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Breadcrumbs go here --> <li><a href="modules.html">Modules</a></li> <li><a href="qtcore.html">QtCore</a></li> <li>QLatin1String</li> </ul> </div> <div class="toolbuttons toolblock"> <ul> <li id="smallA" class="t_button">A</li> <li id="medA" class="t_button active">A</li> <li id="bigA" class="t_button">A</li> <li id="print" class="t_button"><a href="javascript:this.print();"> <span>Print</span></a></li> </ul> </div> </div> <div class="content mainContent"> <div class="toc"> <h3><a name="toc">Contents</a></h3> <ul> <li class="level1"><a href="#public-functions">Public Functions</a></li> <li class="level1"><a href="#details">Detailed Description</a></li> </ul> </div> <h1 class="title">QLatin1String Class Reference</h1> <!-- $$$QLatin1String-brief --> <p>The QLatin1String class provides a thin wrapper around an US-ASCII/Latin-1 encoded string literal. <a href="#details">More...</a></p> <!-- @@@QLatin1String --> <pre class="cpp"> <span class="preprocessor">#include <QLatin1String></span></pre><p><b>Note:</b> All functions in this class are <a href="threads-reentrancy.html#reentrant">reentrant</a>.</p> <ul> <li><a href="qlatin1string-members.html">List of all members, including inherited members</a></li> </ul> <a name="public-functions"></a> <h2>Public Functions</h2> <table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qlatin1string.html#QLatin1String">QLatin1String</a></b> ( const char * <i>str</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> const char * </td><td class="memItemRight bottomAlign"><b><a href="qlatin1string.html#latin1">latin1</a></b> () const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qlatin1string.html#operator-not-eq">operator!=</a></b> ( const QString & <i>other</i> ) const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qlatin1string.html#operator-not-eq-2">operator!=</a></b> ( const char * <i>other</i> ) const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qlatin1string.html#operator-lt">operator<</a></b> ( const QString & <i>other</i> ) const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qlatin1string.html#operator-lt-2">operator<</a></b> ( const char * <i>other</i> ) const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qlatin1string.html#operator-lt-eq">operator<=</a></b> ( const QString & <i>other</i> ) const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qlatin1string.html#operator-lt-eq-2">operator<=</a></b> ( const char * <i>other</i> ) const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QLatin1String & </td><td class="memItemRight bottomAlign"><b><a href="qlatin1string.html#operator-eq">operator=</a></b> ( const QLatin1String & <i>other</i> )</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qlatin1string.html#operator-eq-eq">operator==</a></b> ( const QString & <i>other</i> ) const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qlatin1string.html#operator-eq-eq-2">operator==</a></b> ( const char * <i>other</i> ) const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qlatin1string.html#operator-gt">operator></a></b> ( const QString & <i>other</i> ) const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qlatin1string.html#operator-gt-2">operator></a></b> ( const char * <i>other</i> ) const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qlatin1string.html#operator-gt-eq">operator>=</a></b> ( const QString & <i>other</i> ) const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> bool </td><td class="memItemRight bottomAlign"><b><a href="qlatin1string.html#operator-gt-eq-2">operator>=</a></b> ( const char * <i>other</i> ) const</td></tr> </table> <a name="details"></a> <!-- $$$QLatin1String-description --> <div class="descr"> <h2>Detailed Description</h2> <p>The QLatin1String class provides a thin wrapper around an US-ASCII/Latin-1 encoded string literal.</p> <p>Many of <a href="qstring.html">QString</a>'s member functions are overloaded to accept <tt>const char *</tt> instead of <a href="qstring.html">QString</a>. This includes the copy constructor, the assignment operator, the comparison operators, and various other functions such as <a href="qstring.html#insert">insert()</a>, <a href="qstring.html#replace">replace()</a>, and <a href="qstring.html#indexOf">indexOf()</a>. These functions are usually optimized to avoid constructing a <a href="qstring.html">QString</a> object for the <tt>const char *</tt> data. For example, assuming <tt>str</tt> is a <a href="qstring.html">QString</a>,</p> <pre class="cpp"> <span class="keyword">if</span> (str <span class="operator">=</span><span class="operator">=</span> <span class="string">"auto"</span> <span class="operator">|</span><span class="operator">|</span> str <span class="operator">=</span><span class="operator">=</span> <span class="string">"extern"</span> <span class="operator">|</span><span class="operator">|</span> str <span class="operator">=</span><span class="operator">=</span> <span class="string">"static"</span> <span class="operator">|</span><span class="operator">|</span> str <span class="operator">=</span><span class="operator">=</span> <span class="string">"register"</span>) { <span class="operator">.