| <!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="`GroupBy` is the storage for the lazy grouping operation."><meta name="keywords" content="rust, rustlang, rust-lang, GroupBy"><title>GroupBy in itertools::structs - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link 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href="../../itertools/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../itertools/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"><a href="#">GroupBy</a></h2><div class="sidebar-elems"><section><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block"><li><a href="#impl-IntoIterator-for-%26%27a%20GroupBy%3CK%2C%20I%2C%20F%3E">IntoIterator</a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block"><li><a href="#impl-RefUnwindSafe-for-GroupBy%3CK%2C%20I%2C%20F%3E">!RefUnwindSafe</a></li><li><a href="#impl-Send-for-GroupBy%3CK%2C%20I%2C%20F%3E">Send</a></li><li><a href="#impl-Sync-for-GroupBy%3CK%2C%20I%2C%20F%3E">!Sync</a></li><li><a href="#impl-Unpin-for-GroupBy%3CK%2C%20I%2C%20F%3E">Unpin</a></li><li><a href="#impl-UnwindSafe-for-GroupBy%3CK%2C%20I%2C%20F%3E">UnwindSafe</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block"><li><a href="#impl-Any-for-GroupBy%3CK%2C%20I%2C%20F%3E">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-GroupBy%3CK%2C%20I%2C%20F%3E">Borrow<T></a></li><li><a href="#impl-BorrowMut%3CT%3E-for-GroupBy%3CK%2C%20I%2C%20F%3E">BorrowMut<T></a></li><li><a href="#impl-From%3CT%3E-for-GroupBy%3CK%2C%20I%2C%20F%3E">From<T></a></li><li><a href="#impl-Into%3CU%3E-for-GroupBy%3CK%2C%20I%2C%20F%3E">Into<U></a></li><li><a href="#impl-TryFrom%3CU%3E-for-GroupBy%3CK%2C%20I%2C%20F%3E">TryFrom<U></a></li><li><a href="#impl-TryInto%3CU%3E-for-GroupBy%3CK%2C%20I%2C%20F%3E">TryInto<U></a></li></ul></section><h2><a href="index.html">In itertools::structs</a></h2></div></nav><main><div class="width-limiter"><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn">Struct <a href="../index.html">itertools</a>::<wbr><a href="index.html">structs</a>::<wbr><a class="struct" href="#">GroupBy</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="srclink" href="../../src/itertools/groupbylazy.rs.html#289-296">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span></div><div class="item-decl"><pre class="rust struct"><code>pub struct GroupBy<K, I, F><span class="where fmt-newline">where<br> I: Iterator,</span>{ /* private fields */ }</code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p><code>GroupBy</code> is the storage for the lazy grouping operation.</p> |
| <p>If the groups are consumed in their original order, or if each |
| group is dropped without keeping it around, then <code>GroupBy</code> uses |
| no allocations. It needs allocations only if several group iterators |
| are alive at the same time.</p> |
| <p>This type implements [<code>IntoIterator</code>] (it is <strong>not</strong> an iterator |
| itself), because the group iterators need to borrow from this |
| value. It should be stored in a local variable or temporary and |
| iterated.</p> |
| <p>See <a href="../trait.Itertools.html#method.group_by"><code>.group_by()</code></a> for more information.</p> |
| </div></details><h2 id="trait-implementations" class="small-section-header">Trait Implementations<a href="#trait-implementations" class="anchor"></a></h2><div id="trait-implementations-list"><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-IntoIterator-for-%26%27a%20GroupBy%3CK%2C%20I%2C%20F%3E" class="impl has-srclink"><a class="srclink rightside" href="../../src/itertools/groupbylazy.rs.html#337-349">source</a><a href="#impl-IntoIterator-for-%26%27a%20GroupBy%3CK%2C%20I%2C%20F%3E" class="anchor"></a><h3 class="code-header">impl<'a, K, I, F> IntoIterator for &'a <a class="struct" href="struct.GroupBy.html" title="struct itertools::structs::GroupBy">GroupBy</a><K, I, F><span class="where fmt-newline">where<br> I: Iterator,<br> I::Item: 'a,<br> F: FnMut(&I::Item) -> K,<br> K: PartialEq,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><section id="associatedtype.Item" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Item" class="anchor"></a><h4 class="code-header">type <a class="associatedtype">Item</a> = (K, <a class="struct" href="struct.Group.html" title="struct itertools::structs::Group">Group</a><'a, K, I, F>)</h4></section></summary><div class='docblock'>The type of the elements being iterated over.