1 /* GObject - GLib Type, Object, Parameter and Signal Library
2 * Copyright (C) 1997-1999, 2000-2001 Tim Janik and Red Hat, Inc.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General
15 * Public License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
17 * Boston, MA 02111-1307, USA.
27 #include "gvaluecollector.h"
33 #define G_PARAM_USER_MASK (~0 << G_PARAM_USER_SHIFT)
34 #define PSPEC_APPLIES_TO_VALUE(pspec, value) (G_TYPE_CHECK_VALUE_TYPE ((value), G_PARAM_SPEC_VALUE_TYPE (pspec)))
35 #define G_SLOCK(mutex) g_static_mutex_lock (mutex)
36 #define G_SUNLOCK(mutex) g_static_mutex_unlock (mutex)
39 /* --- prototypes --- */
40 static void g_param_spec_class_base_init (GParamSpecClass *class);
41 static void g_param_spec_class_base_finalize (GParamSpecClass *class);
42 static void g_param_spec_class_init (GParamSpecClass *class,
44 static void g_param_spec_init (GParamSpec *pspec,
45 GParamSpecClass *class);
46 static void g_param_spec_finalize (GParamSpec *pspec);
47 static void value_param_init (GValue *value);
48 static void value_param_free_value (GValue *value);
49 static void value_param_copy_value (const GValue *src_value,
51 static void value_param_transform_value (const GValue *src_value,
53 static gpointer value_param_peek_pointer (const GValue *value);
54 static gchar* value_param_collect_value (GValue *value,
55 guint n_collect_values,
56 GTypeCValue *collect_values,
58 static gchar* value_param_lcopy_value (const GValue *value,
59 guint n_collect_values,
60 GTypeCValue *collect_values,
64 /* --- variables --- */
65 static GQuark quark_floating = 0;
66 G_LOCK_DEFINE_STATIC (pspec_ref_count);
69 /* --- functions --- */
71 g_param_type_init (void) /* sync with gtype.c */
73 static const GTypeFundamentalInfo finfo = {
74 (G_TYPE_FLAG_CLASSED |
75 G_TYPE_FLAG_INSTANTIATABLE |
76 G_TYPE_FLAG_DERIVABLE |
77 G_TYPE_FLAG_DEEP_DERIVABLE),
79 static const GTypeValueTable param_value_table = {
80 value_param_init, /* value_init */
81 value_param_free_value, /* value_free */
82 value_param_copy_value, /* value_copy */
83 value_param_peek_pointer, /* value_peek_pointer */
84 "p", /* collect_format */
85 value_param_collect_value, /* collect_value */
86 "p", /* lcopy_format */
87 value_param_lcopy_value, /* lcopy_value */
89 static const GTypeInfo param_spec_info = {
90 sizeof (GParamSpecClass),
92 (GBaseInitFunc) g_param_spec_class_base_init,
93 (GBaseFinalizeFunc) g_param_spec_class_base_finalize,
94 (GClassInitFunc) g_param_spec_class_init,
95 (GClassFinalizeFunc) NULL,
96 NULL, /* class_data */
100 (GInstanceInitFunc) g_param_spec_init,
106 type = g_type_register_fundamental (G_TYPE_PARAM, "GParam", ¶m_spec_info, &finfo, G_TYPE_FLAG_ABSTRACT);
107 g_assert (type == G_TYPE_PARAM);
108 g_value_register_transform_func (G_TYPE_PARAM, G_TYPE_PARAM, value_param_transform_value);
112 g_param_spec_class_base_init (GParamSpecClass *class)
117 g_param_spec_class_base_finalize (GParamSpecClass *class)
122 g_param_spec_class_init (GParamSpecClass *class,
125 quark_floating = g_quark_from_static_string ("GParamSpec-floating");
127 class->value_type = G_TYPE_NONE;
128 class->finalize = g_param_spec_finalize;
129 class->value_set_default = NULL;
130 class->value_validate = NULL;
131 class->values_cmp = NULL;
135 g_param_spec_init (GParamSpec *pspec,
136 GParamSpecClass *class)
140 pspec->_blurb = NULL;
142 pspec->value_type = class->value_type;
143 pspec->owner_type = 0;
145 pspec->ref_count = 1;
147 g_datalist_id_set_data (&pspec->qdata, quark_floating, GUINT_TO_POINTER (TRUE));
151 g_param_spec_finalize (GParamSpec *pspec)
153 g_datalist_clear (&pspec->qdata);
155 g_free (pspec->name);
156 g_free (pspec->_nick);
157 g_free (pspec->_blurb);
159 g_type_free_instance ((GTypeInstance*) pspec);
163 g_param_spec_ref (GParamSpec *pspec)
