*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
/*
* Modified by the GLib Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GLib Team. See the ChangeLog
* files for a list of changes. These files are distributed with
- * GLib at ftp://ftp.gtk.org/pub/gtk/.
+ * GLib at ftp://ftp.gtk.org/pub/gtk/.
*/
-/*
+/*
* MT safe
*/
#include "config.h"
-#include "glib.h"
-#include "galias.h"
+#include "glist.h"
+#include "gslice.h"
+#include "gmessages.h"
+
+#include "gtestutils.h"
+
+/**
+ * SECTION:linked_lists_double
+ * @title: Doubly-Linked Lists
+ * @short_description: linked lists that can be iterated over in both directions
+ *
+ * The #GList structure and its associated functions provide a standard
+ * doubly-linked list data structure.
+ *
+ * Each element in the list contains a piece of data, together with
+ * pointers which link to the previous and next elements in the list.
+ * Using these pointers it is possible to move through the list in both
+ * directions (unlike the singly-linked [GSList][glib-Singly-Linked-Lists],
+ * which only allows movement through the list in the forward direction).
+ *
+ * The double linked list does not keep track of the number of items
+ * and does not keep track of both the start and end of the list. If
+ * you want fast access to both the start and the end of the list,
+ * and/or the number of items in the list, use a
+ * [GQueue][glib-Double-ended-Queues] instead.
+ *
+ * The data contained in each element can be either integer values, by
+ * using one of the [Type Conversion Macros][glib-Type-Conversion-Macros],
+ * or simply pointers to any type of data.
+ *
+ * List elements are allocated from the [slice allocator][glib-Memory-Slices],
+ * which is more efficient than allocating elements individually.
+ *
+ * Note that most of the #GList functions expect to be passed a pointer
+ * to the first element in the list. The functions which insert
+ * elements return the new start of the list, which may have changed.
+ *
+ * There is no function to create a #GList. %NULL is considered to be
+ * a valid, empty list so you simply set a #GList* to %NULL to initialize
+ * it.
+ *
+ * To add elements, use g_list_append(), g_list_prepend(),
+ * g_list_insert() and g_list_insert_sorted().
+ *
+ * To visit all elements in the list, use a loop over the list:
+ * |[<!-- language="C" -->
+ * GList *l;
+ * for (l = list; l != NULL; l = l->next)
+ * {
+ * // do something with l->data
+ * }
+ * ]|
+ *
+ * To call a function for each element in the list, use g_list_foreach().
+ *
+ * To loop over the list and modify it (e.g. remove a certain element)
+ * a while loop is more appropriate, for example:
+ * |[<!-- language="C" -->
+ * GList *l = list;
+ * while (l != NULL)
+ * {
+ * GList *next = l->next;
+ * if (should_be_removed (l))
+ * {
+ * // possibly free l->data
+ * list = g_list_delete_link (list, l);
+ * }
+ * l = next;
+ * }
+ * ]|
+ *
+ * To remove elements, use g_list_remove().
+ *
+ * To navigate in a list, use g_list_first(), g_list_last(),
+ * g_list_next(), g_list_previous().
+ *
+ * To find elements in the list use g_list_nth(), g_list_nth_data(),
+ * g_list_find() and g_list_find_custom().
+ *
+ * To find the index of an element use g_list_position() and
+ * g_list_index().
+ *
+ * To free the entire list, use g_list_free() or g_list_free_full().
+ */
+
+/**
+ * GList:
+ * @data: holds the element's data, which can be a pointer to any kind
+ * of data, or any integer value using the
+ * [Type Conversion Macros][glib-Type-Conversion-Macros]
+ * @next: contains the link to the next element in the list
+ * @prev: contains the link to the previous element in the list
+ *
+ * The #GList struct is used for each element in a doubly-linked list.
+ **/
+/**
+ * g_list_previous:
+ * @list: an element in a #GList
+ *
+ * A convenience macro to get the previous element in a #GList.
+ * Note that it is considered perfectly acceptable to access
+ * @list->previous directly.
