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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 >QStaticByteArrayMatcher</td></tr></table><table class="buildversion"><tr>
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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">QStaticByteArrayMatcher Class</h1>
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<p>The <a href="qstaticbytearraymatcher.html">QStaticByteArrayMatcher</a> class is a compile-time version of <a href="qbytearraymatcher.html">QByteArrayMatcher</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 &lt;QStaticByteArrayMatcher&gt;</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 5.9</td></tr></table></div><ul>
<li><a href="qstaticbytearraymatcher-members.html">List of all members, including inherited members</a></li>
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<h2 id="public-functions">Public Functions</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qstaticbytearraymatcher.html#indexIn">indexIn</a></b>(const QByteArray &amp;<i>haystack</i>, int <i>from</i> = ...) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> int </td><td class="memItemRight bottomAlign"><b><a href="qstaticbytearraymatcher.html#indexIn-1">indexIn</a></b>(const char *<i>haystack</i>, int <i>hlen</i>, int <i>from</i> = ...) const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QByteArray </td><td class="memItemRight bottomAlign"><b><a href="qstaticbytearraymatcher.html#pattern">pattern</a></b>() const</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"> QStaticByteArrayMatcher&lt;N&gt; </td><td class="memItemRight bottomAlign"><b><a href="qstaticbytearraymatcher.html#qMakeStaticByteArrayMatcher">qMakeStaticByteArrayMatcher</a></b>(const char (&amp;)[N] <i>pattern</i> = N)</td></tr>
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<h2 id="details">Detailed Description</h2>
<p>The <a href="qstaticbytearraymatcher.html">QStaticByteArrayMatcher</a> class is a compile-time version of <a href="qbytearraymatcher.html">QByteArrayMatcher</a>.</p>
<p>This class is useful when you have a sequence of bytes that you want to repeatedly match against some byte arrays (perhaps in a loop), or when you want to search for the same sequence of bytes multiple times in the same byte array. Using a matcher object and <a href="qstaticbytearraymatcher.html#indexIn">indexIn</a>() is faster than matching a plain <a href="qbytearray.html">QByteArray</a> with <a href="qbytearray.html#indexOf">QByteArray::indexOf</a>(), in particular if repeated matching takes place.</p>
<p>Unlike <a href="qbytearraymatcher.html">QByteArrayMatcher</a>, this class calculates the internal representation at <i>compile-time</i>, if your compiler supports C++14-level <code>constexpr</code> (C++11 is not sufficient), so it can even benefit if you are doing one-off byte array matches.</p>
<p>Create the <a href="qstaticbytearraymatcher.html">QStaticByteArrayMatcher</a> by calling <a href="qstaticbytearraymatcher.html#qMakeStaticByteArrayMatcher">qMakeStaticByteArrayMatcher</a>(), passing it the C string literal you want to search for. Store the return value of that function in a <code>static const auto</code> variable, so you don't need to pass the <code>N</code> template parameter explicitly:</p>
<pre class="cpp">

  <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">auto</span> matcher <span class="operator">=</span> <a href="qstaticbytearraymatcher.html#qMakeStaticByteArrayMatcher">qMakeStaticByteArrayMatcher</a>(<span class="string">&quot;needle&quot;</span>);

</pre>
<p>Then call <a href="qstaticbytearraymatcher.html#indexIn">indexIn</a>() on the <a href="qbytearray.html">QByteArray</a> in which you want to search, just like with <a href="qbytearraymatcher.html">QByteArrayMatcher</a>.</p>
<p>Since this class is designed to do all the up-front calculations at compile-time, it does not offer a setPattern() method.</p>
<p><b>Note: </b>Qt detects the necessary C++14 compiler support by way of the feature test recommendations from <a href="https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations">C++ Committee's Standing Document 6</a>.</p></div>
<p><b>See also </b><a href="qbytearraymatcher.html">QByteArrayMatcher</a> and <a href="qstringmatcher.html">QStringMatcher</a>.</p>
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<h2>Member Function Documentation</h2>
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<h3 class="fn" id="indexIn"><a name="indexIn"></a><span class="type">int</span> QStaticByteArrayMatcher::<span class="name">indexIn</span>(const <span class="type"><a href="qbytearray.html">QByteArray</a></span> &amp;<i>haystack</i>, <span class="type">int</span> <i>from</i> = ...) const</h3>
<p>Searches the char string <i>haystack</i>, from byte position <i>from</i> (default 0, i.e&#x2e; from the first byte), for the byte array <a href="qstaticbytearraymatcher.html#pattern">pattern</a>() that was set in the constructor.</p>
<p>Returns the position where the <a href="qstaticbytearraymatcher.html#pattern">pattern</a>() matched in <i>haystack</i>, or -1 if no match was found.</p>
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<h3 class="fn" id="indexIn-1"><a name="indexIn-1"></a><span class="type">int</span> QStaticByteArrayMatcher::<span class="name">indexIn</span>(const <span class="type">char</span> *<i>haystack</i>, <span class="type">int</span> <i>hlen</i>, <span class="type">int</span> <i>from</i> = ...) const</h3>
<p>Searches the char string <i>haystack</i>, which has length <i>hlen</i>, from byte position <i>from</i> (default 0, i.e&#x2e; from the first byte), for the byte array <a href="qstaticbytearraymatcher.html#pattern">pattern</a>() that was set in the constructor.</p>
<p>Returns the position where the <a href="qstaticbytearraymatcher.html#pattern">pattern</a>() matched in <i>haystack</i>, or -1 if no match was found.</p>
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<h3 class="fn" id="pattern"><a name="pattern"></a><span class="type"><a href="qbytearray.html">QByteArray</a></span> QStaticByteArrayMatcher::<span class="name">pattern</span>() const</h3>
<p>Returns the byte array pattern that this byte array matcher will search for.</p>
<p><b>See also </b><a href="qbytearraymatcher.html#setPattern">QByteArrayMatcher::setPattern</a>().</p>
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<h2>Related Non-Members</h2>
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<h3 class="fn" id="qMakeStaticByteArrayMatcher"><a name="qMakeStaticByteArrayMatcher"></a><span class="type">QStaticByteArrayMatcher</span>&lt;<span class="type">N</span>&gt; <span class="name">qMakeStaticByteArrayMatcher</span>(const <span class="type">char</span> (&amp;)[<span class="type">N</span>] <i>pattern</i> = N)</h3>
<p>Return a <a href="qstaticbytearraymatcher.html">QStaticByteArrayMatcher</a> with the correct <code>N</code> determined automatically from the <i>pattern</i> passed.</p>
<p>To take full advantage of this function, assign the result to an <code>auto</code> variable:</p>
<pre class="cpp">

  <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">auto</span> matcher <span class="operator">=</span> qMakeStaticByteArrayMatcher(<span class="string">&quot;needle&quot;</span>);

</pre>
<p>This function was introduced in  Qt 5.9.</p>
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