<!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 `Default` trait in crate `core`."> <meta name="keywords" content="rust, rustlang, rust-lang, Default"> <title>core::default::Default - 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 trait"> <!--[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='../../core/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a> <p class='location'>Trait Default</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.default">default</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>core</a>::<wbr><a href='index.html'>default</a></p><script>window.sidebarCurrent = {name: 'Default', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script></div> </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'>Trait <a href='../index.html'>core</a>::<wbr><a href='index.html'>default</a>::<wbr><a class="trait" href=''>Default</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version 1.0.0'>1.0.0</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/core/default.rs.html#94-126' title='goto source code'>[src]</a></span></h1> <pre class='rust trait'>pub trait Default: <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> { fn <a href='#tymethod.default' class='fnname'>default</a>() -> Self; }</pre><div class='docblock'><p>A trait for giving a type a useful default value.</p> <p>Sometimes, you want to fall back to some kind of default value, and don't particularly care what it is. This comes up often with <code>struct</code>s that define a set of options:</p> <pre class="rust rust-example-rendered"> <span class="kw">struct</span> <span class="ident">SomeOptions</span> { <span class="ident">foo</span>: <span class="ident">i32</span>, <span class="ident">bar</span>: <span class="ident">f32</span>, }<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0A%23%5Ballow(dead_code)%5D%0Astruct%20SomeOptions%20%7B%0A%20%20%20%20foo%3A%20i32%2C%0A%20%20%20%20bar%3A%20f32%2C%0A%7D%0A%7D">Run</a></pre> <p>How can we define some default values? You can use <code>Default</code>:</p> <pre class="rust rust-example-rendered"> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Default</span>)]</span> <span class="kw">struct</span> <span class="ident">SomeOptions</span> { <span class="ident">foo</span>: <span class="ident">i32</span>, <span class="ident">bar</span>: <span class="ident">f32</span>, } <span class="kw">fn</span> <span class="ident">main</span>() { <span class="kw">let</span> <span class="ident">options</span>: <span class="ident">SomeOptions</span> <span class="op">=</span> <span class="ident">Default</span>::<span class="ident">default</span>(); }<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0A%23%5Ballow(dead_code)%5D%0A%23%5Bderive(Default)%5D%0Astruct%20SomeOptions%20%7B%0A%20%20%20%20foo%3A%20i32%2C%0A%20%20%20%20bar%3A%20f32%2C%0A%7D%0A%0Afn%20main()%20%7B%0A%20%20%20%20let%20options%3A%20SomeOptions%20%3D%20Default%3A%3Adefault()%3B%0A%7D%0A">Run</a></pre> <p>Now, you get all of the default values. Rust implements <code>Default</code> for various primitives types.</p> <p>If you want to override a particular option, but still retain the other defaults:</p> <pre class="rust rust-example-rendered"> <span class="kw">fn</span> <span class="ident">main</span>() { <span class="kw">let</span> <span class="ident">options</span> <span class="op">=</span> <span class="ident">SomeOptions</span> { <span class="ident">foo</span>: <span class="number">42</span>, ..<span class="ident">Default</span>::<span class="ident">default</span>() }; }<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0A%23%5Ballow(dead_code)%5D%0A%23%5Bderive(Default)%5D%0Astruct%20SomeOptions%20%7B%0A%20%20%20%20foo%3A%20i32%2C%0A%20%20%20%20bar%3A%20f32%2C%0A%7D%0Afn%20main()%20%7B%0A%20%20%20%20let%20options%20%3D%20SomeOptions%20%7B%20foo%3A%2042%2C%20..Default%3A%3Adefault()%20%7D%3B%0A%7D%0A">Run</a></pre> <h2 id="derivable" class="section-header"><a href="#derivable">Derivable</a></h2> <p>This trait can be used with <code>#[derive]</code> if all of the type's fields implement <code>Default</code>. When <code>derive</code>d, it will use the default value for each field's type.</p> <h2 id="how-can-i-implement-default" class="section-header"><a href="#how-can-i-implement-default">How can I implement <code>Default</code>?</a></h2> <p>Provide an implementation for the <code>default()</code> method that returns the value of your type that should be the default:</p> <pre class="rust rust-example-rendered"> <span class="kw">enum</span> <span class="ident">Kind</span> { <span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">C</span>, } <span class="kw">impl</span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">Kind</span> { <span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-></span> <span class="ident">Kind</span> { <span class="ident">Kind</span>::<span class="ident">A</span> } }<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0A%23!