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2016-05-04 10:41:29 -04:00

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<section id='main' class="content enum">
<h1 class='fqn'><span class='in-band'>Enum <a href='../../index.html'>bitflags</a>::<wbr><a href='../index.html'>__core</a>::<wbr><a href='index.html'>result</a>::<wbr><a class='enum' href=''>Result</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>&#x2212;</span>]
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</span><a id='src-30504' class='srclink' href='https://doc.rust-lang.org/nightly/core/result/enum.Result.html?gotosrc=30504' title='goto source code'>[src]</a></span></h1>
<pre class='rust enum'>#[must_use]
pub enum Result&lt;T, E&gt; {
Ok(T),
Err(E),
}</pre><span class="since">1.0.0</span><div class='docblock'><p><code>Result</code> is a type that represents either success (<code>Ok</code>) or failure (<code>Err</code>).</p>
<p>See the <a href="index.html"><code>std::result</code></a> module documentation for details.</p>
</div><h2 class='variants'>Variants</h2>
<table class='variants_table'><tr><td id='variant.Ok'><code>Ok</code></td><td><div class='docblock'><p>Contains the success value</p>
</div></td><td></td></tr><tr><td id='variant.Err'><code>Err</code></td><td><div class='docblock'><p>Contains the error value</p>
</div></td><td></td></tr></table><h2 id='methods'>Methods</h2><h3 class='impl'><code>impl&lt;T, E&gt; <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, E&gt;</code></h3><div class='impl-items'><h4 id='method.is_ok' class='method'><code>fn <a href='#method.is_ok' class='fnname'>is_ok</a>(&amp;self) -&gt; <a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.bool.html'>bool</a></code></h4>
<div class='docblock'><p>Returns true if the result is <code>Ok</code></p>
<h1 id='examples' class='section-header'><a href='#examples'>Examples</a></h1>
<p>Basic usage:</p>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>i32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>(<span class='op'>-</span><span class='number'>3</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>is_ok</span>(), <span class='boolval'>true</span>);
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>i32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Err</span>(<span class='string'>&quot;Some error message&quot;</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>is_ok</span>(), <span class='boolval'>false</span>);</pre>
</div><h4 id='method.is_err' class='method'><code>fn <a href='#method.is_err' class='fnname'>is_err</a>(&amp;self) -&gt; <a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.bool.html'>bool</a></code></h4>
<div class='docblock'><p>Returns true if the result is <code>Err</code></p>
<h1 id='examples-1' class='section-header'><a href='#examples-1'>Examples</a></h1>
<p>Basic usage:</p>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>i32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>(<span class='op'>-</span><span class='number'>3</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>is_err</span>(), <span class='boolval'>false</span>);
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>i32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Err</span>(<span class='string'>&quot;Some error message&quot;</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>is_err</span>(), <span class='boolval'>true</span>);</pre>
</div><h4 id='method.ok' class='method'><code>fn <a href='#method.ok' class='fnname'>ok</a>(self) -&gt; <a class='enum' href='../../../bitflags/__core/option/enum.Option.html' title='bitflags::__core::option::Option'>Option</a>&lt;T&gt;</code></h4>
<div class='docblock'><p>Converts from <code>Result&lt;T, E&gt;</code> to <code>Option&lt;T&gt;</code></p>
<p>Converts <code>self</code> into an <code>Option&lt;T&gt;</code>, consuming <code>self</code>,
and discarding the error, if any.</p>
<h1 id='examples-2' class='section-header'><a href='#examples-2'>Examples</a></h1>
<p>Basic usage:</p>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>(<span class='number'>2</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>ok</span>(), <span class='prelude-val'>Some</span>(<span class='number'>2</span>));
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Err</span>(<span class='string'>&quot;Nothing here&quot;</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>ok</span>(), <span class='prelude-val'>None</span>);</pre>
</div><h4 id='method.err' class='method'><code>fn <a href='#method.err' class='fnname'>err</a>(self) -&gt; <a class='enum' href='../../../bitflags/__core/option/enum.Option.html' title='bitflags::__core::option::Option'>Option</a>&lt;E&gt;</code></h4>
<div class='docblock'><p>Converts from <code>Result&lt;T, E&gt;</code> to <code>Option&lt;E&gt;</code></p>
<p>Converts <code>self</code> into an <code>Option&lt;E&gt;</code>, consuming <code>self</code>,
and discarding the success value, if any.</p>
<h1 id='examples-3' class='section-header'><a href='#examples-3'>Examples</a></h1>
<p>Basic usage:</p>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>(<span class='number'>2</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>err</span>(), <span class='prelude-val'>None</span>);
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Err</span>(<span class='string'>&quot;Nothing here&quot;</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>err</span>(), <span class='prelude-val'>Some</span>(<span class='string'>&quot;Nothing here&quot;</span>));</pre>
</div><h4 id='method.as_ref' class='method'><code>fn <a href='#method.as_ref' class='fnname'>as_ref</a>(&amp;self) -&gt; <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;&amp;T, &amp;E&gt;</code></h4>
<div class='docblock'><p>Converts from <code>Result&lt;T, E&gt;</code> to <code>Result&lt;&amp;T, &amp;E&gt;</code></p>
<p>Produces a new <code>Result</code>, containing a reference
into the original, leaving the original in place.</p>
<h1 id='examples-4' class='section-header'><a href='#examples-4'>Examples</a></h1>
<p>Basic usage:</p>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>(<span class='number'>2</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>as_ref</span>(), <span class='prelude-val'>Ok</span>(<span class='kw-2'>&amp;</span><span class='number'>2</span>));
