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<p class='location'>Struct OpBuilder</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.new">new</a><a href="#method.add">add</a><a href="#method.push">push</a><a href="#method.union">union</a><a href="#method.intersection">intersection</a><a href="#method.difference">difference</a><a href="#method.symmetric_difference">symmetric_difference</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Extend%3CI%3E">Extend<I></a><a href="#impl-FromIterator%3CI%3E">FromIterator<I></a></div><a class="sidebar-title" href="#synthetic-implementations">Auto Trait Implementations</a><div class="sidebar-links"><a href="#impl-Send">!Send</a><a href="#impl-Sync">!Sync</a></div></div><p class='location'><a href='../index.html'>fst</a>::<wbr><a href='index.html'>set</a></p><script>window.sidebarCurrent = {name: 'OpBuilder', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<section id='main' class="content"><h1 class='fqn'><span class='in-band'>Struct <a href='../index.html'>fst</a>::<wbr><a href='index.html'>set</a>::<wbr><a class="struct" href=''>OpBuilder</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</span><a class='srclink' href='../../src/fst/set.rs.html#612' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust struct'>pub struct OpBuilder<'s>(_);</pre></div><div class='docblock'><p>A builder for collecting set streams on which to perform set operations.</p>
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<p>Set operations include intersection, union, difference and symmetric
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difference. The result of each set operation is itself a stream that emits
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keys in lexicographic order.</p>
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<p>All set operations work efficiently on an arbitrary number of
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streams with memory proportional to the number of streams.</p>
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<p>The algorithmic complexity of all set operations is <code>O(n1 + n2 + n3 + ...)</code>
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where <code>n1, n2, n3, ...</code> correspond to the number of elements in each
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stream.</p>
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<p>The <code>'s</code> lifetime parameter refers to the lifetime of the underlying set.</p>
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</div>
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<h2 id='methods' class='small-section-header'>
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Methods<a href='#methods' class='anchor'></a>
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</h2>
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<h3 id='impl' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<'s> <a class="struct" href="../../fst/set/struct.OpBuilder.html" title="struct fst::set::OpBuilder">OpBuilder</a><'s></code><a href='#impl' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/fst/set.rs.html#614-740' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.new' class="method"><span id='new.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.new' class='fnname'>new</a>() -> Self</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/fst/set.rs.html#616-618' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Create a new set operation builder.</p>
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</div><h4 id='method.add' class="method"><span id='add.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.add' class='fnname'>add</a><I, S>(self, streamable: I) -> Self <span class="where fmt-newline">where<br> I: for<'a> <a class="trait" href="../../fst/trait.IntoStreamer.html" title="trait fst::IntoStreamer">IntoStreamer</a><'a, Into = S, Item = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&'a [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>>,<br> S: 's + for<'a> <a class="trait" href="../../fst/trait.Streamer.html" title="trait fst::Streamer">Streamer</a><'a, Item = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&'a [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>>, </span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/fst/set.rs.html#627-632' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Add a stream to this set operation.</p>
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<p>This is useful for a chaining style pattern, e.g.,
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<code>builder.add(stream1).add(stream2).union()</code>.</p>
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<p>The stream must emit a lexicographically ordered sequence of byte
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strings.</p>
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</div><h4 id='method.push' class="method"><span id='push.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.push' class='fnname'>push</a><I, S>(&mut self, streamable: I) <span class="where fmt-newline">where<br> I: for<'a> <a class="trait" href="../../fst/trait.IntoStreamer.html" title="trait fst::IntoStreamer">IntoStreamer</a><'a, Into = S, Item = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&'a [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>>,<br> S: 's + for<'a> <a class="trait" href="../../fst/trait.Streamer.html" title="trait fst::Streamer">Streamer</a><'a, Item = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&'a [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>>, </span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/fst/set.rs.html#638-642' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Add a stream to this set operation.</p>
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<p>The stream must emit a lexicographically ordered sequence of byte
