<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/heapless-0.8.0/src/linear_map.rs`."><title>linear_map.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="heapless" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.0 (9fc6b4312 2025-01-07)" data-channel="1.84.0" data-search-js="search-92e6798f.js" data-settings-js="settings-0f613d39.js" ><script src="../../static.files/storage-59e33391.js"></script><script defer src="../../static.files/src-script-56102188.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-893ab5e7.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-6580c154.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer"></div><main><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">heapless/</div>linear_map.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap"><div data-nosnippet><pre class="src-line-numbers">
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<a href="#555" id="555">555</a></pre></div><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::Vec;
<span class="kw">use </span>core::{borrow::Borrow, fmt, iter::FromIterator, mem, ops, slice};

<span class="doccomment">/// A fixed capacity map / dictionary that performs lookups via linear search
///
/// Note that as this map doesn't use hashing so most operations are **O(N)** instead of O(1)

</span><span class="kw">pub struct </span>LinearMap&lt;K, V, <span class="kw">const </span>N: usize&gt; {
    <span class="kw">pub</span>(<span class="kw">crate</span>) buffer: Vec&lt;(K, V), N&gt;,
}

<span class="kw">impl</span>&lt;K, V, <span class="kw">const </span>N: usize&gt; LinearMap&lt;K, V, N&gt; {
    <span class="doccomment">/// Creates an empty `LinearMap`
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::LinearMap;
    ///
    /// // allocate the map on the stack
    /// let mut map: LinearMap&lt;&amp;str, isize, 8&gt; = LinearMap::new();
    ///
    /// // allocate the map in a static variable
    /// static mut MAP: LinearMap&lt;&amp;str, isize, 8&gt; = LinearMap::new();
    /// ```
    </span><span class="kw">pub const fn </span>new() -&gt; <span class="self">Self </span>{
        <span class="self">Self </span>{ buffer: Vec::new() }
    }
}

<span class="kw">impl</span>&lt;K, V, <span class="kw">const </span>N: usize&gt; LinearMap&lt;K, V, N&gt;
<span class="kw">where
    </span>K: Eq,
{
    <span class="doccomment">/// Returns the number of elements that the map can hold
    ///
    /// Computes in **O(1)** time
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::LinearMap;
    ///
    /// let map: LinearMap&lt;&amp;str, isize, 8&gt; = LinearMap::new();
    /// assert_eq!(map.capacity(), 8);
    /// ```
    </span><span class="kw">pub fn </span>capacity(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
        N
    }

    <span class="doccomment">/// Clears the map, removing all key-value pairs
    ///
    /// Computes in **O(1)** time
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::LinearMap;
    ///
    /// let mut map: LinearMap&lt;_, _, 8&gt; = LinearMap::new();
    /// map.insert(1, "a").unwrap();
    /// map.clear();
    /// assert!(map.is_empty());
    /// ```
    </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>.buffer.clear()
    }

    <span class="doccomment">/// Returns true if the map contains a value for the specified key.
    ///
    /// Computes in **O(N)** time
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::LinearMap;
    ///
    /// let mut map: LinearMap&lt;_, _, 8&gt; = LinearMap::new();
    /// map.insert(1, "a").unwrap();
    /// assert_eq!(map.contains_key(&amp;1), true);
    /// assert_eq!(map.contains_key(&amp;2), false);
    /// ```
    </span><span class="kw">pub fn </span>contains_key(<span class="kw-2">&amp;</span><span class="self">self</span>, key: <span class="kw-2">&amp;</span>K) -&gt; bool {
        <span class="self">self</span>.get(key).is_some()
    }

