class="self">self</span>.items[<span class="self">self</span>.done_end..].rotate_left(<span class="self">self</span>.tail_start);
}
}
<span class="kw">let </span><span class="kw-2">mut </span>rest = JoinOnDrop {
items: <span class="kw-2">&amp;mut </span><span class="self">self</span>.data.as_slice_mut()[..<span class="self">self</span>.len <span class="kw">as </span>usize],
done_end: <span class="number">0</span>,
tail_start: <span class="number">0</span>,
};
<span class="kw">let </span>len = <span class="self">self</span>.len <span class="kw">as </span>usize;
<span class="kw">for </span>idx <span class="kw">in </span><span class="number">0</span>..len {
<span class="comment">// Loop start invariant: idx = rest.done_end + rest.tail_start
</span><span class="kw">if </span>!acceptable(<span class="kw-2">&amp;</span>rest.items[idx]) {
<span class="kw">let _ </span>= take(<span class="kw-2">&amp;mut </span>rest.items[idx]);
<span class="self">self</span>.len -= <span class="number">1</span>;
rest.tail_start += <span class="number">1</span>;
} <span class="kw">else </span>{
rest.items.swap(rest.done_end, idx);
rest.done_end += <span class="number">1</span>;
}
}
}
<span class="doccomment">/// Forces the length of the vector to `new_len`.
///
/// ## Panics
/// * If `new_len` is greater than the vec&#39;s capacity.
///
/// ## Safety
/// * This is a fully safe operation! The inactive memory already counts as
/// &quot;initialized&quot; by Rust&#39;s rules.
/// * Other than &quot;the memory is initialized&quot; there are no other guarantees
/// regarding what you find in the inactive portion of the vec.
</span><span class="attribute">#[inline(always)]
</span><span class="kw">pub fn </span>set_len(<span class="kw-2">&amp;mut </span><span class="self">self</span>, new_len: usize) {
<span class="kw">if </span>new_len &gt; A::CAPACITY {
<span class="comment">// Note(Lokathor): Technically we don&#39;t have to panic here, and we could
// just let some other call later on trigger a panic on accident when the
// length is wrong. However, it&#39;s a lot easier to catch bugs when things
// are more &quot;fail-fast&quot;.
</span><span class="macro">panic!</span>(
<span class="string">&quot;ArrayVec::set_len&gt; new length {} exceeds capacity {}&quot;</span>,
new_len,
A::CAPACITY
)
}
<span class="kw">let </span>new_len: u16 = new_len
.try_into()
.expect(<span class="string">&quot;ArrayVec::set_len&gt; new length is not in range 0..=u16::MAX&quot;</span>);
<span class="self">self</span>.len = new_len;
}
<span class="doccomment">/// Splits the collection at the point given.
///
/// * `[0, at)` stays in this vec
/// * `[at, len)` ends up in the new vec.
///
/// ## Panics
/// * if at &gt; len
///
/// ## Example
///
/// ```rust
/// # use tinyvec::*;
/// let mut av = array_vec!([i32; 4] =&gt; 1, 2, 3);
/// let av2 = av.split_off(1);
/// assert_eq!(&amp;av[..], [1]);
/// assert_eq!(&amp;av2[..], [2, 3]);
/// ```
</span><span class="attribute">#[inline]
</span><span class="kw">pub fn </span>split_off(<span class="kw-2">&amp;mut </span><span class="self">self</span>, at: usize) -&gt; <span class="self">Self </span>{
<span class="comment">// FIXME: should this just use drain into the output?
</span><span class="kw">if </span>at &gt; <span class="self">self</span>.len() {
<span class="macro">panic!</span>(
<span class="string">&quot;ArrayVec::split_off&gt; at value {} exceeds length of {}&quot;</span>,
at, <span class="self">self</span>.len
);
}
<span class="kw">let </span><span class="kw-2">mut </span>new = <span class="self">Self</span>::default();
<span class="kw">let </span>moves = <span class="kw-2">&amp;mut </span><span class="self">self</span>.as_mut_slice()[at..];
<span class="kw">let </span>split_len = moves.len();
<span class="kw">let </span>targets = <span class="kw-2">&amp;mut </span>new.data.as_slice_mut()[..split_len];
moves.swap_with_slice(targets);
<span class="comment">/* moves.len() &lt;= u16::MAX, so these are surely in u16 range */
</span>new.len = split_len <span class="kw">as </span>u16;
<span class="self">self</span>.len = at <span class="kw">as </span>u16;
new
}
<span class="doccomment">/// Creates a splicing iterator that removes the specified range in the
/// vector, yields the removed items, and replaces them with elements from
/// the provided iterator.
///
/// `splice` fuses the provided iterator, so elements after the first `None`
/// are ignored.
///
/// ## Panics
/// * If the start is greater than the end.
/// * If the end is past the edge of the vec.
/// * If the provided iterator panics.
/// * If the new length would overflow the capacity of the array. Because
/// `ArrayVecSplice` adds elements to this vec in its destructor when
/// necessary, this panic would occur when it is dropped.
///
/// ## Example
/// ```rust
/// use tinyvec::*;
/// let mut av = array_vec!([i32; 4] =&gt; 1, 2, 3);
/// let av2: ArrayVec&lt;[i32; 4]&gt; = av.splice(1.., 4..=6).collect();
/// assert_eq!(av.as_slice(), &amp;[1, 4, 5, 6][..]);
/// assert_eq!(av2.as_slice(), &amp;[2, 3][..]);
///
/// av.splice(.., None);
/// assert_eq!(av.as_slice(), &amp;[]);
/// ```
</span><span class="attribute">#[inline]
</span><span class="kw">pub fn </span>splice&lt;R, I&gt;(
<span class="kw-2">&amp;mut </span><span class="self">self</span>, range: R, replacement: I,
) -&gt; ArrayVecSplice&lt;<span class="lifetime">&#39;_</span>, A, core::iter::Fuse&lt;I::IntoIter&gt;&gt;
<span class="kw">where
</span>R: RangeBounds&lt;usize&gt;,
I: IntoIterator&lt;Item = A::Item&gt;,
{
<span class="kw">use </span>core::ops::Bound;
<span class="kw">let </span>start = <span class="kw">match </span>range.start_bound() {
Bound::Included(x) =&gt; <span class="kw-2">*</span>x,
Bound::Excluded(x) =&gt; x.saturating_add(<span class="number">1</span>),
Bound::Unbounded =&gt; <span class="number">0</span>,
};
<span class="kw">let </span>end = <span class="kw">match </span>range.end_bound() {
Bound::Included(x) =&gt; x.saturating_add(<span class="number">1</span>),
Bound::Excluded(x) =&gt; <span class="kw-2">*</span>x,
Bound::Unbounded =&gt; <span class="self">self</span>.len(),
};
<span class="macro">assert!</span>(
start &lt;= end,
<span class="string">&quot;ArrayVec::splice&gt; Illegal range, {} to {}&quot;</span>,
start,
end
);
<span class="macro">assert!</span>(
end &lt;= <span class="self">self</span>.len(),
<span class="string">&quot;ArrayVec::splice&gt; Range ends at {} but length is only {}!&quot;</span>,
end,
<span class="self">self</span>.len()
);
ArrayVecSplice {
removal_start: start,
removal_end: end,
parent: <span class="self">self</span>,
replacement: replacement.into_iter().fuse(),
}
}
<span class="doccomment">/// Remove an element, swapping the end of the vec into its place.
