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<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Datasets</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-Keyed-Data-Lists.html" title="Keyed Data Lists"><link rel="next" href="glib-Relations-and-Tuples.html" title="Relations and Tuples"><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 reports"><link rel="chapter" href="glib-fundamentals.html" title="GLib Fundamentals"><link rel="refentry" href="glib-Basic-Types.html" title="Basic Types"><link rel="refentry" href="glib-Limits-of-Basic-Types.html" title="Limits of Basic Types"><link rel="refentry" href="glib-Standard-Macros.html" title="Standard Macros"><link rel="refentry" href="glib-Type-Conversion-Macros.html" title="Type Conversion Macros"><link rel="refentry" href="glib-Byte-Order-Macros.html" title="Byte Order Macros"><link rel="refentry" href="glib-Numerical-Definitions.html" title="Numerical Definitions"><link rel="refentry" href="glib-Miscellaneous-Macros.html" title="Miscellaneous Macros"><link rel="refentry" href="glib-Atomic-Operations.html" title="Atomic Operations"><link rel="chapter" href="glib-core.html" title="GLib Core Application Support"><link rel="refentry" href="glib-The-Main-Event-Loop.html" title="The Main Event Loop"><link rel="refentry" href="glib-Threads.html" title="
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href="glib-Datasets.html#id3330287" title="Description"><link rel="section" href="glib-Datasets.html#id3330482" 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-Keyed-Data-Lists.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-Relations-and-Tuples.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-Datasets"></a><div class="titlepage"><div></div><div></div></div><div class="refnamediv"><h2><span class="refentrytitle">Datasets</span></h2><p>Datasets — associate groups of data elements with particular memory locations.</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">
#include <glib.h>
#define <a href="glib-Datasets.html#g-dataset-id-set-data">g_dataset_id_set_data</a> (l, k, d)
void <a href="glib-Datasets.html#g-dataset-id-set-data-full">g_dataset_id_set_data_full</a> (<a href="glib-Basic-Types.html#gconstpointer">gconstpointer</a> dataset_location,
<a href="glib-Quarks.html#GQuark">GQuark</a> key_id,
<a href="glib-Basic-Types.html#gpointer">gpointer</a> data,
<a href="glib-Datasets.html#GDestroyNotify">GDestroyNotify</a> destroy_func);
void (<a href="glib-Datasets.html#GDestroyNotify">*GDestroyNotify</a>) (<a href="glib-Basic-Types.html#gpointer">gpointer</a> data);
<a href="glib-Basic-Types.html#gpointer">gpointer</a> <a href="glib-Datasets.html#g-dataset-id-get-data">g_dataset_id_get_data</a> (<a href="glib-Basic-Types.html#gconstpointer">gconstpointer</a> dataset_location,
<a href="glib-Quarks.html#GQuark">GQuark</a> key_id);
#define <a href="glib-Datasets.html#g-dataset-id-remove-data">g_dataset_id_remove_data</a> (l, k)
<a href="glib-Basic-Types.html#gpointer">gpointer</a> <a href="glib-Datasets.html#g-dataset-id-remove-no-notify">g_dataset_id_remove_no_notify</a> (<a href="glib-Basic-Types.html#gconstpointer">gconstpointer</a> dataset_location,
<a href="glib-Quarks.html#GQuark">GQuark</a> key_id);
#define <a href="glib-Datasets.html#g-dataset-set-data">g_dataset_set_data</a> (l, k, d)
#define <a href="glib-Datasets.html#g-dataset-set-data-full">g_dataset_set_data_full</a> (l, k, d, f)
#define <a href="glib-Datasets.html#g-dataset-get-data">g_dataset_get_data</a> (l, k)
#define <a href="glib-Datasets.html#g-dataset-remove-data">g_dataset_remove_data</a> (l, k)
#define <a href="glib-Datasets.html#g-dataset-remove-no-notify">g_dataset_remove_no_notify</a> (l, k)
void <a href="glib-Datasets.html#g-dataset-foreach">g_dataset_foreach</a> (<a href="glib-Basic-Types.html#gconstpointer">gconstpointer</a> dataset_location,
<a href="glib-Datasets.html#GDataForeachFunc">GDataForeachFunc</a> func,
<a href="glib-Basic-Types.html#gpointer">gpointer</a> user_data);
void (<a href="glib-Datasets.html#GDataForeachFunc">*GDataForeachFunc</a>) (<a href="glib-Quarks.html#GQuark">GQuark</a> key_id,
<a href="glib-Basic-Types.html#gpointer">gpointer</a> data,
<a href="glib-Basic-Types.html#gpointer">gpointer</a> user_data);
void <a href="glib-Datasets.html#g-dataset-destroy">g_dataset_destroy</a> (<a href="glib-Basic-Types.html#gconstpointer">gconstpointer</a> dataset_location);
</pre></div><div class="refsect1" lang="en"><a name="id3330287"></a><h2>Description</h2><p>
Datasets associate groups of data elements with particular memory locations.