+ *
+ * Returns: the previous element, or %NULL if there are no previous
+ * elements
+ **/
-void g_list_push_allocator (gpointer dummy) { /* present for binary compat only */ }
-void g_list_pop_allocator (void) { /* present for binary compat only */ }
+/**
+ * g_list_next:
+ * @list: an element in a #GList
+ *
+ * A convenience macro to get the next element in a #GList.
+ * Note that it is considered perfectly acceptable to access
+ * @list->next directly.
+ *
+ * Returns: the next element, or %NULL if there are no more elements
+ **/
#define _g_list_alloc() g_slice_new (GList)
#define _g_list_alloc0() g_slice_new0 (GList)
#define _g_list_free1(list) g_slice_free (GList, list)
-GList*
+/**
+ * g_list_alloc:
+ *
+ * Allocates space for one #GList element. It is called by
+ * g_list_append(), g_list_prepend(), g_list_insert() and
+ * g_list_insert_sorted() and so is rarely used on its own.
+ *
+ * Returns: a pointer to the newly-allocated #GList element
+ **/
+GList *
g_list_alloc (void)
{
return _g_list_alloc0 ();
* Frees all of the memory used by a #GList.
* The freed elements are returned to the slice allocator.
*
- * <note><para>
- * If list elements contain dynamically-allocated memory,
- * they should be freed first.
- * </para></note>
+ * If list elements contain dynamically-allocated memory, you should
+ * either use g_list_free_full() or free them manually first.
*/
void
g_list_free (GList *list)
* Frees one #GList element.
* It is usually used after g_list_remove_link().
*/
+/**
+ * g_list_free1:
+ *
+ * Another name for g_list_free_1().
+ **/
void
g_list_free_1 (GList *list)
{
}
/**
+ * g_list_free_full:
+ * @list: a pointer to a #GList
+ * @free_func: the function to be called to free each element's data
+ *
+ * Convenience method, which frees all the memory used by a #GList,
+ * and calls @free_func on every element's data.
+ *
+ * Since: 2.28
+ */
+void
+g_list_free_full (GList *list,
+ GDestroyNotify free_func)
+{
+ g_list_foreach (list, (GFunc) free_func, NULL);
+ g_list_free (list);
+}
+
+/**
* g_list_append:
* @list: a pointer to a #GList
* @data: the data for the new element
*
* Adds a new element on to the end of the list.
*
- * <note><para>
- * The return value is the new start of the list, which
- * may have changed, so make sure you store the new value.
- * </para></note>
- *
- * <note><para>
- * Note that g_list_append() has to traverse the entire list
- * to find the end, which is inefficient when adding multiple
- * elements. A common idiom to avoid the inefficiency is to prepend
- * the elements and reverse the list when all elements have been added.
- * </para></note>
- *
- * |[
- * /* Notice that these are initialized to the empty list. */
- * GList *list = NULL, *number_list = NULL;
- *
- * /* This is a list of strings. */
- * list = g_list_append (list, "first");
- * list = g_list_append (list, "second");
+ * Note that the return value is the new start of the list,
+ * if @list was empty; make sure you store the new value.
+ *
+ * g_list_append() has to traverse the entire list to find the end,
+ * which is inefficient when adding multiple elements. A common idiom
+ * to avoid the inefficiency is to use g_list_prepend() and reverse
+ * the list with g_list_reverse() when all elements have been added.
+ *
+ * |[<!-- language="C" -->
+ * // Notice that these are initialized to the empty list.
+ * GList *string_list = NULL, *number_list = NULL;
+ *
+ * // This is a list of strings.
+ * string_list = g_list_append (string_list, "first");
+ * string_list = g_list_append (string_list, "second");
*
- * /* This is a list of integers. */
+ * // This is a list of integers.
