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This function provides an O(1) check to determine if a sequence is empty. Compare this to the two following alternatives to perform the same check. O(h): if (0 == g_sequence_get_length (seq)) O(2h): if (g_sequence_get_begin_iter(seq) == g_sequence_get_end_iter(seq)) Where `h' is the height of the tree. https://bugzilla.gnome.org/show_bug.cgi?id=756316
174 lines
8.6 KiB
C
174 lines
8.6 KiB
C
/* GLIB - Library of useful routines for C programming
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* Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007
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* Soeren Sandmann (sandmann@daimi.au.dk)
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __G_SEQUENCE_H__
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#define __G_SEQUENCE_H__
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#if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
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#error "Only <glib.h> can be included directly."
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#endif
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#include <glib/gtypes.h>
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G_BEGIN_DECLS
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typedef struct _GSequence GSequence;
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typedef struct _GSequenceNode GSequenceIter;
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typedef gint (* GSequenceIterCompareFunc) (GSequenceIter *a,
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GSequenceIter *b,
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gpointer data);
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/* GSequence */
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GLIB_AVAILABLE_IN_ALL
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GSequence * g_sequence_new (GDestroyNotify data_destroy);
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GLIB_AVAILABLE_IN_ALL
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void g_sequence_free (GSequence *seq);
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GLIB_AVAILABLE_IN_ALL
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gint g_sequence_get_length (GSequence *seq);
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GLIB_AVAILABLE_IN_ALL
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void g_sequence_foreach (GSequence *seq,
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GFunc func,
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gpointer user_data);
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GLIB_AVAILABLE_IN_ALL
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void g_sequence_foreach_range (GSequenceIter *begin,
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GSequenceIter *end,
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GFunc func,
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gpointer user_data);
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GLIB_AVAILABLE_IN_ALL
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void g_sequence_sort (GSequence *seq,
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GCompareDataFunc cmp_func,
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gpointer cmp_data);
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GLIB_AVAILABLE_IN_ALL
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void g_sequence_sort_iter (GSequence *seq,
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GSequenceIterCompareFunc cmp_func,
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gpointer cmp_data);
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GLIB_AVAILABLE_IN_2_48
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gboolean g_sequence_is_empty (GSequence *seq);
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/* Getting iters */
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GLIB_AVAILABLE_IN_ALL
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GSequenceIter *g_sequence_get_begin_iter (GSequence *seq);
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GLIB_AVAILABLE_IN_ALL
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GSequenceIter *g_sequence_get_end_iter (GSequence *seq);
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GLIB_AVAILABLE_IN_ALL
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GSequenceIter *g_sequence_get_iter_at_pos (GSequence *seq,
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gint pos);
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GLIB_AVAILABLE_IN_ALL
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GSequenceIter *g_sequence_append (GSequence *seq,
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gpointer data);
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GLIB_AVAILABLE_IN_ALL
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GSequenceIter *g_sequence_prepend (GSequence *seq,
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gpointer data);
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GLIB_AVAILABLE_IN_ALL
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GSequenceIter *g_sequence_insert_before (GSequenceIter *iter,
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gpointer data);
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GLIB_AVAILABLE_IN_ALL
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void g_sequence_move (GSequenceIter *src,
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GSequenceIter *dest);
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GLIB_AVAILABLE_IN_ALL
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void g_sequence_swap (GSequenceIter *a,
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GSequenceIter *b);
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GLIB_AVAILABLE_IN_ALL
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GSequenceIter *g_sequence_insert_sorted (GSequence *seq,
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gpointer data,
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GCompareDataFunc cmp_func,
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gpointer cmp_data);
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GLIB_AVAILABLE_IN_ALL
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GSequenceIter *g_sequence_insert_sorted_iter (GSequence *seq,
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gpointer data,
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GSequenceIterCompareFunc iter_cmp,
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gpointer cmp_data);
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GLIB_AVAILABLE_IN_ALL
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void g_sequence_sort_changed (GSequenceIter *iter,
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GCompareDataFunc cmp_func,
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gpointer cmp_data);
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GLIB_AVAILABLE_IN_ALL
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void g_sequence_sort_changed_iter (GSequenceIter *iter,
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GSequenceIterCompareFunc iter_cmp,
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gpointer cmp_data);
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GLIB_AVAILABLE_IN_ALL
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void g_sequence_remove (GSequenceIter *iter);
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GLIB_AVAILABLE_IN_ALL
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void g_sequence_remove_range (GSequenceIter *begin,
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GSequenceIter *end);
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GLIB_AVAILABLE_IN_ALL
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void g_sequence_move_range (GSequenceIter *dest,
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GSequenceIter *begin,
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GSequenceIter *end);
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GLIB_AVAILABLE_IN_ALL
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GSequenceIter *g_sequence_search (GSequence *seq,
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gpointer data,
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GCompareDataFunc cmp_func,
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gpointer cmp_data);
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GLIB_AVAILABLE_IN_ALL
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GSequenceIter *g_sequence_search_iter (GSequence *seq,
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gpointer data,
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GSequenceIterCompareFunc iter_cmp,
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gpointer cmp_data);
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GLIB_AVAILABLE_IN_ALL
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GSequenceIter *g_sequence_lookup (GSequence *seq,
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gpointer data,
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GCompareDataFunc cmp_func,
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gpointer cmp_data);
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GLIB_AVAILABLE_IN_ALL
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GSequenceIter *g_sequence_lookup_iter (GSequence *seq,
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gpointer data,
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GSequenceIterCompareFunc iter_cmp,
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gpointer cmp_data);
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/* Dereferencing */
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GLIB_AVAILABLE_IN_ALL
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gpointer g_sequence_get (GSequenceIter *iter);
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GLIB_AVAILABLE_IN_ALL
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void g_sequence_set (GSequenceIter *iter,
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gpointer data);
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/* Operations on GSequenceIter * */
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GLIB_AVAILABLE_IN_ALL
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gboolean g_sequence_iter_is_begin (GSequenceIter *iter);
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GLIB_AVAILABLE_IN_ALL
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gboolean g_sequence_iter_is_end (GSequenceIter *iter);
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GLIB_AVAILABLE_IN_ALL
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GSequenceIter *g_sequence_iter_next (GSequenceIter *iter);
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GLIB_AVAILABLE_IN_ALL
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GSequenceIter *g_sequence_iter_prev (GSequenceIter *iter);
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GLIB_AVAILABLE_IN_ALL
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gint g_sequence_iter_get_position (GSequenceIter *iter);
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GLIB_AVAILABLE_IN_ALL
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GSequenceIter *g_sequence_iter_move (GSequenceIter *iter,
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gint delta);
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GLIB_AVAILABLE_IN_ALL
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GSequence * g_sequence_iter_get_sequence (GSequenceIter *iter);
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/* Search */
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GLIB_AVAILABLE_IN_ALL
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gint g_sequence_iter_compare (GSequenceIter *a,
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GSequenceIter *b);
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GLIB_AVAILABLE_IN_ALL
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GSequenceIter *g_sequence_range_get_midpoint (GSequenceIter *begin,
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GSequenceIter *end);
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G_END_DECLS
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#endif /* __G_SEQUENCE_H__ */
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