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<td >Qt 5.12</td><td ><a href="qtcore-index.html">Qt Core</a></td><td ><a href="qtcore-module.html">C++ Classes</a></td><td >QKeyValueIterator</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qtcore-index.html">Qt 5.12.6 Reference Documentation</a></td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#related-non-members">Related Non-Members</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">QKeyValueIterator Class</h1>
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<p>Iterator over the key/value pairs of an associative container. <a href="#details">More...</a></p>
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<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include <QKeyValueIterator></span>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += core</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Since:</td><td class="memItemRight bottomAlign"> Qt 5.10</td></tr></table></div><ul>
<li><a href="qkeyvalueiterator-members.html">List of all members, including inherited members</a></li>
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<a name="public-functions"></a>
<h2 id="public-functions">Public Functions</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qkeyvalueiterator.html#QKeyValueIterator">QKeyValueIterator</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qkeyvalueiterator.html#QKeyValueIterator-1">QKeyValueIterator</a></b>(Iterator <i>o</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> Iterator </td><td class="memItemRight bottomAlign"><b><a href="qkeyvalueiterator.html#base">base</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> std::pair<Key, T> </td><td class="memItemRight bottomAlign"><b><a href="qkeyvalueiterator.html#operator-2a">operator*</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QKeyValueIterator<Key, T, Iterator> &</td><td class="memItemRight bottomAlign"><b><a href="qkeyvalueiterator.html#operator-2b-2b">operator++</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QKeyValueIterator<Key, T, Iterator> </td><td class="memItemRight bottomAlign"><b><a href="qkeyvalueiterator.html#operator-2b-2b-1">operator++</a></b>(<i>int</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QKeyValueIterator<Key, T, Iterator> &</td><td class="memItemRight bottomAlign"><b><a href="qkeyvalueiterator.html#operator--">operator--</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QKeyValueIterator<Key, T, Iterator> </td><td class="memItemRight bottomAlign"><b><a href="qkeyvalueiterator.html#operator---1">operator--</a></b>(<i>int</i>)</td></tr>
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<h2 id="related-non-members">Related Non-Members</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qkeyvalueiterator.html#operator-not-eq">operator!=</a></b>(QKeyValueIterator<Key, T, Iterator> <i>lhs</i>, QKeyValueIterator<Key, T, Iterator> <i>rhs</i>)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qkeyvalueiterator.html#operator-eq-eq">operator==</a></b>(QKeyValueIterator<Key, T, Iterator> <i>lhs</i>, QKeyValueIterator<Key, T, Iterator> <i>rhs</i>)</td></tr>
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<h2 id="details">Detailed Description</h2>
<p>Iterator over the key/value pairs of an associative container.</p>
<p>The <a href="qkeyvalueiterator.html">QKeyValueIterator</a> class provides an STL-style iterator for returning key/value pairs from associative containers like <a href="qhash.html#qhash">QHash</a> and <a href="qmap.html">QMap</a>. It supports the same API as the STL associative containers, i.e. getting a key/value pair when iterating through the container.</p>
<p>This will allow for better interoperability between <a href="qmap.html">QMap</a>, <a href="qhash.html#qhash">QHash</a> and friends and STL-style algorithms.</p>
<p><b>Warning:</b> Iterators on implicitly shared containers do not work exactly like STL-iterators. You should avoid copying a container while iterators are active on that container. For more information, read <a href="containers.html#implicit-sharing-iterator-problem">Implicit sharing iterator problem</a>.</p>
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<h2>Member Function Documentation</h2>
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<h3 class="fn" id="QKeyValueIterator"><a name="QKeyValueIterator"></a>QKeyValueIterator::<span class="name">QKeyValueIterator</span>()</h3>
<p>Constructs a default <a href="qkeyvalueiterator.html">QKeyValueIterator</a>.</p>
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<h3 class="fn" id="QKeyValueIterator-1"><a name="QKeyValueIterator-1"></a>QKeyValueIterator::<span class="name">QKeyValueIterator</span>(<span class="type">Iterator</span> <i>o</i>)</h3>
<p>Constructs a <a href="qkeyvalueiterator.html">QKeyValueIterator</a> on top of <i>o</i>.</p>
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<h3 class="fn" id="base"><a name="base"></a><span class="type">Iterator</span> QKeyValueIterator::<span class="name">base</span>() const</h3>