%5Ballow(dead_code)%5D%0Afn%20main()%20%7B%0Aenum%20Kind%20%7B%0A%20%20%20%20A%2C%0A%20%20%20%20B%2C%0A%20%20%20%20C%2C%0A%7D%0A%0Aimpl%20Default%20for%20Kind%20%7B%0A%20%20%20%20fn%20default()%20-%3E%20Kind%20%7B%20Kind%3A%3AA%20%7D%0A%7D%0A%7D">Run</a></pre> <h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1> <pre class="rust rust-example-rendered"> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Default</span>)]</span> <span class="kw">struct</span> <span class="ident">SomeOptions</span> { <span class="ident">foo</span>: <span class="ident">i32</span>, <span class="ident">bar</span>: <span class="ident">f32</span>, }<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0A%23%5Ballow(dead_code)%5D%0A%23%5Bderive(Default)%5D%0Astruct%20SomeOptions%20%7B%0A%20%20%20%20foo%3A%20i32%2C%0A%20%20%20%20bar%3A%20f32%2C%0A%7D%0A%7D">Run</a></pre> </div> <h2 id='required-methods' class='small-section-header'> Required Methods<a href='#required-methods' class='anchor'></a> </h2> <div class='methods'> <h3 id='tymethod.default' class='method'><span id='default.v' class='invisible'><code>fn <a href='#tymethod.default' class='fnname'>default</a>() -> Self</code></span></h3><div class='docblock'><p>Returns the "default value" for a type.</p> <p>Default values are often some kind of initial value, identity value, or anything else that may make sense as a default.</p> <h1 id="examples-1" class="section-header"><a href="#examples-1">Examples</a></h1> <p>Using built-in default values:</p> <pre class="rust rust-example-rendered"> <span class="kw">let</span> <span class="ident">i</span>: <span class="ident">i8</span> <span class="op">=</span> <span class="ident">Default</span>::<span class="ident">default</span>(); <span class="kw">let</span> (<span class="ident">x</span>, <span class="ident">y</span>): (<span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>, <span class="ident">f64</span>) <span class="op">=</span> <span class="ident">Default</span>::<span class="ident">default</span>(); <span class="kw">let</span> (<span class="ident">a</span>, <span class="ident">b</span>, (<span class="ident">c</span>, <span class="ident">d</span>)): (<span class="ident">i32</span>, <span class="ident">u32</span>, (<span class="ident">bool</span>, <span class="ident">bool</span>)) <span class="op">=</span> <span class="ident">Default</span>::<span class="ident">default</span>();<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Alet%20i%3A%20i8%20%3D%20Default%3A%3Adefault()%3B%0Alet%20(x%2C%20y)%3A%20(Option%3CString%3E%2C%20f64)%20%3D%20Default%3A%3Adefault()%3B%0Alet%20(a%2C%20b%2C%20(c%2C%20d))%3A%20(i32%2C%20u32%2C%20(bool%2C%20bool))%20%3D%20Default%3A%3Adefault()%3B%0A%7D">Run</a></pre> <p>Making your own:</p> <pre class="rust rust-example-rendered"> <span class="kw">enum</span> <span class="ident">Kind</span> { <span class="ident">A</span>, <span class="ident">B</span>, <span class="ident">C</span>, } <span class="kw">impl</span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">Kind</span> { <span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-></span> <span class="ident">Kind</span> { <span class="ident">Kind</span>::<span class="ident">A</span> } }<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0A%23%5Ballow(dead_code)%5D%0Aenum%20Kind%20%7B%0A%20%20%20%20A%2C%0A%20%20%20%20B%2C%0A%20%20%20%20C%2C%0A%7D%0A%0Aimpl%20Default%20for%20Kind%20%7B%0A%20%20%20%20fn%20default()%20-%3E%20Kind%20%7B%20Kind%3A%3AA%20%7D%0A%7D%0A%7D">Run</a></pre> </div></div> <h2 id='implementors' class='small-section-header'> Implementors<a href='#implementors' class='anchor'></a> </h2> <ul class='item-list' id='implementors-list'> <li><div class='out-of-band'><a class='srclink' href='../../src/core/num/mod.rs.html#45' title='goto source code'>[src]</a></div><code>impl<T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>> Default for <a class="struct" href="../../core/num/struct.Wrapping.html" title="struct core::num::Wrapping">Wrapping</a><T></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/mem.rs.html#1040-1044' title='goto source code'>[src]</a></div><code>impl<T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>> Default for <a class="union" href="../../core/mem/union.ManuallyDrop.html" title="union core::mem::ManuallyDrop">ManuallyDrop</a><T></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/marker.rs.html#397-401' title='goto source code'>[src]</a></div><code>impl<T: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>> Default for <a class="struct" href="../../core/marker/struct.PhantomData.html" title="struct core::marker::PhantomData">PhantomData</a><T></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/default.rs.html#131-135' title='goto source code'>[src]</a></div><code>impl Default for ()</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/default.rs.html#131-135' title='goto source code'>[src]</a></div><code>impl Default for bool</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/default.rs.html#131-135' title='goto source code'>[src]</a></div><code>impl Default for char</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/default.rs.html#131-135' title='goto source code'>[src]</a></div><code>impl Default for usize</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/default.rs.html#131-135' title='goto source code'>[src]</a></div><code>impl Default for u8</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/default.rs.html#131-135' title='goto source code'>[src]</a></div><code>impl Default for u16</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/default.rs.html#131-135' title='goto source code'>[src]</a></div><code>impl Default for u32</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/default.rs.html#131-135' title='goto source code'>[src]</a></div><code>impl Default for u64</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/default.rs.html#131-135' title='goto source code'>[src]</a></div><code>impl Default for u128</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/default.rs.html#131-135' title='goto source