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Err</span>(<span class='string'>&quot;Error&quot;</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>as_ref</span>(), <span class='prelude-val'>Err</span>(<span class='kw-2'>&amp;</span><span class='string'>&quot;Error&quot;</span>));</pre>
</div><h4 id='method.as_mut' class='method'><code>fn <a href='#method.as_mut' class='fnname'>as_mut</a>(&amp;mut self) -&gt; <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;&amp;mut T, &amp;mut E&gt;</code></h4>
<div class='docblock'><p>Converts from <code>Result&lt;T, E&gt;</code> to <code>Result&lt;&amp;mut T, &amp;mut E&gt;</code></p>
<h1 id='examples-5' class='section-header'><a href='#examples-5'>Examples</a></h1>
<p>Basic usage:</p>
<pre class='rust rust-example-rendered'>
<span class='kw'>fn</span> <span class='ident'>mutate</span>(<span class='ident'>r</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>i32</span>, <span class='ident'>i32</span><span class='op'>&gt;</span>) {
<span class='kw'>match</span> <span class='ident'>r</span>.<span class='ident'>as_mut</span>() {
<span class='prelude-val'>Ok</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='kw-2'>ref</span> <span class='kw-2'>mut</span> <span class='ident'>v</span>) <span class='op'>=&gt;</span> <span class='op'>*</span><span class='ident'>v</span> <span class='op'>=</span> <span class='number'>42</span>,
<span class='prelude-val'>Err</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='kw-2'>ref</span> <span class='kw-2'>mut</span> <span class='ident'>e</span>) <span class='op'>=&gt;</span> <span class='op'>*</span><span class='ident'>e</span> <span class='op'>=</span> <span class='number'>0</span>,
}
}
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>i32</span>, <span class='ident'>i32</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>(<span class='number'>2</span>);
<span class='ident'>mutate</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>x</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>unwrap</span>(), <span class='number'>42</span>);
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>i32</span>, <span class='ident'>i32</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Err</span>(<span class='number'>13</span>);
<span class='ident'>mutate</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>x</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>unwrap_err</span>(), <span class='number'>0</span>);</pre>
</div><h4 id='method.map' class='method'><code>fn <a href='#method.map' class='fnname'>map</a>&lt;U, F&gt;(self, op: F) -&gt; <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;U, E&gt; <span class='where'>where F: <a class='trait' href='../../../bitflags/__core/ops/trait.FnOnce.html' title='bitflags::__core::ops::FnOnce'>FnOnce</a>(T) -&gt; U</span></code></h4>
<div class='docblock'><p>Maps a <code>Result&lt;T, E&gt;</code> to <code>Result&lt;U, E&gt;</code> by applying a function to a
contained <code>Ok</code> value, leaving an <code>Err</code> value untouched.</p>
<p>This function can be used to compose the results of two functions.</p>
<h1 id='examples-6' class='section-header'><a href='#examples-6'>Examples</a></h1>
<p>Print the numbers on each line of a string multiplied by two.</p>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='ident'>line</span> <span class='op'>=</span> <span class='string'>&quot;1\n2\n3\n4\n&quot;</span>;
<span class='kw'>for</span> <span class='ident'>num</span> <span class='kw'>in</span> <span class='ident'>line</span>.<span class='ident'>lines</span>() {
<span class='kw'>match</span> <span class='ident'>num</span>.<span class='ident'>parse</span>::<span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>i</span><span class='op'>|</span> <span class='ident'>i</span> <span class='op'>*</span> <span class='number'>2</span>) {
<span class='prelude-val'>Ok</span>(<span class='ident'>n</span>) <span class='op'>=&gt;</span> <span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>&quot;{}&quot;</span>, <span class='ident'>n</span>),
<span class='prelude-val'>Err</span>(..) <span class='op'>=&gt;</span> {}
}
}</pre>
</div><h4 id='method.map_err' class='method'><code>fn <a href='#method.map_err' class='fnname'>map_err</a>&lt;F, O&gt;(self, op: O) -&gt; <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, F&gt; <span class='where'>where O: <a class='trait' href='../../../bitflags/__core/ops/trait.FnOnce.html' title='bitflags::__core::ops::FnOnce'>FnOnce</a>(E) -&gt; F</span></code></h4>
<div class='docblock'><p>Maps a <code>Result&lt;T, E&gt;</code> to <code>Result&lt;T, F&gt;</code> by applying a function to a
contained <code>Err</code> value, leaving an <code>Ok</code> value untouched.</p>
<p>This function can be used to pass through a successful result while handling
an error.</p>
<h1 id='examples-7' class='section-header'><a href='#examples-7'>Examples</a></h1>
<p>Basic usage:</p>
<pre class='rust rust-example-rendered'>
<span class='kw'>fn</span> <span class='ident'>stringify</span>(<span class='ident'>x</span>: <span class='ident'>u32</span>) <span class='op'>-&gt;</span> <span class='ident'>String</span> { <span class='macro'>format</span><span class='macro'>!</span>(<span class='string'>&quot;error code: {}&quot;</span>, <span class='ident'>x</span>) }
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='ident'>u32</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>(<span class='number'>2</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>map_err</span>(<span class='ident'>stringify</span>), <span class='prelude-val'>Ok</span>(<span class='number'>2</span>));
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='ident'>u32</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Err</span>(<span class='number'>13</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>map_err</span>(<span class='ident'>stringify</span>), <span class='prelude-val'>Err</span>(<span class='string'>&quot;error code: 13&quot;</span>.<span class='ident'>to_string</span>()));</pre>
</div><h4 id='method.iter' class='method'><code>fn <a href='#method.iter' class='fnname'>iter</a>(&amp;self) -&gt; <a class='struct' href='../../../bitflags/__core/result/struct.Iter.html' title='bitflags::__core::result::Iter'>Iter</a>&lt;T&gt;</code></h4>
