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<p class='location'>Trait Default</p><div class="block items"><ul><li><a href="#required-methods">Required Methods</a></li><li><a href="#implementors">Implementors</a></li></ul></div><p class='location'><a href='../index.html'>std</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>
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<h1 class='fqn'><span class='in-band'>Trait <a href='../index.html'>std</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 {
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=fn%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(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(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(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=fn%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'>Required Methods</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=fn%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=fn%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'>Implementors</h2>
<ul class='item-list' id='implementors-list'>
<li><code>impl<T> Default for <a class="struct" href="../../std/rc/struct.Rc.html" title="struct std::rc::Rc">Rc</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl Default for <a class="struct" href="../../std/boxed/struct.Box.html" title="struct std::boxed::Box">Box</a><<a class="primitive" href="../primitive.str.html">str</a>></code></li>
<li><code>impl<T> Default for <a class="struct" href="../../std/boxed/struct.Box.html" title="struct std::boxed::Box">Box</a><<a class="primitive" href="../primitive.slice.html">[</a>T<a class="primitive" href="../primitive.slice.html">]</a>></code></li>
<li><code>impl<T> Default for std::rc::<a class="struct" href="../../std/rc/struct.Weak.html" title="struct std::rc::Weak">Weak</a><T></code></li>
<li><code>impl<T> Default for <a class="struct" href="../../std/boxed/struct.Box.html" title="struct std::boxed::Box">Box</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="struct" href="../../std/sync/struct.Arc.html" title="struct std::sync::Arc">Arc</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for std::sync::<a class="struct" href="../../std/sync/struct.Weak.html" title="struct std::sync::Weak">Weak</a><T></code></li>
<li><code>impl<T> Default for <a class="struct" href="../../std/vec/struct.Vec.html" title="struct std::vec::Vec">Vec</a><T></code></li>
<li><code>impl<K, V> Default for <a class="struct" href="../../std/collections/btree_map/struct.BTreeMap.html" title="struct std::collections::btree_map::BTreeMap">BTreeMap</a><K, V> <span class="where fmt-newline">where<br> K: <a class="trait" href="../../std/cmp/trait.Ord.html" title="trait std::cmp::Ord">Ord</a>, </span></code></li>
<li><code>impl<T> Default for <a class="struct" href="../../std/collections/vec_deque/struct.VecDeque.html" title="struct std::collections::vec_deque::VecDeque">VecDeque</a><T></code></li>
<li><code>impl<T> Default for <a class="struct" href="../../std/collections/linked_list/struct.LinkedList.html" title="struct std::collections::linked_list::LinkedList">LinkedList</a><T></code></li>
<li><code>impl Default for <a class="struct" href="../../std/string/struct.String.html" title="struct std::string::String">String</a></code></li>
<li><code>impl<'a, B> Default for <a class="enum" href="../../std/borrow/enum.Cow.html" title="enum std::borrow::Cow">Cow</a><'a, B> <span class="where fmt-newline">where<br> B: <a class="trait" href="../../std/borrow/trait.ToOwned.html" title="trait std::borrow::ToOwned">ToOwned</a> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>,<br> <B as <a class="trait" href="../../std/borrow/trait.ToOwned.html" title="trait std::borrow::ToOwned">ToOwned</a>>::<a class="trait" href="../../std/borrow/trait.ToOwned.html" title="trait std::borrow::ToOwned">Owned</a>: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="struct" href="../../std/collections/binary_heap/struct.BinaryHeap.html" title="struct std::collections::binary_heap::BinaryHeap">BinaryHeap</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/cmp/trait.Ord.html" title="trait std::cmp::Ord">Ord</a>, </span></code></li>
<li><code>impl<T> Default for <a class="struct" href="../../std/collections/btree_set/struct.BTreeSet.html" title="struct std::collections::btree_set::BTreeSet">BTreeSet</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/cmp/trait.Ord.html" title="trait std::cmp::Ord">Ord</a>, </span></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 26]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl Default for <a class="primitive" href="../primitive.usize.html">usize</a></code></li>
<li><code>impl<A> Default for <a class="primitive" href="../primitive.tuple.html">(</a>A<a class="primitive" href="../primitive.tuple.html">,)</a> <span class="where fmt-newline">where<br> A: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<A, B, C, D, E, F, G, H, I, J, K, L> Default for <a class="primitive" href="../primitive.tuple.html">(</a>A, B, C, D, E, F, G, H, I, J, K, L<a class="primitive" href="../primitive.tuple.html">)</a> <span class="where fmt-newline">where<br> A: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> B: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> C: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> D: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> E: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> F: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> G: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> H: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> I: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> J: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> K: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> L: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 22]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="enum" href="../../std/option/enum.Option.html" title="enum std::option::Option">Option</a><T></code></li>