* number_list = g_list_append (number_list, GINT_TO_POINTER (27));
* number_list = g_list_append (number_list, GINT_TO_POINTER (14));
* ]|
*
- * Returns: the new start of the #GList
+ * Returns: either @list or the new start of the #GList if @list was %NULL
*/
-GList*
-g_list_append (GList *list,
- gpointer data)
+GList *
+g_list_append (GList *list,
+ gpointer data)
{
GList *new_list;
GList *last;
/**
* g_list_prepend:
- * @list: a pointer to a #GList
+ * @list: a pointer to a #GList, this must point to the top of the list
* @data: the data for the new element
*
- * Adds a new element on to the start of the list.
+ * Prepends a new element on to the start of the list.
*
- * <note><para>
- * The return value is the new start of the list, which
- * may have changed, so make sure you store the new value.
- * </para></note>
+ * Note that the return value is the new start of the list,
+ * which will have changed, so make sure you store the new value.
*
- * |[
- * /* Notice that it is initialized to the empty list. */
+ * |[<!-- language="C" -->
+ * // Notice that it is initialized to the empty list.
* GList *list = NULL;
+ *
* list = g_list_prepend (list, "last");
* list = g_list_prepend (list, "first");
* ]|
*
- * Returns: the new start of the #GList
+ * Do not use this function to prepend a new element to a different
+ * element than the start of the list. Use g_list_insert_before() instead.
+ *
+ * Returns: a pointer to the newly prepended element, which is the new
+ * start of the #GList
*/
-GList*
-g_list_prepend (GList *list,
- gpointer data)
+GList *
+g_list_prepend (GList *list,
+ gpointer data)
{
GList *new_list;
{
new_list->prev = list->prev;
if (list->prev)
- list->prev->next = new_list;
+ list->prev->next = new_list;
list->prev = new_list;
}
else
/**
* g_list_insert:
- * @list: a pointer to a #GList
+ * @list: a pointer to a #GList, this must point to the top of the list
* @data: the data for the new element
* @position: the position to insert the element. If this is
* negative, or is larger than the number of elements in the
*
* Inserts a new element into the list at the given position.
*
- * Returns: the new start of the #GList
+ * Returns: the (possibly changed) start of the #GList
*/
-GList*
-g_list_insert (GList *list,
- gpointer data,
- gint position)
+GList *
+g_list_insert (GList *list,
+ gpointer data,
+ gint position)
{
GList *new_list;
GList *tmp_list;
-
+
if (position < 0)
return g_list_append (list, data);
else if (position == 0)
return g_list_prepend (list, data);
-
+
tmp_list = g_list_nth (list, position);
if (!tmp_list)
return g_list_append (list, data);
-
+
new_list = _g_list_alloc ();
new_list->data = data;
new_list->prev = tmp_list->prev;
- if (tmp_list->prev)
- tmp_list->prev->next = new_list;
+ tmp_list->prev->next = new_list;
new_list->next = tmp_list;
tmp_list->prev = new_list;
-
- if (tmp_list == list)
- return new_list;
- else
- return list;
+
+ return list;
}
/**
* g_list_insert_before:
- * @list: a pointer to a #GList
+ * @list: a pointer to a #GList, this must point to the top of the list
* @sibling: the list element before which the new element
* is inserted or %NULL to insert at the end of the list
* @data: the data for the new element
*
* Inserts a new element into the list before the given position.
*
- * Returns: the new start of the #GList
+ * Returns: the (possibly changed) start of the #GList
*/
-GList*
-g_list_insert_before (GList *list,
- GList *sibling,
- gpointer data)
+GList *
+g_list_insert_before (GList *list,
+ GList *sibling,
+ gpointer data)
{
if (!list)
{
node->next = sibling;
sibling->prev = node;
if (node->prev)
- {
- node->prev->next = node;
- return list;
- }
+ {
+ node->prev->next = node;
+ return list;
+ }
else
- {
- g_return_val_if_fail (sibling == list, node);
- return node;
- }
+ {
+ g_return_val_if_fail (sibling == list, node);
+ return node;
+ }
}
else
{
last = list;
while (last->next)
- last = last->next;
+ last = last->next;
last->next = _g_list_alloc ();
last->next->data = data;
/**
* g_list_concat:
- * @list1: a #GList
- * @list2: the #GList to add to the end of the first #GList
+ * @list1: a #GList, this must point to the top of the list
+ * @list2: the #GList to add to the end of the first #GList,
+ * this must point to the top of the list
*
* Adds the second #GList onto the end of the first #GList.