<div class='docblock'><p>Returns an iterator over the possibly contained value.</p>
<h1 id='examples-8' class='section-header'><a href='#examples-8'>Examples</a></h1>
<p>Basic usage:</p>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>(<span class='number'>7</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>iter</span>().<span class='ident'>next</span>(), <span class='prelude-val'>Some</span>(<span class='kw-2'>&amp;</span><span class='number'>7</span>));
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Err</span>(<span class='string'>&quot;nothing!&quot;</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>iter</span>().<span class='ident'>next</span>(), <span class='prelude-val'>None</span>);</pre>
</div><h4 id='method.iter_mut' class='method'><code>fn <a href='#method.iter_mut' class='fnname'>iter_mut</a>(&amp;mut self) -&gt; <a class='struct' href='../../../bitflags/__core/result/struct.IterMut.html' title='bitflags::__core::result::IterMut'>IterMut</a>&lt;T&gt;</code></h4>
<div class='docblock'><p>Returns a mutable iterator over the possibly contained value.</p>
<h1 id='examples-9' class='section-header'><a href='#examples-9'>Examples</a></h1>
<p>Basic usage:</p>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>(<span class='number'>7</span>);
<span class='kw'>match</span> <span class='ident'>x</span>.<span class='ident'>iter_mut</span>().<span class='ident'>next</span>() {
<span class='prelude-val'>Some</span>(<span class='ident'>v</span>) <span class='op'>=&gt;</span> <span class='op'>*</span><span class='ident'>v</span> <span class='op'>=</span> <span class='number'>40</span>,
<span class='prelude-val'>None</span> <span class='op'>=&gt;</span> {},
}
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>, <span class='prelude-val'>Ok</span>(<span class='number'>40</span>));
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Err</span>(<span class='string'>&quot;nothing!&quot;</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>iter_mut</span>().<span class='ident'>next</span>(), <span class='prelude-val'>None</span>);</pre>
</div><h4 id='method.and' class='method'><code>fn <a href='#method.and' class='fnname'>and</a>&lt;U&gt;(self, res: <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;U, E&gt;) -&gt; <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;U, E&gt;</code></h4>
<div class='docblock'><p>Returns <code>res</code> if the result is <code>Ok</code>, otherwise returns the <code>Err</code> value of <code>self</code>.</p>
<h1 id='examples-10' class='section-header'><a href='#examples-10'>Examples</a></h1>
<p>Basic usage:</p>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>(<span class='number'>2</span>);
<span class='kw'>let</span> <span class='ident'>y</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='kw-2'>&amp;</span><span class='ident'>str</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Err</span>(<span class='string'>&quot;late error&quot;</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>and</span>(<span class='ident'>y</span>), <span class='prelude-val'>Err</span>(<span class='string'>&quot;late error&quot;</span>));
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Err</span>(<span class='string'>&quot;early error&quot;</span>);
<span class='kw'>let</span> <span class='ident'>y</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='kw-2'>&amp;</span><span class='ident'>str</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>(<span class='string'>&quot;foo&quot;</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>and</span>(<span class='ident'>y</span>), <span class='prelude-val'>Err</span>(<span class='string'>&quot;early error&quot;</span>));
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Err</span>(<span class='string'>&quot;not a 2&quot;</span>);
<span class='kw'>let</span> <span class='ident'>y</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='kw-2'>&amp;</span><span class='ident'>str</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Err</span>(<span class='string'>&quot;late error&quot;</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>and</span>(<span class='ident'>y</span>), <span class='prelude-val'>Err</span>(<span class='string'>&quot;not a 2&quot;</span>));
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>(<span class='number'>2</span>);
<span class='kw'>let</span> <span class='ident'>y</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='kw-2'>&amp;</span><span class='ident'>str</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>(<span class='string'>&quot;different result type&quot;</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>and</span>(<span class='ident'>y</span>), <span class='prelude-val'>Ok</span>(<span class='string'>&quot;different result type&quot;</span>));</pre>
</div><h4 id='method.and_then' class='method'><code>fn <a href='#method.and_then' class='fnname'>and_then</a>&lt;U, F&gt;(self, op: F) -&gt; <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;U, E&gt; <span class='where'>where F: <a class='trait' href='../../../bitflags/__core/ops/trait.FnOnce.html' title='bitflags::__core::ops::FnOnce'>FnOnce</a>(T) -&gt; <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;U, E&gt;</span></code></h4>
<div class='docblock'><p>Calls <code>op</code> if the result is <code>Ok</code>, otherwise returns the <code>Err</code> value of <code>self</code>.</p>
<p>This function can be used for control flow based on result values.</p>
<h1 id='examples-11' class='section-header'><a href='#examples-11'>Examples</a></h1>
<p>Basic usage:</p>
<pre class='rust rust-example-rendered'>
<span class='kw'>fn</span> <span class='ident'>sq</span>(<span class='ident'>x</span>: <span class='ident'>u32</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='ident'>u32</span><span class='op'>&gt;</span> { <span class='prelude-val'>Ok</span>(<span class='ident'>x</span> <span class='op'>*</span> <span class='ident'>x</span>) }
<span class='kw'>fn</span> <span class='ident'>err</span>(<span class='ident'>x</span>: <span class='ident'>u32</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='ident'>u32</span><span class='op'>&gt;</span> { <span class='prelude-val'>Err</span>(<span class='ident'>x</span>) }