code'>[src]</a></div><code>impl Default for isize</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/default.rs.html#131-135' title='goto source code'>[src]</a></div><code>impl Default for i8</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/default.rs.html#131-135' title='goto source code'>[src]</a></div><code>impl Default for i16</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/default.rs.html#131-135' title='goto source code'>[src]</a></div><code>impl Default for i32</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/default.rs.html#131-135' title='goto source code'>[src]</a></div><code>impl Default for i64</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/default.rs.html#131-135' title='goto source code'>[src]</a></div><code>impl Default for i128</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/default.rs.html#131-135' title='goto source code'>[src]</a></div><code>impl Default for f32</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/default.rs.html#131-135' title='goto source code'>[src]</a></div><code>impl Default for f64</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 32] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 31] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 30] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 29] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 28] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 27] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 26] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 25] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 24] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 23] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 22] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 21] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 20] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 19] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 18] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 17] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 16] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 15] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 14] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 13] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 12] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 11] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 10] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 9] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 8] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 7] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 6] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 5] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 4] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 3] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 2] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#272-276' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 1] <span class="where fmt-newline">where<br> T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, </span></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/array.rs.html#281-283' title='goto source code'>[src]</a></div><code>impl<T> Default for [T; 0]</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/sync/atomic.rs.html#132-137' title='goto source code'>[src]</a></div><code>impl Default for <a class="struct" href="../../core/sync/atomic/struct.AtomicBool.html" title="struct core::sync::atomic::AtomicBool">AtomicBool</a></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/sync/atomic.rs.html#155-160' title='goto source code'>[src]</a></div><code>impl<T> Default for <a class="struct" href="../../core/sync/atomic/struct.AtomicPtr.html" title="struct core::sync::atomic::AtomicPtr">AtomicPtr</a><T></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/sync/atomic.rs.html#977-981' title='goto source code'>[src]</a></div><code>impl Default for <a class="struct" href="../../core/sync/atomic/struct.AtomicI8.html" title="struct core::sync::atomic::AtomicI8">AtomicI8</a></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/sync/atomic.rs.html#977-981' title='goto source code'>[src]</a></div><code>impl Default for <a class="struct" href="../../core/sync/atomic/struct.AtomicU8.html" title="struct core::sync::atomic::AtomicU8">AtomicU8</a></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/sync/atomic.rs.html#977-981' title='goto source code'>[src]</a></div><code>impl Default for <a class="struct" href="../../core/sync/atomic/struct.AtomicI16.html" title="struct core::sync::atomic::AtomicI16">AtomicI16</a></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/sync/atomic.rs.html#977-981' title='goto source code'>[src]</a></div><code>impl Default for <a class="struct" href="../../core/sync/atomic/struct.AtomicU16.html" title="struct core::sync::atomic::AtomicU16">AtomicU16</a></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/sync/atomic.rs.html#977-981' title='goto source code'>[src]</a></div><code>impl Default for <a class="struct" href="../../core/sync/atomic/struct.AtomicI32.html" title="struct core::sync::atomic::AtomicI32">AtomicI32</a></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/sync/atomic.rs.html#977-981' title='goto source code'>[src]</a></div><code>impl Default for <a class="struct" href="../../core/sync/atomic/struct.AtomicU32.html" title="struct core::sync::atomic::AtomicU32">AtomicU32</a></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/sync/atomic.rs.html#977-981' title='goto source