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<h1 class="title">QDebug Class Reference</h1>
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<!-- $$$QDebug-brief -->
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<p>The QDebug class provides an output stream for debugging information. <a href="#details">More...</a></p>
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<!-- @@@QDebug -->
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<pre class="cpp"> <span class="preprocessor">#include <QDebug></span></pre><ul>
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<li><a href="qdebug-members.html">List of all members, including inherited members</a></li>
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<a name="public-functions"></a>
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<h2>Public Functions</h2>
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<table class="alignedsummary">
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#QDebugx">QDebug</a></b> ( QIODevice * <i>device</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#QDebug-2">QDebug</a></b> ( QString * <i>string</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#QDebug-3">QDebug</a></b> ( QtMsgType <i>type</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#QDebug-4">QDebug</a></b> ( const QDebug & <i>other</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#dtor.QDebug">~QDebug</a></b> ()</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#maybeSpace">maybeSpace</a></b> ()</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#nospace">nospace</a></b> ()</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#space">space</a></b> ()</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt">operator<<</a></b> ( QChar <i>t</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-3">operator<<</a></b> ( bool <i>t</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-4">operator<<</a></b> ( char <i>t</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-5">operator<<</a></b> ( signed short <i>i</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-6">operator<<</a></b> ( unsigned short <i>i</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-7">operator<<</a></b> ( signed int <i>i</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-8">operator<<</a></b> ( unsigned int <i>i</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-9">operator<<</a></b> ( signed long <i>l</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-10">operator<<</a></b> ( unsigned long <i>l</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-11">operator<<</a></b> ( qint64 <i>i</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-12">operator<<</a></b> ( quint64 <i>i</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-13">operator<<</a></b> ( float <i>f</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-14">operator<<</a></b> ( double <i>f</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-15">operator<<</a></b> ( const char * <i>s</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-16">operator<<</a></b> ( const QString & <i>s</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-17">operator<<</a></b> ( const QStringRef & <i>s</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-18">operator<<</a></b> ( const QLatin1String & <i>s</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-19">operator<<</a></b> ( const QByteArray & <i>b</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-lt-lt-20">operator<<</a></b> ( const void * <i>p</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> QDebug & </td><td class="memItemRight bottomAlign"><b><a href="qdebug.html#operator-eq">operator=</a></b> ( const QDebug & <i>other</i> )</td></tr>
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</table>
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<a name="details"></a>
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<!-- $$$QDebug-description -->
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<div class="descr">
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<h2>Detailed Description</h2>
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<p>The QDebug class provides an output stream for debugging information.</p>
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<p>QDebug is used whenever the developer needs to write out debugging or tracing information to a device, file, string or console.</p>
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<a name="basic-use"></a>
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<h3>Basic Use</h3>
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<p>In the common case, it is useful to call the <a href="qtglobal.html#qDebug">qDebug</a>() function to obtain a default QDebug object to use for writing debugging information.</p>
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<pre class="cpp"> <a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Date:"</span> <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="qdate.html">QDate</a></span><span class="operator">::</span>currentDate();
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<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Types:"</span> <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"String"</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="qchar.html">QChar</a></span>(<span class="char">'x'</span>) <span class="operator"><</span><span class="operator"><</span> <span class="type"><a href="qrect.html">QRect</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">10</span><span class="operator">,</span> <span class="number">50</span><span class="operator">,</span> <span class="number">40</span>);