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Ok</span>(<span class='number'>2</span>).<span class='ident'>and_then</span>(<span class='ident'>sq</span>).<span class='ident'>and_then</span>(<span class='ident'>sq</span>), <span class='prelude-val'>Ok</span>(<span class='number'>16</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Ok</span>(<span class='number'>2</span>).<span class='ident'>and_then</span>(<span class='ident'>sq</span>).<span class='ident'>and_then</span>(<span class='ident'>err</span>), <span class='prelude-val'>Err</span>(<span class='number'>4</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Ok</span>(<span class='number'>2</span>).<span class='ident'>and_then</span>(<span class='ident'>err</span>).<span class='ident'>and_then</span>(<span class='ident'>sq</span>), <span class='prelude-val'>Err</span>(<span class='number'>2</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Err</span>(<span class='number'>3</span>).<span class='ident'>and_then</span>(<span class='ident'>sq</span>).<span class='ident'>and_then</span>(<span class='ident'>sq</span>), <span class='prelude-val'>Err</span>(<span class='number'>3</span>));</pre>
</div><h4 id='method.or' class='method'><code>fn <a href='#method.or' class='fnname'>or</a>&lt;F&gt;(self, res: <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, F&gt;) -&gt; <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, F&gt;</code></h4>
<div class='docblock'><p>Returns <code>res</code> if the result is <code>Err</code>, otherwise returns the <code>Ok</code> value of <code>self</code>.</p>
<h1 id='examples-12' class='section-header'><a href='#examples-12'>Examples</a></h1>
<p>Basic usage:</p>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>(<span class='number'>2</span>);
<span class='kw'>let</span> <span class='ident'>y</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Err</span>(<span class='string'>&quot;late error&quot;</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>or</span>(<span class='ident'>y</span>), <span class='prelude-val'>Ok</span>(<span class='number'>2</span>));
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Err</span>(<span class='string'>&quot;early error&quot;</span>);
<span class='kw'>let</span> <span class='ident'>y</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>(<span class='number'>2</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>or</span>(<span class='ident'>y</span>), <span class='prelude-val'>Ok</span>(<span class='number'>2</span>));
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Err</span>(<span class='string'>&quot;not a 2&quot;</span>);
<span class='kw'>let</span> <span class='ident'>y</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Err</span>(<span class='string'>&quot;late error&quot;</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>or</span>(<span class='ident'>y</span>), <span class='prelude-val'>Err</span>(<span class='string'>&quot;late error&quot;</span>));
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>(<span class='number'>2</span>);
<span class='kw'>let</span> <span class='ident'>y</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>(<span class='number'>100</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>or</span>(<span class='ident'>y</span>), <span class='prelude-val'>Ok</span>(<span class='number'>2</span>));</pre>
</div><h4 id='method.or_else' class='method'><code>fn <a href='#method.or_else' class='fnname'>or_else</a>&lt;F, O&gt;(self, op: O) -&gt; <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, F&gt; <span class='where'>where O: <a class='trait' href='../../../bitflags/__core/ops/trait.FnOnce.html' title='bitflags::__core::ops::FnOnce'>FnOnce</a>(E) -&gt; <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, F&gt;</span></code></h4>
<div class='docblock'><p>Calls <code>op</code> if the result is <code>Err</code>, otherwise returns the <code>Ok</code> value of <code>self</code>.</p>
<p>This function can be used for control flow based on result values.</p>
<h1 id='examples-13' class='section-header'><a href='#examples-13'>Examples</a></h1>
<p>Basic usage:</p>
<pre class='rust rust-example-rendered'>
<span class='kw'>fn</span> <span class='ident'>sq</span>(<span class='ident'>x</span>: <span class='ident'>u32</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='ident'>u32</span><span class='op'>&gt;</span> { <span class='prelude-val'>Ok</span>(<span class='ident'>x</span> <span class='op'>*</span> <span class='ident'>x</span>) }
<span class='kw'>fn</span> <span class='ident'>err</span>(<span class='ident'>x</span>: <span class='ident'>u32</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='ident'>u32</span><span class='op'>&gt;</span> { <span class='prelude-val'>Err</span>(<span class='ident'>x</span>) }
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Ok</span>(<span class='number'>2</span>).<span class='ident'>or_else</span>(<span class='ident'>sq</span>).<span class='ident'>or_else</span>(<span class='ident'>sq</span>), <span class='prelude-val'>Ok</span>(<span class='number'>2</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Ok</span>(<span class='number'>2</span>).<span class='ident'>or_else</span>(<span class='ident'>err</span>).<span class='ident'>or_else</span>(<span class='ident'>sq</span>), <span class='prelude-val'>Ok</span>(<span class='number'>2</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Err</span>(<span class='number'>3</span>).<span class='ident'>or_else</span>(<span class='ident'>sq</span>).<span class='ident'>or_else</span>(<span class='ident'>err</span>), <span class='prelude-val'>Ok</span>(<span class='number'>9</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Err</span>(<span class='number'>3</span>).<span class='ident'>or_else</span>(<span class='ident'>err</span>).<span class='ident'>or_else</span>(<span class='ident'>err</span>), <span class='prelude-val'>Err</span>(<span class='number'>3</span>));</pre>
</div><h4 id='method.unwrap_or' class='method'><code>fn <a href='#method.unwrap_or' class='fnname'>unwrap_or</a>(self, optb: T) -&gt; T</code></h4>
<div class='docblock'><p>Unwraps a result, yielding the content of an <code>Ok</code>.