    <span class="doccomment">/// Returns a reference to the value corresponding to the key
    ///
    /// Computes in **O(N)** time
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::LinearMap;
    ///
    /// let mut map: LinearMap&lt;_, _, 8&gt; = LinearMap::new();
    /// map.insert(1, "a").unwrap();
    /// assert_eq!(map.get(&amp;1), Some(&amp;"a"));
    /// assert_eq!(map.get(&amp;2), None);
    /// ```
    </span><span class="kw">pub fn </span>get&lt;Q&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, key: <span class="kw-2">&amp;</span>Q) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>V&gt;
    <span class="kw">where
        </span>K: Borrow&lt;Q&gt;,
        Q: Eq + <span class="question-mark">?</span>Sized,
    {
        <span class="self">self</span>.iter()
            .find(|<span class="kw-2">&amp;</span>(k, <span class="kw">_</span>)| k.borrow() == key)
            .map(|(<span class="kw">_</span>, v)| v)
    }

    <span class="doccomment">/// Returns a mutable reference to the value corresponding to the key
    ///
    /// Computes in **O(N)** time
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::LinearMap;
    ///
    /// let mut map: LinearMap&lt;_, _, 8&gt; = LinearMap::new();
    /// map.insert(1, "a").unwrap();
    /// if let Some(x) = map.get_mut(&amp;1) {
    ///     *x = "b";
    /// }
    /// assert_eq!(map[&amp;1], "b");
    /// ```
    </span><span class="kw">pub fn </span>get_mut&lt;Q&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, key: <span class="kw-2">&amp;</span>Q) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;mut </span>V&gt;
    <span class="kw">where
        </span>K: Borrow&lt;Q&gt;,
        Q: Eq + <span class="question-mark">?</span>Sized,
    {
        <span class="self">self</span>.iter_mut()
            .find(|<span class="kw-2">&amp;</span>(k, <span class="kw">_</span>)| k.borrow() == key)
            .map(|(<span class="kw">_</span>, v)| v)
    }

    <span class="doccomment">/// Returns the number of elements in this map
    ///
    /// Computes in **O(1)** time
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::LinearMap;
    ///
    /// let mut a: LinearMap&lt;_, _, 8&gt; = LinearMap::new();
    /// assert_eq!(a.len(), 0);
    /// a.insert(1, "a").unwrap();
    /// assert_eq!(a.len(), 1);
    /// ```
    </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>.buffer.len()
    }

    <span class="doccomment">/// Inserts a key-value pair into the map.
    ///
    /// If the map did not have this key present, `None` is returned.
    ///
    /// If the map did have this key present, the value is updated, and the old value is returned.
    ///
    /// Computes in **O(N)** time
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::LinearMap;
    ///
    /// let mut map: LinearMap&lt;_, _, 8&gt; = LinearMap::new();
    /// assert_eq!(map.insert(37, "a").unwrap(), None);
    /// assert_eq!(map.is_empty(), false);
    ///
    /// map.insert(37, "b").unwrap();
    /// assert_eq!(map.insert(37, "c").unwrap(), Some("b"));
    /// assert_eq!(map[&amp;37], "c");
    /// ```
    </span><span class="kw">pub fn </span>insert(<span class="kw-2">&amp;mut </span><span class="self">self</span>, key: K, <span class="kw-2">mut </span>value: V) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="prelude-ty">Option</span>&lt;V&gt;, (K, V)&gt; {
        <span class="kw">if let </span><span class="prelude-val">Some</span>((<span class="kw">_</span>, v)) = <span class="self">self</span>.iter_mut().find(|<span class="kw-2">&amp;</span>(k, <span class="kw">_</span>)| <span class="kw-2">*</span>k == key) {
            mem::swap(v, <span class="kw-2">&amp;mut </span>value);
            <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(value));
        }

        <span class="self">self</span>.buffer.push((key, value))<span class="question-mark">?</span>;
        <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>)
    }