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<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Custom coordinate type:"</span> <span class="operator"><</span><span class="operator"><</span> coordinate;</pre>
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<p>This constructs a QDebug object using the constructor that accepts a <a href="qtglobal.html#QtMsgType-enum">QtMsgType</a> value of <a href="qtglobal.html#QtMsgType-enum">QtDebugMsg</a>. Similarly, the <a href="qtglobal.html#qWarning">qWarning</a>(), <a href="qtglobal.html#qCritical">qCritical</a>() and <a href="qtglobal.html#qFatal">qFatal</a>() functions also return QDebug objects for the corresponding message types.</p>
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<p>The class also provides several constructors for other situations, including a constructor that accepts a <a href="qfile.html">QFile</a> or any other <a href="qiodevice.html">QIODevice</a> subclass that is used to write debugging information to files and other devices. The constructor that accepts a <a href="qstring.html">QString</a> is used to write to a string for display or serialization.</p>
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<a name="writing-custom-types-to-a-stream"></a>
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<h3>Writing Custom Types to a Stream</h3>
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<p>Many standard types can be written to QDebug objects, and Qt provides support for most Qt value types. To add support for custom types, you need to implement a streaming operator, as in the following example:</p>
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<pre class="cpp"> <span class="type">QDebug</span> <span class="keyword">operator</span><span class="operator"><</span><span class="operator"><</span>(<span class="type">QDebug</span> dbg<span class="operator">,</span> <span class="keyword">const</span> Coordinate <span class="operator">&</span>c)
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{
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dbg<span class="operator">.</span>nospace() <span class="operator"><</span><span class="operator"><</span> <span class="string">"("</span> <span class="operator"><</span><span class="operator"><</span> c<span class="operator">.</span>x() <span class="operator"><</span><span class="operator"><</span> <span class="string">", "</span> <span class="operator"><</span><span class="operator"><</span> c<span class="operator">.</span>y() <span class="operator"><</span><span class="operator"><</span> <span class="string">")"</span>;
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<span class="keyword">return</span> dbg<span class="operator">.</span>space();
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}</pre>
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<p>This is described in the <a href="debug.html">Debugging Techniques</a> and <a href="custom-types.html#making-the-type-printable">Creating Custom Qt Types</a> documents.</p>
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</div>
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<!-- @@@QDebug -->
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<div class="func">
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<h2>Member Function Documentation</h2>
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<!-- $$$QDebug[overload1]$$$QDebugQIODevice* -->
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<h3 class="fn"><a name="QDebugx"></a>QDebug::<span class="name">QDebug</span> ( <span class="type"><a href="qiodevice.html">QIODevice</a></span> * <i>device</i> )</h3>
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<p>Constructs a debug stream that writes to the given <i>device</i>.</p>
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<!-- @@@QDebug -->
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<!-- $$$QDebug$$$QDebugQString* -->
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<h3 class="fn"><a name="QDebug-2"></a>QDebug::<span class="name">QDebug</span> ( <span class="type"><a href="qstring.html">QString</a></span> * <i>string</i> )</h3>
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<p>Constructs a debug stream that writes to the given <i>string</i>.</p>
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<!-- @@@QDebug -->
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<!-- $$$QDebug$$$QDebugQtMsgType -->
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<h3 class="fn"><a name="QDebug-3"></a>QDebug::<span class="name">QDebug</span> ( <span class="type"><a href="qtglobal.html#QtMsgType-enum">QtMsgType</a></span> <i>type</i> )</h3>
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<p>Constructs a debug stream that writes to the handler for the message type specified by <i>type</i>.</p>
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<!-- @@@QDebug -->
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<!-- $$$QDebug$$$QDebugconstQDebug& -->
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<h3 class="fn"><a name="QDebug-4"></a>QDebug::<span class="name">QDebug</span> ( const <span class="type">QDebug</span> & <i>other</i> )</h3>
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<p>Constructs a copy of the <i>other</i> debug stream.</p>