* Note that the elements of the second #GList are not copied.
* They are used directly.
*
- * Returns: the start of the new #GList
+ * This function is for example used to move an element in the list.
+ * The following example moves an element to the top of the list:
+ * |[<!-- language="C" -->
+ * list = g_list_remove_link (list, llink);
+ * list = g_list_concat (llink, list);
+ * ]|
+ *
+ * Returns: the start of the new #GList, which equals @list1 if not %NULL
*/
GList *
-g_list_concat (GList *list1, GList *list2)
+g_list_concat (GList *list1,
+ GList *list2)
{
GList *tmp_list;
{
tmp_list = g_list_last (list1);
if (tmp_list)
- tmp_list->next = list2;
+ tmp_list->next = list2;
else
- list1 = list2;
+ list1 = list2;
list2->prev = tmp_list;
}
return list1;
}
+static inline GList *
+_g_list_remove_link (GList *list,
+ GList *link)
+{
+ if (link == NULL)
+ return list;
+
+ if (link->prev)
+ {
+ if (link->prev->next == link)
+ link->prev->next = link->next;
+ else
+ g_warning ("corrupted double-linked list detected");
+ }
+ if (link->next)
+ {
+ if (link->next->prev == link)
+ link->next->prev = link->prev;
+ else
+ g_warning ("corrupted double-linked list detected");
+ }
+
+ if (link == list)
+ list = list->next;
+
+ link->next = NULL;
+ link->prev = NULL;
+
+ return list;
+}
+
/**
* g_list_remove:
- * @list: a #GList
+ * @list: a #GList, this must point to the top of the list
* @data: the data of the element to remove
*
* Removes an element from a #GList.
* If two elements contain the same data, only the first is removed.
* If none of the elements contain the data, the #GList is unchanged.
*
- * Returns: the new start of the #GList
+ * Returns: the (possibly changed) start of the #GList
*/
-GList*
-g_list_remove (GList *list,
- gconstpointer data)
+GList *
+g_list_remove (GList *list,
+ gconstpointer data)
{
GList *tmp;
-
+
tmp = list;
while (tmp)
{
if (tmp->data != data)
- tmp = tmp->next;
+ tmp = tmp->next;
else
- {
- if (tmp->prev)
- tmp->prev->next = tmp->next;
- if (tmp->next)
- tmp->next->prev = tmp->prev;
-
- if (list == tmp)
- list = list->next;
-
- _g_list_free1 (tmp);
-
- break;
- }
+ {
+ list = _g_list_remove_link (list, tmp);
+ _g_list_free1 (tmp);
+
+ break;
+ }
}
return list;
}
/**
* g_list_remove_all:
- * @list: a #GList
+ * @list: a #GList, this must point to the top of the list
* @data: data to remove
*
- * Removes all list nodes with data equal to @data.
- * Returns the new head of the list. Contrast with
- * g_list_remove() which removes only the first node
+ * Removes all list nodes with data equal to @data.
+ * Returns the new head of the list. Contrast with
+ * g_list_remove() which removes only the first node
* matching the given data.
*
- * Returns: new head of @list
+ * Returns: the (possibly changed) start of the #GList
*/
-GList*
-g_list_remove_all (GList *list,
- gconstpointer data)
+GList *
+g_list_remove_all (GList *list,
+ gconstpointer data)
{
GList *tmp = list;
while (tmp)
{
if (tmp->data != data)
- tmp = tmp->next;
+ tmp = tmp->next;
else
- {
- GList *next = tmp->next;
-
- if (tmp->prev)
- tmp->prev->next = next;
- else
- list = next;
- if (next)
- next->prev = tmp->prev;
-
- _g_list_free1 (tmp);
- tmp = next;
- }
- }
- return list;
-}
+ {
+ GList *next = tmp->next;
-static inline GList*
-_g_list_remove_link (GList *list,
- GList *link)
-{
- if (link)
- {
- if (link->prev)
- link->prev->next = link->next;
- if (link->next)
- link->next->prev = link->prev;
-
- if (link == list)
- list = list->next;
-
- link->next = NULL;
- link->prev = NULL;
+ if (tmp->prev)
+ tmp->prev->next = next;
+ else
+ list = next;
+ if (next)
+ next->prev = tmp->prev;
+
+ _g_list_free1 (tmp);
+ tmp = next;
+ }
}
-
return list;
}
/**
* g_list_remove_link:
- * @list: a #GList
+ * @list: a #GList, this must point to the top of the list
* @llink: an element in the #GList
*
* Removes an element from a #GList, without freeing the element.
