<!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/string.rs`."><title>string.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>string.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="#856" id="856">856</a></pre></div><pre class="rust"><code><span class="kw">use </span>core::{
    cmp::Ordering,
    fmt,
    fmt::Write,
    hash, iter, ops,
    str::{<span class="self">self</span>, Utf8Error},
};

<span class="kw">use </span><span class="kw">crate</span>::Vec;

<span class="doccomment">/// A fixed capacity [`String`](https://doc.rust-lang.org/std/string/struct.String.html)
</span><span class="kw">pub struct </span>String&lt;<span class="kw">const </span>N: usize&gt; {
    vec: Vec&lt;u8, N&gt;,
}

<span class="kw">impl</span>&lt;<span class="kw">const </span>N: usize&gt; String&lt;N&gt; {
    <span class="doccomment">/// Constructs a new, empty `String` with a fixed capacity of `N` bytes
    ///
    /// # Examples
    ///
    /// Basic usage:
    ///
    /// ```
    /// use heapless::String;
    ///
    /// // allocate the string on the stack
    /// let mut s: String&lt;4&gt; = String::new();
    ///
    /// // allocate the string in a static variable
    /// static mut S: String&lt;4&gt; = String::new();
    /// ```
    </span><span class="attr">#[inline]
    </span><span class="kw">pub const fn </span>new() -&gt; <span class="self">Self </span>{
        <span class="self">Self </span>{ vec: Vec::new() }
    }

    <span class="doccomment">/// Convert UTF-8 bytes into a `String`.
    ///
    /// # Examples
    ///
    /// Basic usage:
    ///
    /// ```
    /// use heapless::{String, Vec};
    ///
    /// let mut sparkle_heart = Vec::&lt;u8, 4&gt;::new();
    /// sparkle_heart.extend_from_slice(&amp;[240, 159, 146, 150]);
    ///
    /// let sparkle_heart: String&lt;4&gt; = String::from_utf8(sparkle_heart)?;
    /// assert_eq!("💖", sparkle_heart);
    /// # Ok::&lt;(), core::str::Utf8Error&gt;(())
    /// ```
    ///
    /// Invalid UTF-8:
    ///
    /// ```
    /// use core::str::Utf8Error;
    /// use heapless::{String, Vec};
    ///
    /// let mut vec = Vec::&lt;u8, 4&gt;::new();
    /// vec.extend_from_slice(&amp;[0, 159, 146, 150]);
    ///
    /// let e: Utf8Error = String::from_utf8(vec).unwrap_err();
    /// assert_eq!(e.valid_up_to(), 1);
    /// # Ok::&lt;(), core::str::Utf8Error&gt;(())
    /// ```
    </span><span class="attr">#[inline]
    </span><span class="kw">pub fn </span>from_utf8(vec: Vec&lt;u8, N&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, Utf8Error&gt; {
        core::str::from_utf8(<span class="kw-2">&amp;</span>vec)<span class="question-mark">?</span>;
        <span class="prelude-val">Ok</span>(<span class="self">Self </span>{ vec })
    }

    <span class="doccomment">/// Convert UTF-8 bytes into a `String`, without checking that the string
    /// contains valid UTF-8.
    ///
    /// # Safety
    ///
    /// The bytes passed in must be valid UTF-8.
    ///
    /// # Examples
    ///
    /// Basic usage:
    ///
    /// ```
    /// use heapless::{String, Vec};
    ///
    /// let mut sparkle_heart = Vec::&lt;u8, 4&gt;::new();
    /// sparkle_heart.extend_from_slice(&amp;[240, 159, 146, 150]);
    ///
    /// // Safety: `sparkle_heart` Vec is known to contain valid UTF-8
    /// let sparkle_heart: String&lt;4&gt; = unsafe { String::from_utf8_unchecked(sparkle_heart) };
    /// assert_eq!("💖", sparkle_heart);
    /// ```
    </span><span class="attr">#[inline]
    </span><span class="kw">pub unsafe fn </span>from_utf8_unchecked(vec: Vec&lt;u8, N&gt;) -&gt; <span class="self">Self </span>{
        <span class="self">Self </span>{ vec }
    }

    <span class="doccomment">/// Converts a `String` into a byte vector.
    ///
    /// This consumes the `String`, so we do not need to copy its contents.
    ///
    /// # Examples
    ///
    /// Basic usage:
    ///
    /// ```
    /// use heapless::String;
    ///
    /// let s: String&lt;4&gt; = String::try_from("ab")?;
    /// let b = s.into_bytes();
    /// assert!(b.len() == 2);
    ///
    /// assert_eq!(&amp;['a' as u8, 'b' as u8], &amp;b[..]);
    /// # Ok::&lt;(), ()&gt;(())
    /// ```
    </span><span class="attr">#[inline]
    </span><span class="kw">pub fn </span>into_bytes(<span class="self">self</span>) -&gt; Vec&lt;u8, N&gt; {
        <span class="self">self</span>.vec
    }

