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<p class='location'>Enum UnifyVars</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#variants">Variants</a><div class="sidebar-links"><a href="#variant.Implicit">Implicit</a><a href="#variant.Explicit">Explicit</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Clone">Clone</a><a href="#impl-Debug">Debug</a><a href="#impl-Eq">Eq</a><a href="#impl-PartialEq">PartialEq</a></div></div><p class='location'><a href='../index.html'>edn</a>::<wbr><a href='index.html'>query</a></p><script>window.sidebarCurrent = {name: 'UnifyVars', ty: 'enum', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<h1 class='fqn'><span class='in-band'>Enum <a href='../index.html'>edn</a>::<wbr><a href='index.html'>query</a>::<wbr><a class="enum" href=''>UnifyVars</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/edn/query.rs.html#884-910' title='goto source code'>[src]</a></span></h1>
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<pre class='rust enum'>pub enum UnifyVars {
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Implicit,
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Explicit(<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/btree/set/struct.BTreeSet.html" title="struct alloc::btree::set::BTreeSet">BTreeSet</a><<a class="struct" href="../../edn/query/struct.Variable.html" title="struct edn::query::Variable">Variable</a>>),
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}</pre><h2 id='variants' class='variants small-section-header'>
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Variants<a href='#variants' class='anchor'></a></h2>
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<span id="variant.Implicit" class="variant small-section-header"><a href="#variant.Implicit" class="anchor field"></a><span id='Implicit.v' class='invisible'><code>Implicit</code></span></span><div class='docblock'><p><code>Implicit</code> means the variables in an <code>or</code> or <code>not</code> are derived from the enclosed pattern.
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DataScript regards these vars as 'free': these variables don't need to be bound by the
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enclosing environment.</p>
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<p>Datomic's documentation implies that all implicit variables are required:</p>
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<blockquote>
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<p>Datomic will attempt to push the or clause down until all necessary variables are bound,
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and will throw an exception if that is not possible.</p>
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</blockquote>
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<p>but that would render top-level <code>or</code> expressions (as used in Datomic's own examples!)
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impossible, so we assume that this is an error in the documentation.</p>
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<p>All contained 'arms' in an <code>or</code> with implicit variables must bind the same vars.</p>
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</div><span id="variant.Explicit" class="variant small-section-header"><a href="#variant.Explicit" class="anchor field"></a><span id='Explicit.v' class='invisible'><code>Explicit(<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/btree/set/struct.BTreeSet.html" title="struct alloc::btree::set::BTreeSet">BTreeSet</a><<a class="struct" href="../../edn/query/struct.Variable.html" title="struct edn::query::Variable">Variable</a>>)</code></span></span><div class='docblock'><p><code>Explicit</code> means the variables in an <code>or-join</code> or <code>not-join</code> are explicitly listed,
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specified with <code>required-vars</code> syntax.</p>
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<p>DataScript parses these as free, but allows (incorrectly) the use of more complicated
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<code>rule-vars</code> syntax.</p>
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<p>Only the named variables will be unified with the enclosing query.</p>
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<p>Every 'arm' in an <code>or-join</code> must mention the entire set of explicit vars.</p>
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</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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<h3 id='impl-Clone' class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="enum" href="../../edn/query/enum.UnifyVars.html" title="enum edn::query::UnifyVars">UnifyVars</a></code><a href='#impl-Clone' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/edn/query.rs.html#883' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.clone' class="method"><span id='clone.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone' class='fnname'>clone</a>(&self) -> <a class="enum" href="../../edn/query/enum.UnifyVars.html" title="enum edn::query::UnifyVars">UnifyVars</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/edn/query.rs.html#883' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Returns a copy of the value. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone">Read more</a></p>
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</div><h4 id='method.clone_from' class="method"><span id='clone_from.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from' class='fnname'>clone_from</a>(&mut self, source: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>Self)</code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/clone.rs.html#112-114' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Performs copy-assignment from <code>source</code>. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from">Read more</a></p>
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</div></div><h3 id='impl-Debug' class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="enum" href="../../edn/query/enum.UnifyVars.html" title="enum edn::query::UnifyVars">UnifyVars</a></code><a href='#impl-Debug' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/edn/query.rs.html#883' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, __arg_0: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/edn/query.rs.html#883' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
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</div></div><h3 id='impl-Eq' class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> for <a class="enum" href="../../edn/query/enum.UnifyVars.html" title="enum edn::query::UnifyVars">UnifyVars</a></code><a href='#impl-Eq' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/edn/query.rs.html#883' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'></div><h3 id='impl-PartialEq' class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a> for <a class="enum" href="../../edn/query/enum.UnifyVars.html" title="enum edn::query::UnifyVars">UnifyVars</a></code><a href='#impl-PartialEq' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/edn/query.rs.html#883' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.eq' class="method"><span id='eq.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq' class='fnname'>eq</a>(&self, __arg_0: &<a class="enum" href="../../edn/query/enum.UnifyVars.html" title="enum edn::query::UnifyVars">UnifyVars</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/edn/query.rs.html#883' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>This method tests for <code>self</code> and <code>other</code> values to be equal, and is used by <code>==</code>. <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq">Read more</a></p>
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</div><h4 id='method.ne' class="method"><span id='ne.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#method.ne' class='fnname'>ne</a>(&self, __arg_0: &<a class="enum" href="../../edn/query/enum.UnifyVars.html" title="enum edn::query::UnifyVars">UnifyVars</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/edn/query.rs.html#883' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>This method tests for <code>!=</code>.</p>
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