</span><span class="operator">.</span><span class="operator">.</span> }</pre> <p>is much faster than</p> <pre class="cpp"> <span class="keyword">if</span> (str <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"auto"</span>) <span class="operator">|</span><span class="operator">|</span> str <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"extern"</span>) <span class="operator">|</span><span class="operator">|</span> str <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"static"</span>) <span class="operator">|</span><span class="operator">|</span> str <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"register"</span>)) { <span class="operator">.</span><span class="operator">.</span><span class="operator">.</span> }</pre> <p>because it doesn't construct four temporary <a href="qstring.html">QString</a> objects and make a deep copy of the character data.</p> <p>Applications that define <tt>QT_NO_CAST_FROM_ASCII</tt> (as explained in the <a href="qstring.html">QString</a> documentation) don't have access to <a href="qstring.html">QString</a>'s <tt>const char *</tt> API. To provide an efficient way of specifying constant Latin-1 strings, Qt provides the QLatin1String, which is just a very thin wrapper around a <tt>const char *</tt>. Using QLatin1String, the example code above becomes</p> <pre class="cpp"> <span class="keyword">if</span> (str <span class="operator">=</span><span class="operator">=</span> QLatin1String(<span class="string">"auto"</span>) <span class="operator">|</span><span class="operator">|</span> str <span class="operator">=</span><span class="operator">=</span> QLatin1String(<span class="string">"extern"</span>) <span class="operator">|</span><span class="operator">|</span> str <span class="operator">=</span><span class="operator">=</span> QLatin1String(<span class="string">"static"</span>) <span class="operator">|</span><span class="operator">|</span> str <span class="operator">=</span><span class="operator">=</span> QLatin1String(<span class="string">"register"</span>) { <span class="operator">.</span><span class="operator">.</span><span class="operator">.</span> }</pre> <p>This is a bit longer to type, but it provides exactly the same benefits as the first version of the code, and is faster than converting the Latin-1 strings using <a href="qstring.html#fromLatin1">QString::fromLatin1</a>().</p> <p>Thanks to the <a href="qstring.html">QString</a>(const QLatin1String &) constructor, QLatin1String can be used everywhere a <a href="qstring.html">QString</a> is expected. For example:</p> <pre class="cpp"> <span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>label <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(QLatin1String(<span class="string">"MOD"</span>)<span class="operator">,</span> <span class="keyword">this</span>);</pre> </div> <p><b>See also </b><a href="qstring.html">QString</a> and <a href="qlatin1char.html">QLatin1Char</a>.</p> <!-- @@@QLatin1String --> <div class="func"> <h2>Member Function Documentation</h2> <!-- $$$QLatin1String[overload1]$$$QLatin1Stringconstchar* --> <h3 class="fn"><a name="QLatin1String"></a>QLatin1String::<span class="name">QLatin1String</span> ( const <span class="type">char</span> * <i>str</i> )</h3> <p>Constructs a <a href="qlatin1string.html">QLatin1String</a> object that stores <i>str</i>. Note that if <i>str</i> is 0, an empty string is created; this case is handled by <a href="qstring.html">QString</a>.</p> <p>The string data is <i>not</i> copied. The caller must be able to guarantee that <i>str</i> will not be deleted or modified as long as the <a href="qlatin1string.html">QLatin1String</a> object exists.</p> <p><b>See also </b><a href="qlatin1string.html#latin1">latin1</a>().</p> <!-- @@@QLatin1String --> <!-- $$$latin1[overload1]$$$latin1 --> <h3 class="fn"><a name="latin1"></a>const <span class="type">char</span> * QLatin1String::<span class="name">latin1</span> () const</h3> <p>Returns the Latin-1 string stored in this object.</p> <!-- @@@latin1 --> <!-- $$$operator!=[overload1]$$$operator!=constQString& --> <h3 class="fn"><a name="operator-not-eq"></a><span class="type">bool</span> QLatin1String::<span class="name">operator!=</span> ( const <span class="type"><a href="qstring.html">QString</a></span> & <i>other</i> ) const</h3> <p>Returns true if this string is not equal to string <i>other</i>; otherwise returns false.