These are useful if you need to associate data with a structure returned
from an external library. Since you cannot modify the structure, you use
its location in memory as the key into a dataset, where you can associate
any number of data elements with it.
</p><p>
There are two forms of most of the dataset functions.
The first form uses strings to identify the data elements associated with
a location. The second form uses <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> identifiers, which are created
with a call to <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>.
The second form is quicker, since it does not require looking up the string
in the hash table of <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> identifiers.
</p><p>
There is no function to create a dataset. It is automatically created as
soon as you add elements to it.
</p><p>
To add data elements to a dataset use <a href="glib-Datasets.html#g-dataset-id-set-data"><tt class="function">g_dataset_id_set_data()</tt></a>,
<a href="glib-Datasets.html#g-dataset-id-set-data-full"><tt class="function">g_dataset_id_set_data_full()</tt></a>, <a href="glib-Datasets.html#g-dataset-set-data"><tt class="function">g_dataset_set_data()</tt></a>
and <a href="glib-Datasets.html#g-dataset-set-data-full"><tt class="function">g_dataset_set_data_full()</tt></a>.
</p><p>
To get data elements from a dataset use <a href="glib-Datasets.html#g-dataset-id-get-data"><tt class="function">g_dataset_id_get_data()</tt></a> and
<a href="glib-Datasets.html#g-dataset-get-data"><tt class="function">g_dataset_get_data()</tt></a>.
</p><p>
To iterate over all data elements in a dataset use <a href="glib-Datasets.html#g-dataset-foreach"><tt class="function">g_dataset_foreach()</tt></a>.
</p><p>
To remove data elements from a dataset use <a href="glib-Datasets.html#g-dataset-id-remove-data"><tt class="function">g_dataset_id_remove_data()</tt></a> and
<a href="glib-Datasets.html#g-dataset-remove-data"><tt class="function">g_dataset_remove_data()</tt></a>.
</p><p>
To destroy a dataset, use <a href="glib-Datasets.html#g-dataset-destroy"><tt class="function">g_dataset_destroy()</tt></a>.
</p></div><div class="refsect1" lang="en"><a name="id3330482"></a><h2>Details</h2><div class="refsect2" lang="en"><a name="id3330487"></a><h3><a name="g-dataset-id-set-data"></a>g_dataset_id_set_data()</h3><a class="indexterm" name="id3330498"></a><pre class="programlisting">#define g_dataset_id_set_data(l, k, d)</pre><p>
Sets the data element associated with the given <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> id.
Any previous data with the same key is removed, and its destroy function
is called.
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>l</tt></i> :</span></td><td>the location identifying the dataset.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>k</tt></i> :</span></td><td>the <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> id to identify the data element.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>d</tt></i> :</span></td><td>the data element.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3330578"></a><h3><a name="g-dataset-id-set-data-full"></a>g_dataset_id_set_data_full ()</h3><a class="indexterm" name="id3330590"></a><pre class="programlisting">void g_dataset_id_set_data_full (<a href="glib-Basic-Types.html#gconstpointer">gconstpointer</a> dataset_location,
<a href="glib-Quarks.html#GQuark">GQuark</a> key_id,
<a href="glib-Basic-Types.html#gpointer">gpointer</a> data,
<a href="glib-Datasets.html#GDestroyNotify">GDestroyNotify</a> destroy_func);</pre><p>
Sets the data element associated with the given <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> id, and also the
function to call when the data element is destroyed.