</div></details><details class="rustdoc-toggle" open><summary><section id="associatedtype.IntoIter" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.IntoIter" class="anchor"></a><h4 class="code-header">type <a class="associatedtype">IntoIter</a> = <a class="struct" href="struct.Groups.html" title="struct itertools::structs::Groups">Groups</a><'a, K, I, F></h4></section></summary><div class='docblock'>Which kind of iterator are we turning this into?</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.into_iter" class="method trait-impl has-srclink"><a class="srclink rightside" href="../../src/itertools/groupbylazy.rs.html#346-348">source</a><a href="#method.into_iter" class="anchor"></a><h4 class="code-header">fn <a class="fnname">into_iter</a>(self) -> Self::IntoIter</h4></section></summary><div class='docblock'>Creates an iterator from a value. <a>Read more</a></div></details></div></details></div><h2 id="synthetic-implementations" class="small-section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor"></a></h2><div id="synthetic-implementations-list"><section id="impl-RefUnwindSafe-for-GroupBy%3CK%2C%20I%2C%20F%3E" class="impl has-srclink"><a href="#impl-RefUnwindSafe-for-GroupBy%3CK%2C%20I%2C%20F%3E" class="anchor"></a><h3 class="code-header">impl<K, I, F> !RefUnwindSafe for <a class="struct" href="struct.GroupBy.html" title="struct itertools::structs::GroupBy">GroupBy</a><K, I, F></h3></section><section id="impl-Send-for-GroupBy%3CK%2C%20I%2C%20F%3E" class="impl has-srclink"><a href="#impl-Send-for-GroupBy%3CK%2C%20I%2C%20F%3E" class="anchor"></a><h3 class="code-header">impl<K, I, F> Send for <a class="struct" href="struct.GroupBy.html" title="struct itertools::structs::GroupBy">GroupBy</a><K, I, F><span class="where fmt-newline">where<br> F: Send,<br> I: Send,<br> K: Send,<br> <I as Iterator>::Item: Send,</span></h3></section><section id="impl-Sync-for-GroupBy%3CK%2C%20I%2C%20F%3E" class="impl has-srclink"><a href="#impl-Sync-for-GroupBy%3CK%2C%20I%2C%20F%3E" class="anchor"></a><h3 class="code-header">impl<K, I, F> !Sync for <a class="struct" href="struct.GroupBy.html" title="struct itertools::structs::GroupBy">GroupBy</a><K, I, F></h3></section><section id="impl-Unpin-for-GroupBy%3CK%2C%20I%2C%20F%3E" class="impl has-srclink"><a href="#impl-Unpin-for-GroupBy%3CK%2C%20I%2C%20F%3E" class="anchor"></a><h3 class="code-header">impl<K, I, F> Unpin for <a class="struct" href="struct.GroupBy.html" title="struct itertools::structs::GroupBy">GroupBy</a><K, I, F><span class="where fmt-newline">where<br> F: Unpin,<br> I: Unpin,<br> K: Unpin,<br> <I as Iterator>::Item: Unpin,</span></h3></section><section id="impl-UnwindSafe-for-GroupBy%3CK%2C%20I%2C%20F%3E" class="impl has-srclink"><a href="#impl-UnwindSafe-for-GroupBy%3CK%2C%20I%2C%20F%3E" class="anchor"></a><h3 class="code-header">impl<K, I, F> UnwindSafe for <a class="struct" href="struct.GroupBy.html" title="struct itertools::structs::GroupBy">GroupBy</a><K, I, F><span class="where fmt-newline">where<br> F: UnwindSafe,<br> I: UnwindSafe,<br> K: UnwindSafe,<br> <I as Iterator>::Item: UnwindSafe + RefUnwindSafe,</span></h3></section></div><h2 id="blanket-implementations" class="small-section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor"></a></h2><div id="blanket-implementations-list"><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Any-for-GroupBy%3CK%2C%20I%2C%20F%3E" class="impl has-srclink"><a href="#impl-Any-for-GroupBy%3CK%2C%20I%2C%20F%3E" class="anchor"></a><h3 class="code-header">impl<T> Any for T<span class="where fmt-newline">where<br> T: 'static + ?Sized,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.type_id" class="method trait-impl has-srclink"><a href="#method.type_id" class="anchor"></a><h4 class="code-header">fn <a