    <span class="doccomment">/// Extracts a string slice containing the entire string.
    ///
    /// # Examples
    ///
    /// Basic usage:
    ///
    /// ```
    /// use heapless::String;
    ///
    /// let mut s: String&lt;4&gt; = String::try_from("ab")?;
    /// assert!(s.as_str() == "ab");
    ///
    /// let _s = s.as_str();
    /// // s.push('c'); // &lt;- cannot borrow `s` as mutable because it is also borrowed as immutable
    /// # Ok::&lt;(), ()&gt;(())
    /// ```
    </span><span class="attr">#[inline]
    </span><span class="kw">pub fn </span>as_str(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>str {
        <span class="kw">unsafe </span>{ str::from_utf8_unchecked(<span class="self">self</span>.vec.as_slice()) }
    }

    <span class="doccomment">/// Converts a `String` into a mutable string slice.
    ///
    /// # Examples
    ///
    /// Basic usage:
    ///
    /// ```
    /// use heapless::String;
    ///
    /// let mut s: String&lt;4&gt; = String::try_from("ab")?;
    /// let s = s.as_mut_str();
    /// s.make_ascii_uppercase();
    /// # Ok::&lt;(), ()&gt;(())
    /// ```
    </span><span class="attr">#[inline]
    </span><span class="kw">pub fn </span>as_mut_str(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>str {
        <span class="kw">unsafe </span>{ str::from_utf8_unchecked_mut(<span class="self">self</span>.vec.as_mut_slice()) }
    }

    <span class="doccomment">/// Returns a mutable reference to the contents of this `String`.
    ///
    /// # Safety
    ///
    /// This function is unsafe because it does not check that the bytes passed
    /// to it are valid UTF-8. If this constraint is violated, it may cause
    /// memory unsafety issues with future users of the `String`, as the rest of
    /// the library assumes that `String`s are valid UTF-8.
    ///
    /// # Examples
    ///
    /// Basic usage:
    ///
    /// ```
    /// use heapless::String;
    ///
    /// let mut s: String&lt;8&gt; = String::try_from("hello")?;
    ///
    /// unsafe {
    ///     let vec = s.as_mut_vec();
    ///     assert_eq!(&amp;[104, 101, 108, 108, 111][..], &amp;vec[..]);
    ///
    ///     vec.reverse();
    /// }
    /// assert_eq!(s, "olleh");
    /// # Ok::&lt;(), ()&gt;(())
    /// ```
    </span><span class="kw">pub unsafe fn </span>as_mut_vec(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>Vec&lt;u8, N&gt; {
        <span class="kw-2">&amp;mut </span><span class="self">self</span>.vec
    }

    <span class="doccomment">/// Appends a given string slice onto the end of this `String`.
    ///
    /// # Examples
    ///
    /// Basic usage:
    ///
    /// ```
    /// use heapless::String;
    ///
    /// let mut s: String&lt;8&gt; = String::try_from("foo")?;
    ///
    /// assert!(s.push_str("bar").is_ok());
    ///
    /// assert_eq!("foobar", s);
    ///
    /// assert!(s.push_str("tender").is_err());
    /// # Ok::&lt;(), ()&gt;(())
    /// ```
    </span><span class="attr">#[inline]
    </span><span class="kw">pub fn </span>push_str(<span class="kw-2">&amp;mut </span><span class="self">self</span>, string: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;(), ()&gt; {
        <span class="self">self</span>.vec.extend_from_slice(string.as_bytes())
    }

    <span class="doccomment">/// Returns the maximum number of elements the String can hold
    ///
    /// # Examples
    ///
    /// Basic usage:
    ///
    /// ```
    /// use heapless::String;
    ///
    /// let mut s: String&lt;4&gt; = String::new();
    /// assert!(s.capacity() == 4);
    /// ```
    </span><span class="attr">#[inline]
    </span><span class="kw">pub fn </span>capacity(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
        <span class="self">self</span>.vec.capacity()
    }

    <span class="doccomment">/// Appends the given [`char`] to the end of this `String`.
    ///
    /// # Examples
    ///
    /// Basic usage:
    ///
    /// ```
    /// use heapless::String;
    ///
    /// let mut s: String&lt;8&gt; = String::try_from("abc")?;
    ///
    /// s.push('1').unwrap();
    /// s.push('2').unwrap();
    /// s.push('3').unwrap();
    ///
    /// assert!("abc123" == s.as_str());
    ///
    /// assert_eq!("abc123", s);
    /// # Ok::&lt;(), ()&gt;(())
    /// ```
    </span><span class="attr">#[inline]
    </span><span class="kw">pub fn </span>push(<span class="kw-2">&amp;mut </span><span class="self">self</span>, c: char) -&gt; <span class="prelude-ty">Result</span>&lt;(), ()&gt; {
        <span class="kw">match </span>c.len_utf8() {
            <span class="number">1 </span>=&gt; <span class="self">self</span>.vec.push(c <span class="kw">as </span>u8).map_err(|<span class="kw">_</span>| {}),
            <span class="kw">_ </span>=&gt; <span class="self">self
                </span>.vec
                .extend_from_slice(c.encode_utf8(<span class="kw-2">&amp;mut </span>[<span class="number">0</span>; <span class="number">4</span>]).as_bytes()),
        }
    }