///
/// ## Panics
/// * If the index is out of bounds.
///
/// ## Example
/// ```rust
/// # use tinyvec::*;
/// let mut av = array_vec!([&amp;str; 4] =&gt; &quot;foo&quot;, &quot;bar&quot;, &quot;quack&quot;, &quot;zap&quot;);
///
/// assert_eq!(av.swap_remove(1), &quot;bar&quot;);
/// assert_eq!(&amp;av[..], [&quot;foo&quot;, &quot;zap&quot;, &quot;quack&quot;]);
///
/// assert_eq!(av.swap_remove(0), &quot;foo&quot;);
/// assert_eq!(&amp;av[..], [&quot;quack&quot;, &quot;zap&quot;]);
/// ```
</span><span class="attribute">#[inline]
</span><span class="kw">pub fn </span>swap_remove(<span class="kw-2">&amp;mut </span><span class="self">self</span>, index: usize) -&gt; A::Item {
<span class="macro">assert!</span>(
index &lt; <span class="self">self</span>.len(),
<span class="string">&quot;ArrayVec::swap_remove&gt; index {} is out of bounds {}&quot;</span>,
index,
<span class="self">self</span>.len
);
<span class="kw">if </span>index == <span class="self">self</span>.len() - <span class="number">1 </span>{
<span class="self">self</span>.pop().unwrap()
} <span class="kw">else </span>{
<span class="kw">let </span>i = <span class="self">self</span>.pop().unwrap();
replace(<span class="kw-2">&amp;mut </span><span class="self">self</span>[index], i)
}
}
<span class="doccomment">/// Reduces the vec&#39;s length to the given value.
///
/// If the vec is already shorter than the input, nothing happens.
</span><span class="attribute">#[inline]
</span><span class="kw">pub fn </span>truncate(<span class="kw-2">&amp;mut </span><span class="self">self</span>, new_len: usize) {
<span class="kw">if </span>new_len &gt;= <span class="self">self</span>.len <span class="kw">as </span>usize {
<span class="kw">return</span>;
}
<span class="kw">if </span>needs_drop::&lt;A::Item&gt;() {
<span class="kw">let </span>len = <span class="self">self</span>.len <span class="kw">as </span>usize;
<span class="self">self</span>.data.as_slice_mut()[new_len..len]
.iter_mut()
.map(take)
.for_each(drop);
}
<span class="comment">/* new_len is less than self.len */
</span><span class="self">self</span>.len = new_len <span class="kw">as </span>u16;
}
<span class="doccomment">/// Wraps an array, using the given length as the starting length.
///
/// If you want to use the whole length of the array, you can just use the
/// `From` impl.
///
/// ## Failure
///
/// If the given length is greater than the capacity of the array this will
/// error, and you&#39;ll get the array back in the `Err`.
</span><span class="attribute">#[inline]
</span><span class="kw">pub fn </span>try_from_array_len(data: A, len: usize) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, A&gt; {
<span class="comment">/* Note(Soveu): Should we allow A::CAPACITY &gt; u16::MAX for now? */
</span><span class="kw">if </span>len &lt;= A::CAPACITY {
<span class="prelude-val">Ok</span>(<span class="self">Self </span>{ data, len: len <span class="kw">as </span>u16 })
} <span class="kw">else </span>{
<span class="prelude-val">Err</span>(data)
}
}
}
<span class="kw">impl</span>&lt;A&gt; ArrayVec&lt;A&gt; {
<span class="doccomment">/// Wraps up an array as a new empty `ArrayVec`.
///
/// If you want to simply use the full array, use `from` instead.
///
/// ## Examples
///
/// This method in particular allows to create values for statics:
///
/// ```rust
/// # use tinyvec::ArrayVec;
/// static DATA: ArrayVec&lt;[u8; 5]&gt; = ArrayVec::from_array_empty([0; 5]);
/// assert_eq!(DATA.len(), 0);
/// ```
///
/// But of course it is just an normal empty `ArrayVec`:
///
/// ```rust
/// # use tinyvec::ArrayVec;
/// let mut data = ArrayVec::from_array_empty([1, 2, 3, 4]);
/// assert_eq!(&amp;data[..], &amp;[]);
/// data.push(42);
/// assert_eq!(&amp;data[..], &amp;[42]);
/// ```
</span><span class="attribute">#[inline]
#[must_use]
</span><span class="kw">pub const fn </span>from_array_empty(data: A) -&gt; <span class="self">Self </span>{
<span class="self">Self </span>{ data, len: <span class="number">0 </span>}
}
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;grab_spare_slice&quot;</span>)]
</span><span class="kw">impl</span>&lt;A: Array&gt; ArrayVec&lt;A&gt; {
<span class="doccomment">/// Obtain the shared slice of the array _after_ the active memory.
///
/// ## Example
/// ```rust
/// # use tinyvec::*;
/// let mut av = array_vec!([i32; 4]);
/// assert_eq!(av.grab_spare_slice().len(), 4);
/// av.push(10);
/// av.push(11);
/// av.push(12);
/// av.push(13);
/// assert_eq!(av.grab_spare_slice().len(), 0);
/// ```
</span><span class="attribute">#[inline(always)]
</span><span class="kw">pub fn </span>grab_spare_slice(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>[A::Item] {
<span class="kw-2">&amp;</span><span class="self">self</span>.data.as_slice()[<span class="self">self</span>.len <span class="kw">as </span>usize..]
}
<span class="doccomment">/// Obtain the mutable slice of the array _after_ the active memory.
///
/// ## Example
/// ```rust
/// # use tinyvec::*;
/// let mut av = array_vec!([i32; 4]);
/// assert_eq!(av.grab_spare_slice_mut().len(), 4);
/// av.push(10);
/// av.push(11);
/// assert_eq!(av.grab_spare_slice_mut().len(), 2);
/// ```
</span><span class="attribute">#[inline(always)]
</span><span class="kw">pub fn </span>grab_spare_slice_mut(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>[A::Item] {
<span class="kw-2">&amp;mut </span><span class="self">self</span>.data.as_slice_mut()[<span class="self">self</span>.len <span class="kw">as </span>usize..]
}
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;nightly_slice_partition_dedup&quot;</span>)]
</span><span class="kw">impl</span>&lt;A: Array&gt; ArrayVec&lt;A&gt; {
<span class="doccomment">/// De-duplicates the vec contents.
</span><span class="attribute">#[inline(always)]
</span><span class="kw">pub fn </span>dedup(<span class="kw-2">&amp;mut </span><span class="self">self</span>)
<span class="kw">where
</span>A::Item: PartialEq,
{
<span class="self">self</span>.dedup_by(|a, b| a == b)
}
<span class="doccomment">/// De-duplicates the vec according to the predicate given.