* The removed element's prev and next links are set to %NULL, so
* that it becomes a self-contained list with one element.
*
- * Returns: the new start of the #GList, without the element
+ * This function is for example used to move an element in the list
+ * (see the example for g_list_concat()) or to remove an element in
+ * the list before freeing its data:
+ * |[<!-- language="C" -->
+ * list = g_list_remove_link (list, llink);
+ * free_some_data_that_may_access_the_list_again (llink->data);
+ * g_list_free (llink);
+ * ]|
+ *
+ * Returns: the (possibly changed) start of the #GList
*/
-GList*
+GList *
g_list_remove_link (GList *list,
- GList *llink)
+ GList *llink)
{
return _g_list_remove_link (list, llink);
}
/**
* g_list_delete_link:
- * @list: a #GList
+ * @list: a #GList, this must point to the top of the list
* @link_: node to delete from @list
*
* Removes the node link_ from the list and frees it.
* Compare this to g_list_remove_link() which removes the node
* without freeing it.
*
- * Returns: the new head of @list
+ * Returns: the (possibly changed) start of the #GList
*/
-GList*
+GList *
g_list_delete_link (GList *list,
- GList *link_)
+ GList *link_)
{
list = _g_list_remove_link (list, link_);
_g_list_free1 (link_);
/**
* g_list_copy:
- * @list: a #GList
+ * @list: a #GList, this must point to the top of the list
*
* Copies a #GList.
*
- * <note><para>
* Note that this is a "shallow" copy. If the list elements
* consist of pointers to data, the pointers are copied but
- * the actual data is not.
- * </para></note>
+ * the actual data is not. See g_list_copy_deep() if you need
+ * to copy the data as well.
*
- * Returns: a copy of @list
+ * Returns: the start of the new list that holds the same data as @list
*/
-GList*
+GList *
g_list_copy (GList *list)
{
+ return g_list_copy_deep (list, NULL, NULL);
+}
+
+/**
+ * g_list_copy_deep:
+ * @list: a #GList, this must point to the top of the list
+ * @func: a copy function used to copy every element in the list
+ * @user_data: user data passed to the copy function @func, or %NULL
+ *
+ * Makes a full (deep) copy of a #GList.
+ *
+ * In contrast with g_list_copy(), this function uses @func to make
+ * a copy of each list element, in addition to copying the list
+ * container itself.
+ *
+ * @func, as a #GCopyFunc, takes two arguments, the data to be copied
+ * and a @user_data pointer. It's safe to pass %NULL as user_data,
+ * if the copy function takes only one argument.
+ *
+ * For instance, if @list holds a list of GObjects, you can do:
+ * |[<!-- language="C" -->
+ * another_list = g_list_copy_deep (list, (GCopyFunc) g_object_ref, NULL);
+ * ]|
+ *
+ * And, to entirely free the new list, you could do:
+ * |[<!-- language="C" -->
+ * g_list_free_full (another_list, g_object_unref);
+ * ]|
+ *
+ * Returns: the start of the new list that holds a full copy of @list,
+ * use g_list_free_full() to free it
+ *
+ * Since: 2.34
+ */
+GList *
+g_list_copy_deep (GList *list,
+ GCopyFunc func,
+ gpointer user_data)
+{
GList *new_list = NULL;
if (list)
GList *last;
new_list = _g_list_alloc ();
- new_list->data = list->data;
+ if (func)
+ new_list->data = func (list->data, user_data);
+ else
+ new_list->data = list->data;
new_list->prev = NULL;
last = new_list;
list = list->next;
while (list)
- {
- last->next = _g_list_alloc ();
- last->next->prev = last;
- last = last->next;
- last->data = list->data;
- list = list->next;
- }
+ {
+ last->next = _g_list_alloc ();
+ last->next->prev = last;
+ last = last->next;
+ if (func)
+ last->data = func (list->data, user_data);
+ else
+ last->data = list->data;
+ list = list->next;
+ }
last->next = NULL;
}
/**
* g_list_reverse:
- * @list: a #GList
+ * @list: a #GList, this must point to the top of the list
*
* Reverses a #GList.
