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<!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 `FromStr` trait in crate `alloc`."><meta name="keywords" content="rust, rustlang, rust-lang, FromStr"><title>alloc::str::FromStr - 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">&#9776;</div><a href='../../alloc/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 FromStr</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.Err">Err</a></div><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.from_str">from_str</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>alloc</a>::<wbr><a href='index.html'>str</a></p><script>window.sidebarCurrent = {name: 'FromStr', 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'>alloc</a>::<wbr><a href='index.html'>str</a>::<wbr><a class="trait" href=''>FromStr</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'>&#x2212;</span>]</a></span><a class='srclink' href='../../src/core/str/mod.rs.html#76-106' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust trait'>pub trait FromStr {
    type <a href='#associatedtype.Err' class="type">Err</a>;
    fn <a href='#tymethod.from_str' class='fnname'>from_str</a>(s: &amp;str) -&gt; <a class="enum" href="../../core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self, Self::<a class="type" href="../../alloc/str/trait.FromStr.html#associatedtype.Err" title="type alloc::str::FromStr::Err">Err</a>&gt;;
}</pre></div><div class='docblock'><p>A trait to abstract the idea of creating a new instance of a type from a
string.</p>
<p><code>FromStr</code>'s <a href="#tymethod.from_str"><code>from_str</code></a> method is often used implicitly, through
<a href="../../std/primitive.str.html"><code>str</code></a>'s <a href="../../std/primitive.str.html#method.parse"><code>parse</code></a> method. See <a href="../../std/primitive.str.html#method.parse"><code>parse</code></a>'s documentation for examples.</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<p>Basic implementation of <code>FromStr</code> on an example <code>Point</code> type:</p>

<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">str</span>::<span class="ident">FromStr</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">num</span>::<span class="ident">ParseIntError</span>;

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">struct</span> <span class="ident">Point</span> {
    <span class="ident">x</span>: <span class="ident">i32</span>,
    <span class="ident">y</span>: <span class="ident">i32</span>
}

<span class="kw">impl</span> <span class="ident">FromStr</span> <span class="kw">for</span> <span class="ident">Point</span> {
    <span class="kw">type</span> <span class="prelude-val">Err</span> <span class="op">=</span> <span class="ident">ParseIntError</span>;

    <span class="kw">fn</span> <span class="ident">from_str</span>(<span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="self">Self</span>, <span class="self">Self</span>::<span class="prelude-val">Err</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">coords</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">trim_matches</span>(<span class="op">|</span><span class="ident">p</span><span class="op">|</span> <span class="ident">p</span> <span class="op">==</span> <span class="string">&#39;(&#39;</span> <span class="op">||</span> <span class="ident">p</span> <span class="op">==</span> <span class="string">&#39;)&#39;</span> )
                                 .<span class="ident">split</span>(<span class="string">&quot;,&quot;</span>)
                                 .<span class="ident">collect</span>();

        <span class="kw">let</span> <span class="ident">x_fromstr</span> <span class="op">=</span> <span class="ident">coords</span>[<span class="number">0</span>].<span class="ident">parse</span>::<span class="op">&lt;</span><span class="ident">i32</span><span class="op">&gt;</span>()<span class="question-mark">?</span>;
        <span class="kw">let</span> <span class="ident">y_fromstr</span> <span class="op">=</span> <span class="ident">coords</span>[<span class="number">1</span>].<span class="ident">parse</span>::<span class="op">&lt;</span><span class="ident">i32</span><span class="op">&gt;</span>()<span class="question-mark">?</span>;

        <span class="prelude-val">Ok</span>(<span class="ident">Point</span> { <span class="ident">x</span>: <span class="ident">x_fromstr</span>, <span class="ident">y</span>: <span class="ident">y_fromstr</span> })
    }
}

<span class="kw">let</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">Point</span>::<span class="ident">from_str</span>(<span class="string">&quot;(1,2)&quot;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span>.<span class="ident">unwrap</span>(), <span class="ident">Point</span>{ <span class="ident">x</span>: <span class="number">1</span>, <span class="ident">y</span>: <span class="number">2</span>} )</pre>
</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.Err' class='method'><span id='Err.t' class='invisible'><code>type <a href='#associatedtype.Err' class="type">Err</a></code></span></h3><div class='docblock'><p>The associated error which can be returned from parsing.</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.from_str' class='method'><span id='from_str.v' class='invisible'><code>fn <a href='#tymethod.from_str' class='fnname'>from_str</a>(s: &amp;str) -&gt; <a class="enum" href="../../core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self, Self::<a class="type" href="../../alloc/str/trait.FromStr.html#associatedtype.Err" title="type alloc::str::FromStr::Err">Err</a>&gt;</code></span></h3><div class='docblock'><p>Parses a string <code>s</code> to return a value of this type.</p>
<p>If parsing succeeds, return the value inside <a href="../../std/result/enum.Result.html#variant.Ok"><code>Ok</code></a>, otherwise
when the string is ill-formatted return an error specific to the
inside <a href="../../std/result/enum.Result.html#variant.Err"><code>Err</code></a>. The error type is specific to implementation of the trait.</p>
<h1 id="examples-1" class="section-header"><a href="#examples-1">Examples</a></h1>
<p>Basic usage with <a href="../../std/primitive.i32.html"><code>i32</code></a>, a type that implements <code>FromStr</code>:</p>

<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">str</span>::<span class="ident">FromStr</span>;

<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="string">&quot;5&quot;</span>;
<span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> <span class="ident">i32</span>::<span class="ident">from_str</span>(<span class="ident">s</span>).<span class="ident">unwrap</span>();