    <span class="doccomment">/// Shortens this `String` to the specified length.
    ///
    /// If `new_len` is greater than the string's current length, this has no
    /// effect.
    ///
    /// Note that this method has no effect on the allocated capacity
    /// of the string
    ///
    /// # Panics
    ///
    /// Panics if `new_len` does not lie on a [`char`] boundary.
    ///
    /// # Examples
    ///
    /// Basic usage:
    ///
    /// ```
    /// use heapless::String;
    ///
    /// let mut s: String&lt;8&gt; = String::try_from("hello")?;
    ///
    /// s.truncate(2);
    ///
    /// assert_eq!("he", s);
    /// # Ok::&lt;(), ()&gt;(())
    /// ```
    </span><span class="attr">#[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 &lt;= <span class="self">self</span>.len() {
            <span class="macro">assert!</span>(<span class="self">self</span>.is_char_boundary(new_len));
            <span class="self">self</span>.vec.truncate(new_len)
        }
    }

    <span class="doccomment">/// Removes the last character from the string buffer and returns it.
    ///
    /// Returns [`None`] if this `String` is empty.
    ///
    /// # Examples
    ///
    /// Basic usage:
    ///
    /// ```
    /// use heapless::String;
    ///
    /// let mut s: String&lt;8&gt; = String::try_from("foo")?;
    ///
    /// assert_eq!(s.pop(), Some('o'));
    /// assert_eq!(s.pop(), Some('o'));
    /// assert_eq!(s.pop(), Some('f'));
    ///
    /// assert_eq!(s.pop(), None);
    /// Ok::&lt;(), ()&gt;(())
    /// ```
    </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;char&gt; {
        <span class="kw">let </span>ch = <span class="self">self</span>.chars().rev().next()<span class="question-mark">?</span>;

        <span class="comment">// pop bytes that correspond to `ch`
        </span><span class="kw">for _ in </span><span class="number">0</span>..ch.len_utf8() {
            <span class="kw">unsafe </span>{
                <span class="self">self</span>.vec.pop_unchecked();
            }
        }

        <span class="prelude-val">Some</span>(ch)
    }

    <span class="doccomment">/// Removes a [`char`] from this `String` at a byte position and returns it.
    ///
    /// Note: Because this shifts over the remaining elements, it has a
    /// worst-case performance of *O*(*n*).
    ///
    /// # Panics
    ///
    /// Panics if `idx` is larger than or equal to the `String`'s length,
    /// or if it does not lie on a [`char`] boundary.
    ///
    /// # Examples
    ///
    /// Basic usage:
    ///
    /// ```
    /// use heapless::String;
    ///
    /// let mut s: String&lt;8&gt; = String::try_from("foo").unwrap();
    ///
    /// assert_eq!(s.remove(0), 'f');
    /// assert_eq!(s.remove(1), 'o');
    /// assert_eq!(s.remove(0), 'o');
    /// ```
    </span><span class="attr">#[inline]
    </span><span class="kw">pub fn </span>remove(<span class="kw-2">&amp;mut </span><span class="self">self</span>, index: usize) -&gt; char {
        <span class="kw">let </span>ch = <span class="kw">match </span><span class="self">self</span>[index..].chars().next() {
            <span class="prelude-val">Some</span>(ch) =&gt; ch,
            <span class="prelude-val">None </span>=&gt; <span class="macro">panic!</span>(<span class="string">"cannot remove a char from the end of a string"</span>),
        };

        <span class="kw">let </span>next = index + ch.len_utf8();
        <span class="kw">let </span>len = <span class="self">self</span>.len();
        <span class="kw">let </span>ptr = <span class="self">self</span>.vec.as_mut_ptr();
        <span class="kw">unsafe </span>{
            core::ptr::copy(ptr.add(next), ptr.add(index), len - next);
            <span class="self">self</span>.vec.set_len(len - (next - index));
        }
        ch
    }

    <span class="doccomment">/// Truncates this `String`, removing all contents.
    ///
    /// While this means the `String` will have a length of zero, it does not
    /// touch its capacity.
    ///
    /// # Examples
    ///
    /// Basic usage:
    ///
    /// ```
    /// use heapless::String;
    ///
    /// let mut s: String&lt;8&gt; = String::try_from("foo")?;
    ///
    /// s.clear();
    ///
    /// assert!(s.is_empty());
    /// assert_eq!(0, s.len());
    /// assert_eq!(8, s.capacity());
    /// Ok::&lt;(), ()&gt;(())
    /// ```
    </span><span class="attr">#[inline]
    </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>.vec.clear()
    }
}

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

<span class="kw">impl</span>&lt;<span class="lifetime">'a</span>, <span class="kw">const </span>N: usize&gt; TryFrom&lt;<span class="kw-2">&amp;</span><span class="lifetime">'a </span>str&gt; <span class="kw">for </span>String&lt;N&gt; {
    <span class="kw">type </span>Error = ();
    <span class="kw">fn </span>try_from(s: <span class="kw-2">&amp;</span><span class="lifetime">'a </span>str) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, <span class="self">Self</span>::Error&gt; {
        <span class="kw">let </span><span class="kw-2">mut </span>new = String::new();
        new.push_str(s)<span class="question-mark">?</span>;
        <span class="prelude-val">Ok</span>(new)
    }
}

<span class="kw">impl</span>&lt;<span class="kw">const </span>N: usize&gt; str::FromStr <span class="kw">for </span>String&lt;N&gt; {
    <span class="kw">type </span><span class="prelude-val">Err </span>= ();