class="fnname">type_id</a>(&self) -> TypeId</h4></section></summary><div class='docblock'>Gets the <code>TypeId</code> of <code>self</code>. <a>Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E-for-GroupBy%3CK%2C%20I%2C%20F%3E" class="impl has-srclink"><a href="#impl-Borrow%3CT%3E-for-GroupBy%3CK%2C%20I%2C%20F%3E" class="anchor"></a><h3 class="code-header">impl<T> Borrow<T> for T<span class="where fmt-newline">where<br> T: ?Sized,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/91522" title="Tracking issue for const_borrow">unstable</a></span><a href="#method.borrow" class="anchor"></a><h4 class="code-header">fn <a class="fnname">borrow</a>(&self) -> &T</h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a>Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E-for-GroupBy%3CK%2C%20I%2C%20F%3E" class="impl has-srclink"><a href="#impl-BorrowMut%3CT%3E-for-GroupBy%3CK%2C%20I%2C%20F%3E" class="anchor"></a><h3 class="code-header">impl<T> BorrowMut<T> for T<span class="where fmt-newline">where<br> T: ?Sized,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/91522" title="Tracking issue for const_borrow">unstable</a></span><a href="#method.borrow_mut" class="anchor"></a><h4 class="code-header">fn <a class="fnname">borrow_mut</a>(&mut self) -> &mut T</h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a>Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-From%3CT%3E-for-GroupBy%3CK%2C%20I%2C%20F%3E" class="impl has-srclink"><a href="#impl-From%3CT%3E-for-GroupBy%3CK%2C%20I%2C%20F%3E" class="anchor"></a><h3 class="code-header">impl<T> From<T> for T</h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.from" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span><a href="#method.from" class="anchor"></a><h4 class="code-header">fn <a class="fnname">from</a>(t: T) -> T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p> |
| </div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E-for-GroupBy%3CK%2C%20I%2C%20F%3E" class="impl has-srclink"><a href="#impl-Into%3CU%3E-for-GroupBy%3CK%2C%20I%2C%20F%3E" class="anchor"></a><h3 class="code-header">impl<T, U> Into<U> for T<span class="where fmt-newline">where<br> U: From<T>,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.into" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span><a href="#method.into" class="anchor"></a><h4 class="code-header">fn <a class="fnname">into</a>(self) -> U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p> |
| <p>That is, this conversion is whatever the implementation of |
| <code>[From]<T> for U</code> chooses to do.</p> |
| </div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-TryFrom%3CU%3E-for-GroupBy%3CK%2C%20I%2C%20F%3E" class="impl has-srclink"><a href="#impl-TryFrom%3CU%3E-for-GroupBy%3CK%2C%20I%2C%20F%3E" class="anchor"></a><h3 class="code-header">impl<T, U> TryFrom<U> for T<span class="where fmt-newline">where<br> U: Into<T>,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Error-1" class="anchor"></a><h4 class="code-header">type <a class="associatedtype">Error</a> = Infallible</h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span><a href="#method.try_from" class="anchor"></a><h4 class="code-header">fn <a class="fnname">try_from</a>(value: U) -> Result<T, <T as TryFrom<U>>::Error></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-GroupBy%3CK%2C%20I%2C%20F%3E" class="impl has-srclink"><a href="#impl-TryInto%3CU%3E-for-GroupBy%3CK%2C%20I%2C%20F%3E" class="anchor"></a><h3 class="code-header">impl<T, U> TryInto<U> for T<span class="where fmt-newline">where<br> U: TryFrom<T>,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Error" class="anchor"></a><h4 class="code-header">type <a class="associatedtype">Error</a> = <U as TryFrom<T>>::Error</h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span><a href="#method.try_into" class="anchor"></a><h4 class="code-header">fn <a class="fnname">try_into</a>(self) -> Result<U, <U as TryFrom<T>>::Error></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details></div></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="itertools" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
