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<td >Qt 5.9</td><td ><a href="qtcore-index.html">Qt Core</a></td><td ><a href="qtcore-module.html">C++ Classes</a></td><td >QSequentialIterable</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#public-types">Public Types</a></li>
<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">QSequentialIterable Class</h1>
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<p>The <a href="qsequentialiterable.html">QSequentialIterable</a> class is an iterable interface for a container in a <a href="qvariant.html">QVariant</a>. <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 <QSequentialIterable></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 5.2</td></tr></table></div><ul>
<li><a href="qsequentialiterable-members.html">List of all members, including inherited members</a></li>
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<a name="public-types"></a>
<h2 id="public-types">Public Types</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> class </td><td class="memItemRight bottomAlign"><b><a href="qsequentialiterable-const-iterator.html">const_iterator</a></b></td></tr>
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<h2 id="public-functions">Public Functions</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> QVariant </td><td class="memItemRight bottomAlign"><b><a href="qsequentialiterable.html#at">at</a></b>(int <i>idx</i>) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> const_iterator </td><td class="memItemRight bottomAlign"><b><a href="qsequentialiterable.html#begin">begin</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qsequentialiterable.html#canReverseIterate">canReverseIterate</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> const_iterator </td><td class="memItemRight bottomAlign"><b><a href="qsequentialiterable.html#end">end</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qsequentialiterable.html#size">size</a></b>() const</td></tr>
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<h2 id="details">Detailed Description</h2>
<p>The <a href="qsequentialiterable.html">QSequentialIterable</a> class is an iterable interface for a container in a <a href="qvariant.html">QVariant</a>.</p>
<p>This class allows several methods of accessing the elements of a container held within a <a href="qvariant.html">QVariant</a>. An instance of <a href="qsequentialiterable.html">QSequentialIterable</a> can be extracted from a <a href="qvariant.html">QVariant</a> if it can be converted to a <a href="qvariant.html#QVariantList-typedef">QVariantList</a>.</p>
<pre class="cpp">
<span class="type"><a href="qlist.html">QList</a></span><span class="operator"><</span><span class="type">int</span><span class="operator">></span> intList <span class="operator">=</span> {<span class="number">7</span><span class="operator">,</span> <span class="number">11</span><span class="operator">,</span> <span class="number">42</span>};
<span class="type"><a href="qvariant.html">QVariant</a></span> variant <span class="operator">=</span> <span class="type"><a href="qvariant.html">QVariant</a></span><span class="operator">::</span>fromValue(intList);
<span class="keyword">if</span> (variant<span class="operator">.</span>canConvert<span class="operator"><</span><span class="type"><a href="qvariant.html#QVariantList-typedef">QVariantList</a></span><span class="operator">></span>()) {
<span class="type">QSequentialIterable</span> iterable <span class="operator">=</span> variant<span class="operator">.</span>value<span class="operator"><</span><span class="type">QSequentialIterable</span><span class="operator">></span>();
<span class="comment">// Can use foreach:</span>
foreach (<span class="keyword">const</span> <span class="type"><a href="qvariant.html">QVariant</a></span> <span class="operator">&</span>v<span class="operator">,</span> iterable) {
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> v;
}
<span class="comment">// Can use C++11 range-for:</span>
<span class="keyword">for</span> (<span class="keyword">const</span> <span class="type"><a href="qvariant.html">QVariant</a></span> <span class="operator">&</span>v : iterable) {
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> v;
}
<span class="comment">// Can use iterators:</span>
<span class="type">QSequentialIterable</span><span class="operator">::</span>const_iterator it <span class="operator">=</span> iterable<span class="operator">.</span>begin();
<span class="keyword">const</span> <span class="type">QSequentialIterable</span><span class="operator">::</span>const_iterator end <span class="operator">=</span> iterable<span class="operator">.</span>end();
<span class="keyword">for</span> ( ; it <span class="operator">!</span><span class="operator">=</span> end; <span class="operator">+</span><span class="operator">+</span>it) {
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> <span class="operator">*</span>it;
}
}
</pre>
<p>The container itself is not copied before iterating over it.</p>
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<p><b>See also </b><a href="qvariant.html">QVariant</a>.</p>
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<div class="func">
<h2>Member Function Documentation</h2>
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<h3 class="fn" id="at"><a name="at"></a><span class="type"><a href="qvariant.html">QVariant</a></span> QSequentialIterable::<span class="name">at</span>(<span class="type">int</span> <i>idx</i>) const</h3>
<p>Returns the element at position <i>idx</i> in the container.</p>
<!-- @@@at -->
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<h3 class="fn" id="begin"><a name="begin"></a><span class="type"><a href="qsequentialiterable-const-iterator.html">const_iterator</a></span> QSequentialIterable::<span class="name">begin</span>() const</h3>
<p>Returns a <a href="qsequentialiterable-const-iterator.html">QSequentialIterable::const_iterator</a> for the beginning of the container. This can be used in stl-style iteration.</p>
<p><b>See also </b><a href="qsequentialiterable.html#end">end</a>().</p>
<!-- @@@begin -->
<!-- $$$canReverseIterate[overload1]$$$canReverseIterate -->
<h3 class="fn" id="canReverseIterate"><a name="canReverseIterate"></a><span class="type">bool</span> QSequentialIterable::<span class="name">canReverseIterate</span>() const</h3>
<p>Returns whether it is possible to iterate over the container in reverse. This corresponds to the std::bidirectional_iterator_tag iterator trait of the <a href="qsequentialiterable-const-iterator.html">const_iterator</a> of the container.</p>
<!-- @@@canReverseIterate -->
<!-- $$$end[overload1]$$$end -->
<h3 class="fn" id="end"><a name="end"></a><span class="type"><a href="qsequentialiterable-const-iterator.html">const_iterator</a></span> QSequentialIterable::<span class="name">end</span>() const</h3>
<p>Returns a <a href="qsequentialiterable-const-iterator.html">QSequentialIterable::const_iterator</a> for the end of the container. This can be used in stl-style iteration.</p>
<p><b>See also </b><a href="qsequentialiterable.html#begin">begin</a>().</p>
<!-- @@@end -->
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<h3 class="fn" id="size"><a name="size"></a><span class="type">int</span> QSequentialIterable::<span class="name">size</span>() const</h3>
<p>Returns the number of elements in the container.</p>
<!-- @@@size -->
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