</p> <p>The comparison is based exclusively on the numeric Unicode values of the characters and is very fast, but is not what a human would expect. Consider sorting user-interface strings with <a href="qstring.html#localeAwareCompare">QString::localeAwareCompare</a>().</p> <!-- @@@operator!= --> <!-- $$$operator!=$$$operator!=constchar* --> <h3 class="fn"><a name="operator-not-eq-2"></a><span class="type">bool</span> QLatin1String::<span class="name">operator!=</span> ( const <span class="type">char</span> * <i>other</i> ) const</h3> <p>This function overloads <a href="qlatin1string.html#operator-not-eq">operator!=</a>().</p> <p>The <i>other</i> const char pointer is converted to a <a href="qstring.html">QString</a> using the <a href="qstring.html#fromAscii">QString::fromAscii</a>() function.</p> <p>You can disable this operator by defining <tt>QT_NO_CAST_FROM_ASCII</tt> when you compile your applications. This can be useful if you want to ensure that all user-visible strings go through <a href="qobject.html#tr">QObject::tr</a>(), for example.</p> <p>This function was introduced in Qt 4.3.</p> <!-- @@@operator!= --> <!-- $$$operator<[overload1]$$$operator<constQString& --> <h3 class="fn"><a name="operator-lt"></a><span class="type">bool</span> QLatin1String::<span class="name">operator<</span> ( const <span class="type"><a href="qstring.html">QString</a></span> & <i>other</i> ) const</h3> <p>Returns true if this string is lexically less than the <i>other</i> string; otherwise returns false.</p> <p>The comparison is based exclusively on the numeric Unicode values of the characters and is very fast, but is not what a human would expect. Consider sorting user-interface strings using the <a href="qstring.html#localeAwareCompare">QString::localeAwareCompare</a>() function.</p> <!-- @@@operator< --> <!-- $$$operator<$$$operator<constchar* --> <h3 class="fn"><a name="operator-lt-2"></a><span class="type">bool</span> QLatin1String::<span class="name">operator<</span> ( const <span class="type">char</span> * <i>other</i> ) const</h3> <p>This is an overloaded function.</p> <p>The <i>other</i> const char pointer is converted to a <a href="qstring.html">QString</a> using the <a href="qstring.html#fromAscii">QString::fromAscii</a>() function.</p> <p>You can disable this operator by defining <tt>QT_NO_CAST_FROM_ASCII</tt> when you compile your applications. This can be useful if you want to ensure that all user-visible strings go through <a href="qobject.html#tr">QObject::tr</a>(), for example.</p> <p>This function was introduced in Qt 4.3.</p> <!-- @@@operator< --> <!-- $$$operator<=[overload1]$$$operator<=constQString& --> <h3 class="fn"><a name="operator-lt-eq"></a><span class="type">bool</span> QLatin1String::<span class="name">operator<=</span> ( const <span class="type"><a href="qstring.html">QString</a></span> & <i>other</i> ) const</h3> <p>Returns true if this string is lexically less than or equal to string <i>other</i>; otherwise returns false.</p> <p>The comparison is based exclusively on the numeric Unicode values of the characters and is very fast, but is not what a human would expect. Consider sorting user-interface strings with <a href="qstring.html#localeAwareCompare">QString::localeAwareCompare</a>().</p> <!-- @@@operator<= --> <!-- $$$operator<=$$$operator<=constchar* --> <h3 class="fn"><a name="operator-lt-eq-2"></a><span class="type">bool</span> QLatin1String::<span class="name">operator<=</span> ( const <span class="type">char</span> * <i>other</i> ) const</h3> <p>This is an overloaded function.</p> <p>The <i>other</i> const char pointer is converted to a <a href="qstring.html">QString</a> using the <a href="qstring.html#fromAscii">QString::fromAscii</a>() function.</p> <p>You can disable this operator by defining <tt>QT_NO_CAST_FROM_ASCII</tt> when you compile your applications. This can be useful if you want to ensure that all user-visible strings go through <a href="qobject.html#tr">QObject::tr</a>(), for example.</p> <p>This function was introduced in Qt 4.3.</p> <!-- @@@operator<= --> <!-- $$$operator=[overload1]$$$operator=constQLatin1String& --> <h3 class="fn"><a name="operator-eq"></a><span class="type">QLatin1String</span> & QLatin1String::<span class="name">operator=</span> ( const <span class="type">QLatin1String</span> & <i>other</i> )</h3> <p>Constructs a copy of <i>other</i>.</p> <p>This function was introduced in Qt 4.1.</p> <!-- @@@operator= --> <!-- $$$operator==[overload1]$$$operator==constQString& --> <h3 class="fn"><a name="operator-eq-eq"></a><span class="type">bool</span> QLatin1String::<span class="name">operator==</span> ( const <span class="type"><a href="qstring.html">QString</a></span> & <i>other</i> ) const</h3> <p>Returns true if this string is equal to string <i>other</i>; otherwise returns false.