* It simply switches the next and prev pointers of each element.
*
* Returns: the start of the reversed #GList
*/
-GList*
+GList *
g_list_reverse (GList *list)
{
GList *last;
/**
* g_list_nth:
- * @list: a #GList
+ * @list: a #GList, this must point to the top of the list
* @n: the position of the element, counting from 0
*
* Gets the element at the given position in a #GList.
* Returns: the element, or %NULL if the position is off
* the end of the #GList
*/
-GList*
+GList *
g_list_nth (GList *list,
- guint n)
+ guint n)
{
while ((n-- > 0) && list)
list = list->next;
* Returns: the element, or %NULL if the position is
* off the end of the #GList
*/
-GList*
+GList *
g_list_nth_prev (GList *list,
- guint n)
+ guint n)
{
while ((n-- > 0) && list)
list = list->prev;
/**
* g_list_nth_data:
- * @list: a #GList
+ * @list: a #GList, this must point to the top of the list
* @n: the position of the element
*
* Gets the data of the element at the given position.
* is off the end of the #GList
*/
gpointer
-g_list_nth_data (GList *list,
- guint n)
+g_list_nth_data (GList *list,
+ guint n)
{
while ((n-- > 0) && list)
list = list->next;
/**
* g_list_find:
- * @list: a #GList
+ * @list: a #GList, this must point to the top of the list
* @data: the element data to find
*
- * Finds the element in a #GList which
- * contains the given data.
+ * Finds the element in a #GList which contains the given data.
*
- * Returns: the found #GList element,
- * or %NULL if it is not found
+ * Returns: the found #GList element, or %NULL if it is not found
*/
-GList*
+GList *
g_list_find (GList *list,
- gconstpointer data)
+ gconstpointer data)
{
while (list)
{
if (list->data == data)
- break;
+ break;
list = list->next;
}
/**
* g_list_find_custom:
- * @list: a #GList
+ * @list: a #GList, this must point to the top of the list
* @data: user data passed to the function
* @func: the function to call for each element.
* It should return 0 when the desired element is found
*
* Returns: the found #GList element, or %NULL if it is not found
*/
-GList*
+GList *
g_list_find_custom (GList *list,
- gconstpointer data,
- GCompareFunc func)
+ gconstpointer data,
+ GCompareFunc func)
{
g_return_val_if_fail (func != NULL, list);
while (list)
{
if (! func (list->data, data))
- return list;
+ return list;
list = list->next;
}
return NULL;
}
-
/**
* g_list_position:
- * @list: a #GList
+ * @list: a #GList, this must point to the top of the list
* @llink: an element in the #GList
*
* Gets the position of the given element
*/
gint
g_list_position (GList *list,
- GList *llink)
+ GList *llink)
{
gint i;
while (list)
{
if (list == llink)
- return i;
+ return i;
i++;
list = list->next;
}
/**
* g_list_index:
- * @list: a #GList
+ * @list: a #GList, this must point to the top of the list
* @data: the data to find
*
* Gets the position of the element containing
*/
gint
g_list_index (GList *list,
- gconstpointer data)
+ gconstpointer data)
{
gint i;
while (list)
{
if (list->data == data)
- return i;
+ return i;
i++;
list = list->next;
}
/**
* g_list_last:
- * @list: a #GList
+ * @list: any #GList element
*
* Gets the last element in a #GList.