<li><code>impl Default for <a class="primitive" href="../primitive.u64.html">u64</a></code></li>
<li><code>impl Default for <a class="primitive" href="../primitive.isize.html">isize</a></code></li>
<li><code>impl Default for <a class="primitive" href="../primitive.bool.html">bool</a></code></li>
<li><code>impl<T> Default for <a class="struct" href="../../std/num/struct.Wrapping.html" title="struct std::num::Wrapping">Wrapping</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<H> Default for <a class="struct" href="../../std/hash/struct.BuildHasherDefault.html" title="struct std::hash::BuildHasherDefault">BuildHasherDefault</a><H></code></li>
<li><code>impl<T> Default for <a class="struct" href="../../std/marker/struct.PhantomData.html" title="struct std::marker::PhantomData">PhantomData</a><T> <span class="where fmt-newline">where<br> T: ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></code></li>
<li><code>impl<A, B, C, D, E, F, G> Default for <a class="primitive" href="../primitive.tuple.html">(</a>A, B, C, D, E, F, G<a class="primitive" href="../primitive.tuple.html">)</a> <span class="where fmt-newline">where<br> A: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> B: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> C: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> D: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> E: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> F: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> G: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 23]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<A, B, C, D, E> Default for <a class="primitive" href="../primitive.tuple.html">(</a>A, B, C, D, E<a class="primitive" href="../primitive.tuple.html">)</a> <span class="where fmt-newline">where<br> A: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> B: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> C: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> D: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> E: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl Default for <a class="primitive" href="../primitive.f64.html">f64</a></code></li>
<li><code>impl Default for <a class="struct" href="../../std/sync/atomic/struct.AtomicU16.html" title="struct std::sync::atomic::AtomicU16">AtomicU16</a></code></li>
<li><code>impl<A, B, C, D, E, F, G, H, I, J, K> Default for <a class="primitive" href="../primitive.tuple.html">(</a>A, B, C, D, E, F, G, H, I, J, K<a class="primitive" href="../primitive.tuple.html">)</a> <span class="where fmt-newline">where<br> A: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> B: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> C: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> D: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> E: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> F: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> G: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> H: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> I: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> J: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> K: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 29]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl Default for <a class="struct" href="../../std/sync/atomic/struct.AtomicBool.html" title="struct std::sync::atomic::AtomicBool">AtomicBool</a></code></li>
<li><code>impl Default for <a class="primitive" href="../primitive.u16.html">u16</a></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 3]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl Default for <a class="primitive" href="../primitive.char.html">char</a></code></li>
<li><code>impl<A, B, C, D, E, F, G, H, I> Default for <a class="primitive" href="../primitive.tuple.html">(</a>A, B, C, D, E, F, G, H, I<a class="primitive" href="../primitive.tuple.html">)</a> <span class="where fmt-newline">where<br> A: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> B: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> C: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> D: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> E: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> F: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> G: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> H: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> I: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl Default for <a class="primitive" href="../primitive.i8.html">i8</a></code></li>
<li><code>impl Default for <a class="primitive" href="../primitive.u8.html">u8</a></code></li>
<li><code>impl Default for <a class="struct" href="../../std/sync/atomic/struct.AtomicUsize.html" title="struct std::sync::atomic::AtomicUsize">AtomicUsize</a></code></li>
<li><code>impl Default for <a class="struct" href="../../std/sync/atomic/struct.AtomicU8.html" title="struct std::sync::atomic::AtomicU8">AtomicU8</a></code></li>
<li><code>impl Default for <a class="struct" href="../../std/sync/atomic/struct.AtomicI16.html" title="struct std::sync::atomic::AtomicI16">AtomicI16</a></code></li>
<li><code>impl Default for <a class="primitive" href="../primitive.i32.html">i32</a></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 30]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl Default for <a class="struct" href="../../std/sync/atomic/struct.AtomicI64.html" title="struct std::sync::atomic::AtomicI64">AtomicI64</a></code></li>