code'>[src]</a></div><code>impl Default for <a class="struct" href="../../core/sync/atomic/struct.AtomicI64.html" title="struct core::sync::atomic::AtomicI64">AtomicI64</a></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/sync/atomic.rs.html#977-981' title='goto source code'>[src]</a></div><code>impl Default for <a class="struct" href="../../core/sync/atomic/struct.AtomicU64.html" title="struct core::sync::atomic::AtomicU64">AtomicU64</a></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/sync/atomic.rs.html#977-981' title='goto source code'>[src]</a></div><code>impl Default for <a class="struct" href="../../core/sync/atomic/struct.AtomicIsize.html" title="struct core::sync::atomic::AtomicIsize">AtomicIsize</a></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/sync/atomic.rs.html#977-981' title='goto source code'>[src]</a></div><code>impl Default for <a class="struct" href="../../core/sync/atomic/struct.AtomicUsize.html" title="struct core::sync::atomic::AtomicUsize">AtomicUsize</a></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/cell.rs.html#259-265' title='goto source code'>[src]</a></div><code>impl<T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>> Default for <a class="struct" href="../../core/cell/struct.Cell.html" title="struct core::cell::Cell">Cell</a><T></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/cell.rs.html#873-879' title='goto source code'>[src]</a></div><code>impl<T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>> Default for <a class="struct" href="../../core/cell/struct.RefCell.html" title="struct core::cell::RefCell">RefCell</a><T></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/cell.rs.html#1264-1269' title='goto source code'>[src]</a></div><code>impl<T: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>> Default for <a class="struct" href="../../core/cell/struct.UnsafeCell.html" title="struct core::cell::UnsafeCell">UnsafeCell</a><T></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/iter/sources.rs.html#162-166' title='goto source code'>[src]</a></div><code>impl<T> Default for <a class="struct" href="../../core/iter/struct.Empty.html" title="struct core::iter::Empty">Empty</a><T></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/option.rs.html#926-932' title='goto source code'>[src]</a></div><code>impl<T> Default for <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><T></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/slice/mod.rs.html#1123-1126' title='goto source code'>[src]</a></div><code>impl<'a, T> Default for &'a [T]</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/slice/mod.rs.html#1129-1132' title='goto source code'>[src]</a></div><code>impl<'a, T> Default for &'a mut [T]</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/str/mod.rs.html#2527-2530' title='goto source code'>[src]</a></div><code>impl<'a> Default for &'a str</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/hash/sip.rs.html#29' title='goto source code'>[src]</a></div><code>impl Default for <a class="struct" href="../../core/hash/struct.SipHasher13.html" title="struct core::hash::SipHasher13">SipHasher13</a></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/hash/sip.rs.html#40' title='goto source code'>[src]</a></div><code>impl Default for <a class="struct" href="../../core/hash/struct.SipHasher24.html" title="struct core::hash::SipHasher24">SipHasher24</a></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/hash/sip.rs.html#60' title='goto source code'>[src]</a></div><code>impl Default for <a class="struct" href="../../core/hash/struct.SipHasher.html" title="struct core::hash::SipHasher">SipHasher</a></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/hash/mod.rs.html#538-542' title='goto source code'>[src]</a></div><code>impl<H> Default for <a class="struct" href="../../core/hash/struct.BuildHasherDefault.html" title="struct core::hash::BuildHasherDefault">BuildHasherDefault</a><H></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/fmt/mod.rs.html#104' title='goto source code'>[src]</a></div><code>impl Default for <a class="struct" href="../../core/fmt/struct.Error.html" title="struct core::fmt::Error">Error</a></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/time.rs.html#62' title='goto source code'>[src]</a></div><code>impl Default for <a class="struct" href="../../core/time/struct.Duration.html" title="struct core::time::Duration">Duration</a></code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/tuple.rs.html#73-78' title='goto source code'>[src]</a></div><code>impl<A: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>> Default for (A,)</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/tuple.rs.html#73-78' title='goto source code'>[src]</a></div><code>impl<A: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, B: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>> Default for (A, B)</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/tuple.rs.html#73-78' title='goto source code'>[src]</a></div><code>impl<A: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, B: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, C: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>> Default for (A, B, C)</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/tuple.rs.html#73-78' title='goto source code'>[src]</a></div><code>impl<A: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, B: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, C: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, D: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>> Default