</span><span class="attribute">#[inline(always)]
</span><span class="kw">pub fn </span>dedup_by&lt;F&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, same_bucket: F)
<span class="kw">where
</span>F: FnMut(<span class="kw-2">&amp;mut </span>A::Item, <span class="kw-2">&amp;mut </span>A::Item) -&gt; bool,
{
<span class="kw">let </span>len = {
<span class="kw">let </span>(dedup, <span class="kw">_</span>) = <span class="self">self</span>.as_mut_slice().partition_dedup_by(same_bucket);
dedup.len()
};
<span class="self">self</span>.truncate(len);
}
<span class="doccomment">/// De-duplicates the vec according to the key selector given.
</span><span class="attribute">#[inline(always)]
</span><span class="kw">pub fn </span>dedup_by_key&lt;F, K&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, <span class="kw-2">mut </span>key: F)
<span class="kw">where
</span>F: FnMut(<span class="kw-2">&amp;mut </span>A::Item) -&gt; K,
K: PartialEq,
{
<span class="self">self</span>.dedup_by(|a, b| key(a) == key(b))
}
}
<span class="doccomment">/// Splicing iterator for `ArrayVec`
/// See [`ArrayVec::splice`](ArrayVec::&lt;A&gt;::splice)
</span><span class="kw">pub struct </span>ArrayVecSplice&lt;<span class="lifetime">&#39;p</span>, A: Array, I: Iterator&lt;Item = A::Item&gt;&gt; {
parent: <span class="kw-2">&amp;</span><span class="lifetime">&#39;p </span><span class="kw-2">mut </span>ArrayVec&lt;A&gt;,
removal_start: usize,
removal_end: usize,
replacement: I,
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;p</span>, A: Array, I: Iterator&lt;Item = A::Item&gt;&gt; Iterator
<span class="kw">for </span>ArrayVecSplice&lt;<span class="lifetime">&#39;p</span>, A, I&gt;
{
<span class="kw">type </span>Item = A::Item;
<span class="attribute">#[inline]
</span><span class="kw">fn </span>next(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;A::Item&gt; {
<span class="kw">if </span><span class="self">self</span>.removal_start &lt; <span class="self">self</span>.removal_end {
<span class="kw">match </span><span class="self">self</span>.replacement.next() {
<span class="prelude-val">Some</span>(replacement) =&gt; {
<span class="kw">let </span>removed = core::mem::replace(
<span class="kw-2">&amp;mut </span><span class="self">self</span>.parent[<span class="self">self</span>.removal_start],
replacement,
);
<span class="self">self</span>.removal_start += <span class="number">1</span>;
<span class="prelude-val">Some</span>(removed)
}
<span class="prelude-val">None </span>=&gt; {
<span class="kw">let </span>removed = <span class="self">self</span>.parent.remove(<span class="self">self</span>.removal_start);
<span class="self">self</span>.removal_end -= <span class="number">1</span>;
<span class="prelude-val">Some</span>(removed)
}
}
} <span class="kw">else </span>{
<span class="prelude-val">None
</span>}
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>size_hint(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; (usize, <span class="prelude-ty">Option</span>&lt;usize&gt;) {
<span class="kw">let </span>len = <span class="self">self</span>.len();
(len, <span class="prelude-val">Some</span>(len))
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;p</span>, A, I&gt; ExactSizeIterator <span class="kw">for </span>ArrayVecSplice&lt;<span class="lifetime">&#39;p</span>, A, I&gt;
<span class="kw">where
</span>A: Array,
I: Iterator&lt;Item = A::Item&gt;,
{
<span class="attribute">#[inline]
</span><span class="kw">fn </span>len(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
<span class="self">self</span>.removal_end - <span class="self">self</span>.removal_start
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;p</span>, A, I&gt; FusedIterator <span class="kw">for </span>ArrayVecSplice&lt;<span class="lifetime">&#39;p</span>, A, I&gt;
<span class="kw">where
</span>A: Array,
I: Iterator&lt;Item = A::Item&gt;,
{
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;p</span>, A, I&gt; DoubleEndedIterator <span class="kw">for </span>ArrayVecSplice&lt;<span class="lifetime">&#39;p</span>, A, I&gt;
<span class="kw">where
</span>A: Array,
I: Iterator&lt;Item = A::Item&gt; + DoubleEndedIterator,
{
<span class="attribute">#[inline]
</span><span class="kw">fn </span>next_back(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;A::Item&gt; {
<span class="kw">if </span><span class="self">self</span>.removal_start &lt; <span class="self">self</span>.removal_end {
<span class="kw">match </span><span class="self">self</span>.replacement.next_back() {
<span class="prelude-val">Some</span>(replacement) =&gt; {
<span class="kw">let </span>removed = core::mem::replace(
<span class="kw-2">&amp;mut </span><span class="self">self</span>.parent[<span class="self">self</span>.removal_end - <span class="number">1</span>],
replacement,
);
<span class="self">self</span>.removal_end -= <span class="number">1</span>;
<span class="prelude-val">Some</span>(removed)
}
<span class="prelude-val">None </span>=&gt; {
<span class="kw">let </span>removed = <span class="self">self</span>.parent.remove(<span class="self">self</span>.removal_end - <span class="number">1</span>);
<span class="self">self</span>.removal_end -= <span class="number">1</span>;
<span class="prelude-val">Some</span>(removed)
}
}
} <span class="kw">else </span>{
<span class="prelude-val">None
</span>}
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;p</span>, A: Array, I: Iterator&lt;Item = A::Item&gt;&gt; Drop
<span class="kw">for </span>ArrayVecSplice&lt;<span class="lifetime">&#39;p</span>, A, I&gt;
{
<span class="kw">fn </span>drop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
<span class="kw">for _ in </span><span class="self">self</span>.by_ref() {}
<span class="comment">// FIXME: reserve lower bound of size_hint
</span><span class="kw">for </span>replacement <span class="kw">in </span><span class="self">self</span>.replacement.by_ref() {
<span class="self">self</span>.parent.insert(<span class="self">self</span>.removal_end, replacement);
<span class="self">self</span>.removal_end += <span class="number">1</span>;
}
}
}
<span class="kw">impl</span>&lt;A: Array&gt; AsMut&lt;[A::Item]&gt; <span class="kw">for </span>ArrayVec&lt;A&gt; {
<span class="attribute">#[inline(always)]
#[must_use]
</span><span class="kw">fn </span>as_mut(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>[A::Item] {
<span class="kw-2">&amp;mut *</span><span class="self">self
</span>}
}
<span class="kw">impl</span>&lt;A: Array&gt; AsRef&lt;[A::Item]&gt; <span class="kw">for </span>ArrayVec&lt;A&gt; {
<span class="attribute">#[inline(always)]
#[must_use]
</span><span class="kw">fn </span>as_ref(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>[A::Item] {
<span class="kw-2">&amp;*</span><span class="self">self
</span>}
}
<span class="kw">impl</span>&lt;A: Array&gt; Borrow&lt;[A::Item]&gt; <span class="kw">for </span>ArrayVec&lt;A&gt; {
<span class="attribute">#[inline(always)]
#[must_use]
</span><span class="kw">fn </span>borrow(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>[A::Item] {
<span class="kw-2">&amp;*</span><span class="self">self
</span>}
}
<span class="kw">impl</span>&lt;A: Array&gt; BorrowMut&lt;[A::Item]&gt; <span class="kw">for </span>ArrayVec&lt;A&gt; {
<span class="attribute">#[inline(always)]
#[must_use]
</span><span class="kw">fn </span>borrow_mut(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>[A::Item] {
<span class="kw-2">&amp;mut *</span><span class="self">self
</span>}
}
<span class="kw">impl</span>&lt;A: Array&gt; Extend&lt;A::Item&gt; <span class="kw">for </span>ArrayVec&lt;A&gt; {
<span class="attribute">#[inline]
</span><span class="kw">fn </span>extend&lt;T: IntoIterator&lt;Item = A::Item&gt;&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, iter: T) {
<span class="kw">for </span>t <span class="kw">in </span>iter {
<span class="self">self</span>.push(t)
}
}
}
<span class="kw">impl</span>&lt;A: Array&gt; From&lt;A&gt; <span class="kw">for </span>ArrayVec&lt;A&gt; {
<span class="attribute">#[inline(always)]
#[must_use]
</span><span class="doccomment">/// The output has a length equal to the full array.