    <span class="doccomment">/// Returns true if the map contains no elements
    ///
    /// Computes in **O(1)** time
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::LinearMap;
    ///
    /// let mut a: LinearMap&lt;_, _, 8&gt; = LinearMap::new();
    /// assert!(a.is_empty());
    /// a.insert(1, "a").unwrap();
    /// assert!(!a.is_empty());
    /// ```
    </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">/// An iterator visiting all key-value pairs in arbitrary order.
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::LinearMap;
    ///
    /// let mut map: LinearMap&lt;_, _, 8&gt; = LinearMap::new();
    /// map.insert("a", 1).unwrap();
    /// map.insert("b", 2).unwrap();
    /// map.insert("c", 3).unwrap();
    ///
    /// for (key, val) in map.iter() {
    ///     println!("key: {} val: {}", key, val);
    /// }
    /// ```
    </span><span class="kw">pub fn </span>iter(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Iter&lt;<span class="lifetime">'_</span>, K, V&gt; {
        Iter {
            iter: <span class="self">self</span>.buffer.as_slice().iter(),
        }
    }

    <span class="doccomment">/// An iterator visiting all key-value pairs in arbitrary order, with mutable references to the
    /// values
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::LinearMap;
    ///
    /// let mut map: LinearMap&lt;_, _, 8&gt; = LinearMap::new();
    /// map.insert("a", 1).unwrap();
    /// map.insert("b", 2).unwrap();
    /// map.insert("c", 3).unwrap();
    ///
    /// // Update all values
    /// for (_, val) in map.iter_mut() {
    ///     *val = 2;
    /// }
    ///
    /// for (key, val) in &amp;map {
    ///     println!("key: {} val: {}", key, val);
    /// }
    /// ```
    </span><span class="kw">pub fn </span>iter_mut(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; IterMut&lt;<span class="lifetime">'_</span>, K, V&gt; {
        IterMut {
            iter: <span class="self">self</span>.buffer.as_mut_slice().iter_mut(),
        }
    }

    <span class="doccomment">/// An iterator visiting all keys in arbitrary order
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::LinearMap;
    ///
    /// let mut map: LinearMap&lt;_, _, 8&gt; = LinearMap::new();
    /// map.insert("a", 1).unwrap();
    /// map.insert("b", 2).unwrap();
    /// map.insert("c", 3).unwrap();
    ///
    /// for key in map.keys() {
    ///     println!("{}", key);
    /// }
    /// ```
    </span><span class="kw">pub fn </span>keys(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw">impl </span>Iterator&lt;Item = <span class="kw-2">&amp;</span>K&gt; {
        <span class="self">self</span>.iter().map(|(k, <span class="kw">_</span>)| k)
    }

    <span class="doccomment">/// Removes a key from the map, returning the value at the key if the key was previously in the
    /// map
    ///
    /// Computes in **O(N)** time
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::LinearMap;
    ///
    /// let mut map: LinearMap&lt;_, _, 8&gt; = LinearMap::new();
    /// map.insert(1, "a").unwrap();
    /// assert_eq!(map.remove(&amp;1), Some("a"));
    /// assert_eq!(map.remove(&amp;1), None);
    /// ```
    </span><span class="kw">pub fn </span>remove&lt;Q&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, key: <span class="kw-2">&amp;</span>Q) -&gt; <span class="prelude-ty">Option</span>&lt;V&gt;
    <span class="kw">where
        </span>K: Borrow&lt;Q&gt;,
        Q: Eq + <span class="question-mark">?</span>Sized,
    {
        <span class="kw">let </span>idx = <span class="self">self
            </span>.keys()
            .enumerate()
            .find(|<span class="kw-2">&amp;</span>(<span class="kw">_</span>, k)| k.borrow() == key)
            .map(|(idx, <span class="kw">_</span>)| idx);

        idx.map(|idx| <span class="self">self</span>.buffer.swap_remove(idx).<span class="number">1</span>)
    }

    <span class="doccomment">/// An iterator visiting all values in arbitrary order
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::LinearMap;
    ///
    /// let mut map: LinearMap&lt;_, _, 8&gt; = LinearMap::new();
    /// map.insert("a", 1).unwrap();
    /// map.insert("b", 2).unwrap();
    /// map.insert("c", 3).unwrap();
    ///
    /// for val in map.values() {
    ///     println!("{}", val);
    /// }
    /// ```
    </span><span class="kw">pub fn </span>values(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw">impl </span>Iterator&lt;Item = <span class="kw-2">&amp;</span>V&gt; {
        <span class="self">self</span>.iter().map(|(<span class="kw">_</span>, v)| v)
    }