Else it returns <code>optb</code>.</p>
<h1 id='examples-14' class='section-header'><a href='#examples-14'>Examples</a></h1>
<p>Basic usage:</p>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='ident'>optb</span> <span class='op'>=</span> <span class='number'>2</span>;
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>(<span class='number'>9</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>unwrap_or</span>(<span class='ident'>optb</span>), <span class='number'>9</span>);
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Err</span>(<span class='string'>&quot;error&quot;</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>unwrap_or</span>(<span class='ident'>optb</span>), <span class='ident'>optb</span>);</pre>
</div><h4 id='method.unwrap_or_else' class='method'><code>fn <a href='#method.unwrap_or_else' class='fnname'>unwrap_or_else</a>&lt;F&gt;(self, op: F) -&gt; T <span class='where'>where F: <a class='trait' href='../../../bitflags/__core/ops/trait.FnOnce.html' title='bitflags::__core::ops::FnOnce'>FnOnce</a>(E) -&gt; T</span></code></h4>
<div class='docblock'><p>Unwraps a result, yielding the content of an <code>Ok</code>.
If the value is an <code>Err</code> then it calls <code>op</code> with its value.</p>
<h1 id='examples-15' class='section-header'><a href='#examples-15'>Examples</a></h1>
<p>Basic usage:</p>
<pre class='rust rust-example-rendered'>
<span class='kw'>fn</span> <span class='ident'>count</span>(<span class='ident'>x</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='ident'>usize</span> { <span class='ident'>x</span>.<span class='ident'>len</span>() }
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Ok</span>(<span class='number'>2</span>).<span class='ident'>unwrap_or_else</span>(<span class='ident'>count</span>), <span class='number'>2</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Err</span>(<span class='string'>&quot;foo&quot;</span>).<span class='ident'>unwrap_or_else</span>(<span class='ident'>count</span>), <span class='number'>3</span>);</pre>
</div></div><h3 class='impl'><code>impl&lt;T, E&gt; <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, E&gt; <span class='where'>where E: <a class='trait' href='../../../bitflags/__core/fmt/trait.Debug.html' title='bitflags::__core::fmt::Debug'>Debug</a></span></code></h3><div class='impl-items'><h4 id='method.unwrap' class='method'><code>fn <a href='#method.unwrap' class='fnname'>unwrap</a>(self) -&gt; T</code></h4>
<div class='docblock'><p>Unwraps a result, yielding the content of an <code>Ok</code>.</p>
<h1 id='panics' class='section-header'><a href='#panics'>Panics</a></h1>
<p>Panics if the value is an <code>Err</code>, with a panic message provided by the
<code>Err</code>&#39;s value.</p>
<h1 id='examples-16' class='section-header'><a href='#examples-16'>Examples</a></h1>
<p>Basic usage:</p>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>(<span class='number'>2</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>unwrap</span>(), <span class='number'>2</span>);</pre>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Err</span>(<span class='string'>&quot;emergency failure&quot;</span>);
<span class='ident'>x</span>.<span class='ident'>unwrap</span>(); <span class='comment'>// panics with `emergency failure`</span></pre>
</div><h4 id='method.expect' class='method'><code>fn <a href='#method.expect' class='fnname'>expect</a>(self, msg: &amp;<a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.str.html'>str</a>) -&gt; T</code><span class="since">1.4.0</span></h4>
<div class='docblock'><p>Unwraps a result, yielding the content of an <code>Ok</code>.</p>
<h1 id='panics-1' class='section-header'><a href='#panics-1'>Panics</a></h1>
<p>Panics if the value is an <code>Err</code>, with a panic message including the
passed message, and the content of the <code>Err</code>.</p>
<h1 id='examples-17' class='section-header'><a href='#examples-17'>Examples</a></h1>
<p>Basic usage:</p>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Err</span>(<span class='string'>&quot;emergency failure&quot;</span>);
<span class='ident'>x</span>.<span class='ident'>expect</span>(<span class='string'>&quot;Testing expect&quot;</span>); <span class='comment'>// panics with `Testing expect: emergency failure`</span></pre>
</div></div><h3 class='impl'><code>impl&lt;T, E&gt; <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, E&gt; <span class='where'>where T: <a class='trait' href='../../../bitflags/__core/fmt/trait.Debug.html' title='bitflags::__core::fmt::Debug'>Debug</a></span></code></h3><div class='impl-items'><h4 id='method.unwrap_err' class='method'><code>fn <a href='#method.unwrap_err' class='fnname'>unwrap_err</a>(self) -&gt; E</code></h4>
<div class='docblock'><p>Unwraps a result, yielding the content of an <code>Err</code>.</p>
<h1 id='panics-2' class='section-header'><a href='#panics-2'>Panics</a></h1>
<p>Panics if the value is an <code>Ok</code>, with a custom panic message provided
by the <code>Ok</code>&#39;s value.</p>
<h1 id='examples-18' class='section-header'><a href='#examples-18'>Examples</a></h1>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>(<span class='number'>2</span>);
<span class='ident'>x</span>.<span class='ident'>unwrap_err</span>(); <span class='comment'>// panics with `2`</span></pre>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Err</span>(<span class='string'>&quot;emergency failure&quot;</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>x</span>.<span class='ident'>unwrap_err</span>(), <span class='string'>&quot;emergency failure&quot;</span>);</pre>