*
- * Returns: the last element in the #GList,
+ * Returns: the last element in the #GList,
* or %NULL if the #GList has no elements
*/
-GList*
+GList *
g_list_last (GList *list)
{
if (list)
{
while (list->next)
- list = list->next;
+ list = list->next;
}
return list;
/**
* g_list_first:
- * @list: a #GList
+ * @list: any #GList element
*
* Gets the first element in a #GList.
*
* Returns: the first element in the #GList,
* or %NULL if the #GList has no elements
*/
-GList*
+GList *
g_list_first (GList *list)
{
if (list)
{
while (list->prev)
- list = list->prev;
+ list = list->prev;
}
return list;
/**
* g_list_length:
- * @list: a #GList
+ * @list: a #GList, this must point to the top of the list
*
* Gets the number of elements in a #GList.
*
- * <note><para>
- * This function iterates over the whole list to
- * count its elements.
- * </para></note>
+ * This function iterates over the whole list to count its elements.
+ * Use a #GQueue instead of a GList if you regularly need the number
+ * of items.
*
* Returns: the number of elements in the #GList
*/
/**
* g_list_foreach:
- * @list: a #GList
+ * @list: a #GList, this must point to the top of the list
* @func: the function to call with each element's data
* @user_data: user data to pass to the function
*
* Calls a function for each element of a #GList.
*/
+/**
+ * GFunc:
+ * @data: the element's data
+ * @user_data: user data passed to g_list_foreach() or g_slist_foreach()
+ *
+ * Specifies the type of functions passed to g_list_foreach() and
+ * g_slist_foreach().
+ */
void
-g_list_foreach (GList *list,
- GFunc func,
- gpointer user_data)
+g_list_foreach (GList *list,
+ GFunc func,
+ gpointer user_data)
{
while (list)
{
static GList*
g_list_insert_sorted_real (GList *list,
- gpointer data,
- GFunc func,
- gpointer user_data)
+ gpointer data,
+ GFunc func,
+ gpointer user_data)
{
GList *tmp_list = list;
GList *new_list;
/**
* g_list_insert_sorted:
- * @list: a pointer to a #GList
+ * @list: a pointer to a #GList, this must point to the top of the
+ * already sorted list
* @data: the data for the new element
* @func: the function to compare elements in the list. It should
* return a number > 0 if the first parameter comes after the
* Inserts a new element into the list, using the given comparison
* function to determine its position.
*
- * Returns: the new start of the #GList
+ * If you are adding many new elements to a list, and the number of
+ * new elements is much larger than the length of the list, use
+ * g_list_prepend() to add the new items and sort the list afterwards
+ * with g_list_sort().
+ *
+ * Returns: the (possibly changed) start of the #GList
*/
-GList*
+GList *
g_list_insert_sorted (GList *list,
- gpointer data,
- GCompareFunc func)
+ gpointer data,
+ GCompareFunc func)
{
return g_list_insert_sorted_real (list, data, (GFunc) func, NULL);
}
/**
* g_list_insert_sorted_with_data:
- * @list: a pointer to a #GList
+ * @list: a pointer to a #GList, this must point to the top of the
+ * already sorted list
* @data: the data for the new element
- * @func: the function to compare elements in the list.
- * It should return a number > 0 if the first parameter
- * comes after the second parameter in the sort order.
- * @user_data: user data to pass to comparison function.
+ * @func: the function to compare elements in the list. It should
+ * return a number > 0 if the first parameter comes after the
+ * second parameter in the sort order.
+ * @user_data: user data to pass to comparison function
*
* Inserts a new element into the list, using the given comparison
* function to determine its position.
*
- * Returns: the new start of the #GList
+ * If you are adding many new elements to a list, and the number of
+ * new elements is much larger than the length of the list, use
+ * g_list_prepend() to add the new items and sort the list afterwards
+ * with g_list_sort().