    <span class="doccomment">/// An iterator visiting all values mutably in arbitrary order
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::LinearMap;
    ///
    /// let mut map: LinearMap&lt;_, _, 8&gt; = LinearMap::new();
    /// map.insert("a", 1).unwrap();
    /// map.insert("b", 2).unwrap();
    /// map.insert("c", 3).unwrap();
    ///
    /// for val in map.values_mut() {
    ///     *val += 10;
    /// }
    ///
    /// for val in map.values() {
    ///     println!("{}", val);
    /// }
    /// ```
    </span><span class="kw">pub fn </span>values_mut(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw">impl </span>Iterator&lt;Item = <span class="kw-2">&amp;mut </span>V&gt; {
        <span class="self">self</span>.iter_mut().map(|(<span class="kw">_</span>, v)| v)
    }
}

<span class="kw">impl</span>&lt;<span class="lifetime">'a</span>, K, V, Q, <span class="kw">const </span>N: usize&gt; ops::Index&lt;<span class="kw-2">&amp;</span><span class="lifetime">'a </span>Q&gt; <span class="kw">for </span>LinearMap&lt;K, V, N&gt;
<span class="kw">where
    </span>K: Borrow&lt;Q&gt; + Eq,
    Q: Eq + <span class="question-mark">?</span>Sized,
{
    <span class="kw">type </span>Output = V;

    <span class="kw">fn </span>index(<span class="kw-2">&amp;</span><span class="self">self</span>, key: <span class="kw-2">&amp;</span>Q) -&gt; <span class="kw-2">&amp;</span>V {
        <span class="self">self</span>.get(key).expect(<span class="string">"no entry found for key"</span>)
    }
}

<span class="kw">impl</span>&lt;<span class="lifetime">'a</span>, K, V, Q, <span class="kw">const </span>N: usize&gt; ops::IndexMut&lt;<span class="kw-2">&amp;</span><span class="lifetime">'a </span>Q&gt; <span class="kw">for </span>LinearMap&lt;K, V, N&gt;
<span class="kw">where
    </span>K: Borrow&lt;Q&gt; + Eq,
    Q: Eq + <span class="question-mark">?</span>Sized,
{
    <span class="kw">fn </span>index_mut(<span class="kw-2">&amp;mut </span><span class="self">self</span>, key: <span class="kw-2">&amp;</span>Q) -&gt; <span class="kw-2">&amp;mut </span>V {
        <span class="self">self</span>.get_mut(key).expect(<span class="string">"no entry found for key"</span>)
    }
}

<span class="kw">impl</span>&lt;K, V, <span class="kw">const </span>N: usize&gt; Default <span class="kw">for </span>LinearMap&lt;K, V, N&gt;
<span class="kw">where
    </span>K: Eq,
{
    <span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
        <span class="self">Self</span>::new()
    }
}

<span class="kw">impl</span>&lt;K, V, <span class="kw">const </span>N: usize&gt; Clone <span class="kw">for </span>LinearMap&lt;K, V, N&gt;
<span class="kw">where
    </span>K: Eq + Clone,
    V: Clone,
{
    <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>{
            buffer: <span class="self">self</span>.buffer.clone(),
        }
    }
}

<span class="kw">impl</span>&lt;K, V, <span class="kw">const </span>N: usize&gt; fmt::Debug <span class="kw">for </span>LinearMap&lt;K, V, N&gt;
<span class="kw">where
    </span>K: Eq + fmt::Debug,
    V: fmt::Debug,
{
    <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>fmt::Formatter&lt;<span class="lifetime">'_</span>&gt;) -&gt; fmt::Result {
        f.debug_map().entries(<span class="self">self</span>.iter()).finish()
    }
}