</div></div><h2 id='implementations'>Trait Implementations</h2><h3 class='impl'><code>impl&lt;T, E&gt; <a class='trait' href='../../../bitflags/__core/iter/trait.IntoIterator.html' title='bitflags::__core::iter::IntoIterator'>IntoIterator</a> for <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, E&gt;</code></h3><div class='impl-items'><h4 id='associatedtype.Item' class='type'><code>type <a href='../../../bitflags/__core/iter/trait.IntoIterator.html#associatedtype.Item' class='type'>Item</a> = T</code></h4>
<h4 id='associatedtype.IntoIter' class='type'><code>type <a href='../../../bitflags/__core/iter/trait.IntoIterator.html#associatedtype.IntoIter' class='type'>IntoIter</a> = <a class='struct' href='../../../bitflags/__core/result/struct.IntoIter.html' title='bitflags::__core::result::IntoIter'>IntoIter</a>&lt;T&gt;</code></h4>
<h4 id='method.into_iter' class='method'><code>fn <a href='../../../bitflags/__core/iter/trait.IntoIterator.html#tymethod.into_iter' class='fnname'>into_iter</a>(self) -&gt; <a class='struct' href='../../../bitflags/__core/result/struct.IntoIter.html' title='bitflags::__core::result::IntoIter'>IntoIter</a>&lt;T&gt;</code></h4>
<div class='docblock'><p>Returns a consuming iterator over the possibly contained value.</p>
<h1 id='examples-19' class='section-header'><a href='#examples-19'>Examples</a></h1>
<p>Basic usage:</p>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Ok</span>(<span class='number'>5</span>);
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u32</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>x</span>.<span class='ident'>into_iter</span>().<span class='ident'>collect</span>();
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='number'>5</span>]);
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>u32</span>, <span class='kw-2'>&amp;</span><span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='prelude-val'>Err</span>(<span class='string'>&quot;nothing!&quot;</span>);
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u32</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>x</span>.<span class='ident'>into_iter</span>().<span class='ident'>collect</span>();
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, []);</pre>
</div></div><h3 class='impl'><code>impl&lt;'a, T, E&gt; <a class='trait' href='../../../bitflags/__core/iter/trait.IntoIterator.html' title='bitflags::__core::iter::IntoIterator'>IntoIterator</a> for &amp;'a <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, E&gt;</code><span class="since">1.4.0</span></h3><div class='impl-items'><h4 id='associatedtype.Item-1' class='type'><code>type <a href='../../../bitflags/__core/iter/trait.IntoIterator.html#associatedtype.Item' class='type'>Item</a> = &amp;'a T</code></h4>
<h4 id='associatedtype.IntoIter-1' class='type'><code>type <a href='../../../bitflags/__core/iter/trait.IntoIterator.html#associatedtype.IntoIter' class='type'>IntoIter</a> = <a class='struct' href='../../../bitflags/__core/result/struct.Iter.html' title='bitflags::__core::result::Iter'>Iter</a>&lt;'a, T&gt;</code></h4>
<h4 id='method.into_iter-1' class='method'><code>fn <a href='../../../bitflags/__core/iter/trait.IntoIterator.html#tymethod.into_iter' class='fnname'>into_iter</a>(self) -&gt; <a class='struct' href='../../../bitflags/__core/result/struct.Iter.html' title='bitflags::__core::result::Iter'>Iter</a>&lt;'a, T&gt;</code></h4>
</div><h3 class='impl'><code>impl&lt;'a, T, E&gt; <a class='trait' href='../../../bitflags/__core/iter/trait.IntoIterator.html' title='bitflags::__core::iter::IntoIterator'>IntoIterator</a> for &amp;'a mut <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, E&gt;</code><span class="since">1.4.0</span></h3><div class='impl-items'><h4 id='associatedtype.Item-2' class='type'><code>type <a href='../../../bitflags/__core/iter/trait.IntoIterator.html#associatedtype.Item' class='type'>Item</a> = &amp;'a mut T</code></h4>
<h4 id='associatedtype.IntoIter-2' class='type'><code>type <a href='../../../bitflags/__core/iter/trait.IntoIterator.html#associatedtype.IntoIter' class='type'>IntoIter</a> = <a class='struct' href='../../../bitflags/__core/result/struct.IterMut.html' title='bitflags::__core::result::IterMut'>IterMut</a>&lt;'a, T&gt;</code></h4>
<h4 id='method.into_iter-2' class='method'><code>fn <a href='../../../bitflags/__core/iter/trait.IntoIterator.html#tymethod.into_iter' class='fnname'>into_iter</a>(self) -&gt; <a class='struct' href='../../../bitflags/__core/result/struct.IterMut.html' title='bitflags::__core::result::IterMut'>IterMut</a>&lt;'a, T&gt;</code></h4>
</div><h3 class='impl'><code>impl&lt;A, E, V&gt; <a class='trait' href='../../../bitflags/__core/iter/trait.FromIterator.html' title='bitflags::__core::iter::FromIterator'>FromIterator</a>&lt;<a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;A, E&gt;&gt; for <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;V, E&gt; <span class='where'>where V: <a class='trait' href='../../../bitflags/__core/iter/trait.FromIterator.html' title='bitflags::__core::iter::FromIterator'>FromIterator</a>&lt;A&gt;</span></code></h3><div class='impl-items'><h4 id='method.from_iter' class='method'><code>fn <a href='../../../bitflags/__core/iter/trait.FromIterator.html#tymethod.from_iter' class='fnname'>from_iter</a>&lt;I&gt;(iter: I) -&gt; <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;V, E&gt; <span class='where'>where I: <a class='trait' href='../../../bitflags/__core/iter/trait.IntoIterator.html' title='bitflags::__core::iter::IntoIterator'>IntoIterator</a>&lt;Item=<a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;A, E&gt;&gt;</span></code></h4>
