<!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="API documentation for the Rust `decode_utf16` fn in crate `std_unicode`."> <meta name="keywords" content="rust, rustlang, rust-lang, decode_utf16"> <title>std_unicode::char::decode_utf16 - Rust</title> <link rel="stylesheet" type="text/css" href="../../normalize.css"> <link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"> <link rel="stylesheet" type="text/css" href="../../dark.css"> <link rel="stylesheet" type="text/css" href="../../main.css" id="themeStyle"> <script src="../../storage.js"></script> <link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"> </head> <body class="rustdoc fn"> <!--[if lte IE 8]> <div class="warning"> This old browser is unsupported and will most likely display funky things. </div> <![endif]--> <nav class="sidebar"> <div class="sidebar-menu">☰</div> <a href='../../std_unicode/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a> <p class='location'><a href='../index.html'>std_unicode</a>::<wbr><a href='index.html'>char</a></p><script>window.sidebarCurrent = {name: 'decode_utf16', ty: 'fn', relpath: ''};</script><script defer src="sidebar-items.js"></script> </nav> <div class="theme-picker"> <button id="theme-picker" aria-label="Pick another theme!"> <img src="../../brush.svg" width="18" alt="Pick another theme!"> </button> <div id="theme-choices"></div> </div> <script src="../../theme.js"></script> <nav class="sub"> <form class="search-form js-only"> <div class="search-container"> <input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"> </div> </form> </nav> <section id='main' class="content"> <h1 class='fqn'><span class='in-band'>Function <a href='../index.html'>std_unicode</a>::<wbr><a href='index.html'>char</a>::<wbr><a class="fn" href=''>decode_utf16</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version 1.9.0'>1.9.0</span><span id='render-detail'> <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs"> [<span class='inner'>−</span>] </a> </span><a class='srclink' href='../../src/std_unicode/char.rs.html#1519-1524' title='goto source code'>[src]</a></span></h1> <div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="struct" href="../../std_unicode/char/struct.DecodeUtf16.html" title="struct std_unicode::char::DecodeUtf16">DecodeUtf16</a><I></span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="../../std_unicode/char/struct.DecodeUtf16.html" title="struct std_unicode::char::DecodeUtf16">DecodeUtf16</a><I></h3><code class="content"><span class="where fmt-newline">impl<I: <a class="trait" href="../../core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a><Item = u16>> <a class="trait" href="../../core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> for <a class="struct" href="../../std_unicode/char/struct.DecodeUtf16.html" title="struct std_unicode::char::DecodeUtf16">DecodeUtf16</a><I></span><span class="where fmt-newline"> type <a href='../../core/iter/iterator/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <a class="enum" href="../../core/result/enum.Result.html" title="enum core::result::Result">Result</a><char, <a class="struct" href="../../std_unicode/char/struct.DecodeUtf16Error.html" title="struct std_unicode::char::DecodeUtf16Error">DecodeUtf16Error</a>>;</span></code></div></div><pre class='rust fn'>pub fn decode_utf16<I: <a class="trait" href="../../core/iter/traits/trait.IntoIterator.html" title="trait core::iter::traits::IntoIterator">IntoIterator</a><Item = u16>>(<br> iter: I<br>) -> <a class="struct" href="../../std_unicode/char/struct.DecodeUtf16.html" title="struct std_unicode::char::DecodeUtf16">DecodeUtf16</a><I::<a class="type" href="../../core/iter/traits/trait.IntoIterator.html#associatedtype.IntoIter" title="type core::iter::traits::IntoIterator::IntoIter">IntoIter</a>></pre><div class='docblock'><p>Create an iterator over the UTF-16 encoded code points in <code>iter</code>, returning unpaired surrogates as <code>Err</code>s.</p> <h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1> <p>Basic usage:</p> <pre class="rust rust-example-rendered"> <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">char</span>::<span class="ident">decode_utf16</span>; <span class="kw">fn</span> <span class="ident">main</span>() { <span class="comment">// 𝄞mus<invalid>ic<invalid></span> <span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> [<span class="number">0xD834</span>, <span class="number">0xDD1E</span>, <span class="number">0x006d</span>, <span class="number">0x0075</span>, <span class="number">0x0073</span>, <span class="number">0xDD1E</span>, <span class="number">0x0069</span>, <span class="number">0x0063</span>, <span class="number">0xD834</span>]; <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decode_utf16</span>(<span class="ident">v</span>.<span class="ident">iter</span>().<span class="ident">cloned</span>()) .<span class="ident">map</span>(<span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">r</span>.<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> <span class="ident">e</span>.<span class="ident">unpaired_surrogate</span>())) .