<span class="kw">impl</span>&lt;K, V, <span class="kw">const </span>N: usize&gt; FromIterator&lt;(K, V)&gt; <span class="kw">for </span>LinearMap&lt;K, V, N&gt;
<span class="kw">where
    </span>K: Eq,
{
    <span class="kw">fn </span>from_iter&lt;I&gt;(iter: I) -&gt; <span class="self">Self
    </span><span class="kw">where
        </span>I: IntoIterator&lt;Item = (K, V)&gt;,
    {
        <span class="kw">let </span><span class="kw-2">mut </span>out = <span class="self">Self</span>::new();
        out.buffer.extend(iter);
        out
    }
}

<span class="kw">pub struct </span>IntoIter&lt;K, V, <span class="kw">const </span>N: usize&gt;
<span class="kw">where
    </span>K: Eq,
{
    inner: &lt;Vec&lt;(K, V), N&gt; <span class="kw">as </span>IntoIterator&gt;::IntoIter,
}

<span class="kw">impl</span>&lt;K, V, <span class="kw">const </span>N: usize&gt; Iterator <span class="kw">for </span>IntoIter&lt;K, V, N&gt;
<span class="kw">where
    </span>K: Eq,
{
    <span class="kw">type </span>Item = (K, V);
    <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="self">self</span>.inner.next()
    }
}

<span class="kw">impl</span>&lt;<span class="lifetime">'a</span>, K, V, <span class="kw">const </span>N: usize&gt; IntoIterator <span class="kw">for </span><span class="kw-2">&amp;</span><span class="lifetime">'a </span>LinearMap&lt;K, V, N&gt;
<span class="kw">where
    </span>K: Eq,
{
    <span class="kw">type </span>Item = (<span class="kw-2">&amp;</span><span class="lifetime">'a </span>K, <span class="kw-2">&amp;</span><span class="lifetime">'a </span>V);
    <span class="kw">type </span>IntoIter = Iter&lt;<span class="lifetime">'a</span>, K, V&gt;;

    <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">pub struct </span>Iter&lt;<span class="lifetime">'a</span>, K, V&gt; {
    iter: slice::Iter&lt;<span class="lifetime">'a</span>, (K, V)&gt;,
}

<span class="kw">impl</span>&lt;<span class="lifetime">'a</span>, K, V&gt; Iterator <span class="kw">for </span>Iter&lt;<span class="lifetime">'a</span>, K, V&gt; {
    <span class="kw">type </span>Item = (<span class="kw-2">&amp;</span><span class="lifetime">'a </span>K, <span class="kw-2">&amp;</span><span class="lifetime">'a </span>V);

    <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="self">self</span>.iter.next().map(|<span class="kw-2">&amp;</span>(<span class="kw-2">ref </span>k, <span class="kw-2">ref </span>v)| (k, v))
    }
}

<span class="kw">impl</span>&lt;<span class="lifetime">'a</span>, K, V&gt; Clone <span class="kw">for </span>Iter&lt;<span class="lifetime">'a</span>, K, V&gt; {
    <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>{
            iter: <span class="self">self</span>.iter.clone(),
        }
    }
}

<span class="kw">pub struct </span>IterMut&lt;<span class="lifetime">'a</span>, K, V&gt; {
    iter: slice::IterMut&lt;<span class="lifetime">'a</span>, (K, V)&gt;,
}

<span class="kw">impl</span>&lt;<span class="lifetime">'a</span>, K, V&gt; Iterator <span class="kw">for </span>IterMut&lt;<span class="lifetime">'a</span>, K, V&gt; {
    <span class="kw">type </span>Item = (<span class="kw-2">&amp;</span><span class="lifetime">'a </span>K, <span class="kw-2">&amp;</span><span class="lifetime">'a </span><span class="kw-2">mut </span>V);

    <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="self">self</span>.iter.next().map(|<span class="kw-2">&amp;mut </span>(<span class="kw-2">ref </span>k, <span class="kw-2">ref mut </span>v)| (k, v))
    }
}