Any previous data with the same key is removed, and its
destroy function is called.
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>dataset_location</tt></i> :</span></td><td>the location identifying the dataset.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>key_id</tt></i> :</span></td><td>the <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> id to identify the data element.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>data</tt></i> :</span></td><td>the data element.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>destroy_func</tt></i> :</span></td><td>the function to call when the data element is removed. This
function will be called with the data element and can be used to free any
memory allocated for it.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3330724"></a><h3><a name="GDestroyNotify"></a>GDestroyNotify ()</h3><a class="indexterm" name="id3330735"></a><pre class="programlisting">void (*GDestroyNotify) (<a href="glib-Basic-Types.html#gpointer">gpointer</a> data);</pre><p>
Specifies the type of function which is called when a data element is
destroyed. It is passed the pointer to the data element and should free
any memory and resources allocated for it.
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>data</tt></i> :</span></td><td>the data element.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3330785"></a><h3><a name="g-dataset-id-get-data"></a>g_dataset_id_get_data ()</h3><a class="indexterm" name="id3330796"></a><pre class="programlisting"><a href="glib-Basic-Types.html#gpointer">gpointer</a> g_dataset_id_get_data (<a href="glib-Basic-Types.html#gconstpointer">gconstpointer</a> dataset_location,
<a href="glib-Quarks.html#GQuark">GQuark</a> key_id);</pre><p>
Gets the data element corresponding to a <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>dataset_location</tt></i> :</span></td><td>the location identifying the dataset.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>key_id</tt></i> :</span></td><td>the <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> id to identify the data element.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td>the data element corresponding to the <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a>, or <tt class="literal">NULL</tt> if it is
not found.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3330907"></a><h3><a name="g-dataset-id-remove-data"></a>g_dataset_id_remove_data()</h3><a class="indexterm" name="id3330919"></a><pre class="programlisting">#define g_dataset_id_remove_data(l, k)</pre><p>
Removes a data element from a dataset.
The data element's destroy function is called if it has been set.
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>l</tt></i> :</span></td><td>the location identifying the dataset.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>k</tt></i> :</span></td><td>the <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> id identifying the data element.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3330976"></a><h3><a name="g-dataset-id-remove-no-notify"></a>g_dataset_id_remove_no_notify ()</h3><a class="indexterm" name="id3330988"></a><pre class="programlisting"><a href="glib-Basic-Types.html#gpointer">gpointer</a> g_dataset_id_remove_no_notify (<a href="glib-Basic-Types.html#gconstpointer">gconstpointer</a> dataset_location,
<a href="glib-Quarks.html#GQuark">GQuark</a> key_id);</pre><p>
Removes an element, without calling its destroy notification function.
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>dataset_location</tt></i> :</span></td><td>the location identifying the dataset.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>key_id</tt></i> :</span></td><td>the <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> ID identifying the data element.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td>the data previously stored at <i class="parameter"><tt>key_id</tt></i>, or <tt class="literal">NULL</tt> if none.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3331090"></a><h3><a name="g-dataset-set-data"></a>g_dataset_set_data()</h3><a class="indexterm" name="id3331101"></a><pre class="programlisting">#define g_dataset_set_data(l, k, d)</pre><p>
Sets the data corresponding to the given string identifier.
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>l</tt></i> :</span></td><td>the location identifying the dataset.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>k</tt></i> :</span></td><td>the string to identify the data element.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>d</tt></i> :</span></td><td>the data element.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3331164"></a><h3><a name="g-dataset-set-data-full"></a>g_dataset_set_data_full()</h3><a class="indexterm" name="id3331175"></a><pre class="programlisting">#define g_dataset_set_data_full(l, k, d, f)</pre><p>
Sets the data corresponding to the given string identifier, and the function
to call when the data element is destroyed.