    <span class="kw">fn </span>from_str(s: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, <span class="self">Self</span>::Err&gt; {
        <span class="kw">let </span><span class="kw-2">mut </span>new = String::new();
        new.push_str(s)<span class="question-mark">?</span>;
        <span class="prelude-val">Ok</span>(new)
    }
}

<span class="kw">impl</span>&lt;<span class="kw">const </span>N: usize&gt; iter::FromIterator&lt;char&gt; <span class="kw">for </span>String&lt;N&gt; {
    <span class="kw">fn </span>from_iter&lt;T: IntoIterator&lt;Item = char&gt;&gt;(iter: T) -&gt; <span class="self">Self </span>{
        <span class="kw">let </span><span class="kw-2">mut </span>new = String::new();
        <span class="kw">for </span>c <span class="kw">in </span>iter {
            new.push(c).unwrap();
        }
        new
    }
}

<span class="kw">impl</span>&lt;<span class="lifetime">'a</span>, <span class="kw">const </span>N: usize&gt; iter::FromIterator&lt;<span class="kw-2">&amp;</span><span class="lifetime">'a </span>char&gt; <span class="kw">for </span>String&lt;N&gt; {
    <span class="kw">fn </span>from_iter&lt;T: IntoIterator&lt;Item = <span class="kw-2">&amp;</span><span class="lifetime">'a </span>char&gt;&gt;(iter: T) -&gt; <span class="self">Self </span>{
        <span class="kw">let </span><span class="kw-2">mut </span>new = String::new();
        <span class="kw">for </span>c <span class="kw">in </span>iter {
            new.push(<span class="kw-2">*</span>c).unwrap();
        }
        new
    }
}

<span class="kw">impl</span>&lt;<span class="lifetime">'a</span>, <span class="kw">const </span>N: usize&gt; iter::FromIterator&lt;<span class="kw-2">&amp;</span><span class="lifetime">'a </span>str&gt; <span class="kw">for </span>String&lt;N&gt; {
    <span class="kw">fn </span>from_iter&lt;T: IntoIterator&lt;Item = <span class="kw-2">&amp;</span><span class="lifetime">'a </span>str&gt;&gt;(iter: T) -&gt; <span class="self">Self </span>{
        <span class="kw">let </span><span class="kw-2">mut </span>new = String::new();
        <span class="kw">for </span>c <span class="kw">in </span>iter {
            new.push_str(c).unwrap();
        }
        new
    }
}

<span class="kw">impl</span>&lt;<span class="kw">const </span>N: usize&gt; Clone <span class="kw">for </span>String&lt;N&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>{
            vec: <span class="self">self</span>.vec.clone(),
        }
    }
}

<span class="kw">impl</span>&lt;<span class="kw">const </span>N: usize&gt; fmt::Debug <span class="kw">for </span>String&lt;N&gt; {
    <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 {
        &lt;str <span class="kw">as </span>fmt::Debug&gt;::fmt(<span class="self">self</span>, f)
    }
}

<span class="kw">impl</span>&lt;<span class="kw">const </span>N: usize&gt; fmt::Display <span class="kw">for </span>String&lt;N&gt; {
    <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 {
        &lt;str <span class="kw">as </span>fmt::Display&gt;::fmt(<span class="self">self</span>, f)
    }
}

<span class="kw">impl</span>&lt;<span class="kw">const </span>N: usize&gt; hash::Hash <span class="kw">for </span>String&lt;N&gt; {
    <span class="attr">#[inline]
    </span><span class="kw">fn </span>hash&lt;H: hash::Hasher&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, hasher: <span class="kw-2">&amp;mut </span>H) {
        &lt;str <span class="kw">as </span>hash::Hash&gt;::hash(<span class="self">self</span>, hasher)
    }
}

<span class="kw">impl</span>&lt;<span class="kw">const </span>N: usize&gt; fmt::Write <span class="kw">for </span>String&lt;N&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; <span class="prelude-ty">Result</span>&lt;(), fmt::Error&gt; {
        <span class="self">self</span>.push_str(s).map_err(|<span class="kw">_</span>| fmt::Error)
    }

    <span class="kw">fn </span>write_char(<span class="kw-2">&amp;mut </span><span class="self">self</span>, c: char) -&gt; <span class="prelude-ty">Result</span>&lt;(), fmt::Error&gt; {
        <span class="self">self</span>.push(c).map_err(|<span class="kw">_</span>| fmt::Error)
    }
}

<span class="kw">impl</span>&lt;<span class="kw">const </span>N: usize&gt; ops::Deref <span class="kw">for </span>String&lt;N&gt; {
    <span class="kw">type </span>Target = str;

    <span class="kw">fn </span>deref(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>str {
        <span class="self">self</span>.as_str()
    }
}

<span class="kw">impl</span>&lt;<span class="kw">const </span>N: usize&gt; ops::DerefMut <span class="kw">for </span>String&lt;N&gt; {
    <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>str {
        <span class="self">self</span>.as_mut_str()
    }
}

<span class="kw">impl</span>&lt;<span class="kw">const </span>N: usize&gt; AsRef&lt;str&gt; <span class="kw">for </span>String&lt;N&gt; {
    <span class="attr">#[inline]
    </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>str {
        <span class="self">self
    </span>}
}