<span class="kw">impl</span>&lt;K, V, <span class="kw">const </span>N: usize, <span class="kw">const </span>N2: usize&gt; PartialEq&lt;LinearMap&lt;K, V, N2&gt;&gt; <span class="kw">for </span>LinearMap&lt;K, V, N&gt;
<span class="kw">where
    </span>K: Eq,
    V: PartialEq,
{
    <span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>LinearMap&lt;K, V, N2&gt;) -&gt; bool {
        <span class="self">self</span>.len() == other.len()
            &amp;&amp; <span class="self">self
                </span>.iter()
                .all(|(key, value)| other.get(key).map_or(<span class="bool-val">false</span>, |v| <span class="kw-2">*</span>value == <span class="kw-2">*</span>v))
    }
}

<span class="kw">impl</span>&lt;K, V, <span class="kw">const </span>N: usize&gt; Eq <span class="kw">for </span>LinearMap&lt;K, V, N&gt;
<span class="kw">where
    </span>K: Eq,
    V: PartialEq,
{
}

<span class="attr">#[cfg(test)]
</span><span class="kw">mod </span>test {
    <span class="kw">use </span><span class="kw">crate</span>::LinearMap;

    <span class="attr">#[test]
    </span><span class="kw">fn </span>static_new() {
        <span class="kw">static </span><span class="kw-2">mut </span>_L: LinearMap&lt;i32, i32, <span class="number">8</span>&gt; = LinearMap::new();
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>partial_eq() {
        {
            <span class="kw">let </span><span class="kw-2">mut </span>a = LinearMap::&lt;<span class="kw">_</span>, <span class="kw">_</span>, <span class="number">1</span>&gt;::new();
            a.insert(<span class="string">"k1"</span>, <span class="string">"v1"</span>).unwrap();

            <span class="kw">let </span><span class="kw-2">mut </span>b = LinearMap::&lt;<span class="kw">_</span>, <span class="kw">_</span>, <span class="number">2</span>&gt;::new();
            b.insert(<span class="string">"k1"</span>, <span class="string">"v1"</span>).unwrap();

            <span class="macro">assert!</span>(a == b);

            b.insert(<span class="string">"k2"</span>, <span class="string">"v2"</span>).unwrap();

            <span class="macro">assert!</span>(a != b);
        }

        {
            <span class="kw">let </span><span class="kw-2">mut </span>a = LinearMap::&lt;<span class="kw">_</span>, <span class="kw">_</span>, <span class="number">2</span>&gt;::new();
            a.insert(<span class="string">"k1"</span>, <span class="string">"v1"</span>).unwrap();
            a.insert(<span class="string">"k2"</span>, <span class="string">"v2"</span>).unwrap();

            <span class="kw">let </span><span class="kw-2">mut </span>b = LinearMap::&lt;<span class="kw">_</span>, <span class="kw">_</span>, <span class="number">2</span>&gt;::new();
            b.insert(<span class="string">"k2"</span>, <span class="string">"v2"</span>).unwrap();
            b.insert(<span class="string">"k1"</span>, <span class="string">"v1"</span>).unwrap();

            <span class="macro">assert!</span>(a == b);
        }
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>drop() {
        <span class="macro">droppable!</span>();

        {
            <span class="kw">let </span><span class="kw-2">mut </span>v: LinearMap&lt;i32, Droppable, <span class="number">2</span>&gt; = LinearMap::new();
            v.insert(<span class="number">0</span>, Droppable::new()).ok().unwrap();
            v.insert(<span class="number">1</span>, Droppable::new()).ok().unwrap();
            v.remove(<span class="kw-2">&amp;</span><span class="number">1</span>).unwrap();
        }

        <span class="macro">assert_eq!</span>(Droppable::count(), <span class="number">0</span>);

        {
            <span class="kw">let </span><span class="kw-2">mut </span>v: LinearMap&lt;i32, Droppable, <span class="number">2</span>&gt; = LinearMap::new();
            v.insert(<span class="number">0</span>, Droppable::new()).ok().unwrap();
            v.insert(<span class="number">1</span>, Droppable::new()).ok().unwrap();
        }

        <span class="macro">assert_eq!</span>(Droppable::count(), <span class="number">0</span>);
    }
}
</code></pre></div></section></main></body></html>