///
/// If you want to select a length, use
/// [`from_array_len`](ArrayVec::from_array_len)
</span><span class="kw">fn </span>from(data: A) -&gt; <span class="self">Self </span>{
<span class="kw">let </span>len: u16 = data
.as_slice()
.len()
.try_into()
.expect(<span class="string">&quot;ArrayVec::from&gt; length must be in range 0..=u16::MAX&quot;</span>);
<span class="self">Self </span>{ len, data }
}
}
<span class="doccomment">/// The error type returned when a conversion from a slice to an [`ArrayVec`]
/// fails.
</span><span class="attribute">#[derive(Debug, Copy, Clone)]
</span><span class="kw">pub struct </span>TryFromSliceError(());
<span class="kw">impl </span>core::fmt::Display <span class="kw">for </span>TryFromSliceError {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; core::fmt::Result {
f.write_str(<span class="string">&quot;could not convert slice to ArrayVec&quot;</span>)
}
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
</span><span class="kw">impl </span>std::error::Error <span class="kw">for </span>TryFromSliceError {}
<span class="kw">impl</span>&lt;T, A&gt; TryFrom&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;_ </span>[T]&gt; <span class="kw">for </span>ArrayVec&lt;A&gt;
<span class="kw">where
</span>T: Clone + Default,
A: Array&lt;Item = T&gt;,
{
<span class="kw">type </span>Error = TryFromSliceError;
<span class="attribute">#[inline]
#[must_use]
</span><span class="doccomment">/// The output has a length equal to that of the slice, with the same capacity
/// as `A`.
</span><span class="kw">fn </span>try_from(slice: <span class="kw-2">&amp;</span>[T]) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, <span class="self">Self</span>::Error&gt; {
<span class="kw">if </span>slice.len() &gt; A::CAPACITY {
<span class="prelude-val">Err</span>(TryFromSliceError(()))
} <span class="kw">else </span>{
<span class="kw">let </span><span class="kw-2">mut </span>arr = ArrayVec::new();
<span class="comment">// We do not use ArrayVec::extend_from_slice, because it looks like LLVM
// fails to deduplicate all the length-checking logic between the
// above if and the contents of that method, thus producing much
// slower code. Unlike many of the other optimizations in this
// crate, this one is worth keeping an eye on. I see no reason, for
// any element type, that these should produce different code. But
// they do. (rustc 1.51.0)
</span>arr.set_len(slice.len());
arr.as_mut_slice().clone_from_slice(slice);
<span class="prelude-val">Ok</span>(arr)
}
}
}
<span class="kw">impl</span>&lt;A: Array&gt; FromIterator&lt;A::Item&gt; <span class="kw">for </span>ArrayVec&lt;A&gt; {
<span class="attribute">#[inline]
#[must_use]
</span><span class="kw">fn </span>from_iter&lt;T: IntoIterator&lt;Item = A::Item&gt;&gt;(iter: T) -&gt; <span class="self">Self </span>{
<span class="kw">let </span><span class="kw-2">mut </span>av = <span class="self">Self</span>::default();
<span class="kw">for </span>i <span class="kw">in </span>iter {
av.push(i)
}
av
}
}
<span class="doccomment">/// Iterator for consuming an `ArrayVec` and returning owned elements.
</span><span class="kw">pub struct </span>ArrayVecIterator&lt;A: Array&gt; {
base: u16,
tail: u16,
data: A,
}
<span class="kw">impl</span>&lt;A: Array&gt; ArrayVecIterator&lt;A&gt; {
<span class="doccomment">/// Returns the remaining items of this iterator as a slice.
</span><span class="attribute">#[inline]
#[must_use]
</span><span class="kw">pub fn </span>as_slice(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>[A::Item] {
<span class="kw-2">&amp;</span><span class="self">self</span>.data.as_slice()[<span class="self">self</span>.base <span class="kw">as </span>usize..<span class="self">self</span>.tail <span class="kw">as </span>usize]
}
}
<span class="kw">impl</span>&lt;A: Array&gt; FusedIterator <span class="kw">for </span>ArrayVecIterator&lt;A&gt; {}
<span class="kw">impl</span>&lt;A: Array&gt; Iterator <span class="kw">for </span>ArrayVecIterator&lt;A&gt; {
<span class="kw">type </span>Item = A::Item;
<span class="attribute">#[inline]
</span><span class="kw">fn </span>next(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="self">Self</span>::Item&gt; {
<span class="kw">let </span>slice =
<span class="kw-2">&amp;mut </span><span class="self">self</span>.data.as_slice_mut()[<span class="self">self</span>.base <span class="kw">as </span>usize..<span class="self">self</span>.tail <span class="kw">as </span>usize];
<span class="kw">let </span>itemref = slice.first_mut()<span class="question-mark">?</span>;
<span class="self">self</span>.base += <span class="number">1</span>;
<span class="kw">return </span><span class="prelude-val">Some</span>(take(itemref));
}
<span class="attribute">#[inline(always)]
#[must_use]
</span><span class="kw">fn </span>size_hint(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; (usize, <span class="prelude-ty">Option</span>&lt;usize&gt;) {
<span class="kw">let </span>s = <span class="self">self</span>.tail - <span class="self">self</span>.base;
<span class="kw">let </span>s = s <span class="kw">as </span>usize;
(s, <span class="prelude-val">Some</span>(s))
}
<span class="attribute">#[inline(always)]
</span><span class="kw">fn </span>count(<span class="self">self</span>) -&gt; usize {
<span class="self">self</span>.size_hint().<span class="number">0
</span>}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>last(<span class="kw-2">mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="self">Self</span>::Item&gt; {
<span class="self">self</span>.next_back()
}
<span class="attribute">#[inline]
</span><span class="kw">fn </span>nth(<span class="kw-2">&amp;mut </span><span class="self">self</span>, n: usize) -&gt; <span class="prelude-ty">Option</span>&lt;A::Item&gt; {
<span class="kw">let </span>slice = <span class="kw-2">&amp;mut </span><span class="self">self</span>.data.as_slice_mut();
<span class="kw">let </span>slice = <span class="kw-2">&amp;mut </span>slice[<span class="self">self</span>.base <span class="kw">as </span>usize..<span class="self">self</span>.tail <span class="kw">as </span>usize];
<span class="kw">if let </span><span class="prelude-val">Some</span>(x) = slice.get_mut(n) {
<span class="comment">/* n is in range [0 .. self.tail - self.base) so in u16 range */
</span><span class="self">self</span>.base += n <span class="kw">as </span>u16 + <span class="number">1</span>;
<span class="kw">return </span><span class="prelude-val">Some</span>(take(x));
}
<span class="self">self</span>.base = <span class="self">self</span>.tail;
<span class="kw">return </span><span class="prelude-val">None</span>;
}
}
<span class="kw">impl</span>&lt;A: Array&gt; DoubleEndedIterator <span class="kw">for </span>ArrayVecIterator&lt;A&gt; {
<span class="attribute">#[inline]
</span><span class="kw">fn </span>next_back(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="self">Self</span>::Item&gt; {
<span class="kw">let </span>slice =
<span class="kw-2">&amp;mut </span><span class="self">self</span>.data.as_slice_mut()[<span class="self">self</span>.base <span class="kw">as </span>usize..<span class="self">self</span>.tail <span class="kw">as </span>usize];