<span class="kw">impl</span>&lt;<span class="kw">const </span>N: usize&gt; AsRef&lt;[u8]&gt; <span class="kw">for </span>String&lt;N&gt; {
    <span class="attr">#[inline]
    </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>[u8] {
        <span class="self">self</span>.as_bytes()
    }
}

<span class="kw">impl</span>&lt;<span class="kw">const </span>N1: usize, <span class="kw">const </span>N2: usize&gt; PartialEq&lt;String&lt;N2&gt;&gt; <span class="kw">for </span>String&lt;N1&gt; {
    <span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, rhs: <span class="kw-2">&amp;</span>String&lt;N2&gt;) -&gt; bool {
        str::eq(<span class="kw-2">&amp;**</span><span class="self">self</span>, <span class="kw-2">&amp;**</span>rhs)
    }

    <span class="kw">fn </span>ne(<span class="kw-2">&amp;</span><span class="self">self</span>, rhs: <span class="kw-2">&amp;</span>String&lt;N2&gt;) -&gt; bool {
        str::ne(<span class="kw-2">&amp;**</span><span class="self">self</span>, <span class="kw-2">&amp;**</span>rhs)
    }
}

<span class="comment">// String&lt;N&gt; == str
</span><span class="kw">impl</span>&lt;<span class="kw">const </span>N: usize&gt; PartialEq&lt;str&gt; <span class="kw">for </span>String&lt;N&gt; {
    <span class="attr">#[inline]
    </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>str) -&gt; bool {
        str::eq(<span class="kw-2">&amp;</span><span class="self">self</span>[..], <span class="kw-2">&amp;</span>other[..])
    }
    <span class="attr">#[inline]
    </span><span class="kw">fn </span>ne(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>str) -&gt; bool {
        str::ne(<span class="kw-2">&amp;</span><span class="self">self</span>[..], <span class="kw-2">&amp;</span>other[..])
    }
}

<span class="comment">// String&lt;N&gt; == &amp;'str
</span><span class="kw">impl</span>&lt;<span class="kw">const </span>N: usize&gt; PartialEq&lt;<span class="kw-2">&amp;</span>str&gt; <span class="kw">for </span>String&lt;N&gt; {
    <span class="attr">#[inline]
    </span><span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: &amp;&amp;str) -&gt; bool {
        str::eq(<span class="kw-2">&amp;</span><span class="self">self</span>[..], <span class="kw-2">&amp;</span>other[..])
    }
    <span class="attr">#[inline]
    </span><span class="kw">fn </span>ne(<span class="kw-2">&amp;</span><span class="self">self</span>, other: &amp;&amp;str) -&gt; bool {
        str::ne(<span class="kw-2">&amp;</span><span class="self">self</span>[..], <span class="kw-2">&amp;</span>other[..])
    }
}

<span class="comment">// str == String&lt;N&gt;
</span><span class="kw">impl</span>&lt;<span class="kw">const </span>N: usize&gt; PartialEq&lt;String&lt;N&gt;&gt; <span class="kw">for </span>str {
    <span class="attr">#[inline]
    </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>String&lt;N&gt;) -&gt; bool {
        str::eq(<span class="kw-2">&amp;</span><span class="self">self</span>[..], <span class="kw-2">&amp;</span>other[..])
    }
    <span class="attr">#[inline]
    </span><span class="kw">fn </span>ne(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>String&lt;N&gt;) -&gt; bool {
        str::ne(<span class="kw-2">&amp;</span><span class="self">self</span>[..], <span class="kw-2">&amp;</span>other[..])
    }
}

<span class="comment">// &amp;'str == String&lt;N&gt;
</span><span class="kw">impl</span>&lt;<span class="kw">const </span>N: usize&gt; PartialEq&lt;String&lt;N&gt;&gt; <span class="kw">for </span><span class="kw-2">&amp;</span>str {
    <span class="attr">#[inline]
    </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>String&lt;N&gt;) -&gt; bool {
        str::eq(<span class="kw-2">&amp;</span><span class="self">self</span>[..], <span class="kw-2">&amp;</span>other[..])
    }
    <span class="attr">#[inline]
    </span><span class="kw">fn </span>ne(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>String&lt;N&gt;) -&gt; bool {
        str::ne(<span class="kw-2">&amp;</span><span class="self">self</span>[..], <span class="kw-2">&amp;</span>other[..])
    }
}

<span class="kw">impl</span>&lt;<span class="kw">const </span>N: usize&gt; Eq <span class="kw">for </span>String&lt;N&gt; {}

<span class="kw">impl</span>&lt;<span class="kw">const </span>N1: usize, <span class="kw">const </span>N2: usize&gt; PartialOrd&lt;String&lt;N2&gt;&gt; <span class="kw">for </span>String&lt;N1&gt; {
    <span class="attr">#[inline]
    </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>String&lt;N2&gt;) -&gt; <span class="prelude-ty">Option</span>&lt;Ordering&gt; {
        PartialOrd::partial_cmp(<span class="kw-2">&amp;**</span><span class="self">self</span>, <span class="kw-2">&amp;**</span>other)
    }
}

<span class="kw">impl</span>&lt;<span class="kw">const </span>N: usize&gt; Ord <span class="kw">for </span>String&lt;N&gt; {
    <span class="attr">#[inline]
    </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; Ordering {
        Ord::cmp(<span class="kw-2">&amp;**</span><span class="self">self</span>, <span class="kw-2">&amp;**</span>other)
    }
}