<li><code>impl<T> Default for <a class="struct" href="../../std/cell/struct.UnsafeCell.html" title="struct std::cell::UnsafeCell">UnsafeCell</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<A, B> Default for <a class="primitive" href="../primitive.tuple.html">(</a>A, B<a class="primitive" href="../primitive.tuple.html">)</a> <span class="where fmt-newline">where<br> A: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> B: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl Default for <a class="primitive" href="../primitive.f32.html">f32</a></code></li>
<li><code>impl Default for <a class="primitive" href="../primitive.u128.html">u128</a></code></li>
<li><code>impl<A, B, C, D> Default for <a class="primitive" href="../primitive.tuple.html">(</a>A, B, C, D<a class="primitive" href="../primitive.tuple.html">)</a> <span class="where fmt-newline">where<br> A: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> B: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> C: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> D: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 31]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<A, B, C, D, E, F, G, H> Default for <a class="primitive" href="../primitive.tuple.html">(</a>A, B, C, D, E, F, G, H<a class="primitive" href="../primitive.tuple.html">)</a> <span class="where fmt-newline">where<br> A: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> B: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> C: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> D: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> E: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> F: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> G: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> H: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 1]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="struct" href="../../std/iter/struct.Empty.html" title="struct std::iter::Empty">Empty</a><T></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 8]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 20]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 11]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 9]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 10]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 19]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 17]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 28]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 15]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl Default for <a class="struct" href="../../std/sync/atomic/struct.AtomicU32.html" title="struct std::sync::atomic::AtomicU32">AtomicU32</a></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 6]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 14]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 5]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 25]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="struct" href="../../std/cell/struct.RefCell.html" title="struct std::cell::RefCell">RefCell</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl Default for <a class="struct" href="../../std/hash/struct.SipHasher.html" title="struct std::hash::SipHasher">SipHasher</a></code></li>
<li><code>impl Default for <a class="primitive" href="../primitive.i128.html">i128</a></code></li>
<li><code>impl Default for <a class="struct" href="../../std/sync/atomic/struct.AtomicI32.html" title="struct std::sync::atomic::AtomicI32">AtomicI32</a></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 27]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 7]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl Default for <a class="struct" href="../../std/sync/atomic/struct.AtomicIsize.html" title="struct std::sync::atomic::AtomicIsize">AtomicIsize</a></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 4]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 16]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 12]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 21]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl Default for <a class="struct" href="../../std/hash/struct.SipHasher24.html" title="struct std::hash::SipHasher24">SipHasher24</a></code></li>
<li><code>impl<A, B, C, D, E, F> Default for <a class="primitive" href="../primitive.tuple.html">(</a>A, B, C, D, E, F<a class="primitive" href="../primitive.tuple.html">)</a> <span class="where fmt-newline">where<br> A: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> B: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> C: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> D: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> E: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> F: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl Default for <a class="struct" href="../../std/sync/atomic/struct.AtomicU64.html" title="struct std::sync::atomic::AtomicU64">AtomicU64</a></code></li>
<li><code>impl<'a, T> Default for <a class="primitive" href="../primitive.slice.html">&'a [T]</a></code></li>
<li><code>impl Default for <a class="primitive" href="../primitive.tuple.html">()</a></code></li>
<li><code>impl Default for <a class="primitive" href="../primitive.u32.html">u32</a></code></li>
<li><code>impl<T> Default for <a class="struct" href="../../std/sync/atomic/struct.AtomicPtr.html" title="struct std::sync::atomic::AtomicPtr">AtomicPtr</a><T></code></li>
<li><code>impl Default for <a class="struct" href="../../std/hash/struct.SipHasher13.html" title="struct std::hash::SipHasher13">SipHasher13</a></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 18]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<'a, T> Default for <a class="primitive" href="../primitive.slice.html">&'a mut [T]</a></code></li>
