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href="glib-Caches.html#id3338110" title="Description"><link rel="section" href="glib-Caches.html#id3338209" 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-Relations-and-Tuples.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-Memory-Allocators.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-Caches"></a><div class="titlepage"><div></div><div></div></div><div class="refnamediv"><h2><span class="refentrytitle">Caches</span></h2><p>Caches — caches allow sharing of complex data structures to save resources.</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis"> #include <glib.h> struct <a href="glib-Caches.html#GCache">GCache</a>; <a href="glib-Caches.html#GCache">GCache</a>* <a href="glib-Caches.html#g-cache-new">g_cache_new</a> (<a href="glib-Caches.html#GCacheNewFunc">GCacheNewFunc</a> value_new_func, <a href="glib-Caches.html#GCacheDestroyFunc">GCacheDestroyFunc</a> value_destroy_func, <a href="glib-Caches.html#GCacheDupFunc">GCacheDupFunc</a> key_dup_func, <a href="glib-Caches.html#GCacheDestroyFunc">GCacheDestroyFunc</a> key_destroy_func, <a href="glib-Hash-Tables.html#GHashFunc">GHashFunc</a> hash_key_func, <a href="glib-Hash-Tables.html#GHashFunc">GHashFunc</a> hash_value_func, <a href="glib-Hash-Tables.html#GEqualFunc">GEqualFunc</a> key_equal_func); <a href="glib-Basic-Types.html#gpointer">gpointer</a> <a href="glib-Caches.html#g-cache-insert">g_cache_insert</a> (<a href="glib-Caches.html#GCache">GCache</a> *cache, <a href="glib-Basic-Types.html#gpointer">gpointer</a> key); void <a href="glib-Caches.html#g-cache-remove">g_cache_remove</a> (<a href="glib-Caches.html#GCache">GCache</a> *cache, <a href="glib-Basic-Types.html#gconstpointer">gconstpointer</a> value); void <a href="glib-Caches.html#g-cache-destroy">g_cache_destroy</a> (<a href="glib-Caches.html#GCache">GCache</a> *cache); void <a href="glib-Caches.html#g-cache-key-foreach">g_cache_key_foreach</a> (<a href="glib-Caches.html#GCache">GCache</a> *cache, <a href="glib-Hash-Tables.html#GHFunc">GHFunc</a> func, <a href="glib-Basic-Types.html#gpointer">gpointer</a> user_data); void <a href="glib-Caches.html#g-cache-value-foreach">g_cache_value_foreach</a> (<a href="glib-Caches.html#GCache">GCache</a> *cache, <a href="glib-Hash-Tables.html#GHFunc">GHFunc</a> func, <a href="glib-Basic-Types.html#gpointer">gpointer</a> user_data); void (<a href="glib-Caches.html#GCacheDestroyFunc">*GCacheDestroyFunc</a>) (<a href="glib-Basic-Types.html#gpointer">gpointer</a> value); <a href="glib-Basic-Types.html#gpointer">gpointer</a> (<a href="glib-Caches.html#GCacheDupFunc">*GCacheDupFunc</a>) (<a href="glib-Basic-Types.html#gpointer">gpointer</a> value); <a href="glib-Basic-Types.html#gpointer">gpointer</a> (<a href="glib-Caches.html#GCacheNewFunc">*GCacheNewFunc</a>) (<a href="glib-Basic-Types.html#gpointer">gpointer</a> key); </pre></div><div class="refsect1" lang="en"><a name="id3338110"></a><h2>Description</h2><p> A <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a> allows sharing of complex data structures, in order to save system resources. </p><p> GTK+ uses caches for <span class="type">GtkStyles</span> and <span class="type">GdkGCs</span>. These consume a lot of resources, so a <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a> is used to see if a <a href="../gtk/GtkStyle.html" ><span class="type">GtkStyle</span></a> or <a href="../gdk/gdk-Graphics-Contexts.html#GdkGC" ><span class="type">GdkGC</span></a> with the required properties already exists. If it does, then the existing object is used instead of creating a new one. </p><p> <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a> uses keys and values. A <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a> key describes the properties of a particular resource. A <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a> value is the actual resource. </p></div><div class="refsect1" lang="en"><a name="id3338209"></a><h2>Details</h2><div class="refsect2" lang="en"><a name="id3338215"></a><h3><a name="GCache"></a>struct GCache</h3><a class="indexterm" name="id3338226"></a><pre class="programlisting">struct GCache;</pre><p> The <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a> struct is an opaque data structure containing information about a <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a>. It should only be accessed via the following functions. </p></div><hr><div class="refsect2" lang="en"><a name="id3338259"></a><h3><a name="g-cache-new"></a>g_cache_new ()</h3><a class="indexterm" name="id3338269"></a><pre class="programlisting"><a href="glib-Caches.html#GCache">GCache</a>* g_cache_new (<a href="glib-Caches.html#GCacheNewFunc">GCacheNewFunc</a> value_new_func, <a href="glib-Caches.html#GCacheDestroyFunc">GCacheDestroyFunc</a> value_destroy_func, <a href="glib-Caches.html#GCacheDupFunc">GCacheDupFunc</a> key_dup_func, <a href="glib-Caches.html#GCacheDestroyFunc">GCacheDestroyFunc</a> key_destroy_func, <a href="glib-Hash-Tables.html#GHashFunc">GHashFunc</a> hash_key_func, <a href="glib-Hash-Tables.html#GHashFunc">GHashFunc</a> hash_value_func, <a