<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">5</span>, <span class="ident">x</span>);</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><table class='table-display'><tbody><tr><td><code>impl FromStr for char<span class="where fmt-newline">  type <a href='#associatedtype.Err' class="type">Err</a> = <a class="struct" href="../../core/char/convert/struct.ParseCharError.html" title="struct core::char::convert::ParseCharError">ParseCharError</a>;</span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/char/convert.rs.html#188-204' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl FromStr for bool<span class="where fmt-newline">  type <a href='#associatedtype.Err' class="type">Err</a> = <a class="struct" href="../../alloc/str/struct.ParseBoolError.html" title="struct alloc::str::ParseBoolError">ParseBoolError</a>;</span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/str/mod.rs.html#109-142' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl FromStr for i16<span class="where fmt-newline">  type <a href='#associatedtype.Err' class="type">Err</a> = <a class="struct" href="../../core/num/struct.ParseIntError.html" title="struct core::num::ParseIntError">ParseIntError</a>;</span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/num/mod.rs.html#4376-4381' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl FromStr for u128<span class="where fmt-newline">  type <a href='#associatedtype.Err' class="type">Err</a> = <a class="struct" href="../../core/num/struct.ParseIntError.html" title="struct core::num::ParseIntError">ParseIntError</a>;</span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/num/mod.rs.html#4376-4381' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl FromStr for u64<span class="where fmt-newline">  type <a href='#associatedtype.Err' class="type">Err</a> = <a class="struct" href="../../core/num/struct.ParseIntError.html" title="struct core::num::ParseIntError">ParseIntError</a>;</span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/num/mod.rs.html#4376-4381' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl FromStr for u16<span class="where fmt-newline">  type <a href='#associatedtype.Err' class="type">Err</a> = <a class="struct" href="../../core/num/struct.ParseIntError.html" title="struct core::num::ParseIntError">ParseIntError</a>;</span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/num/mod.rs.html#4376-4381' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl FromStr for i64<span class="where fmt-newline">  type <a href='#associatedtype.Err' class="type">Err</a> = <a class="struct" href="../../core/num/struct.ParseIntError.html" title="struct core::num::ParseIntError">ParseIntError</a>;</span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/num/mod.rs.html#4376-4381' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl FromStr for i8<span class="where fmt-newline">  type <a href='#associatedtype.Err' class="type">Err</a> = <a class="struct" href="../../core/num/struct.ParseIntError.html" title="struct core::num::ParseIntError">ParseIntError</a>;</span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/num/mod.rs.html#4376-4381' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl FromStr for u8<span class="where fmt-newline">  type <a href='#associatedtype.Err' class="type">Err</a> = <a class="struct" href="../../core/num/struct.ParseIntError.html" title="struct core::num::ParseIntError">ParseIntError</a>;</span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/num/mod.rs.html#4376-4381' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl FromStr for f32<span class="where fmt-newline">  type <a href='#associatedtype.Err' class="type">Err</a> = <a class="struct" href="../../core/num/dec2flt/struct.ParseFloatError.html" title="struct core::num::dec2flt::ParseFloatError">ParseFloatError</a>;</span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/num/dec2flt/mod.rs.html#112-143' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl FromStr for usize<span class="where fmt-newline">  type <a href='#associatedtype.Err' class="type">Err</a> = <a class="struct" href="../../core/num/struct.ParseIntError.html" title="struct core::num::ParseIntError">ParseIntError</a>;</span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/num/mod.rs.html#4376-4381' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl FromStr for isize<span class="where fmt-newline">  type <a href='#associatedtype.Err' class="type">Err</a> = <a class="struct" href="../../core/num/struct.ParseIntError.html" title="struct core::num::ParseIntError">ParseIntError</a>;</span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/num/mod.rs.html#4376-4381' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl FromStr for i32<span class="where fmt-newline">  type <a href='#associatedtype.Err' class="type">Err</a> = <a class="struct" href="../../core/num/struct.ParseIntError.html" title="struct core::num::ParseIntError">ParseIntError</a>;</span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/num/mod.rs.html#4376-4381' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl FromStr for f64<span class="where fmt-newline">  type <a href='#associatedtype.Err' class="type">Err</a> = <a class="struct" href="../../core/num/dec2flt/struct.ParseFloatError.html" title="struct core::num::dec2flt::ParseFloatError">ParseFloatError</a>;</span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/num/dec2flt/mod.rs.html#112-143' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl FromStr for u32<span class="where fmt-newline">  type <a href='#associatedtype.Err' class="type">Err</a> = <a class="struct" href="../../core/num/struct.ParseIntError.html" title="struct core::num::ParseIntError">ParseIntError</a>;</span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/num/mod.rs.html#4376-4381' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl FromStr for i128<span class="where fmt-newline">  type <a href='#associatedtype.Err' class="type">Err</a> = <a class="struct" href="../../core/num/struct.ParseIntError.html" title="struct core::num::ParseIntError">ParseIntError</a>;</span></code><td><div class='out-of-band'><a class='srclink' href='../../src/core/num/mod.rs.html#4376-4381' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
<li><table class='table-display'><tbody><tr><td><code>impl FromStr for <a class="struct" href="../../alloc/string/struct.String.html" title="struct alloc::string::String">String</a><span class="where fmt-newline">  type <a href='#associatedtype.Err' class="type">Err</a> = <a class="enum" href="../../alloc/string/enum.ParseError.html" title="enum alloc::string::ParseError">ParseError</a>;</span></code><td><div class='out-of-band'><a class='srclink' href='../../src/alloc/string.rs.html#2072-2078' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
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