<!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 `Step` trait in crate `core`."><meta name="keywords" content="rust, rustlang, rust-lang, Step"><title>core::iter::Step - 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="../../light.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 Step</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.steps_between">steps_between</a><a href="#tymethod.replace_one">replace_one</a><a href="#tymethod.replace_zero">replace_zero</a><a href="#tymethod.add_one">add_one</a><a href="#tymethod.sub_one">sub_one</a><a href="#tymethod.add_usize">add_usize</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'>iter</a></p><script>window.sidebarCurrent = {name: 'Step', 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"><a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></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'>iter</a>::<wbr><a class="trait" href=''>Step</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version '></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/iter/range.rs.html#25-47' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust trait'>pub trait Step: <a class="trait" href="../../core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> + <a class="trait" href="../../core/cmp/trait.PartialOrd.html" title="trait core::cmp::PartialOrd">PartialOrd</a> + <a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> {
fn <a href='#tymethod.steps_between' class='fnname'>steps_between</a>(start: &Self, end: &Self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><usize>;
<div class='item-spacer'></div> fn <a href='#tymethod.replace_one' class='fnname'>replace_one</a>(&mut self) -> Self;
<div class='item-spacer'></div> fn <a href='#tymethod.replace_zero' class='fnname'>replace_zero</a>(&mut self) -> Self;
<div class='item-spacer'></div> fn <a href='#tymethod.add_one' class='fnname'>add_one</a>(&self) -> Self;
<div class='item-spacer'></div> fn <a href='#tymethod.sub_one' class='fnname'>sub_one</a>(&self) -> Self;
<div class='item-spacer'></div> fn <a href='#tymethod.add_usize' class='fnname'>add_usize</a>(&self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self>;
}</pre></div><div class='stability'><div class='stab unstable'><details><summary><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>step_trait </code><a href="https://github.com/rust-lang/rust/issues/42168">#42168</a>)</summary><p>likely to be replaced by finer-grained traits</p>
</details></div></div><div class='docblock'><p>Objects that can be stepped over in both directions.</p>
<p>The <code>steps_between</code> function provides a way to efficiently compare
two <code>Step</code> objects.</p>
</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.steps_between' class='method'><span id='steps_between.v' class='invisible'><code>fn <a href='#tymethod.steps_between' class='fnname'>steps_between</a>(start: &Self, end: &Self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><usize></code></span></h3><div class='stability'><div class='stab unstable'><details><summary><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>step_trait </code><a href="https://github.com/rust-lang/rust/issues/42168">#42168</a>)</summary><p>likely to be replaced by finer-grained traits</p>
</details></div></div><div class='docblock'><p>Returns the number of steps between two step objects. The count is
inclusive of <code>start</code> and exclusive of <code>end</code>.</p>
<p>Returns <code>None</code> if it is not possible to calculate <code>steps_between</code>
without overflow.</p>
</div><h3 id='tymethod.replace_one' class='method'><span id='replace_one.v' class='invisible'><code>fn <a href='#tymethod.replace_one' class='fnname'>replace_one</a>(&mut self) -> Self</code></span></h3><div class='stability'><div class='stab unstable'><details><summary><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>step_trait </code><a href="https://github.com/rust-lang/rust/issues/42168">#42168</a>)</summary><p>likely to be replaced by finer-grained traits</p>
</details></div></div><div class='docblock'><p>Replaces this step with <code>1</code>, returning itself</p>
</div><h3 id='tymethod.replace_zero' class='method'><span id='replace_zero.v' class='invisible'><code>fn <a href='#tymethod.replace_zero' class='fnname'>replace_zero</a>(&mut self) -> Self</code></span></h3><div class='stability'><div class='stab unstable'><details><summary><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>step_trait </code><a href="https://github.com/rust-lang/rust/issues/42168">#42168</a>)</summary><p>likely to be replaced by finer-grained traits</p>
</details></div></div><div class='docblock'><p>Replaces this step with <code>0</code>, returning itself</p>
</div><h3 id='tymethod.add_one' class='method'><span id='add_one.v' class='invisible'><code>fn <a href='#tymethod.add_one' class='fnname'>add_one</a>(&self) -> Self</code></span></h3><div class='stability'><div class='stab unstable'><details><summary><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>step_trait </code><a href="https://github.com/rust-lang/rust/issues/42168">#42168</a>)</summary><p>likely to be replaced by finer-grained traits</p>
</details></div></div><div class='docblock'><p>Adds one to this step, returning the result</p>
</div><h3 id='tymethod.sub_one' class='method'><span id='sub_one.v' class='invisible'><code>fn <a href='#tymethod.sub_one' class='fnname'>sub_one</a>(&self) -> Self</code></span></h3><div class='stability'><div class='stab unstable'><details><summary><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>step_trait </code><a href="https://github.com/rust-lang/rust/issues/42168">#42168</a>)</summary><p>likely to be replaced by finer-grained traits</p>
</details></div></div><div class='docblock'><p>Subtracts one to this step, returning the result</p>
</div><h3 id='tymethod.add_usize' class='method'><span id='add_usize.v' class='invisible'><code>fn <a href='#tymethod.add_usize' class='fnname'>add_usize</a>(&self, n: usize) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span></h3><div class='stability'><div class='stab unstable'><details><summary><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>step_trait </code><a href="https://github.com/rust-lang/rust/issues/42168">#42168</a>)</summary><p>likely to be replaced by finer-grained traits</p>
</details></div></div><div class='docblock'><p>Add an usize, returning None on overflow</p>
</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><table class='table-display'><tbody><tr><td><code>impl Step for usize</code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/range.rs.html#79-101' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl Step for u8</code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/range.rs.html#79-101' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl Step for u16</code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/range.rs.html#79-101' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl Step for u32</code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/range.rs.html#79-101' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl Step for isize</code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/range.rs.html#109-143' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl Step for i8</code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/range.rs.html#109-143' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl Step for i16</code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/range.rs.html#109-143' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl Step for i32</code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/range.rs.html#109-143' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl Step for u64</code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/range.rs.html#79-101' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl Step for i64</code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/range.rs.html#109-143' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl Step for u128</code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/range.rs.html#152-164' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl Step for i128</code><td><div class='out-of-band'><a class='srclink' href='../../src/core/iter/range.rs.html#152-164' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
</ul><script type="text/javascript">window.inlined_types=new Set([]);</script><script type="text/javascript" async
src="../../implementors/core/iter/trait.Step.js">
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