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<!-- @@@QDebug -->
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<!-- $$$~QDebug[overload1]$$$~QDebug -->
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<h3 class="fn"><a name="dtor.QDebug"></a>QDebug::<span class="name">~QDebug</span> ()</h3>
|
|
<p>Flushes any pending data to be written and destroys the debug stream.</p>
|
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<!-- @@@~QDebug -->
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<!-- $$$maybeSpace[overload1]$$$maybeSpace -->
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<h3 class="fn"><a name="maybeSpace"></a><span class="type">QDebug</span> & QDebug::<span class="name">maybeSpace</span> ()</h3>
|
|
<p>Writes a space character to the debug stream, depending on the last character sent to the stream, and returns a reference to the stream.</p>
|
|
<p>If the last character was a space character, this function writes a space character to the stream; otherwise, no characters are written to the stream.</p>
|
|
<p><b>See also </b><a href="qdebug.html#space">space</a>() and <a href="qdebug.html#nospace">nospace</a>().</p>
|
|
<!-- @@@maybeSpace -->
|
|
<!-- $$$nospace[overload1]$$$nospace -->
|
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<h3 class="fn"><a name="nospace"></a><span class="type">QDebug</span> & QDebug::<span class="name">nospace</span> ()</h3>
|
|
<p>Clears the stream's internal flag that records whether the last character was a space and returns a reference to the stream.</p>
|
|
<p><b>See also </b><a href="qdebug.html#space">space</a>() and <a href="qdebug.html#maybeSpace">maybeSpace</a>().</p>
|
|
<!-- @@@nospace -->
|
|
<!-- $$$space[overload1]$$$space -->
|
|
<h3 class="fn"><a name="space"></a><span class="type">QDebug</span> & QDebug::<span class="name">space</span> ()</h3>
|
|
<p>Writes a space character to the debug stream and returns a reference to the stream.</p>
|
|
<p>The stream will record that the last character sent to the stream was a space.</p>
|
|
<p><b>See also </b><a href="qdebug.html#nospace">nospace</a>() and <a href="qdebug.html#maybeSpace">maybeSpace</a>().</p>
|
|
<!-- @@@space -->
|
|
<!-- $$$operator<<[overload1]$$$operator<<QChar -->
|
|
<h3 class="fn"><a name="operator-lt-lt"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type"><a href="qchar.html">QChar</a></span> <i>t</i> )</h3>
|
|
<p>Writes the character, <i>t</i>, to the stream and returns a reference to the stream.</p>
|
|
<!-- @@@operator<< -->
|
|
<!-- $$$operator<<$$$operator<<bool -->
|
|
<h3 class="fn"><a name="operator-lt-lt-3"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type">bool</span> <i>t</i> )</h3>
|
|
<p>Writes the boolean value, <i>t</i>, to the stream and returns a reference to the stream.</p>
|
|
<!-- @@@operator<< -->
|
|
<!-- $$$operator<<$$$operator<<char -->
|
|
<h3 class="fn"><a name="operator-lt-lt-4"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type">char</span> <i>t</i> )</h3>
|
|
<p>Writes the character, <i>t</i>, to the stream and returns a reference to the stream.</p>
|
|
<!-- @@@operator<< -->
|
|
<!-- $$$operator<<$$$operator<<signedshort -->
|
|
<h3 class="fn"><a name="operator-lt-lt-5"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type">signed</span> <span class="type">short</span> <i>i</i> )</h3>
|
|
<p>Writes the signed short integer, <i>i</i>, to the stream and returns a reference to the stream.</p>
|
|
<!-- @@@operator<< -->
|
|
<!-- $$$operator<<$$$operator<<unsignedshort -->
|
|
<h3 class="fn"><a name="operator-lt-lt-6"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type">unsigned</span> <span class="type">short</span> <i>i</i> )</h3>
|
|
<p>Writes then unsigned short integer, <i>i</i>, to the stream and returns a reference to the stream.</p>
|
|
<!-- @@@operator<< -->
|
|
<!-- $$$operator<<$$$operator<<signedint -->
|
|
<h3 class="fn"><a name="operator-lt-lt-7"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type">signed</span> <span class="type">int</span> <i>i</i> )</h3>
|
|
<p>Writes the signed integer, <i>i</i>, to the stream and returns a reference to the stream.</p>
|
|
<!-- @@@operator<< -->
|
|
<!-- $$$operator<<$$$operator<<unsignedint -->
|
|
<h3 class="fn"><a name="operator-lt-lt-8"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type">unsigned</span> <span class="type">int</span> <i>i</i> )</h3>
|
|
<p>Writes then unsigned integer, <i>i</i>, to the stream and returns a reference to the stream.</p>
|
|
<!-- @@@operator<< -->
|
|
<!-- $$$operator<<$$$operator<<signedlong -->
|
|
<h3 class="fn"><a name="operator-lt-lt-9"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type">signed</span> <span class="type">long</span> <i>l</i> )</h3>
|
|
<p>Writes the signed long integer, <i>l</i>, to the stream and returns a reference to the stream.</p>
|
|
<!-- @@@operator<< -->
|
|
<!-- $$$operator<<$$$operator<<unsignedlong -->
|
|
<h3 class="fn"><a name="operator-lt-lt-10"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type">unsigned</span> <span class="type">long</span> <i>l</i> )</h3>
|
|
<p>Writes then unsigned long integer, <i>l</i>, to the stream and returns a reference to the stream.</p>
|
|
<!-- @@@operator<< -->
|
|
<!-- $$$operator<<$$$operator<<qint64 -->
|
|
<h3 class="fn"><a name="operator-lt-lt-11"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> <i>i</i> )</h3>
|
|
<p>Writes the signed 64-bit integer, <i>i</i>, to the stream and returns a reference to the stream.</p>