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>l</tt></i> :</span></td><td>the location identifying the dataset.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>k</tt></i> :</span></td><td>the string to identify the data element.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>d</tt></i> :</span></td><td>the data element.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>f</tt></i> :</span></td><td>the function to call when the data element is removed. This
function will be called with the data element and can be used to free any
memory allocated for it.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3331254"></a><h3><a name="g-dataset-get-data"></a>g_dataset_get_data()</h3><a class="indexterm" name="id3331266"></a><pre class="programlisting">#define g_dataset_get_data(l, k)</pre><p>
Gets the data element corresponding to a string.
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>l</tt></i> :</span></td><td>the location identifying the dataset.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>k</tt></i> :</span></td><td>the string identifying the data element.
</td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td>the data element corresponding to the string, or <tt class="literal">NULL</tt> if it is not
found.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3331331"></a><h3><a name="g-dataset-remove-data"></a>g_dataset_remove_data()</h3><a class="indexterm" name="id3331343"></a><pre class="programlisting">#define g_dataset_remove_data(l, k)</pre><p>
Removes a data element corresponding to a string.
Its destroy function is called if it has been set.
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>l</tt></i> :</span></td><td>the location identifying the dataset.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>k</tt></i> :</span></td><td>the string identifying the data element.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3331392"></a><h3><a name="g-dataset-remove-no-notify"></a>g_dataset_remove_no_notify()</h3><a class="indexterm" name="id3331405"></a><pre class="programlisting">#define g_dataset_remove_no_notify(l, k)</pre><p>
Removes an element, without calling its destroy notifier.
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>l</tt></i> :</span></td><td>the location identifying the dataset.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>k</tt></i> :</span></td><td>the string identifying the data element.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3331453"></a><h3><a name="g-dataset-foreach"></a>g_dataset_foreach ()</h3><a class="indexterm" name="id3331464"></a><pre class="programlisting">void g_dataset_foreach (<a href="glib-Basic-Types.html#gconstpointer">gconstpointer</a> dataset_location,
<a href="glib-Datasets.html#GDataForeachFunc">GDataForeachFunc</a> func,
<a href="glib-Basic-Types.html#gpointer">gpointer</a> user_data);</pre><p>
Calls the given function for each data element which is associated with the
given location.
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>dataset_location</tt></i> :</span></td><td>the location identifying the dataset.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>func</tt></i> :</span></td><td>the function to call for each data element.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>user_data</tt></i> :</span></td><td>user data to pass to the function.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3331558"></a><h3><a name="GDataForeachFunc"></a>GDataForeachFunc ()</h3><a class="indexterm" name="id3331568"></a><pre class="programlisting">void (*GDataForeachFunc) (<a href="glib-Quarks.html#GQuark">GQuark</a> key_id,
<a href="glib-Basic-Types.html#gpointer">gpointer</a> data,
<a href="glib-Basic-Types.html#gpointer">gpointer</a> user_data);</pre><p>
Specifies the type of function passed to <a href="glib-Datasets.html#g-dataset-foreach"><tt class="function">g_dataset_foreach()</tt></a>.
It is called with each <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> id and associated data element,
together with the <i class="parameter"><tt>user_data</tt></i> parameter supplied to <a href="glib-Datasets.html#g-dataset-foreach"><tt class="function">g_dataset_foreach()</tt></a>.
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>key_id</tt></i> :</span></td><td>the <a href="glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> id to identifying the data element.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>data</tt></i> :</span></td><td>the data element.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>user_data</tt></i> :</span></td><td>user data passed to <a href="glib-Datasets.html#g-dataset-foreach"><tt class="function">g_dataset_foreach()</tt></a>.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3331714"></a><h3><a name="g-dataset-destroy"></a>g_dataset_destroy ()</h3><a class="indexterm" name="id3331725"></a><pre class="programlisting">void g_dataset_destroy (<a href="glib-Basic-Types.html#gconstpointer">gconstpointer</a> dataset_location);</pre><p>
Destroys the dataset, freeing all memory allocated, and calling any
destroy functions set for data elements.
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>dataset_location</tt></i> :</span></td><td>the location identifying the dataset.
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