<span class="macro">macro_rules!</span> impl_try_from_num {
    (<span class="macro-nonterminal">$num</span>:ty, <span class="macro-nonterminal">$size</span>:expr) =&gt; {
        <span class="kw">impl</span>&lt;<span class="kw">const </span>N: usize&gt; core::convert::TryFrom&lt;<span class="macro-nonterminal">$num</span>&gt; <span class="kw">for </span>String&lt;N&gt; {
            <span class="kw">type </span>Error = ();
            <span class="kw">fn </span>try_from(s: <span class="macro-nonterminal">$num</span>) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, <span class="self">Self</span>::Error&gt; {
                <span class="kw">let </span><span class="kw-2">mut </span>new = String::new();
                <span class="macro">write!</span>(<span class="kw-2">&amp;mut </span>new, <span class="string">"{}"</span>, s).map_err(|<span class="kw">_</span>| ())<span class="question-mark">?</span>;
                <span class="prelude-val">Ok</span>(new)
            }
        }
    };
}

<span class="macro">impl_try_from_num!</span>(i8, <span class="number">4</span>);
<span class="macro">impl_try_from_num!</span>(i16, <span class="number">6</span>);
<span class="macro">impl_try_from_num!</span>(i32, <span class="number">11</span>);
<span class="macro">impl_try_from_num!</span>(i64, <span class="number">20</span>);

<span class="macro">impl_try_from_num!</span>(u8, <span class="number">3</span>);
<span class="macro">impl_try_from_num!</span>(u16, <span class="number">5</span>);
<span class="macro">impl_try_from_num!</span>(u32, <span class="number">10</span>);
<span class="macro">impl_try_from_num!</span>(u64, <span class="number">20</span>);

<span class="attr">#[cfg(test)]
</span><span class="kw">mod </span>tests {
    <span class="kw">use crate</span>::{String, Vec};
    <span class="kw">use </span>core::convert::TryFrom;

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

    <span class="attr">#[test]
    </span><span class="kw">fn </span>clone() {
        <span class="kw">let </span>s1: String&lt;<span class="number">20</span>&gt; = String::try_from(<span class="string">"abcd"</span>).unwrap();
        <span class="kw">let </span><span class="kw-2">mut </span>s2 = s1.clone();
        s2.push_str(<span class="string">" efgh"</span>).unwrap();

        <span class="macro">assert_eq!</span>(s1, <span class="string">"abcd"</span>);
        <span class="macro">assert_eq!</span>(s2, <span class="string">"abcd efgh"</span>);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>cmp() {
        <span class="kw">let </span>s1: String&lt;<span class="number">4</span>&gt; = String::try_from(<span class="string">"abcd"</span>).unwrap();
        <span class="kw">let </span>s2: String&lt;<span class="number">4</span>&gt; = String::try_from(<span class="string">"zzzz"</span>).unwrap();

        <span class="macro">assert!</span>(s1 &lt; s2);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>cmp_heterogenous_size() {
        <span class="kw">let </span>s1: String&lt;<span class="number">4</span>&gt; = String::try_from(<span class="string">"abcd"</span>).unwrap();
        <span class="kw">let </span>s2: String&lt;<span class="number">8</span>&gt; = String::try_from(<span class="string">"zzzz"</span>).unwrap();

        <span class="macro">assert!</span>(s1 &lt; s2);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>debug() {
        <span class="kw">use </span>core::fmt::Write;

        <span class="kw">let </span>s: String&lt;<span class="number">8</span>&gt; = String::try_from(<span class="string">"abcd"</span>).unwrap();
        <span class="kw">let </span><span class="kw-2">mut </span>std_s = std::string::String::new();
        <span class="macro">write!</span>(std_s, <span class="string">"{:?}"</span>, s).unwrap();
        <span class="macro">assert_eq!</span>(<span class="string">"\"abcd\""</span>, std_s);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>display() {
        <span class="kw">use </span>core::fmt::Write;

        <span class="kw">let </span>s: String&lt;<span class="number">8</span>&gt; = String::try_from(<span class="string">"abcd"</span>).unwrap();
        <span class="kw">let </span><span class="kw-2">mut </span>std_s = std::string::String::new();
        <span class="macro">write!</span>(std_s, <span class="string">"{}"</span>, s).unwrap();
        <span class="macro">assert_eq!</span>(<span class="string">"abcd"</span>, std_s);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>empty() {
        <span class="kw">let </span>s: String&lt;<span class="number">4</span>&gt; = String::new();
        <span class="macro">assert!</span>(s.capacity() == <span class="number">4</span>);
        <span class="macro">assert_eq!</span>(s, <span class="string">""</span>);
        <span class="macro">assert_eq!</span>(s.len(), <span class="number">0</span>);
        <span class="macro">assert_ne!</span>(s.len(), <span class="number">4</span>);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>try_from() {
        <span class="kw">let </span>s: String&lt;<span class="number">4</span>&gt; = String::try_from(<span class="string">"123"</span>).unwrap();
        <span class="macro">assert!</span>(s.len() == <span class="number">3</span>);
        <span class="macro">assert_eq!</span>(s, <span class="string">"123"</span>);