<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span>_<span class="op">>></span>(), <span class="macro">vec</span><span class="macro">!</span>[<span class="prelude-val">Ok</span>(<span class="string">'𝄞'</span>), <span class="prelude-val">Ok</span>(<span class="string">'m'</span>), <span class="prelude-val">Ok</span>(<span class="string">'u'</span>), <span class="prelude-val">Ok</span>(<span class="string">'s'</span>), <span class="prelude-val">Err</span>(<span class="number">0xDD1E</span>), <span class="prelude-val">Ok</span>(<span class="string">'i'</span>), <span class="prelude-val">Ok</span>(<span class="string">'c'</span>), <span class="prelude-val">Err</span>(<span class="number">0xD834</span>)]); }<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Ause%20std%3A%3Achar%3A%3Adecode_utf16%3B%0A%0Afn%20main()%20%7B%0A%20%20%20%20%2F%2F%20%F0%9D%84%9Emus%3Cinvalid%3Eic%3Cinvalid%3E%0A%20%20%20%20let%20v%20%3D%20%5B0xD834%2C%200xDD1E%2C%200x006d%2C%200x0075%2C%0A%20%20%20%20%20%20%20%20%20%20%20%20%200x0073%2C%200xDD1E%2C%200x0069%2C%200x0063%2C%0A%20%20%20%20%20%20%20%20%20%20%20%20%200xD834%5D%3B%0A%0A%20%20%20%20assert_eq!(decode_utf16(v.iter().cloned())%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.map(%7Cr%7C%20r.map_err(%7Ce%7C%20e.unpaired_surrogate()))%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.collect%3A%3A%3CVec%3C_%3E%3E()%2C%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20vec!%5BOk('%F0%9D%84%9E')%2C%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20Ok('m')%2C%20Ok('u')%2C%20Ok('s')%2C%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20Err(0xDD1E)%2C%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20Ok('i')%2C%20Ok('c')%2C%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20Err(0xD834)%5D)%3B%0A%7D%0A">Run</a></pre> <p>A lossy decoder can be obtained by replacing <code>Err</code> results with the replacement character:</p> <pre class="rust rust-example-rendered"> <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">char</span>::{<span class="ident">decode_utf16</span>, <span class="ident">REPLACEMENT_CHARACTER</span>}; <span class="kw">fn</span> <span class="ident">main</span>() { <span class="comment">// 𝄞mus<invalid>ic<invalid></span> <span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> [<span class="number">0xD834</span>, <span class="number">0xDD1E</span>, <span class="number">0x006d</span>, <span class="number">0x0075</span>, <span class="number">0x0073</span>, <span class="number">0xDD1E</span>, <span class="number">0x0069</span>, <span class="number">0x0063</span>, <span class="number">0xD834</span>]; <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">decode_utf16</span>(<span class="ident">v</span>.<span class="ident">iter</span>().<span class="ident">cloned</span>()) .<span class="ident">map</span>(<span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">r</span>.<span class="ident">unwrap_or</span>(<span class="ident">REPLACEMENT_CHARACTER</span>)) .<span class="ident">collect</span>::<span class="op"><</span><span class="ident">String</span><span class="op">></span>(), <span class="string">"𝄞mus�ic�"</span>); }<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Ause%20std%3A%3Achar%3A%3A%7Bdecode_utf16%2C%20REPLACEMENT_CHARACTER%7D%3B%0A%0Afn%20main()%20%7B%0A%20%20%20%20%2F%2F%20%F0%9D%84%9Emus%3Cinvalid%3Eic%3Cinvalid%3E%0A%20%20%20%20let%20v%20%3D%20%5B0xD834%2C%200xDD1E%2C%200x006d%2C%200x0075%2C%0A%20%20%20%20%20%20%20%20%20%20%20%20%200x0073%2C%200xDD1E%2C%200x0069%2C%200x0063%2C%0A%20%20%20%20%20%20%20%20%20%20%20%20%200xD834%5D%3B%0A%0A%20%20%20%20assert_eq!(decode_utf16(v.iter().cloned())%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.map(%7Cr%7C%20r.unwrap_or(REPLACEMENT_CHARACTER))%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.collect%3A%3A%3CString%3E()%2C%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%22%F0%9D%84%9Emus%EF%BF%BDic%EF%BF%BD%22)%3B%0A%7D%0A">Run</a></pre> </div></section> <section id='search' class="content hidden"></section> <section class="footer"></section> <aside id="help" class="hidden"> <div> <h1 class="hidden">Help</h1> <div class="shortcuts"> <h2>Keyboard Shortcuts</h2> <dl> <dt><kbd>?</kbd></dt> <dd>Show this help dialog</dd> <dt><kbd>S</kbd></dt> <dd>Focus the search field</dd> <dt><kbd>↑</kbd></dt> <dd>Move up in search results</dd> <dt><kbd>↓</kbd></dt> <dd>Move down in search results</dd> <dt><kbd>↹</kbd></dt> <dd>Switch tab</dd> <dt><kbd>⏎</kbd></dt> <dd>Go to active search result</dd> <dt><kbd>+</kbd></dt> <dd>Expand all sections</dd> <dt><kbd>-</kbd></dt> <dd>Collapse all sections</dd> </dl> </div> <div class="infos"> <h2>Search Tricks</h2> <p> Prefix searches with a type followed by a colon (e.g. <code>fn:</code>) to restrict the search to a given type. </p> <p> Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>. </p> <p> Search functions by type signature (e.g. <code>vec -> usize</code> or <code>* -> vec</code>) </p> </div> </div> </aside> <script> window.rootPath = "../../"; 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