<div class='docblock'><p>Takes each element in the <code>Iterator</code>: if it is an <code>Err</code>, no further
elements are taken, and the <code>Err</code> is returned. Should no <code>Err</code> occur, a
container with the values of each <code>Result</code> is returned.</p>
<p>Here is an example which increments every integer in a vector,
checking for overflow:</p>
<pre class='rust rust-example-rendered'>
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>u32</span>;
<span class='kw'>let</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>(<span class='number'>1</span>, <span class='number'>2</span>);
<span class='kw'>let</span> <span class='ident'>res</span>: <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u32</span><span class='op'>&gt;</span>, <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;static</span> <span class='ident'>str</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>v</span>.<span class='ident'>iter</span>().<span class='ident'>map</span>(<span class='op'>|</span><span class='kw-2'>&amp;</span><span class='ident'>x</span>: <span class='kw-2'>&amp;</span><span class='ident'>u32</span><span class='op'>|</span>
<span class='kw'>if</span> <span class='ident'>x</span> <span class='op'>==</span> <span class='ident'>u32</span>::<span class='ident'>MAX</span> { <span class='prelude-val'>Err</span>(<span class='string'>&quot;Overflow!&quot;</span>) }
<span class='kw'>else</span> { <span class='prelude-val'>Ok</span>(<span class='ident'>x</span> <span class='op'>+</span> <span class='number'>1</span>) }
).<span class='ident'>collect</span>();
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>res</span> <span class='op'>==</span> <span class='prelude-val'>Ok</span>(<span class='macro'>vec</span><span class='macro'>!</span>(<span class='number'>2</span>, <span class='number'>3</span>)));</pre>
</div></div><h3 id='derived_implementations'>Derived Implementations </h3><h3 class='impl'><code>impl&lt;T, E&gt; <a class='trait' href='../../../bitflags/__core/hash/trait.Hash.html' title='bitflags::__core::hash::Hash'>Hash</a> for <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, E&gt; <span class='where'>where T: <a class='trait' href='../../../bitflags/__core/hash/trait.Hash.html' title='bitflags::__core::hash::Hash'>Hash</a>, E: <a class='trait' href='../../../bitflags/__core/hash/trait.Hash.html' title='bitflags::__core::hash::Hash'>Hash</a></span></code></h3><div class='impl-items'><h4 id='method.hash' class='method'><code>fn <a href='../../../bitflags/__core/hash/trait.Hash.html#tymethod.hash' class='fnname'>hash</a>&lt;__HTE&gt;(&amp;self, __arg_0: &amp;mut __HTE) <span class='where'>where __HTE: <a class='trait' href='../../../bitflags/__core/hash/trait.Hasher.html' title='bitflags::__core::hash::Hasher'>Hasher</a></span></code></h4>
<h4 id='method.hash_slice' class='method'><code>fn <a href='../../../bitflags/__core/hash/trait.Hash.html#method.hash_slice' class='fnname'>hash_slice</a>&lt;H&gt;(data: <a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.slice.html'>&amp;[Self]</a>, state: &amp;mut H) <span class='where'>where H: <a class='trait' href='../../../bitflags/__core/hash/trait.Hasher.html' title='bitflags::__core::hash::Hasher'>Hasher</a></span></code><span class="since">1.3.0</span></h4>
</div><h3 class='impl'><code>impl&lt;T, E&gt; <a class='trait' href='../../../bitflags/__core/fmt/trait.Debug.html' title='bitflags::__core::fmt::Debug'>Debug</a> for <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, E&gt; <span class='where'>where T: <a class='trait' href='../../../bitflags/__core/fmt/trait.Debug.html' title='bitflags::__core::fmt::Debug'>Debug</a>, E: <a class='trait' href='../../../bitflags/__core/fmt/trait.Debug.html' title='bitflags::__core::fmt::Debug'>Debug</a></span></code></h3><div class='impl-items'><h4 id='method.fmt' class='method'><code>fn <a href='../../../bitflags/__core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&amp;self, __arg_0: &amp;mut <a class='struct' href='../../../bitflags/__core/fmt/struct.Formatter.html' title='bitflags::__core::fmt::Formatter'>Formatter</a>) -&gt; <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;<a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.tuple.html'>()</a>, <a class='struct' href='../../../bitflags/__core/fmt/struct.Error.html' title='bitflags::__core::fmt::Error'>Error</a>&gt;</code></h4>
</div><h3 class='impl'><code>impl&lt;T, E&gt; <a class='trait' href='../../../bitflags/__core/cmp/trait.Ord.html' title='bitflags::__core::cmp::Ord'>Ord</a> for <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, E&gt; <span class='where'>where T: <a class='trait' href='../../../bitflags/__core/cmp/trait.Ord.html' title='bitflags::__core::cmp::Ord'>Ord</a>, E: <a class='trait' href='../../../bitflags/__core/cmp/trait.Ord.html' title='bitflags::__core::cmp::Ord'>Ord</a></span></code></h3><div class='impl-items'><h4 id='method.cmp' class='method'><code>fn <a href='../../../bitflags/__core/cmp/trait.Ord.html#tymethod.cmp' class='fnname'>cmp</a>(&amp;self, __arg_0: &amp;<a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, E&gt;) -&gt; <a class='enum' href='../../../bitflags/__core/cmp/enum.Ordering.html' title='bitflags::__core::cmp::Ordering'>Ordering</a></code></h4>