+ *
+ * Returns: the (possibly changed) start of the #GList
*
* Since: 2.10
*/
-GList*
+GList *
g_list_insert_sorted_with_data (GList *list,
- gpointer data,
- GCompareDataFunc func,
- gpointer user_data)
+ gpointer data,
+ GCompareDataFunc func,
+ gpointer user_data)
{
return g_list_insert_sorted_real (list, data, (GFunc) func, user_data);
}
static GList *
g_list_sort_merge (GList *l1,
- GList *l2,
- GFunc compare_func,
- gpointer user_data)
+ GList *l2,
+ GFunc compare_func,
+ gpointer user_data)
{
GList list, *l, *lprev;
gint cmp;
if (cmp <= 0)
{
- l->next = l1;
- l1 = l1->next;
+ l->next = l1;
+ l1 = l1->next;
}
else
- {
- l->next = l2;
- l2 = l2->next;
+ {
+ l->next = l2;
+ l2 = l2->next;
}
l = l->next;
l->prev = lprev;
return list.next;
}
-static GList*
+static GList *
g_list_sort_real (GList *list,
- GFunc compare_func,
- gpointer user_data)
+ GFunc compare_func,
+ gpointer user_data)
{
GList *l1, *l2;
while ((l2 = l2->next) != NULL)
{
if ((l2 = l2->next) == NULL)
- break;
+ break;
l1 = l1->next;
}
l2 = l1->next;
l1->next = NULL;
return g_list_sort_merge (g_list_sort_real (list, compare_func, user_data),
- g_list_sort_real (l2, compare_func, user_data),
- compare_func,
- user_data);
+ g_list_sort_real (l2, compare_func, user_data),
+ compare_func,
+ user_data);
}
/**
* g_list_sort:
- * @list: a #GList
+ * @list: a #GList, this must point to the top of the list
* @compare_func: the comparison function used to sort the #GList.
* This function is passed the data from 2 elements of the #GList
* and should return 0 if they are equal, a negative value if the
* first element comes before the second, or a positive value if
* the first element comes after the second.
*
- * Sorts a #GList using the given comparison function.
+ * Sorts a #GList using the given comparison function. The algorithm
+ * used is a stable sort.
+ *
+ * Returns: the (possibly changed) start of the #GList
+ */
+/**
+ * GCompareFunc:
+ * @a: a value
+ * @b: a value to compare with
+ *
+ * Specifies the type of a comparison function used to compare two
+ * values. The function should return a negative integer if the first
+ * value comes before the second, 0 if they are equal, or a positive
+ * integer if the first value comes after the second.
*
- * Returns: the start of the sorted #GList
+ * Returns: negative value if @a < @b; zero if @a = @b; positive
+ * value if @a > @b
*/
GList *
g_list_sort (GList *list,
- GCompareFunc compare_func)
+ GCompareFunc compare_func)
{
return g_list_sort_real (list, (GFunc) compare_func, NULL);
-
}
/**
* g_list_sort_with_data:
- * @list: a #GList
+ * @list: a #GList, this must point to the top of the list
* @compare_func: comparison function
* @user_data: user data to pass to comparison function
*
* Like g_list_sort(), but the comparison function accepts
* a user data argument.
*
- * Returns: the new head of @list
+ * Returns: the (possibly changed) start of the #GList
+ */
+/**
+ * GCompareDataFunc:
+ * @a: a value
+ * @b: a value to compare with
+ * @user_data: user data
+ *
+ * Specifies the type of a comparison function used to compare two
+ * values. The function should return a negative integer if the first
+ * value comes before the second, 0 if they are equal, or a positive
+ * integer if the first value comes after the second.
+ *
+ * Returns: negative value if @a < @b; zero if @a = @b; positive
+ * value if @a > @b
*/
GList *
g_list_sort_with_data (GList *list,
- GCompareDataFunc compare_func,
- gpointer user_data)
+ GCompareDataFunc compare_func,
+ gpointer user_data)
{
return g_list_sort_real (list, (GFunc) compare_func, user_data);
}
-
-#define __G_LIST_C__
-#include "galiasdef.c"
projects / platform / upstream / glib.git / blobdiff