href="glib-Hash-Tables.html#GEqualFunc">GEqualFunc</a> key_equal_func);</pre><p> Creates a new <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a>. </p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>value_new_func</tt></i> :</span></td><td>a function to create a new object given a key. This is called by <a href="glib-Caches.html#g-cache-insert"><tt class="function">g_cache_insert()</tt></a> if an object with the given key does not already exist. </td></tr><tr><td><span class="term"><i class="parameter"><tt>value_destroy_func</tt></i> :</span></td><td>a function to destroy an object. It is called by <a href="glib-Caches.html#g-cache-remove"><tt class="function">g_cache_remove()</tt></a> when the object is no longer needed (i.e. its reference count drops to 0). </td></tr><tr><td><span class="term"><i class="parameter"><tt>key_dup_func</tt></i> :</span></td><td>a function to copy a key. It is called by <a href="glib-Caches.html#g-cache-insert"><tt class="function">g_cache_insert()</tt></a> if the key does not already exist in the <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a>. </td></tr><tr><td><span class="term"><i class="parameter"><tt>key_destroy_func</tt></i> :</span></td><td>a function to destroy a key. It is called by <a href="glib-Caches.html#g-cache-remove"><tt class="function">g_cache_remove()</tt></a> when the object is no longer needed (i.e. its reference count drops to 0). </td></tr><tr><td><span class="term"><i class="parameter"><tt>hash_key_func</tt></i> :</span></td><td>a function to create a hash value from a key. </td></tr><tr><td><span class="term"><i class="parameter"><tt>hash_value_func</tt></i> :</span></td><td>a function to create a hash value from a value. </td></tr><tr><td><span class="term"><i class="parameter"><tt>key_equal_func</tt></i> :</span></td><td>a function to compare two keys. It should return <tt class="literal">TRUE</tt> if the two keys are equivalent. </td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td>a new <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a>. </td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3338539"></a><h3><a name="g-cache-insert"></a>g_cache_insert ()</h3><a class="indexterm" name="id3338549"></a><pre class="programlisting"><a href="glib-Basic-Types.html#gpointer">gpointer</a> g_cache_insert (<a href="glib-Caches.html#GCache">GCache</a> *cache, <a href="glib-Basic-Types.html#gpointer">gpointer</a> key);</pre><p> Gets the value corresponding to the given key, creating it if necessary. It first checks if the value already exists in the <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a>, by using the <i class="parameter"><tt>key_equal_func</tt></i> function passed to <a href="glib-Caches.html#g-cache-new"><tt class="function">g_cache_new()</tt></a>. If it does already exist it is returned, and its reference count is increased by one. If the value does not currently exist, if is created by calling the <i class="parameter"><tt>value_new_func</tt></i>. The key is duplicated by calling <i class="parameter"><tt>key_dup_func</tt></i> and the duplicated key and value are inserted into the <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a>. </p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>cache</tt></i> :</span></td><td>a <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a>. </td></tr><tr><td><span class="term"><i class="parameter"><tt>key</tt></i> :</span></td><td>a key describing a <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a> object. </td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td>a pointer to a <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a> value. </td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3338701"></a><h3><a name="g-cache-remove"></a>g_cache_remove ()</h3><a class="indexterm" name="id3338712"></a><pre class="programlisting">void g_cache_remove (<a href="glib-Caches.html#GCache">GCache</a> *cache, <a href="glib-Basic-Types.html#gconstpointer">gconstpointer</a> value);</pre><p> Decreases the reference count of the given value. If it drops to 0 then the value and its corresponding key are destroyed, using the <i class="parameter"><tt>value_destroy_func</tt></i> and <i class="parameter"><tt>key_destroy_func</tt></i> passed to <a href="glib-Caches.html#g-cache-new"><tt class="function">g_cache_new()</tt></a>. </p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>cache</tt></i> :</span></td><td>a <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a>. </td></tr><tr><td><span class="term"><i class="parameter"><tt>value</tt></i> :</span></td><td>the value to remove. </td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3338813"></a><h3><a name="g-cache-destroy"></a>g_cache_destroy ()</h3><a class="indexterm" name="id3338824"></a><pre class="programlisting">void g_cache_destroy (<a href="glib-Caches.html#GCache">GCache</a> *cache);</pre><p> Frees the memory allocated for the <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a>. </p><p> Note that it does not destroy the keys and values which were contained in the <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a>. </p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>cache</tt></i> :</span></td><td>a <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a>. </td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3338899"></a><h3><a name="g-cache-key-foreach"></a>g_cache_key_foreach ()</h3><a class="indexterm" name="id3338910"></a><pre class="programlisting">void g_cache_key_foreach (<a href="glib-Caches.html#GCache">GCache</a> *cache, <a href="glib-Hash-Tables.html#GHFunc">GHFunc</a> func, <a href="glib-Basic-Types.html#gpointer">gpointer</a> user_data);</pre><p> Calls the given function for each of the keys in the <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a>. </p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>cache</tt></i> :</span></td><td>a <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a>. </td></tr><tr><td><span class="term"><i class="parameter"><tt>func</tt></i> :</span></td><td>the function to call with each <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a> key. </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="id3339024"></a><h3><a name="g-cache-value-foreach"></a>g_cache_value_foreach ()</h3><a class="indexterm" name="id3339035"></a><pre class="programlisting">void g_cache_value_foreach (<a href="glib-Caches.html#GCache">GCache</a> *cache, <a href="glib-Hash-Tables.html#GHFunc">GHFunc</a> func, <a href="glib-Basic-Types.html#gpointer">gpointer</a> user_data);</pre><p> Calls the given function for each of the values in the <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a>. </p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>cache</tt></i> :</span></td><td>a <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a>. </td></tr><tr><td><span class="term"><i class="parameter"><tt>func</tt></i> :</span></td><td>the function to call with each <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a> value. </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="id3339150"></a><h3><a name="GCacheDestroyFunc"></a>GCacheDestroyFunc ()</h3><a class="indexterm" name="id3339161"></a><pre class="programlisting">void (*GCacheDestroyFunc) (<a href="glib-Basic-Types.html#gpointer">gpointer</a> value);</pre><p> Specifies the type of the <i class="parameter"><tt>value_destroy_func</tt></i> and <i class="parameter"><tt>key_destroy_func</tt></i> functions passed to <a href="glib-Caches.html#g-cache-new"><tt class="function">g_cache_new()</tt></a>. The functions are passed a pointer to the <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a> key or <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a> value and should free any memory and other resources associated with it. </p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>value</tt></i> :</span></td><td>the <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a> value to destroy. </td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3339256"></a><h3><a name="GCacheDupFunc"></a>GCacheDupFunc ()</h3><a class="indexterm" name="id3339267"></a><pre class="programlisting"><a href="glib-Basic-Types.html#gpointer">gpointer</a> (*GCacheDupFunc) (<a href="glib-Basic-Types.html#gpointer">gpointer</a> value);</pre><p> Specifies the type of the <i class="parameter"><tt>key_dup_func</tt></i> function passed to <a href="glib-Caches.html#g-cache-new"><tt class="function">g_cache_new()</tt></a>. The function is passed a key (<span class="emphasis"><em>not</em></span> a value as the prototype implies) and should return a duplicate of the key. </p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>value</tt></i> :</span></td><td>the <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a> key to destroy (<span class="emphasis"><em>not</em></span> a <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a> value as it seems). </td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td>a copy of the <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a> key. </td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3339373"></a><h3><a name="GCacheNewFunc"></a>GCacheNewFunc ()</h3><a class="indexterm" name="id3339384"></a><pre class="programlisting"><a href="glib-Basic-Types.html#gpointer">gpointer</a> (*GCacheNewFunc) (<a href="glib-Basic-Types.html#gpointer">gpointer</a> key);</pre><p> Specifies the type of the <i class="parameter"><tt>value_new_func</tt></i> function passed to <a href="glib-Caches.html#g-cache-new"><tt class="function">g_cache_new()</tt></a>. It is passed a <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a> key and should create the value corresponding to the key. </p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>key</tt></i> :</span></td><td>a <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a> key. </td></tr><tr><td><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td><td>a new <a href="glib-Caches.html#GCache"><span class="type">GCache</span></a> value corresponding to the key. </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-Relations-and-Tuples.html"><b><< Relations and Tuples</b></a></td><td align="right"><a accesskey="n" href="glib-Memory-Allocators.html"><b>Memory Allocators >></b></a></td></tr></table></body></html>