        <span class="kw">let </span>e: () = String::&lt;<span class="number">2</span>&gt;::try_from(<span class="string">"123"</span>).unwrap_err();
        <span class="macro">assert_eq!</span>(e, ());
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>from_str() {
        <span class="kw">use </span>core::str::FromStr;

        <span class="kw">let </span>s: String&lt;<span class="number">4</span>&gt; = String::&lt;<span class="number">4</span>&gt;::from_str(<span class="string">"123"</span>).unwrap();
        <span class="macro">assert!</span>(s.len() == <span class="number">3</span>);
        <span class="macro">assert_eq!</span>(s, <span class="string">"123"</span>);

        <span class="kw">let </span>e: () = String::&lt;<span class="number">2</span>&gt;::from_str(<span class="string">"123"</span>).unwrap_err();
        <span class="macro">assert_eq!</span>(e, ());
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>from_iter() {
        <span class="kw">let </span><span class="kw-2">mut </span>v: Vec&lt;char, <span class="number">5</span>&gt; = Vec::new();
        v.push(<span class="string">'h'</span>).unwrap();
        v.push(<span class="string">'e'</span>).unwrap();
        v.push(<span class="string">'l'</span>).unwrap();
        v.push(<span class="string">'l'</span>).unwrap();
        v.push(<span class="string">'o'</span>).unwrap();
        <span class="kw">let </span>string1: String&lt;<span class="number">5</span>&gt; = v.iter().collect(); <span class="comment">//&amp;char
        </span><span class="kw">let </span>string2: String&lt;<span class="number">5</span>&gt; = <span class="string">"hello"</span>.chars().collect(); <span class="comment">//char
        </span><span class="macro">assert_eq!</span>(string1, <span class="string">"hello"</span>);
        <span class="macro">assert_eq!</span>(string2, <span class="string">"hello"</span>);
    }

    <span class="attr">#[test]
    #[should_panic]
    </span><span class="kw">fn </span>from_panic() {
        <span class="kw">let _</span>: String&lt;<span class="number">4</span>&gt; = String::try_from(<span class="string">"12345"</span>).unwrap();
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>try_from_num() {
        <span class="kw">let </span>v: String&lt;<span class="number">20</span>&gt; = String::try_from(<span class="number">18446744073709551615 </span><span class="kw">as </span>u64).unwrap();
        <span class="macro">assert_eq!</span>(v, <span class="string">"18446744073709551615"</span>);

        <span class="kw">let </span>e: () = String::&lt;<span class="number">2</span>&gt;::try_from(<span class="number">18446744073709551615 </span><span class="kw">as </span>u64).unwrap_err();
        <span class="macro">assert_eq!</span>(e, ());
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>into_bytes() {
        <span class="kw">let </span>s: String&lt;<span class="number">4</span>&gt; = String::try_from(<span class="string">"ab"</span>).unwrap();
        <span class="kw">let </span>b: Vec&lt;u8, <span class="number">4</span>&gt; = s.into_bytes();
        <span class="macro">assert_eq!</span>(b.len(), <span class="number">2</span>);
        <span class="macro">assert_eq!</span>(<span class="kw-2">&amp;</span>[<span class="string">'a' </span><span class="kw">as </span>u8, <span class="string">'b' </span><span class="kw">as </span>u8], <span class="kw-2">&amp;</span>b[..]);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>as_str() {
        <span class="kw">let </span>s: String&lt;<span class="number">4</span>&gt; = String::try_from(<span class="string">"ab"</span>).unwrap();

        <span class="macro">assert_eq!</span>(s.as_str(), <span class="string">"ab"</span>);
        <span class="comment">// should be moved to fail test
        //    let _s = s.as_str();
        // s.push('c'); // &lt;- cannot borrow `s` as mutable because it is also borrowed as immutable
    </span>}