</p> <p>The comparison is based exclusively on the numeric Unicode values of the characters and is very fast, but is not what a human would expect. Consider sorting user-interface strings with <a href="qstring.html#localeAwareCompare">QString::localeAwareCompare</a>().</p> <!-- @@@operator== --> <!-- $$$operator==$$$operator==constchar* --> <h3 class="fn"><a name="operator-eq-eq-2"></a><span class="type">bool</span> QLatin1String::<span class="name">operator==</span> ( const <span class="type">char</span> * <i>other</i> ) const</h3> <p>This is an overloaded function.</p> <p>The <i>other</i> const char pointer is converted to a <a href="qstring.html">QString</a> using the <a href="qstring.html#fromAscii">QString::fromAscii</a>() function.</p> <p>You can disable this operator by defining <tt>QT_NO_CAST_FROM_ASCII</tt> when you compile your applications. This can be useful if you want to ensure that all user-visible strings go through <a href="qobject.html#tr">QObject::tr</a>(), for example.</p> <p>This function was introduced in Qt 4.3.</p> <!-- @@@operator== --> <!-- $$$operator>[overload1]$$$operator>constQString& --> <h3 class="fn"><a name="operator-gt"></a><span class="type">bool</span> QLatin1String::<span class="name">operator></span> ( const <span class="type"><a href="qstring.html">QString</a></span> & <i>other</i> ) const</h3> <p>Returns true if this string is lexically greater than string <i>other</i>; otherwise returns false.</p> <p>The comparison is based exclusively on the numeric Unicode values of the characters and is very fast, but is not what a human would expect. Consider sorting user-interface strings with <a href="qstring.html#localeAwareCompare">QString::localeAwareCompare</a>().</p> <!-- @@@operator> --> <!-- $$$operator>$$$operator>constchar* --> <h3 class="fn"><a name="operator-gt-2"></a><span class="type">bool</span> QLatin1String::<span class="name">operator></span> ( const <span class="type">char</span> * <i>other</i> ) const</h3> <p>This is an overloaded function.</p> <p>The <i>other</i> const char pointer is converted to a <a href="qstring.html">QString</a> using the <a href="qstring.html#fromAscii">QString::fromAscii</a>() function.</p> <p>You can disable this operator by defining <tt>QT_NO_CAST_FROM_ASCII</tt> when you compile your applications. This can be useful if you want to ensure that all user-visible strings go through <a href="qobject.html#tr">QObject::tr</a>(), for example.</p> <p>This function was introduced in Qt 4.3.</p> <!-- @@@operator> --> <!-- $$$operator>=[overload1]$$$operator>=constQString& --> <h3 class="fn"><a name="operator-gt-eq"></a><span class="type">bool</span> QLatin1String::<span class="name">operator>=</span> ( const <span class="type"><a href="qstring.html">QString</a></span> & <i>other</i> ) const</h3> <p>Returns true if this string is lexically greater than or equal to string <i>other</i>; otherwise returns false.</p> <p>The comparison is based exclusively on the numeric Unicode values of the characters and is very fast, but is not what a human would expect. Consider sorting user-interface strings with <a href="qstring.html#localeAwareCompare">QString::localeAwareCompare</a>().</p> <!-- @@@operator>= --> <!-- $$$operator>=$$$operator>=constchar* --> <h3 class="fn"><a name="operator-gt-eq-2"></a><span class="type">bool</span> QLatin1String::<span class="name">operator>=</span> ( const <span class="type">char</span> * <i>other</i> ) const</h3> <p>This is an overloaded function.</p> <p>The <i>other</i> const char pointer is converted to a <a href="qstring.html">QString</a> using the <a href="qstring.html#fromAscii">QString::fromAscii</a>() function.</p> <p>You can disable this operator by defining <tt>QT_NO_CAST_FROM_ASCII</tt> when you compile your applications. This can be useful if you want to ensure that all user-visible strings go through <a href="qobject.html#tr">QObject::tr</a>(), for example.</p> <p>This function was introduced in Qt 4.3.</p> <!-- @@@operator>= --> </div> </div> </div> </div> <div class="ft"> <span></span> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2015 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.</p> <br /> <p> The documentation provided herein is licensed under the terms of the <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> <p> Documentation sources may be obtained from <a href="http://www.qt-project.org"> www.qt-project.org</a>.</p> <br /> <p> Qt and respective logos are trademarks of The Qt Company Ltd in Finland and/or other countries worldwide. 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