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strings.</p>
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</div><h4 id='method.union' class="method"><span id='union.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.union' class='fnname'>union</a>(self) -> <a class="struct" href="../../fst/set/struct.Union.html" title="struct fst::set::Union">Union</a><'s></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/fst/set.rs.html#662-664' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Performs a union operation on all streams that have been added.</p>
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<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">fst</span>::{<span class="ident">IntoStreamer</span>, <span class="ident">Streamer</span>, <span class="ident">Set</span>};
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<span class="kw">let</span> <span class="ident">set1</span> <span class="op">=</span> <span class="ident">Set</span>::<span class="ident">from_iter</span>(<span class="kw-2">&</span>[<span class="string">"a"</span>, <span class="string">"b"</span>, <span class="string">"c"</span>]).<span class="ident">unwrap</span>();
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<span class="kw">let</span> <span class="ident">set2</span> <span class="op">=</span> <span class="ident">Set</span>::<span class="ident">from_iter</span>(<span class="kw-2">&</span>[<span class="string">"a"</span>, <span class="string">"y"</span>, <span class="string">"z"</span>]).<span class="ident">unwrap</span>();
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">union</span> <span class="op">=</span> <span class="ident">set1</span>.<span class="ident">op</span>().<span class="ident">add</span>(<span class="kw-2">&</span><span class="ident">set2</span>).<span class="ident">union</span>();
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">keys</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[];
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<span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">key</span>) <span class="op">=</span> <span class="ident">union</span>.<span class="ident">next</span>() {
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<span class="ident">keys</span>.<span class="ident">push</span>(<span class="ident">key</span>.<span class="ident">to_vec</span>());
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}
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">keys</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">b"a"</span>, <span class="string">b"b"</span>, <span class="string">b"c"</span>, <span class="string">b"y"</span>, <span class="string">b"z"</span>]);</pre>
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</div><h4 id='method.intersection' class="method"><span id='intersection.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.intersection' class='fnname'>intersection</a>(self) -> <a class="struct" href="../../fst/set/struct.Intersection.html" title="struct fst::set::Intersection">Intersection</a><'s></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/fst/set.rs.html#684-686' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Performs an intersection operation on all streams that have been added.</p>
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<h1 id="example-1" class="section-header"><a href="#example-1">Example</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">fst</span>::{<span class="ident">IntoStreamer</span>, <span class="ident">Streamer</span>, <span class="ident">Set</span>};
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<span class="kw">let</span> <span class="ident">set1</span> <span class="op">=</span> <span class="ident">Set</span>::<span class="ident">from_iter</span>(<span class="kw-2">&</span>[<span class="string">"a"</span>, <span class="string">"b"</span>, <span class="string">"c"</span>]).<span class="ident">unwrap</span>();
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<span class="kw">let</span> <span class="ident">set2</span> <span class="op">=</span> <span class="ident">Set</span>::<span class="ident">from_iter</span>(<span class="kw-2">&</span>[<span class="string">"a"</span>, <span class="string">"y"</span>, <span class="string">"z"</span>]).<span class="ident">unwrap</span>();
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">intersection</span> <span class="op">=</span> <span class="ident">set1</span>.<span class="ident">op</span>().<span class="ident">add</span>(<span class="kw-2">&</span><span class="ident">set2</span>).<span class="ident">intersection</span>();
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">keys</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[];
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<span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">key</span>) <span class="op">=</span> <span class="ident">intersection</span>.<span class="ident">next</span>() {
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<span class="ident">keys</span>.<span class="ident">push</span>(<span class="ident">key</span>.<span class="ident">to_vec</span>());
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}
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">keys</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">b"a"</span>]);</pre>
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</div><h4 id='method.difference' class="method"><span id='difference.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.difference' class='fnname'>difference</a>(self) -> <a class="struct" href="../../fst/set/struct.Difference.html" title="struct fst::set::Difference">Difference</a><'s></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/fst/set.rs.html#708-710' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Performs a difference operation with respect to the first stream added.