<li><code>impl<A, B, C, D, E, F, G, H, I, J> Default for <a class="primitive" href="../primitive.tuple.html">(</a>A, B, C, D, E, F, G, H, I, J<a class="primitive" href="../primitive.tuple.html">)</a> <span class="where fmt-newline">where<br> A: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> B: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> C: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> D: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> E: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> F: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> G: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> H: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> I: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> J: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 24]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="struct" href="../../std/cell/struct.Cell.html" title="struct std::cell::Cell">Cell</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 32]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<'a> Default for &'a <a class="primitive" href="../primitive.str.html">str</a></code></li>
<li><code>impl Default for <a class="struct" href="../../std/fmt/struct.Error.html" title="struct std::fmt::Error">Error</a></code></li>
<li><code>impl Default for <a class="primitive" href="../primitive.i64.html">i64</a></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 0]</a></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 13]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl Default for <a class="primitive" href="../primitive.i16.html">i16</a></code></li>
<li><code>impl Default for <a class="struct" href="../../std/sync/atomic/struct.AtomicI8.html" title="struct std::sync::atomic::AtomicI8">AtomicI8</a></code></li>
<li><code>impl<A, B, C> Default for <a class="primitive" href="../primitive.tuple.html">(</a>A, B, C<a class="primitive" href="../primitive.tuple.html">)</a> <span class="where fmt-newline">where<br> A: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> B: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>,<br> C: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<T> Default for <a class="primitive" href="../primitive.array.html">[</a>T<a class="primitive" href="../primitive.array.html">; 2]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl Default for <a class="struct" href="https://doc.rust-lang.org/nightly/rand/reseeding/struct.ReseedWithDefault.html" title="struct rand::reseeding::ReseedWithDefault">ReseedWithDefault</a></code></li>
<li><code>impl<K, V, S> Default for <a class="struct" href="../../std/collections/struct.HashMap.html" title="struct std::collections::HashMap">HashMap</a><K, V, S> <span class="where fmt-newline">where<br> K: <a class="trait" href="../../std/cmp/trait.Eq.html" title="trait std::cmp::Eq">Eq</a> + <a class="trait" href="../../std/hash/trait.Hash.html" title="trait std::hash::Hash">Hash</a>,<br> S: <a class="trait" href="../../std/hash/trait.BuildHasher.html" title="trait std::hash::BuildHasher">BuildHasher</a> + <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl Default for <a class="struct" href="../../std/collections/hash_map/struct.DefaultHasher.html" title="struct std::collections::hash_map::DefaultHasher">DefaultHasher</a></code></li>
<li><code>impl Default for <a class="struct" href="../../std/collections/hash_map/struct.RandomState.html" title="struct std::collections::hash_map::RandomState">RandomState</a></code></li>
<li><code>impl<T, S> Default for <a class="struct" href="../../std/collections/struct.HashSet.html" title="struct std::collections::HashSet">HashSet</a><T, S> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/cmp/trait.Eq.html" title="trait std::cmp::Eq">Eq</a> + <a class="trait" href="../../std/hash/trait.Hash.html" title="trait std::hash::Hash">Hash</a>,<br> S: <a class="trait" href="../../std/hash/trait.BuildHasher.html" title="trait std::hash::BuildHasher">BuildHasher</a> + <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>, </span></code></li>
<li><code>impl<'a> Default for &'a <a class="struct" href="../../std/ffi/struct.CStr.html" title="struct std::ffi::CStr">CStr</a></code></li>
<li><code>impl Default for <a class="struct" href="../../std/ffi/struct.CString.html" title="struct std::ffi::CString">CString</a></code></li>
<li><code>impl Default for <a class="struct" href="../../std/boxed/struct.Box.html" title="struct std::boxed::Box">Box</a><<a class="struct" href="../../std/ffi/struct.CStr.html" title="struct std::ffi::CStr">CStr</a>></code></li>
<li><code>impl Default for <a class="struct" href="../../std/ffi/struct.OsString.html" title="struct std::ffi::OsString">OsString</a></code></li>
<li><code>impl Default for <a class="struct" href="../../std/boxed/struct.Box.html" title="struct std::boxed::Box">Box</a><<a class="struct" href="../../std/ffi/struct.OsStr.html" title="struct std::ffi::OsStr">OsStr</a>></code></li>
<li><code>impl<'a> Default for &'a <a class="struct" href="../../std/ffi/struct.OsStr.html" title="struct std::ffi::OsStr">OsStr</a></code></li>
<li><code>impl Default for <a class="struct" href="../../std/path/struct.PathBuf.html" title="struct std::path::PathBuf">PathBuf</a></code></li>
<li><code>impl Default for <a class="struct" href="../../std/sync/struct.Condvar.html" title="struct std::sync::Condvar">Condvar</a></code></li>
<li><code>impl<T: ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a> + <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>> Default for <a class="struct" href="../../std/sync/struct.Mutex.html" title="struct std::sync::Mutex">Mutex</a><T></code></li>
<li><code>impl<T: <a class="trait" href="../../std/default/trait.Default.html" title="trait std::default::Default">Default</a>> Default for <a class="struct" href="../../std/sync/struct.RwLock.html" title="struct std::sync::RwLock">RwLock</a><T></code></li>
<li><code>impl Default for <a class="struct" href="../../std/time/struct.Duration.html" title="struct std::time::Duration">Duration</a></code></li>
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