<span class="kw">let </span>item = slice.last_mut()<span class="question-mark">?</span>;
<span class="self">self</span>.tail -= <span class="number">1</span>;
<span class="kw">return </span><span class="prelude-val">Some</span>(take(item));
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;rustc_1_40&quot;</span>)]
#[inline]
</span><span class="kw">fn </span>nth_back(<span class="kw-2">&amp;mut </span><span class="self">self</span>, n: usize) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="self">Self</span>::Item&gt; {
<span class="kw">let </span>base = <span class="self">self</span>.base <span class="kw">as </span>usize;
<span class="kw">let </span>tail = <span class="self">self</span>.tail <span class="kw">as </span>usize;
<span class="kw">let </span>slice = <span class="kw-2">&amp;mut </span><span class="self">self</span>.data.as_slice_mut()[base..tail];
<span class="kw">let </span>n = n.saturating_add(<span class="number">1</span>);
<span class="kw">if let </span><span class="prelude-val">Some</span>(n) = slice.len().checked_sub(n) {
<span class="kw">let </span>item = <span class="kw-2">&amp;mut </span>slice[n];
<span class="comment">/* n is in [0..self.tail - self.base] range, so in u16 range */
</span><span class="self">self</span>.tail = <span class="self">self</span>.base + n <span class="kw">as </span>u16;
<span class="kw">return </span><span class="prelude-val">Some</span>(take(item));
}
<span class="self">self</span>.tail = <span class="self">self</span>.base;
<span class="kw">return </span><span class="prelude-val">None</span>;
}
}
<span class="kw">impl</span>&lt;A: Array&gt; Debug <span class="kw">for </span>ArrayVecIterator&lt;A&gt;
<span class="kw">where
</span>A::Item: Debug,
{
<span class="attribute">#[allow(clippy::missing_inline_in_public_items)]
</span><span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; core::fmt::Result {
f.debug_tuple(<span class="string">&quot;ArrayVecIterator&quot;</span>).field(<span class="kw-2">&amp;</span><span class="self">self</span>.as_slice()).finish()
}
}
<span class="kw">impl</span>&lt;A: Array&gt; IntoIterator <span class="kw">for </span>ArrayVec&lt;A&gt; {
<span class="kw">type </span>Item = A::Item;
<span class="kw">type </span>IntoIter = ArrayVecIterator&lt;A&gt;;
<span class="attribute">#[inline(always)]
#[must_use]
</span><span class="kw">fn </span>into_iter(<span class="self">self</span>) -&gt; <span class="self">Self</span>::IntoIter {
ArrayVecIterator { base: <span class="number">0</span>, tail: <span class="self">self</span>.len, data: <span class="self">self</span>.data }
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, A: Array&gt; IntoIterator <span class="kw">for </span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span>ArrayVec&lt;A&gt; {
<span class="kw">type </span>Item = <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span>A::Item;
<span class="kw">type </span>IntoIter = core::slice::IterMut&lt;<span class="lifetime">&#39;a</span>, A::Item&gt;;
<span class="attribute">#[inline(always)]
#[must_use]
</span><span class="kw">fn </span>into_iter(<span class="self">self</span>) -&gt; <span class="self">Self</span>::IntoIter {
<span class="self">self</span>.iter_mut()
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, A: Array&gt; IntoIterator <span class="kw">for </span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>ArrayVec&lt;A&gt; {
<span class="kw">type </span>Item = <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>A::Item;
<span class="kw">type </span>IntoIter = core::slice::Iter&lt;<span class="lifetime">&#39;a</span>, A::Item&gt;;
<span class="attribute">#[inline(always)]
#[must_use]
</span><span class="kw">fn </span>into_iter(<span class="self">self</span>) -&gt; <span class="self">Self</span>::IntoIter {
<span class="self">self</span>.iter()
}
}
<span class="kw">impl</span>&lt;A: Array&gt; PartialEq <span class="kw">for </span>ArrayVec&lt;A&gt;
<span class="kw">where
</span>A::Item: PartialEq,
{
<span class="attribute">#[inline]
#[must_use]
</span><span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span><span class="self">Self</span>) -&gt; bool {
<span class="self">self</span>.as_slice().eq(other.as_slice())
}
}
<span class="kw">impl</span>&lt;A: Array&gt; Eq <span class="kw">for </span>ArrayVec&lt;A&gt; <span class="kw">where </span>A::Item: Eq {}
<span class="kw">impl</span>&lt;A: Array&gt; PartialOrd <span class="kw">for </span>ArrayVec&lt;A&gt;
<span class="kw">where
</span>A::Item: PartialOrd,
{
<span class="attribute">#[inline]
#[must_use]
</span><span class="kw">fn </span>partial_cmp(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span><span class="self">Self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;core::cmp::Ordering&gt; {
<span class="self">self</span>.as_slice().partial_cmp(other.as_slice())
}
}
<span class="kw">impl</span>&lt;A: Array&gt; Ord <span class="kw">for </span>ArrayVec&lt;A&gt;
<span class="kw">where
</span>A::Item: Ord,
{
<span class="attribute">#[inline]
#[must_use]
</span><span class="kw">fn </span>cmp(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span><span class="self">Self</span>) -&gt; core::cmp::Ordering {
<span class="self">self</span>.as_slice().cmp(other.as_slice())
}
}
<span class="kw">impl</span>&lt;A: Array&gt; PartialEq&lt;<span class="kw-2">&amp;</span>A&gt; <span class="kw">for </span>ArrayVec&lt;A&gt;
<span class="kw">where
</span>A::Item: PartialEq,
{
<span class="attribute">#[inline]
#[must_use]
</span><span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: &amp;&amp;A) -&gt; bool {
<span class="self">self</span>.as_slice().eq(other.as_slice())
}
}
<span class="kw">impl</span>&lt;A: Array&gt; PartialEq&lt;<span class="kw-2">&amp;</span>[A::Item]&gt; <span class="kw">for </span>ArrayVec&lt;A&gt;
<span class="kw">where
</span>A::Item: PartialEq,
{
<span class="attribute">#[inline]
#[must_use]
</span><span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: &amp;&amp;[A::Item]) -&gt; bool {
<span class="self">self</span>.as_slice().eq(<span class="kw-2">*</span>other)
}
}
<span class="kw">impl</span>&lt;A: Array&gt; Hash <span class="kw">for </span>ArrayVec&lt;A&gt;
<span class="kw">where
</span>A::Item: Hash,
{
<span class="attribute">#[inline]
</span><span class="kw">fn </span>hash&lt;H: Hasher&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, state: <span class="kw-2">&amp;mut </span>H) {
<span class="self">self</span>.as_slice().hash(state)
}
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;experimental_write_impl&quot;</span>)]
</span><span class="kw">impl</span>&lt;A: Array&lt;Item = u8&gt;&gt; core::fmt::Write <span class="kw">for </span>ArrayVec&lt;A&gt; {
<span class="kw">fn </span>write_str(<span class="kw-2">&amp;mut </span><span class="self">self</span>, s: <span class="kw-2">&amp;</span>str) -&gt; core::fmt::Result {
<span class="kw">let </span>my_len = <span class="self">self</span>.len();
<span class="kw">let </span>str_len = s.as_bytes().len();
<span class="kw">if </span>my_len + str_len &lt;= A::CAPACITY {
