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libstdc++-docs-8.4.0-1.mga7.noarch.rpm

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<div class="title">std::__detail::_Hashtable_traits&lt; _Cache_hash_code, _Constant_iterators, _Unique_keys &gt; Struct Template Reference<div class="ingroups"><a class="el" href="a01463.html">Containers</a> &raquo; <a class="el" href="a01466.html">Unordered Associative</a> &raquo; <a class="el" href="a01491.html">Base and Implementation Classes</a></div></div>  </div>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>__constant_iterators</b> = <a class="el" href="a03043.html">__bool_constant</a>&lt; _Constant_iterators &gt;</td></tr>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>__hash_cached</b> = <a class="el" href="a03043.html">__bool_constant</a>&lt; _Cache_hash_code &gt;</td></tr>
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using&#160;</td><td class="memItemRight" valign="bottom"><b>__unique_keys</b> = <a class="el" href="a03043.html">__bool_constant</a>&lt; _Unique_keys &gt;</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><h3>template&lt;bool _Cache_hash_code, bool _Constant_iterators, bool _Unique_keys&gt;<br />
struct std::__detail::_Hashtable_traits&lt; _Cache_hash_code, _Constant_iterators, _Unique_keys &gt;</h3>

<p>struct _Hashtable_traits</p>
<p>Important traits for hash tables.</p>
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    <tr><td class="paramname">_Cache_hash_code</td><td>Boolean value. True if the value of the hash function is stored along with the value. This is a time-space tradeoff. Storing it may improve lookup speed by reducing the number of times we need to call the _Equal function.</td></tr>
    <tr><td class="paramname">_Constant_iterators</td><td>Boolean value. True if iterator and const_iterator are both constant iterator types. This is true for unordered_set and unordered_multiset, false for unordered_map and unordered_multimap.</td></tr>
    <tr><td class="paramname">_Unique_keys</td><td>Boolean value. True if the return value of _Hashtable::count(k) is always at most one, false if it may be an arbitrary number. This is true for unordered_set and unordered_map, false for unordered_multiset and unordered_multimap. </td></tr>
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<p class="definition">Definition at line <a class="el" href="a00374_source.html#l00200">200</a> of file <a class="el" href="a00374_source.html">hashtable_policy.h</a>.</p>
</div><hr/>The documentation for this struct was generated from the following file:<ul>
<li><a class="el" href="a00374_source.html">hashtable_policy.h</a></li>
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