<p>Returns the underlying iterator this <a href="qkeyvalueiterator.html">QKeyValueIterator</a> is based on.</p>
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<h3 class="fn" id="operator-2a"><a name="operator-2a"></a><span class="type">std::pair</span><<span class="type">Key</span>, <span class="type">T</span>> QKeyValueIterator::<span class="name">operator*</span>() const</h3>
<p>Returns the current entry as a pair.</p>
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<h3 class="fn" id="operator-2b-2b"><a name="operator-2b-2b"></a><span class="type"><a href="qkeyvalueiterator.html#QKeyValueIterator">QKeyValueIterator</a></span><<span class="type">Key</span>, <span class="type">T</span>, <span class="type">Iterator</span>> &QKeyValueIterator::<span class="name">operator++</span>()</h3>
<p>The prefix ++ operator (<code>++i</code>) advances the iterator to the next item in the container and returns the iterator.</p>
<p><b>Note: </b>Advancing the iterator past its container's end() constitutes undefined behavior.</p><p><b>See also </b><a href="qkeyvalueiterator.html#operator--">operator--</a>().</p>
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<h3 class="fn" id="operator-2b-2b-1"><a name="operator-2b-2b-1"></a><span class="type"><a href="qkeyvalueiterator.html#QKeyValueIterator">QKeyValueIterator</a></span><<span class="type">Key</span>, <span class="type">T</span>, <span class="type">Iterator</span>> QKeyValueIterator::<span class="name">operator++</span>(<i>int</i>)</h3>
<p>This is an overloaded function.</p>
<p>The postfix ++ operator (<code>i++</code>) advances the iterator to the next item in the container and returns the iterator's prior value.</p>
<p><b>Note: </b>Advancing the iterator past its container's end() constitutes undefined behavior.</p><!-- @@@operator++ -->
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<h3 class="fn" id="operator--"><a name="operator--"></a><span class="type"><a href="qkeyvalueiterator.html#QKeyValueIterator">QKeyValueIterator</a></span><<span class="type">Key</span>, <span class="type">T</span>, <span class="type">Iterator</span>> &QKeyValueIterator::<span class="name">operator--</span>()</h3>
<p>The prefix -- operator (<code>--i</code>) backs the iterator up to the previous item in the container and returns the iterator.</p>
<p><b>Note: </b>Backing up an iterator to before its container's begin() constitutes undefined behavior.</p><p><b>See also </b><a href="qkeyvalueiterator.html#operator-2b-2b">operator++</a>().</p>
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<h3 class="fn" id="operator---1"><a name="operator---1"></a><span class="type"><a href="qkeyvalueiterator.html#QKeyValueIterator">QKeyValueIterator</a></span><<span class="type">Key</span>, <span class="type">T</span>, <span class="type">Iterator</span>> QKeyValueIterator::<span class="name">operator--</span>(<i>int</i>)</h3>
<p>This is an overloaded function.</p>
<p>The postfix -- operator (<code>i--</code>) backs the iterator up to the previous item in the container and returns the iterator's prior value.</p>
<p><b>Note: </b>Backing up an iterator to before its container's begin() constitutes undefined behavior.</p><!-- @@@operator-- -->
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<div class="relnonmem">
<h2>Related Non-Members</h2>
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<h3 class="fn" id="operator-not-eq"><a name="operator-not-eq"></a><span class="type">bool</span> <span class="name">operator!=</span>(<span class="type"><a href="qkeyvalueiterator.html#QKeyValueIterator">QKeyValueIterator</a></span><<span class="type">Key</span>, <span class="type">T</span>, <span class="type">Iterator</span>> <i>lhs</i>, <span class="type"><a href="qkeyvalueiterator.html#QKeyValueIterator">QKeyValueIterator</a></span><<span class="type">Key</span>, <span class="type">T</span>, <span class="type">Iterator</span>> <i>rhs</i>)</h3>
<p>Returns <code>true</code> if <i>rhs</i> points to a different item than <i>lhs</i> otherwise returns <code>false</code>.</p>
<p><b>See also </b><a href="qchar.html#operator-eq-eq">operator==</a>().</p>
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<h3 class="fn" id="operator-eq-eq"><a name="operator-eq-eq"></a><span class="type">bool</span> <span class="name">operator==</span>(<span class="type"><a href="qkeyvalueiterator.html#QKeyValueIterator">QKeyValueIterator</a></span><<span class="type">Key</span>, <span class="type">T</span>, <span class="type">Iterator</span>> <i>lhs</i>, <span class="type"><a href="qkeyvalueiterator.html#QKeyValueIterator">QKeyValueIterator</a></span><<span class="type">Key</span>, <span class="type">T</span>, <span class="type">Iterator</span>> <i>rhs</i>)</h3>
<p>Returns <code>true</code> if <i>rhs</i> points to the same item as <i>lhs</i> otherwise returns <code>false</code>.</p>
<p><b>See also </b><a href="qchar.html#operator-not-eq">operator!=</a>().</p>
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