for (A, B, C, D)</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/tuple.rs.html#73-78' title='goto source code'>[src]</a></div><code>impl<A: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, B: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, C: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, D: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, E: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>> Default for (A, B, C, D, E)</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/tuple.rs.html#73-78' title='goto source code'>[src]</a></div><code>impl<A: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, B: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, C: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, D: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, E: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, F: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>> Default for (A, B, C, D, E, F)</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/tuple.rs.html#73-78' title='goto source code'>[src]</a></div><code>impl<A: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, B: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, C: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, D: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, E: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, F: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, G: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>> Default for (A, B, C, D, E, F, G)</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/tuple.rs.html#73-78' title='goto source code'>[src]</a></div><code>impl<A: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, B: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, C: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, D: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, E: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, F: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, G: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, H: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>> Default for (A, B, C, D, E, F, G, H)</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/tuple.rs.html#73-78' title='goto source code'>[src]</a></div><code>impl<A: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, B: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, C: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, D: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, E: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, F: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, G: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, H: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, I: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>> Default for (A, B, C, D, E, F, G, H, I)</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/tuple.rs.html#73-78' title='goto source code'>[src]</a></div><code>impl<A: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, B: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, C: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, D: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, E: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, F: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, G: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, H: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, I: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, J: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>> Default for (A, B, C, D, E, F, G, H, I, J)</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/tuple.rs.html#73-78' title='goto source code'>[src]</a></div><code>impl<A: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, B: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, C: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, D: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, E: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, F: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, G: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, H: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, I: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, J: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, K: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>> Default for (A, B, C, D, E, F, G, H, I, J, K)</code></li> <li><div class='out-of-band'><a class='srclink' href='../../src/core/tuple.rs.html#73-78' title='goto source code'>[src]</a></div><code>impl<A: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, B: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, C: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, D: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, E: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, F: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, G: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, H: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, I: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, J: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, K: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>, L: <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a>> Default for (A, B, C, D, E, F, G, H, I, J, K, L)</code></li> </ul><script type="text/javascript" async src="../../implementors/core/default/trait.Default.js"> </script></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 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