|
|
<!-- @@@operator<< -->
|
|
<!-- $$$operator<<$$$operator<<quint64 -->
|
|
<h3 class="fn"><a name="operator-lt-lt-12"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type"><a href="qtglobal.html#quint64-typedef">quint64</a></span> <i>i</i> )</h3>
|
|
<p>Writes then unsigned 64-bit integer, <i>i</i>, to the stream and returns a reference to the stream.</p>
|
|
<!-- @@@operator<< -->
|
|
<!-- $$$operator<<$$$operator<<float -->
|
|
<h3 class="fn"><a name="operator-lt-lt-13"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type">float</span> <i>f</i> )</h3>
|
|
<p>Writes the 32-bit floating point number, <i>f</i>, to the stream and returns a reference to the stream.</p>
|
|
<!-- @@@operator<< -->
|
|
<!-- $$$operator<<$$$operator<<double -->
|
|
<h3 class="fn"><a name="operator-lt-lt-14"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( <span class="type">double</span> <i>f</i> )</h3>
|
|
<p>Writes the 64-bit floating point number, <i>f</i>, to the stream and returns a reference to the stream.</p>
|
|
<!-- @@@operator<< -->
|
|
<!-- $$$operator<<$$$operator<<constchar* -->
|
|
<h3 class="fn"><a name="operator-lt-lt-15"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( const <span class="type">char</span> * <i>s</i> )</h3>
|
|
<p>Writes the '\0'-terminated string, <i>s</i>, to the stream and returns a reference to the stream.</p>
|
|
<!-- @@@operator<< -->
|
|
<!-- $$$operator<<$$$operator<<constQString& -->
|
|
<h3 class="fn"><a name="operator-lt-lt-16"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( const <span class="type"><a href="qstring.html">QString</a></span> & <i>s</i> )</h3>
|
|
<p>Writes the string, <i>s</i>, to the stream and returns a reference to the stream.</p>
|
|
<!-- @@@operator<< -->
|
|
<!-- $$$operator<<$$$operator<<constQStringRef& -->
|
|
<h3 class="fn"><a name="operator-lt-lt-17"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( const <span class="type"><a href="qstringref.html">QStringRef</a></span> & <i>s</i> )</h3>
|
|
<p>Writes the string reference, <i>s</i>, to the stream and returns a reference to the stream.</p>
|
|
<!-- @@@operator<< -->
|
|
<!-- $$$operator<<$$$operator<<constQLatin1String& -->
|
|
<h3 class="fn"><a name="operator-lt-lt-18"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( const <span class="type"><a href="qlatin1string.html">QLatin1String</a></span> & <i>s</i> )</h3>
|
|
<p>Writes the Latin1-encoded string, <i>s</i>, to the stream and returns a reference to the stream.</p>
|
|
<!-- @@@operator<< -->
|
|
<!-- $$$operator<<$$$operator<<constQByteArray& -->
|
|
<h3 class="fn"><a name="operator-lt-lt-19"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( const <span class="type"><a href="qbytearray.html">QByteArray</a></span> & <i>b</i> )</h3>
|
|
<p>Writes the byte array, <i>b</i>, to the stream and returns a reference to the stream.</p>
|
|
<!-- @@@operator<< -->
|
|
<!-- $$$operator<<$$$operator<<constvoid* -->
|
|
<h3 class="fn"><a name="operator-lt-lt-20"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator<<</span> ( const <span class="type">void</span> * <i>p</i> )</h3>
|
|
<p>Writes a pointer, <i>p</i>, to the stream and returns a reference to the stream.</p>
|
|
<!-- @@@operator<< -->
|
|
<!-- $$$operator=[overload1]$$$operator=constQDebug& -->
|
|
<h3 class="fn"><a name="operator-eq"></a><span class="type">QDebug</span> & QDebug::<span class="name">operator=</span> ( const <span class="type">QDebug</span> & <i>other</i> )</h3>
|
|
<p>Assigns the <i>other</i> debug stream to this stream and returns a reference to this stream.</p>
|
|
<!-- @@@operator= -->
|
|
</div>
|
|
</div>
|
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</div>
|
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|
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<span></span>
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<p>
|
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<acronym title="Copyright">©</acronym> 2015 The Qt Company Ltd.
|
|
Documentation contributions included herein are the copyrights of
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their respective owners.</p>
|
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<br />
|
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<p>
|
|
The documentation provided herein is licensed under the terms of the
|
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<a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation
|
|
License version 1.3</a> as published by the Free Software Foundation.</p>
|
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<p>
|
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Documentation sources may be obtained from <a href="http://www.qt-project.org">
|
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www.qt-project.org</a>.</p>
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<br />
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<p>
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Qt and respective logos are trademarks of The Qt Company Ltd
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in Finland and/or other countries worldwide. All other trademarks are property
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of their respective owners. <a title="Privacy Policy"
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href="http://en.gitorious.org/privacy_policy/">Privacy Policy</a></p>
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