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concept
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<a href="#">Eq</a>
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<div class="concept">
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<h1 class="section-header">
<span>
Concept
</span>
<a class="project-name" href="index.html">Subspace</a>
<span class="namespace-dots">::</span>
<a class="namespace-name" href="namespace.sus.html">sus</a>
<span class="namespace-dots">::</span>
<a class="namespace-name" href="sus-namespace.cmp.html">cmp</a>
<span class="namespace-dots">::</span>
<a class="concept-name" href="#">Eq</a>
</h1>
<div class="type-signature"><div class="src rightside"><a href="https://github.com/chromium/subspace/blob/main/sus/cmp/eq.h#L43">source</a></div><pre class="template">template <class T, class U = T></pre><span class="concept">
concept
</span><span class="type-name">
Eq
</span><div>
<div class="requires">
<span class="requires-keyword keyword">
requires
</span>
<div class="requires-constraint"><pre class="requires-constraint-line">requires(const std::remove_reference_t<T>& lhs,</pre><pre class="requires-constraint-line"> const std::remove_reference_t<U>& rhs) {</pre><pre class="requires-constraint-line"> { lhs == rhs } -> std::same_as<bool>;</pre><pre class="requires-constraint-line"> { lhs != rhs } -> std::same_as<bool>;</pre><pre class="requires-constraint-line">}</pre></div>
</div>
</div></div>
<div class="description long">
<p>Concept for types that can be compared for equality with the <code>==</code> and <code>!=</code>
operators. There is no guarantee of a full equivalence relation, and a
partial equivalence is possible, which allows for values that compare
not-equal to themselves (such as NaN).</p>
<p>Implementations must ensure that <code>operator==</code> and <code>operator!=</code> are
consistent with each other:</p>
<ul>
<li><code>a != b</code> if and only if <code>!(a == b)</code>.</li>
</ul>
<p>The default implementation of <code>operator!=</code> provides this consistency
and is almost always sufficient. It should not be overridden without very
good reason.</p>
<p>This maps to the <a href="https://doc.rust-lang.org/stable/std/cmp/trait.PartialEq.html"><code>PartialEq</code></a> trait in Rust
rather than the <code>Eq</code> trait. Since C++ does not understand
equivalent vs partial equivalence, we are unable to differentiate and
provide a stronger relationship than partial equivalence.</p>
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