<span class="kw">let </span>remainder = <span class="kw-2">&amp;mut </span><span class="self">self</span>.data.as_slice_mut()[my_len..];
<span class="kw">let </span>target = <span class="kw-2">&amp;mut </span>remainder[..str_len];
target.copy_from_slice(s.as_bytes());
<span class="prelude-val">Ok</span>(())
} <span class="kw">else </span>{
<span class="prelude-val">Err</span>(core::fmt::Error)
}
}
}
<span class="comment">// // // // // // // //
// Formatting impls
// // // // // // // //
</span><span class="kw">impl</span>&lt;A: Array&gt; Binary <span class="kw">for </span>ArrayVec&lt;A&gt;
<span class="kw">where
</span>A::Item: Binary,
{
<span class="attribute">#[allow(clippy::missing_inline_in_public_items)]
</span><span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>Formatter) -&gt; core::fmt::Result {
<span class="macro">write!</span>(f, <span class="string">&quot;[&quot;</span>)<span class="question-mark">?</span>;
<span class="kw">if </span>f.alternate() {
<span class="macro">write!</span>(f, <span class="string">&quot;\n &quot;</span>)<span class="question-mark">?</span>;
}
<span class="kw">for </span>(i, elem) <span class="kw">in </span><span class="self">self</span>.iter().enumerate() {
<span class="kw">if </span>i &gt; <span class="number">0 </span>{
<span class="macro">write!</span>(f, <span class="string">&quot;,{}&quot;</span>, <span class="kw">if </span>f.alternate() { <span class="string">&quot;\n &quot; </span>} <span class="kw">else </span>{ <span class="string">&quot; &quot; </span>})<span class="question-mark">?</span>;
}
Binary::fmt(elem, f)<span class="question-mark">?</span>;
}
<span class="kw">if </span>f.alternate() {
<span class="macro">write!</span>(f, <span class="string">&quot;,\n&quot;</span>)<span class="question-mark">?</span>;
}
<span class="macro">write!</span>(f, <span class="string">&quot;]&quot;</span>)
}
}
<span class="kw">impl</span>&lt;A: Array&gt; Debug <span class="kw">for </span>ArrayVec&lt;A&gt;
<span class="kw">where
</span>A::Item: Debug,
{
<span class="attribute">#[allow(clippy::missing_inline_in_public_items)]
</span><span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>Formatter) -&gt; core::fmt::Result {
<span class="macro">write!</span>(f, <span class="string">&quot;[&quot;</span>)<span class="question-mark">?</span>;
<span class="kw">if </span>f.alternate() {
<span class="macro">write!</span>(f, <span class="string">&quot;\n &quot;</span>)<span class="question-mark">?</span>;
}
<span class="kw">for </span>(i, elem) <span class="kw">in </span><span class="self">self</span>.iter().enumerate() {
<span class="kw">if </span>i &gt; <span class="number">0 </span>{
<span class="macro">write!</span>(f, <span class="string">&quot;,{}&quot;</span>, <span class="kw">if </span>f.alternate() { <span class="string">&quot;\n &quot; </span>} <span class="kw">else </span>{ <span class="string">&quot; &quot; </span>})<span class="question-mark">?</span>;
}
Debug::fmt(elem, f)<span class="question-mark">?</span>;
}
<span class="kw">if </span>f.alternate() {
<span class="macro">write!</span>(f, <span class="string">&quot;,\n&quot;</span>)<span class="question-mark">?</span>;
}
<span class="macro">write!</span>(f, <span class="string">&quot;]&quot;</span>)
}
}
<span class="kw">impl</span>&lt;A: Array&gt; Display <span class="kw">for </span>ArrayVec&lt;A&gt;
<span class="kw">where
</span>A::Item: Display,
{
<span class="attribute">#[allow(clippy::missing_inline_in_public_items)]
</span><span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>Formatter) -&gt; core::fmt::Result {
<span class="macro">write!</span>(f, <span class="string">&quot;[&quot;</span>)<span class="question-mark">?</span>;
<span class="kw">if </span>f.alternate() {
<span class="macro">write!</span>(f, <span class="string">&quot;\n &quot;</span>)<span class="question-mark">?</span>;
}
<span class="kw">for </span>(i, elem) <span class="kw">in </span><span class="self">self</span>.iter().enumerate() {
<span class="kw">if </span>i &gt; <span class="number">0 </span>{
<span class="macro">write!</span>(f, <span class="string">&quot;,{}&quot;</span>, <span class="kw">if </span>f.alternate() { <span class="string">&quot;\n &quot; </span>} <span class="kw">else </span>{ <span class="string">&quot; &quot; </span>})<span class="question-mark">?</span>;
}
Display::fmt(elem, f)<span class="question-mark">?</span>;
}
<span class="kw">if </span>f.alternate() {
<span class="macro">write!</span>(f, <span class="string">&quot;,\n&quot;</span>)<span class="question-mark">?</span>;
}
<span class="macro">write!</span>(f, <span class="string">&quot;]&quot;</span>)
}
}
<span class="kw">impl</span>&lt;A: Array&gt; LowerExp <span class="kw">for </span>ArrayVec&lt;A&gt;
<span class="kw">where
</span>A::Item: LowerExp,
{
<span class="attribute">#[allow(clippy::missing_inline_in_public_items)]
</span><span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>Formatter) -&gt; core::fmt::Result {
<span class="macro">write!</span>(f, <span class="string">&quot;[&quot;</span>)<span class="question-mark">?</span>;
<span class="kw">if </span>f.alternate() {
<span class="macro">write!</span>(f, <span class="string">&quot;\n &quot;</span>)<span class="question-mark">?</span>;
}
<span class="kw">for </span>(i, elem) <span class="kw">in </span><span class="self">self</span>.iter().enumerate() {
<span class="kw">if </span>i &gt; <span class="number">0 </span>{
<span class="macro">write!</span>(f, <span class="string">&quot;,{}&quot;</span>, <span class="kw">if </span>f.alternate() { <span class="string">&quot;\n &quot; </span>} <span class="kw">else </span>{ <span class="string">&quot; &quot; </span>})<span class="question-mark">?</span>;
}
LowerExp::fmt(elem, f)<span class="question-mark">?</span>;
}
<span class="kw">if </span>f.alternate() {
<span class="macro">write!</span>(f, <span class="string">&quot;,\n&quot;</span>)<span class="question-mark">?</span>;
}
<span class="macro">write!</span>(f, <span class="string">&quot;]&quot;</span>)
}
}
<span class="kw">impl</span>&lt;A: Array&gt; LowerHex <span class="kw">for </span>ArrayVec&lt;A&gt;
<span class="kw">where
</span>A::Item: LowerHex,
{
<span class="attribute">#[allow(clippy::missing_inline_in_public_items)]
</span><span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>Formatter) -&gt; core::fmt::Result {
<span class="macro">write!</span>(f, <span class="string">&quot;[&quot;</span>)<span class="question-mark">?</span>;
<span class="kw">if </span>f.alternate() {
<span class="macro">write!</span>(f, <span class="string">&quot;\n &quot;</span>)<span class="question-mark">?</span>;
}
<span class="kw">for </span>(i, elem) <span class="kw">in </span><span class="self">self</span>.iter().enumerate() {
<span class="kw">if </span>i &gt; <span class="number">0 </span>{
<span class="macro">write!</span>(f, <span class="string">&quot;,{}&quot;</span>, <span class="kw">if </span>f.alternate() { <span class="string">&quot;\n &quot; </span>} <span class="kw">else </span>{ <span class="string">&quot; &quot; </span>})<span class="question-mark">?</span>;
}
LowerHex::fmt(elem, f)<span class="question-mark">?</span>;
}
<span class="kw">if </span>f.alternate() {
