<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Quarks</title><meta name="generator" content="DocBook XSL Stylesheets V1.65.1"><link rel="home" href="index.html" title="GLib Reference Manual"><link rel="up" href="glib-data-types.html" title="GLib Data Types"><link rel="previous" href="glib-N-ary-Trees.html" title="N-ary Trees"><link rel="next" href="glib-Keyed-Data-Lists.html" title="Keyed Data Lists"><link rel="chapter" href="glib.html" title="GLib Overview"><link rel="refentry" href="glib-building.html" title="Compiling the GLib package"><link rel="refentry" href="glib-cross-compiling.html" title="Cross-compiling the GLib package"><link rel="refentry" href="glib-compiling.html" title="Compiling GLib Applications"><link rel="refentry" href="glib-running.html" title="Running GLib Applications"><link rel="refentry" href="glib-changes.html" title="Changes to GLib"><link rel="refentry" href="glib-resources.html" title="Mailing lists and bug 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href="glib-Quarks.html#id3324817" title="Description"><link rel="section" href="glib-Quarks.html#id3324929" title="Details"><meta name="generator" content="GTK-Doc V1.2 (XML mode)"><link rel="stylesheet" href="style.css" type="text/css"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><table class="navigation" width="100%" summary="Navigation header" cellpadding="2" cellspacing="2"><tr valign="middle"><td><a accesskey="p" href="glib-N-ary-Trees.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td><td><a accesskey="u" href="glib-data-types.html"><img src="up.png" width="24" height="24" border="0" alt="Up"></a></td><td><a accesskey="h" href="index.html"><img src="home.png" width="24" height="24" border="0" alt="Home"></a></td><th width="100%" align="center">GLib Reference Manual</th><td><a accesskey="n" href="glib-Keyed-Data-Lists.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td></tr></table><div class="refentry" lang="en"><a name="glib-Quarks"></a><div class="titlepage"><div></div><div></div></div><div class="refnamediv"><h2><span class="refentrytitle">Quarks</span></h2><p>Quarks — a 2-way association between a string and a unique integer identifier.</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis"> #include <glib.h> typedef <a href="glib-Quarks.html#GQuark">GQuark</a>; <a href="glib-Quarks.html#GQuark">GQuark</a> <a href="glib-Quarks.html#g-quark-from-string">g_quark_from_string</a> (const <a href="glib-Basic-Types.html#gchar">gchar</a> *string); <a href="glib-Quarks.html#GQuark">GQuark</a> <a href="glib-Quarks.html#g-quark-from-static-string">g_quark_from_static_string</a> (const <a href="glib-Basic-Types.html#gchar">gchar</a> *string); G_CONST_RETURN <a href="glib-Basic-Types.html#gchar">gchar</a>* <a href="glib-Quarks.html#g-quark-to-string">g_quark_to_string</a> (<a href="glib-Quarks.html#GQuark">GQuark</a> quark); <a href="glib-Quarks.html#GQuark">GQuark</a> <a href="glib-Quarks.html#g-quark-try-string">g_quark_try_string</a> (const <a href="glib-Basic-Types.html#gchar">gchar</a> *string); </pre></div><div class="refsect1" lang="en"><a name="id3324817"></a><h2>Description</h2><p> Quarks are associations between strings and integer identifiers. Given either the string or the <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> identifier it is possible to retrieve the other. </p><p> Quarks are used for both Datasets and Keyed Data Lists. </p><p> To create a new quark from a string, use <a href="glib-Quarks.html#g-quark-from-string"><tt class="function">g_quark_from_string()</tt></a> or <a href="glib-Quarks.html#g-quark-from-static-string"><tt class="function">g_quark_from_static_string()</tt></a>. </p><p> To find the string corresponding to a given <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a>, use <a href="glib-Quarks.html#g-quark-to-string"><tt class="function">g_quark_to_string()</tt></a>. </p><p> To find the <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> corresponding to a given string, use <a href="glib-Quarks.html#g-quark-try-string"><tt class="function">g_quark_try_string()</tt></a>. </p></div><div class="refsect1" lang="en"><a name="id3324929"></a><h2>Details</h2><div class="refsect2" lang="en"><a name="id3324935"></a><h3><a name="GQuark"></a>GQuark</h3><a class="indexterm" name="id3324945"></a><pre class="programlisting">typedef guint32 GQuark; </pre><p> A GQuark is an integer which uniquely identifies a particular string. </p></div><hr><div class="refsect2" lang="en"><a