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That is, this returns a stream of all elements in the first stream
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that don't exist in any other stream that has been added.</p>
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<h1 id="example-2" class="section-header"><a href="#example-2">Example</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">fst</span>::{<span class="ident">IntoStreamer</span>, <span class="ident">Streamer</span>, <span class="ident">Set</span>};
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<span class="kw">let</span> <span class="ident">set1</span> <span class="op">=</span> <span class="ident">Set</span>::<span class="ident">from_iter</span>(<span class="kw-2">&</span>[<span class="string">"a"</span>, <span class="string">"b"</span>, <span class="string">"c"</span>]).<span class="ident">unwrap</span>();
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<span class="kw">let</span> <span class="ident">set2</span> <span class="op">=</span> <span class="ident">Set</span>::<span class="ident">from_iter</span>(<span class="kw-2">&</span>[<span class="string">"a"</span>, <span class="string">"y"</span>, <span class="string">"z"</span>]).<span class="ident">unwrap</span>();
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">difference</span> <span class="op">=</span> <span class="ident">set1</span>.<span class="ident">op</span>().<span class="ident">add</span>(<span class="kw-2">&</span><span class="ident">set2</span>).<span class="ident">difference</span>();
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">keys</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[];
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<span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">key</span>) <span class="op">=</span> <span class="ident">difference</span>.<span class="ident">next</span>() {
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<span class="ident">keys</span>.<span class="ident">push</span>(<span class="ident">key</span>.<span class="ident">to_vec</span>());
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}
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">keys</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">b"b"</span>, <span class="string">b"c"</span>]);</pre>
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</div><h4 id='method.symmetric_difference' class="method"><span id='symmetric_difference.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.symmetric_difference' class='fnname'>symmetric_difference</a>(self) -> <a class="struct" href="../../fst/set/struct.SymmetricDifference.html" title="struct fst::set::SymmetricDifference">SymmetricDifference</a><'s></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/fst/set.rs.html#737-739' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Performs a symmetric difference operation on all of the streams that
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have been added.</p>
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<p>When there are only two streams, then the keys returned correspond to
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keys that are in either stream but <em>not</em> in both streams.</p>
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<p>More generally, for any number of streams, keys that occur in an odd
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number of streams are returned.</p>
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<h1 id="example-3" class="section-header"><a href="#example-3">Example</a></h1>
|
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">fst</span>::{<span class="ident">IntoStreamer</span>, <span class="ident">Streamer</span>, <span class="ident">Set</span>};
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<span class="kw">let</span> <span class="ident">set1</span> <span class="op">=</span> <span class="ident">Set</span>::<span class="ident">from_iter</span>(<span class="kw-2">&</span>[<span class="string">"a"</span>, <span class="string">"b"</span>, <span class="string">"c"</span>]).<span class="ident">unwrap</span>();
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<span class="kw">let</span> <span class="ident">set2</span> <span class="op">=</span> <span class="ident">Set</span>::<span class="ident">from_iter</span>(<span class="kw-2">&</span>[<span class="string">"a"</span>, <span class="string">"y"</span>, <span class="string">"z"</span>]).<span class="ident">unwrap</span>();
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">sym_difference</span> <span class="op">=</span> <span class="ident">set1</span>.<span class="ident">op</span>().<span class="ident">add</span>(<span class="kw-2">&</span><span class="ident">set2</span>).<span class="ident">symmetric_difference</span>();
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">keys</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[];
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<span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">key</span>) <span class="op">=</span> <span class="ident">sym_difference</span>.<span class="ident">next</span>() {
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<span class="ident">keys</span>.<span class="ident">push</span>(<span class="ident">key</span>.<span class="ident">to_vec</span>());
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}
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">keys</span>, <span class="macro">vec</span><span class="macro">!</span>[<span class="string">b"b"</span>, <span class="string">b"c"</span>, <span class="string">b"y"</span>, <span class="string">b"z"</span>]);</pre>
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</div></div>
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<h2 id='implementations' class='small-section-header'>
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Trait Implementations<a href='#implementations' class='anchor'></a>
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</h2>
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<div id='implementations-list'><h3 id='impl-Extend%3CI%3E' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<'f, I, S> <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/trait.Extend.html" title="trait core::iter::traits::Extend">Extend</a><I> for <a class="struct" href="../../fst/set/struct.OpBuilder.html" title="struct fst::set::OpBuilder">OpBuilder</a><'f> <span class="where fmt-newline">where<br> I: for<'a> <a class="trait" href="../../fst/trait.IntoStreamer.html" title="trait fst::IntoStreamer">IntoStreamer</a><'a, Into = S, Item = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&'a [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>>,<br> S: 'f + for<'a> <a class="trait" href="../../fst/trait.Streamer.html" title="trait fst::Streamer">Streamer</a><'a, Item = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&'a [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a>>, </span></code><a href='#impl-Extend%3CI%3E' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/fst/set.rs.html#742-750' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.extend' class="method"><span id='extend.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/iter/traits/trait.Extend.html#tymethod.extend' class='fnname'>extend</a><T>(&mut self, it: T) <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/trait.IntoIterator.html" title="trait core::iter::traits::IntoIterator">IntoIterator</a><Item = I>, </span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/fst/set.rs.html#745-749' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Extends a collection with the contents of an iterator. <a href="https://doc.rust-lang.org/nightly/core/iter/traits/trait.Extend.html#tymethod.extend">Read more</a></p>
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