</div><h3 class='impl'><code>impl&lt;T, E&gt; <a class='trait' href='../../../bitflags/__core/cmp/trait.Eq.html' title='bitflags::__core::cmp::Eq'>Eq</a> for <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, E&gt; <span class='where'>where E: <a class='trait' href='../../../bitflags/__core/cmp/trait.Eq.html' title='bitflags::__core::cmp::Eq'>Eq</a>, T: <a class='trait' href='../../../bitflags/__core/cmp/trait.Eq.html' title='bitflags::__core::cmp::Eq'>Eq</a></span></code></h3><div class='impl-items'></div><h3 class='impl'><code>impl&lt;T, E&gt; <a class='trait' href='../../../bitflags/__core/cmp/trait.PartialOrd.html' title='bitflags::__core::cmp::PartialOrd'>PartialOrd</a>&lt;<a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, E&gt;&gt; for <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, E&gt; <span class='where'>where E: <a class='trait' href='../../../bitflags/__core/cmp/trait.PartialOrd.html' title='bitflags::__core::cmp::PartialOrd'>PartialOrd</a>&lt;E&gt;, T: <a class='trait' href='../../../bitflags/__core/cmp/trait.PartialOrd.html' title='bitflags::__core::cmp::PartialOrd'>PartialOrd</a>&lt;T&gt;</span></code></h3><div class='impl-items'><h4 id='method.partial_cmp' class='method'><code>fn <a href='../../../bitflags/__core/cmp/trait.PartialOrd.html#tymethod.partial_cmp' class='fnname'>partial_cmp</a>(&amp;self, __arg_0: &amp;<a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, E&gt;) -&gt; <a class='enum' href='../../../bitflags/__core/option/enum.Option.html' title='bitflags::__core::option::Option'>Option</a>&lt;<a class='enum' href='../../../bitflags/__core/cmp/enum.Ordering.html' title='bitflags::__core::cmp::Ordering'>Ordering</a>&gt;</code></h4>
<h4 id='method.lt' class='method'><code>fn <a href='../../../bitflags/__core/cmp/trait.PartialOrd.html#method.lt' class='fnname'>lt</a>(&amp;self, __arg_0: &amp;<a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, E&gt;) -&gt; <a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.bool.html'>bool</a></code></h4>
<h4 id='method.le' class='method'><code>fn <a href='../../../bitflags/__core/cmp/trait.PartialOrd.html#method.le' class='fnname'>le</a>(&amp;self, __arg_0: &amp;<a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, E&gt;) -&gt; <a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.bool.html'>bool</a></code></h4>
<h4 id='method.gt' class='method'><code>fn <a href='../../../bitflags/__core/cmp/trait.PartialOrd.html#method.gt' class='fnname'>gt</a>(&amp;self, __arg_0: &amp;<a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, E&gt;) -&gt; <a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.bool.html'>bool</a></code></h4>
<h4 id='method.ge' class='method'><code>fn <a href='../../../bitflags/__core/cmp/trait.PartialOrd.html#method.ge' class='fnname'>ge</a>(&amp;self, __arg_0: &amp;<a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, E&gt;) -&gt; <a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.bool.html'>bool</a></code></h4>
</div><h3 class='impl'><code>impl&lt;T, E&gt; <a class='trait' href='../../../bitflags/__core/cmp/trait.PartialEq.html' title='bitflags::__core::cmp::PartialEq'>PartialEq</a>&lt;<a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, E&gt;&gt; for <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, E&gt; <span class='where'>where E: <a class='trait' href='../../../bitflags/__core/cmp/trait.PartialEq.html' title='bitflags::__core::cmp::PartialEq'>PartialEq</a>&lt;E&gt;, T: <a class='trait' href='../../../bitflags/__core/cmp/trait.PartialEq.html' title='bitflags::__core::cmp::PartialEq'>PartialEq</a>&lt;T&gt;</span></code></h3><div class='impl-items'><h4 id='method.eq' class='method'><code>fn <a href='../../../bitflags/__core/cmp/trait.PartialEq.html#tymethod.eq' class='fnname'>eq</a>(&amp;self, __arg_0: &amp;<a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, E&gt;) -&gt; <a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.bool.html'>bool</a></code></h4>
<h4 id='method.ne' class='method'><code>fn <a href='../../../bitflags/__core/cmp/trait.PartialEq.html#method.ne' class='fnname'>ne</a>(&amp;self, __arg_0: &amp;<a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, E&gt;) -&gt; <a class='primitive' href='https://doc.rust-lang.org/nightly/bitflags/primitive.bool.html'>bool</a></code></h4>
</div><h3 class='impl'><code>impl&lt;T, E&gt; <a class='trait' href='../../../bitflags/__core/marker/trait.Copy.html' title='bitflags::__core::marker::Copy'>Copy</a> for <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, E&gt; <span class='where'>where T: <a class='trait' href='../../../bitflags/__core/marker/trait.Copy.html' title='bitflags::__core::marker::Copy'>Copy</a>, E: <a class='trait' href='../../../bitflags/__core/marker/trait.Copy.html' title='bitflags::__core::marker::Copy'>Copy</a></span></code></h3><div class='impl-items'></div><h3 class='impl'><code>impl&lt;T, E&gt; <a class='trait' href='../../../bitflags/__core/clone/trait.Clone.html' title='bitflags::__core::clone::Clone'>Clone</a> for <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, E&gt; <span class='where'>where E: <a class='trait' href='../../../bitflags/__core/clone/trait.Clone.html' title='bitflags::__core::clone::Clone'>Clone</a>, T: <a class='trait' href='../../../bitflags/__core/clone/trait.Clone.html' title='bitflags::__core::clone::Clone'>Clone</a></span></code></h3><div class='impl-items'><h4 id='method.clone' class='method'><code>fn <a href='../../../bitflags/__core/clone/trait.Clone.html#tymethod.clone' class='fnname'>clone</a>(&amp;self) -&gt; <a class='enum' href='../../../bitflags/__core/result/enum.Result.html' title='bitflags::__core::result::Result'>Result</a>&lt;T, E&gt;</code></h4>
<h4 id='method.clone_from' class='method'><code>fn <a href='../../../bitflags/__core/clone/trait.Clone.html#method.clone_from' class='fnname'>clone_from</a>(&amp;mut self, source: &amp;Self)</code></h4>
</div></section>
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