name="id3324961"></a><h3><a name="g-quark-from-string"></a>g_quark_from_string ()</h3><a class="indexterm" name="id3324972"></a><pre class="programlisting"><a href="glib-Quarks.html#GQuark">GQuark</a> g_quark_from_string (const <a href="glib-Basic-Types.html#gchar">gchar</a> *string);</pre><p> Gets the <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> identifying the given string. If the string does not currently have an associated <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a>, a new <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> is created, using a copy of the string. </p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>string</tt></i> :</span></td><td>a string. </td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td>the <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> identifying the string. </td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3325063"></a><h3><a name="g-quark-from-static-string"></a>g_quark_from_static_string ()</h3><a class="indexterm" name="id3325074"></a><pre class="programlisting"><a href="glib-Quarks.html#GQuark">GQuark</a> g_quark_from_static_string (const <a href="glib-Basic-Types.html#gchar">gchar</a> *string);</pre><p> Gets the <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> identifying the given (static) string. If the string does not currently have an associated <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a>, a new <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> is created, linked to the given string. </p><p> Note that this function is identical to <a href="glib-Quarks.html#g-quark-from-string"><tt class="function">g_quark_from_string()</tt></a> except that if a new <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> is created the string itself is used rather than a copy. This saves memory, but can only be used if the string will always exist (if, for example, it is a statically-allocated string). </p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>string</tt></i> :</span></td><td>a string. </td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td>the <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> identifying the string. </td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3325191"></a><h3><a name="g-quark-to-string"></a>g_quark_to_string ()</h3><a class="indexterm" name="id3325202"></a><pre class="programlisting">G_CONST_RETURN <a href="glib-Basic-Types.html#gchar">gchar</a>* g_quark_to_string (<a href="glib-Quarks.html#GQuark">GQuark</a> quark);</pre><p> Gets the string associated with the given <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a>. </p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>quark</tt></i> :</span></td><td>a <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a>. </td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td>the string associated with the <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a>. </td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3325284"></a><h3><a name="g-quark-try-string"></a>g_quark_try_string ()</h3><a class="indexterm" name="id3325295"></a><pre class="programlisting"><a href="glib-Quarks.html#GQuark">GQuark</a> g_quark_try_string (const <a href="glib-Basic-Types.html#gchar">gchar</a> *string);</pre><p> Gets the <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> associated with the given string, or 0 if the string has no associated <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a>. </p><p> If you want the GQuark to be created if it doesn't already exist, use <a href="glib-Quarks.html#g-quark-from-string"><tt class="function">g_quark_from_string()</tt></a> or <a href="glib-Quarks.html#g-quark-from-static-string"><tt class="function">g_quark_from_static_string()</tt></a>. </p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>string</tt></i> :</span></td><td>a string. </td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td>the <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> associated with the string, or 0 if there is no <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> associated with the string. </td></tr></tbody></table></div></div></div></div><table class="navigation" width="100%" summary="Navigation footer" cellpadding="2" cellspacing="0"><tr valign="middle"><td align="left"><a accesskey="p" href="glib-N-ary-Trees.html"><b><< N-ary Trees</b></a></td><td align="right"><a accesskey="n" href="glib-Keyed-Data-Lists.html"><b>Keyed Data Lists >></b></a></td></tr></table></body></html>