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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"><title>Singly-Linked Lists</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2"><link rel="start" href="index.html" title="GLib Reference Manual"><link rel="up" href="glib-data-types.html" title="GLib Data Types"><link rel="prev" href="glib-Doubly-Linked-Lists.html" title="Doubly-Linked Lists"><link rel="next" href="glib-Double-ended-Queues.html" title="Double-ended Queues"><meta name="generator" content="GTK-Doc V1.9 (XML mode)"><link rel="stylesheet" href="style.css" type="text/css"><link rel="chapter" href="glib.html" title="GLib Overview"><link rel="chapter" href="glib-fundamentals.html" title="GLib Fundamentals"><link rel="chapter" href="glib-core.html" title="GLib Core Application Support"><link rel="chapter" href="glib-utilities.html" title="GLib Utilities"><link rel="chapter" href="glib-data-types.html" title="GLib 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href="glib-Doubly-Linked-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-Double-ended-Queues.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td></tr><tr><td colspan="5" class="shortcuts"><nobr><a href="#id3249902" class="shortcut">Top</a>  |  <a href="#id3250812" class="shortcut">Description</a></nobr></td></tr></table><div class="refentry" lang="en"><a name="glib-Singly-Linked-Lists"></a><div class="titlepage"></div><div class="refnamediv"><table width="100%"><tr><td valign="top"><h2><a name="id3249902"></a><span class="refentrytitle">Singly-Linked Lists</span></h2><p>Singly-Linked Lists — linked lists containing integer values or pointers to data, limited toiterating over the list in one direction</p></td><td valign="top" align="right"></td></tr></table></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">#include <glib.h> <a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a>;<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a>* <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-alloc">g_slist_alloc</a> (void);<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a>* <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-append">g_slist_append</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list, <a class="link" href="glib-Basic-Types.html#gpointer">gpointer</a> data);<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a>* <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-prepend">g_slist_prepend</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list, <a class="link" href="glib-Basic-Types.html#gpointer">gpointer</a> data);<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a>* <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-insert">g_slist_insert</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list, <a class="link" href="glib-Basic-Types.html#gpointer">gpointer</a> data, <a class="link" href="glib-Basic-Types.html#gint">gint</a> position);<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a>* <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-insert-before">g_slist_insert_before</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *slist, <a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *sibling, <a class="link" href="glib-Basic-Types.html#gpointer">gpointer</a> data);<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a>* <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-insert-sorted">g_slist_insert_sorted</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list, <a class="link" href="glib-Basic-Types.html#gpointer">gpointer</a> data, <a class="link" href="glib-Doubly-Linked-Lists.html#GCompareFunc">GCompareFunc</a> func);<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a>* <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-remove">g_slist_remove</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list, <a class="link" href="glib-Basic-Types.html#gconstpointer">gconstpointer</a> data);<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a>* <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-remove-link">g_slist_remove_link</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list, <a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *link_);<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a>* <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-delete-link">g_slist_delete_link</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list, <a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *link_);<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a>* <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-remove-all">g_slist_remove_all</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list, <a class="link" href="glib-Basic-Types.html#gconstpointer">gconstpointer</a> data);void <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-free">g_slist_free</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list);void <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-free-1">g_slist_free_1</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list);#define <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-free1">g_slist_free1</a><a class="link" href="glib-Basic-Types.html#guint">guint</a> <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-length">g_slist_length</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list);<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a>* <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-copy">g_slist_copy</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list);<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a>* <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-reverse">g_slist_reverse</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list);<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a>* <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-insert-sorted-with-data">g_slist_insert_sorted_with_data</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list, <a class="link" href="glib-Basic-Types.html#gpointer">gpointer</a> data, <a class="link" href="glib-Doubly-Linked-Lists.html#GCompareDataFunc">GCompareDataFunc</a> func, <a class="link" href="glib-Basic-Types.html#gpointer">gpointer</a> user_data);<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a>* <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-sort">g_slist_sort</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list, <a class="link" href="glib-Doubly-Linked-Lists.html#GCompareFunc">GCompareFunc</a> compare_func);<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a>* <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-sort-with-data">g_slist_sort_with_data</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list, <a class="link" href="glib-Doubly-Linked-Lists.html#GCompareDataFunc">GCompareDataFunc</a> compare_func, <a class="link" href="glib-Basic-Types.html#gpointer">gpointer</a> user_data);<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a>* <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-concat">g_slist_concat</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list1, <a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list2);void <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-foreach">g_slist_foreach</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list, <a class="link" href="glib-Doubly-Linked-Lists.html#GFunc">GFunc</a> func, <a class="link" href="glib-Basic-Types.html#gpointer">gpointer</a> user_data);<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a>* <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-last">g_slist_last</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list);#define <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-next">g_slist_next</a> (slist)<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a>* <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-nth">g_slist_nth</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list, <a class="link" href="glib-Basic-Types.html#guint">guint</a> n);<a class="link" href="glib-Basic-Types.html#gpointer">gpointer</a> <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-nth-data">g_slist_nth_data</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list, <a