<span class="macro">write!</span>(f, <span class="string">&quot;,\n&quot;</span>)<span class="question-mark">?</span>;
}
<span class="macro">write!</span>(f, <span class="string">&quot;]&quot;</span>)
}
}
<span class="kw">impl</span>&lt;A: Array&gt; Octal <span class="kw">for </span>ArrayVec&lt;A&gt;
<span class="kw">where
</span>A::Item: Octal,
{
<span class="attribute">#[allow(clippy::missing_inline_in_public_items)]
</span><span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>Formatter) -&gt; core::fmt::Result {
<span class="macro">write!</span>(f, <span class="string">&quot;[&quot;</span>)<span class="question-mark">?</span>;
<span class="kw">if </span>f.alternate() {
<span class="macro">write!</span>(f, <span class="string">&quot;\n &quot;</span>)<span class="question-mark">?</span>;
}
<span class="kw">for </span>(i, elem) <span class="kw">in </span><span class="self">self</span>.iter().enumerate() {
<span class="kw">if </span>i &gt; <span class="number">0 </span>{
<span class="macro">write!</span>(f, <span class="string">&quot;,{}&quot;</span>, <span class="kw">if </span>f.alternate() { <span class="string">&quot;\n &quot; </span>} <span class="kw">else </span>{ <span class="string">&quot; &quot; </span>})<span class="question-mark">?</span>;
}
Octal::fmt(elem, f)<span class="question-mark">?</span>;
}
<span class="kw">if </span>f.alternate() {
<span class="macro">write!</span>(f, <span class="string">&quot;,\n&quot;</span>)<span class="question-mark">?</span>;
}
<span class="macro">write!</span>(f, <span class="string">&quot;]&quot;</span>)
}
}
<span class="kw">impl</span>&lt;A: Array&gt; Pointer <span class="kw">for </span>ArrayVec&lt;A&gt;
<span class="kw">where
</span>A::Item: Pointer,
{
<span class="attribute">#[allow(clippy::missing_inline_in_public_items)]
</span><span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>Formatter) -&gt; core::fmt::Result {
<span class="macro">write!</span>(f, <span class="string">&quot;[&quot;</span>)<span class="question-mark">?</span>;
<span class="kw">if </span>f.alternate() {
<span class="macro">write!</span>(f, <span class="string">&quot;\n &quot;</span>)<span class="question-mark">?</span>;
}
<span class="kw">for </span>(i, elem) <span class="kw">in </span><span class="self">self</span>.iter().enumerate() {
<span class="kw">if </span>i &gt; <span class="number">0 </span>{
<span class="macro">write!</span>(f, <span class="string">&quot;,{}&quot;</span>, <span class="kw">if </span>f.alternate() { <span class="string">&quot;\n &quot; </span>} <span class="kw">else </span>{ <span class="string">&quot; &quot; </span>})<span class="question-mark">?</span>;
}
Pointer::fmt(elem, f)<span class="question-mark">?</span>;
}
<span class="kw">if </span>f.alternate() {
<span class="macro">write!</span>(f, <span class="string">&quot;,\n&quot;</span>)<span class="question-mark">?</span>;
}
<span class="macro">write!</span>(f, <span class="string">&quot;]&quot;</span>)
}
}
<span class="kw">impl</span>&lt;A: Array&gt; UpperExp <span class="kw">for </span>ArrayVec&lt;A&gt;
<span class="kw">where
</span>A::Item: UpperExp,
{
<span class="attribute">#[allow(clippy::missing_inline_in_public_items)]
</span><span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>Formatter) -&gt; core::fmt::Result {
<span class="macro">write!</span>(f, <span class="string">&quot;[&quot;</span>)<span class="question-mark">?</span>;
<span class="kw">if </span>f.alternate() {
<span class="macro">write!</span>(f, <span class="string">&quot;\n &quot;</span>)<span class="question-mark">?</span>;
}
<span class="kw">for </span>(i, elem) <span class="kw">in </span><span class="self">self</span>.iter().enumerate() {
<span class="kw">if </span>i &gt; <span class="number">0 </span>{
<span class="macro">write!</span>(f, <span class="string">&quot;,{}&quot;</span>, <span class="kw">if </span>f.alternate() { <span class="string">&quot;\n &quot; </span>} <span class="kw">else </span>{ <span class="string">&quot; &quot; </span>})<span class="question-mark">?</span>;
}
UpperExp::fmt(elem, f)<span class="question-mark">?</span>;
}
<span class="kw">if </span>f.alternate() {
<span class="macro">write!</span>(f, <span class="string">&quot;,\n&quot;</span>)<span class="question-mark">?</span>;
}
<span class="macro">write!</span>(f, <span class="string">&quot;]&quot;</span>)
}
}
<span class="kw">impl</span>&lt;A: Array&gt; UpperHex <span class="kw">for </span>ArrayVec&lt;A&gt;
<span class="kw">where
</span>A::Item: UpperHex,
{
<span class="attribute">#[allow(clippy::missing_inline_in_public_items)]
</span><span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>Formatter) -&gt; core::fmt::Result {
<span class="macro">write!</span>(f, <span class="string">&quot;[&quot;</span>)<span class="question-mark">?</span>;
<span class="kw">if </span>f.alternate() {
<span class="macro">write!</span>(f, <span class="string">&quot;\n &quot;</span>)<span class="question-mark">?</span>;
}
<span class="kw">for </span>(i, elem) <span class="kw">in </span><span class="self">self</span>.iter().enumerate() {
<span class="kw">if </span>i &gt; <span class="number">0 </span>{
<span class="macro">write!</span>(f, <span class="string">&quot;,{}&quot;</span>, <span class="kw">if </span>f.alternate() { <span class="string">&quot;\n &quot; </span>} <span class="kw">else </span>{ <span class="string">&quot; &quot; </span>})<span class="question-mark">?</span>;
}
UpperHex::fmt(elem, f)<span class="question-mark">?</span>;
}
<span class="kw">if </span>f.alternate() {
<span class="macro">write!</span>(f, <span class="string">&quot;,\n&quot;</span>)<span class="question-mark">?</span>;
}
<span class="macro">write!</span>(f, <span class="string">&quot;]&quot;</span>)
}
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
</span><span class="kw">use </span>alloc::vec::Vec;
<span class="attribute">#[cfg(all(feature = <span class="string">&quot;alloc&quot;</span>, feature = <span class="string">&quot;rustc_1_57&quot;</span>))]
</span><span class="kw">use </span>alloc::collections::TryReserveError;
<span class="attribute">#[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
</span><span class="kw">impl</span>&lt;A: Array&gt; ArrayVec&lt;A&gt; {
<span class="doccomment">/// Drains all elements to a Vec, but reserves additional space
/// ```
/// # use tinyvec::*;
/// let mut av = array_vec!([i32; 7] =&gt; 1, 2, 3);
/// let v = av.drain_to_vec_and_reserve(10);
/// assert_eq!(v, &amp;[1, 2, 3]);
/// assert_eq!(v.capacity(), 13);
/// ```
</span><span class="kw">pub fn </span>drain_to_vec_and_reserve(<span class="kw-2">&amp;mut </span><span class="self">self</span>, n: usize) -&gt; Vec&lt;A::Item&gt; {
<span class="kw">let </span>cap = n + <span class="self">self</span>.len();
<span class="kw">let </span><span class="kw-2">mut </span>v = Vec::with_capacity(cap);
<span class="kw">let </span>iter = <span class="self">self</span>.iter_mut().map(take);
v.extend(iter);
<span class="self">self</span>.set_len(<span class="number">0</span>);
<span class="kw">return </span>v;
}
<span class="doccomment">/// Tries to drain all elements to a Vec, but reserves additional space.
