<!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 `Try` trait in crate `std`."><meta name="keywords" content="rust, rustlang, rust-lang, Try"><title>std::ops::Try - 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='../../std/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 Try</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#associated-types">Associated Types</a><div class="sidebar-links"><a href="#associatedtype.Ok">Ok</a><a href="#associatedtype.Error">Error</a></div><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.into_result">into_result</a><a href="#tymethod.from_error">from_error</a><a href="#tymethod.from_ok">from_ok</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>std</a>::<wbr><a href='index.html'>ops</a></p><script>window.sidebarCurrent = {name: 'Try', 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'>std</a>::<wbr><a href='index.html'>ops</a>::<wbr><a class="trait" href=''>Try</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/ops/try.rs.html#32-61' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust trait'>pub trait Try {
type <a href='#associatedtype.Ok' class="type">Ok</a>;
type <a href='#associatedtype.Error' class="type">Error</a>;
fn <a href='#tymethod.into_result' class='fnname'>into_result</a>(self) -> <a class="enum" href="../../std/result/enum.Result.html" title="enum std::result::Result">Result</a><Self::<a class="type" href="../../std/ops/trait.Try.html#associatedtype.Ok" title="type std::ops::Try::Ok">Ok</a>, Self::<a class="type" href="../../std/ops/trait.Try.html#associatedtype.Error" title="type std::ops::Try::Error">Error</a>>;
<div class='item-spacer'></div> fn <a href='#tymethod.from_error' class='fnname'>from_error</a>(v: Self::<a class="type" href="../../std/ops/trait.Try.html#associatedtype.Error" title="type std::ops::Try::Error">Error</a>) -> Self;
<div class='item-spacer'></div> fn <a href='#tymethod.from_ok' class='fnname'>from_ok</a>(v: Self::<a class="type" href="../../std/ops/trait.Try.html#associatedtype.Ok" title="type std::ops::Try::Ok">Ok</a>) -> Self;
}</pre></div><div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>try_trait </code><a href="https://github.com/rust-lang/rust/issues/42327">#42327</a>)</div></div><div class='docblock'><p>A trait for customizing the behavior of the <code>?</code> operator.</p>
<p>A type implementing <code>Try</code> is one that has a canonical way to view it
in terms of a success/failure dichotomy. This trait allows both
extracting those success or failure values from an existing instance and
creating a new instance from a success or failure value.</p>
</div>
<h2 id='associated-types' class='small-section-header'>
Associated Types<a href='#associated-types' class='anchor'></a>
</h2>
<div class='methods'>
<h3 id='associatedtype.Ok' class='method'><span id='Ok.t' class='invisible'><code>type <a href='#associatedtype.Ok' class="type">Ok</a></code></span></h3><div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>try_trait </code><a href="https://github.com/rust-lang/rust/issues/42327">#42327</a>)</div></div><div class='docblock'><p>The type of this value when viewed as successful.</p>
</div><h3 id='associatedtype.Error' class='method'><span id='Error.t' class='invisible'><code>type <a href='#associatedtype.Error' class="type">Error</a></code></span></h3><div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>try_trait </code><a href="https://github.com/rust-lang/rust/issues/42327">#42327</a>)</div></div><div class='docblock'><p>The type of this value when viewed as failed.</p>
</div></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.into_result' class='method'><span id='into_result.v' class='invisible'><code>fn <a href='#tymethod.into_result' class='fnname'>into_result</a>(self) -> <a class="enum" href="../../std/result/enum.Result.html" title="enum std::result::Result">Result</a><Self::<a class="type" href="../../std/ops/trait.Try.html#associatedtype.Ok" title="type std::ops::Try::Ok">Ok</a>, Self::<a class="type" href="../../std/ops/trait.Try.html#associatedtype.Error" title="type std::ops::Try::Error">Error</a>></code></span></h3><div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>try_trait </code><a href="https://github.com/rust-lang/rust/issues/42327">#42327</a>)</div></div><div class='docblock'><p>Applies the "?" operator. A return of <code>Ok(t)</code> means that the
execution should continue normally, and the result of <code>?</code> is the
value <code>t</code>. A return of <code>Err(e)</code> means that execution should branch
to the innermost enclosing <code>catch</code>, or return from the function.</p>
<p>If an <code>Err(e)</code> result is returned, the value <code>e</code> will be "wrapped"
in the return type of the enclosing scope (which must itself implement
<code>Try</code>). Specifically, the value <code>X::from_error(From::from(e))</code>
is returned, where <code>X</code> is the return type of the enclosing function.</p>
</div><h3 id='tymethod.from_error' class='method'><span id='from_error.v' class='invisible'><code>fn <a href='#tymethod.from_error' class='fnname'>from_error</a>(v: Self::<a class="type" href="../../std/ops/trait.Try.html#associatedtype.Error" title="type std::ops::Try::Error">Error</a>) -> Self</code></span></h3><div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>try_trait </code><a href="https://github.com/rust-lang/rust/issues/42327">#42327</a>)</div></div><div class='docblock'><p>Wrap an error value to construct the composite result. For example,
<code>Result::Err(x)</code> and <code>Result::from_error(x)</code> are equivalent.</p>
</div><h3 id='tymethod.from_ok' class='method'><span id='from_ok.v' class='invisible'><code>fn <a href='#tymethod.from_ok' class='fnname'>from_ok</a>(v: Self::<a class="type" href="../../std/ops/trait.Try.html#associatedtype.Ok" title="type std::ops::Try::Ok">Ok</a>) -> Self</code></span></h3><div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>try_trait </code><a href="https://github.com/rust-lang/rust/issues/42327">#42327</a>)</div></div><div class='docblock'><p>Wrap an OK value to construct the composite result. For example,
<code>Result::Ok(x)</code> and <code>Result::from_ok(x)</code> are equivalent.</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<T, E> Try for <a class="enum" href="../../std/result/enum.Result.html" title="enum std::result::Result">Result</a><T, E><span class="where fmt-newline"> type <a href='#associatedtype.Ok' class="type">Ok</a> = T;</span><span class="where fmt-newline"> type <a href='#associatedtype.Error' class="type">Error</a> = E;</span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/result.rs.html#1196-1211' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl<T> Try for <a class="enum" href="../../std/option/enum.Option.html" title="enum std::option::Option">Option</a><T><span class="where fmt-newline"> type <a href='#associatedtype.Ok' class="type">Ok</a> = T;</span><span class="where fmt-newline"> type <a href='#associatedtype.Error' class="type">Error</a> = <a class="struct" href="../../std/option/struct.NoneError.html" title="struct std::option::NoneError">NoneError</a>;</span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/option.rs.html#1221-1236' 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
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