class="link" href="glib-Basic-Types.html#guint">guint</a> n);<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a>* <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-find">g_slist_find</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list, <a class="link" href="glib-Basic-Types.html#gconstpointer">gconstpointer</a> data);<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a>* <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-find-custom">g_slist_find_custom</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list, <a class="link" href="glib-Basic-Types.html#gconstpointer">gconstpointer</a> data, <a class="link" href="glib-Doubly-Linked-Lists.html#GCompareFunc">GCompareFunc</a> func);<a class="link" href="glib-Basic-Types.html#gint">gint</a> <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-position">g_slist_position</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list, <a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *llink);<a class="link" href="glib-Basic-Types.html#gint">gint</a> <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-index">g_slist_index</a> (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list, <a class="link" href="glib-Basic-Types.html#gconstpointer">gconstpointer</a> data);void <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-push-allocator">g_slist_push_allocator</a> (<a class="link" href="glib-Basic-Types.html#gpointer">gpointer</a> dummy);void <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-pop-allocator">g_slist_pop_allocator</a> (void);</pre></div><div class="refsect1" lang="en"><a name="id3250812"></a><h2>Description</h2><p>The <a class="link" href="glib-Singly-Linked-Lists.html#GSList"><span class="type">GSList</span></a> structure and its associated functions provide a standardsingly-linked list data structure.</p><p>Each element in the list contains a piece of data, together with a pointerwhich links to the next element in the list.Using this pointer it is possible to move through the list in onedirection only (unlike theDoubly-Linked Listswhich allow movement in both directions).</p><p>The data contained in each element can be either integer values, by using oneof the<a class="link" href="glib-Type-Conversion-Macros.html" title="Type Conversion Macros">Type Conversion Macros</a>,or simply pointers to any type of data.</p><p>List elements are allocated from the <a class="link" href="glib-Memory-Slices.html" title="Memory Slices">sliceallocator</a>, which is more efficient than allocating elements individually.</p><p>Note that most of the <a class="link" href="glib-Singly-Linked-Lists.html#GSList"><span class="type">GSList</span></a> functions expect to be passed a pointer tothe first element in the list. The functions which insert elements returnthe new start of the list, which may have changed.</p><p>There is no function to create a <a class="link" href="glib-Singly-Linked-Lists.html#GSList"><span class="type">GSList</span></a>. <a class="link" href="glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> is considered to be the emptylist so you simply set a <a class="link" href="glib-Singly-Linked-Lists.html#GSList"><span class="type">GSList</span></a>* to <a class="link" href="glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</p><p>To add elements, use <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-append"><code class="function">g_slist_append()</code></a>, <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-prepend"><code class="function">g_slist_prepend()</code></a>, <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-insert"><code class="function">g_slist_insert()</code></a>and <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-insert-sorted"><code class="function">g_slist_insert_sorted()</code></a>.</p><p>To remove elements, use <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-remove"><code class="function">g_slist_remove()</code></a>.</p><p>To find elements in the list use <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-last"><code class="function">g_slist_last()</code></a>, <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-next"><code class="function">g_slist_next()</code></a>,<a class="link" href="glib-Singly-Linked-Lists.html#g-slist-nth"><code class="function">g_slist_nth()</code></a>, <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-nth-data"><code class="function">g_slist_nth_data()</code></a>, <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-find"><code class="function">g_slist_find()</code></a> and<a class="link" href="glib-Singly-Linked-Lists.html#g-slist-find-custom"><code class="function">g_slist_find_custom()</code></a>.</p><p>To find the index of an element use <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-position"><code class="function">g_slist_position()</code></a> and <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-index"><code class="function">g_slist_index()</code></a>.</p><p>To call a function for each element in the list use <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-foreach"><code class="function">g_slist_foreach()</code></a>.</p><p>To free the entire list, use <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-free"><code class="function">g_slist_free()</code></a>.</p></div><div class="refsect1" lang="en"><a name="id3251113"></a><h2>Details</h2><div class="refsect2" lang="en"><a name="id3251124"></a><h3><a name="GSList"></a>GSList</h3><a class="indexterm" name="id3251136"></a><pre class="programlisting">typedef struct { gpointer data; GSList *next;} GSList;</pre><p>The <a class="link" href="glib-Singly-Linked-Lists.html#GSList"><span class="type">GSList</span></a> struct is used for each element in the singly-linked list.</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><p><span class="term"><a class="link" href="glib-Basic-Types.html#gpointer">gpointer</a> <em class="structfield"><code>data</code></em>;</span></p></td><td>holds the element's data, which can be a pointer to any kind of data, or any integer value using the <a class="link" href="glib-Type-Conversion-Macros.html" title="Type Conversion Macros">Type Conversion Macros</a>.</td></tr><tr><td><p><span class="term"><a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *<em class="structfield"><code>next</code></em>;</span></p></td><td>contains the link to the next element in the list.</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3251216"></a><h3><a name="g-slist-alloc"></a>g_slist_alloc ()</h3><a class="indexterm" name="id3251229"></a><pre class="programlisting"><a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a>* g_slist_alloc (void);</pre><p>Allocates space for one <a class="link" href="glib-Singly-Linked-Lists.html#GSList"><span class="type">GSList</span></a> element.It is called by the <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-append"><code class="function">g_slist_append()</code></a>, <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-prepend"><code class="function">g_slist_prepend()</code></a>, <a class="link" href="glib-Singly-Linked-Lists.html#g-slist-insert"><code class="function">g_slist_insert()</code></a> and<a class="link" href="glib-Singly-Linked-Lists.html#g-slist-insert-sorted"><code class="function">g_slist_insert_sorted()</code></a> functions and so is rarely used on its own.</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td><td>a pointer to the newly-allocated <a class="link" href="glib-Singly-Linked-Lists.html#GSList"><span class="type">GSList</span></a> element.</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3251326"></a><h3><a name="g-slist-append"></a>g_slist_append ()</h3><a class="indexterm" name="id3251339"></a><pre class="programlisting"><a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a>* g_slist_append (<a class="link" href="glib-Singly-Linked-Lists.html#GSList">GSList</a> *list, <a class="link" href="glib-Basic-Types.html#gpointer">gpointer</a> data);</pre><p>Adds a new element on to the end of the list.</p><p></p><div class="note" style="margin-left: 0.5in; 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