///
/// # Errors
///
/// If the allocator reports a failure, then an error is returned.
///
/// ```
/// # use tinyvec::*;
/// let mut av = array_vec!([i32; 7] =&gt; 1, 2, 3);
/// let v = av.try_drain_to_vec_and_reserve(10);
/// assert!(matches!(v, Ok(_)));
/// let v = v.unwrap();
/// assert_eq!(v, &amp;[1, 2, 3]);
/// assert_eq!(v.capacity(), 13);
/// ```
</span><span class="attribute">#[cfg(feature = <span class="string">&quot;rustc_1_57&quot;</span>)]
</span><span class="kw">pub fn </span>try_drain_to_vec_and_reserve(
<span class="kw-2">&amp;mut </span><span class="self">self</span>, n: usize,
) -&gt; <span class="prelude-ty">Result</span>&lt;Vec&lt;A::Item&gt;, TryReserveError&gt; {
<span class="kw">let </span>cap = n + <span class="self">self</span>.len();
<span class="kw">let </span><span class="kw-2">mut </span>v = Vec::new();
v.try_reserve(cap)<span class="question-mark">?</span>;
<span class="kw">let </span>iter = <span class="self">self</span>.iter_mut().map(take);
v.extend(iter);
<span class="self">self</span>.set_len(<span class="number">0</span>);
<span class="kw">return </span><span class="prelude-val">Ok</span>(v);
}
<span class="doccomment">/// Drains all elements to a Vec
/// ```
/// # use tinyvec::*;
/// let mut av = array_vec!([i32; 7] =&gt; 1, 2, 3);
/// let v = av.drain_to_vec();
/// assert_eq!(v, &amp;[1, 2, 3]);
/// assert_eq!(v.capacity(), 3);
/// ```
</span><span class="kw">pub fn </span>drain_to_vec(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; Vec&lt;A::Item&gt; {
<span class="self">self</span>.drain_to_vec_and_reserve(<span class="number">0</span>)
}
<span class="doccomment">/// Tries to drain all elements to a Vec.
///
/// # Errors
///
/// If the allocator reports a failure, then an error is returned.
///
/// ```
/// # use tinyvec::*;
/// let mut av = array_vec!([i32; 7] =&gt; 1, 2, 3);
/// let v = av.try_drain_to_vec();
/// assert!(matches!(v, Ok(_)));
/// let v = v.unwrap();
/// assert_eq!(v, &amp;[1, 2, 3]);
/// // Vec may reserve more than necessary in order to prevent more future allocations.
/// assert!(v.capacity() &gt;= 3);
/// ```
</span><span class="attribute">#[cfg(feature = <span class="string">&quot;rustc_1_57&quot;</span>)]
</span><span class="kw">pub fn </span>try_drain_to_vec(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;Vec&lt;A::Item&gt;, TryReserveError&gt; {
<span class="self">self</span>.try_drain_to_vec_and_reserve(<span class="number">0</span>)
}
}
<span class="attribute">#[cfg(feature = <span class="string">&quot;serde&quot;</span>)]
</span><span class="kw">struct </span>ArrayVecVisitor&lt;A: Array&gt;(PhantomData&lt;A&gt;);
<span class="attribute">#[cfg(feature = <span class="string">&quot;serde&quot;</span>)]
</span><span class="kw">impl</span>&lt;<span class="lifetime">&#39;de</span>, A: Array&gt; Visitor&lt;<span class="lifetime">&#39;de</span>&gt; <span class="kw">for </span>ArrayVecVisitor&lt;A&gt;
<span class="kw">where
</span>A::Item: Deserialize&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="kw">type </span>Value = ArrayVec&lt;A&gt;;
<span class="kw">fn </span>expecting(
<span class="kw-2">&amp;</span><span class="self">self</span>, formatter: <span class="kw-2">&amp;mut </span>core::fmt::Formatter,
) -&gt; core::fmt::Result {
formatter.write_str(<span class="string">&quot;a sequence&quot;</span>)
}
<span class="kw">fn </span>visit_seq&lt;S&gt;(<span class="self">self</span>, <span class="kw-2">mut </span>seq: S) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Value, S::Error&gt;
<span class="kw">where
</span>S: SeqAccess&lt;<span class="lifetime">&#39;de</span>&gt;,
{
<span class="kw">let </span><span class="kw-2">mut </span>new_arrayvec: ArrayVec&lt;A&gt; = Default::default();
<span class="kw">let </span><span class="kw-2">mut </span>idx = <span class="number">0usize</span>;
<span class="kw">while let </span><span class="prelude-val">Some</span>(value) = seq.next_element()<span class="question-mark">? </span>{
<span class="kw">if </span>new_arrayvec.len() &gt;= new_arrayvec.capacity() {
<span class="kw">return </span><span class="prelude-val">Err</span>(DeserializeError::invalid_length(idx, <span class="kw-2">&amp;</span><span class="self">self</span>));
}
new_arrayvec.push(value);
idx = idx + <span class="number">1</span>;
}
<span class="prelude-val">Ok</span>(new_arrayvec)
}
}
</code></pre></div>
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