    <span class="attr">#[test]
    </span><span class="kw">fn </span>as_mut_str() {
        <span class="kw">let </span><span class="kw-2">mut </span>s: String&lt;<span class="number">4</span>&gt; = String::try_from(<span class="string">"ab"</span>).unwrap();
        <span class="kw">let </span>s = s.as_mut_str();
        s.make_ascii_uppercase();
        <span class="macro">assert_eq!</span>(s, <span class="string">"AB"</span>);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>push_str() {
        <span class="kw">let </span><span class="kw-2">mut </span>s: String&lt;<span class="number">8</span>&gt; = String::try_from(<span class="string">"foo"</span>).unwrap();
        <span class="macro">assert!</span>(s.push_str(<span class="string">"bar"</span>).is_ok());
        <span class="macro">assert_eq!</span>(<span class="string">"foobar"</span>, s);
        <span class="macro">assert_eq!</span>(s, <span class="string">"foobar"</span>);
        <span class="macro">assert!</span>(s.push_str(<span class="string">"tender"</span>).is_err());
        <span class="macro">assert_eq!</span>(<span class="string">"foobar"</span>, s);
        <span class="macro">assert_eq!</span>(s, <span class="string">"foobar"</span>);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>push() {
        <span class="kw">let </span><span class="kw-2">mut </span>s: String&lt;<span class="number">6</span>&gt; = String::try_from(<span class="string">"abc"</span>).unwrap();
        <span class="macro">assert!</span>(s.push(<span class="string">'1'</span>).is_ok());
        <span class="macro">assert!</span>(s.push(<span class="string">'2'</span>).is_ok());
        <span class="macro">assert!</span>(s.push(<span class="string">'3'</span>).is_ok());
        <span class="macro">assert!</span>(s.push(<span class="string">'4'</span>).is_err());
        <span class="macro">assert!</span>(<span class="string">"abc123" </span>== s.as_str());
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>as_bytes() {
        <span class="kw">let </span>s: String&lt;<span class="number">8</span>&gt; = String::try_from(<span class="string">"hello"</span>).unwrap();
        <span class="macro">assert_eq!</span>(<span class="kw-2">&amp;</span>[<span class="number">104</span>, <span class="number">101</span>, <span class="number">108</span>, <span class="number">108</span>, <span class="number">111</span>], s.as_bytes());
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>truncate() {
        <span class="kw">let </span><span class="kw-2">mut </span>s: String&lt;<span class="number">8</span>&gt; = String::try_from(<span class="string">"hello"</span>).unwrap();
        s.truncate(<span class="number">6</span>);
        <span class="macro">assert_eq!</span>(s.len(), <span class="number">5</span>);
        s.truncate(<span class="number">2</span>);
        <span class="macro">assert_eq!</span>(s.len(), <span class="number">2</span>);
        <span class="macro">assert_eq!</span>(<span class="string">"he"</span>, s);
        <span class="macro">assert_eq!</span>(s, <span class="string">"he"</span>);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>pop() {
        <span class="kw">let </span><span class="kw-2">mut </span>s: String&lt;<span class="number">8</span>&gt; = String::try_from(<span class="string">"foo"</span>).unwrap();
        <span class="macro">assert_eq!</span>(s.pop(), <span class="prelude-val">Some</span>(<span class="string">'o'</span>));
        <span class="macro">assert_eq!</span>(s.pop(), <span class="prelude-val">Some</span>(<span class="string">'o'</span>));
        <span class="macro">assert_eq!</span>(s.pop(), <span class="prelude-val">Some</span>(<span class="string">'f'</span>));
        <span class="macro">assert_eq!</span>(s.pop(), <span class="prelude-val">None</span>);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>pop_uenc() {
        <span class="kw">let </span><span class="kw-2">mut </span>s: String&lt;<span class="number">8</span>&gt; = String::try_from(<span class="string">"é"</span>).unwrap();
        <span class="macro">assert_eq!</span>(s.len(), <span class="number">3</span>);
        <span class="kw">match </span>s.pop() {
            <span class="prelude-val">Some</span>(c) =&gt; {
                <span class="macro">assert_eq!</span>(s.len(), <span class="number">1</span>);
                <span class="macro">assert_eq!</span>(c, <span class="string">'\u{0301}'</span>); <span class="comment">// accute accent of e
                </span>()
            }
            <span class="prelude-val">None </span>=&gt; <span class="macro">assert!</span>(<span class="bool-val">false</span>),
        };
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>is_empty() {
        <span class="kw">let </span><span class="kw-2">mut </span>v: String&lt;<span class="number">8</span>&gt; = String::new();
        <span class="macro">assert!</span>(v.is_empty());
        <span class="kw">let _ </span>= v.push(<span class="string">'a'</span>);
        <span class="macro">assert!</span>(!v.is_empty());
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>clear() {
        <span class="kw">let </span><span class="kw-2">mut </span>s: String&lt;<span class="number">8</span>&gt; = String::try_from(<span class="string">"foo"</span>).unwrap();
        s.clear();
        <span class="macro">assert!</span>(s.is_empty());
        <span class="macro">assert_eq!</span>(<span class="number">0</span>, s.len());
        <span class="macro">assert_eq!</span>(<span class="number">8</span>, s.capacity());
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>remove() {
        <span class="kw">let </span><span class="kw-2">mut </span>s: String&lt;<span class="number">8</span>&gt; = String::try_from(<span class="string">"foo"</span>).unwrap();
        <span class="macro">assert_eq!</span>(s.remove(<span class="number">0</span>), <span class="string">'f'</span>);
        <span class="macro">assert_eq!</span>(s.as_str(), <span class="string">"oo"</span>);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>remove_uenc() {
        <span class="kw">let </span><span class="kw-2">mut </span>s: String&lt;<span class="number">8</span>&gt; = String::try_from(<span class="string">"ĝėēƶ"</span>).unwrap();
        <span class="macro">assert_eq!</span>(s.remove(<span class="number">2</span>), <span class="string">'ė'</span>);
        <span class="macro">assert_eq!</span>(s.remove(<span class="number">2</span>), <span class="string">'ē'</span>);
        <span class="macro">assert_eq!</span>(s.remove(<span class="number">2</span>), <span class="string">'ƶ'</span>);
        <span class="macro">assert_eq!</span>(s.as_str(), <span class="string">"ĝ"</span>);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>remove_uenc_combo_characters() {
        <span class="kw">let </span><span class="kw-2">mut </span>s: String&lt;<span class="number">8</span>&gt; = String::try_from(<span class="string">"héy"</span>).unwrap();
        <span class="macro">assert_eq!</span>(s.remove(<span class="number">2</span>), <span class="string">'\u{0301}'</span>);
        <span class="macro">assert_eq!</span>(s.as_str(), <span class="string">"hey"</span>);
    }
}
</code></pre></div></section></main></body></html>