165 g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
167 G_LOCK (pspec_ref_count);
168 if (pspec->ref_count > 0)
170 pspec->ref_count += 1;
171 G_UNLOCK (pspec_ref_count);
175 G_UNLOCK (pspec_ref_count);
176 g_return_val_if_fail (pspec->ref_count > 0, NULL);
183 g_param_spec_unref (GParamSpec *pspec)
185 g_return_if_fail (G_IS_PARAM_SPEC (pspec));
187 G_LOCK (pspec_ref_count);
188 if (pspec->ref_count > 0)
190 gboolean need_finalize;
192 /* sync with _sink */
193 pspec->ref_count -= 1;
194 need_finalize = pspec->ref_count == 0;
195 G_UNLOCK (pspec_ref_count);
197 G_PARAM_SPEC_GET_CLASS (pspec)->finalize (pspec);
201 G_UNLOCK (pspec_ref_count);
202 g_return_if_fail (pspec->ref_count > 0);
207 g_param_spec_sink (GParamSpec *pspec)
209 g_return_if_fail (G_IS_PARAM_SPEC (pspec));
211 G_LOCK (pspec_ref_count);
212 if (pspec->ref_count > 0)
214 if (g_datalist_id_remove_no_notify (&pspec->qdata, quark_floating))
216 /* sync with _unref */
217 if (pspec->ref_count > 1)
218 pspec->ref_count -= 1;
221 G_UNLOCK (pspec_ref_count);
222 g_param_spec_unref (pspec);
227 G_UNLOCK (pspec_ref_count);
231 G_UNLOCK (pspec_ref_count);
232 g_return_if_fail (pspec->ref_count > 0);
236 G_CONST_RETURN gchar*
237 g_param_spec_get_name (GParamSpec *pspec)
239 g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
244 G_CONST_RETURN gchar*
245 g_param_spec_get_nick (GParamSpec *pspec)
247 g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
249 return pspec->_nick ? pspec->_nick : pspec->name;
252 G_CONST_RETURN gchar*
253 g_param_spec_get_blurb (GParamSpec *pspec)
255 g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
257 return pspec->_blurb;
261 canonicalize_key (gchar *key)
265 for (p = key; *p != 0; p++)
270 (c < '0' || c > '9') &&
271 (c < 'A' || c > 'Z') &&
272 (c < 'a' || c > 'z'))
278 * g_param_spec_internal:
279 * @param_type: the #GType for the property; must be derived from #G_TYPE_PARAM
280 * @name: the canonical name of the property
281 * @nick: the nickname of the property
282 * @blurb: a short description of the property
283 * @flags: a combination of #GParamFlags
285 * Creates a new #GParamSpec instance.
287 * A property name consists of segments consisting of ASCII letters and
288 * digits, separated by either the '-' or '_' character. The first
289 * character of a property name must be a letter. Names which violate these
290 * rules lead to undefined behaviour.
292 * When creating and looking up a #GParamSpec, either separator can be used,
293 * but they cannot be mixed. Using '-' is considerably more efficient and in
294 * fact required when using property names as detail strings for signals.
296 * Return value: a newly allocated #GParamSpec instance
299 g_param_spec_internal (GType param_type,
307 g_return_val_if_fail (G_TYPE_IS_PARAM (param_type) && param_type != G_TYPE_PARAM, NULL);
308 g_return_val_if_fail (name != NULL, NULL);
309 g_return_val_if_fail ((name[0] >= 'A' && name[0] <= 'Z') || (name[0] >= 'a' && name[0] <= 'z'), NULL);
311 pspec = (gpointer) g_type_create_instance (param_type);
312 pspec->name = g_strdup (name);
313 canonicalize_key (pspec->name);
314 pspec->_nick = g_strdup (nick);
315 pspec->_blurb = g_strdup (blurb);
316 pspec->flags = (flags & G_PARAM_USER_MASK) | (flags & G_PARAM_MASK);
322 g_param_spec_get_qdata (GParamSpec *pspec,
325 g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
327 return quark ? g_datalist_id_get_data (&pspec->qdata, quark) : NULL;
331 g_param_spec_set_qdata (GParamSpec *pspec,
335 g_return_if_fail (G_IS_PARAM_SPEC (pspec));
336 g_return_if_fail (quark > 0);
338 g_datalist_id_set_data (&pspec->qdata, quark, data);
342 g_param_spec_set_qdata_full (GParamSpec *pspec,
345 GDestroyNotify destroy)
347 g_return_if_fail (G_IS_PARAM_SPEC (pspec));
348 g_return_if_fail (quark > 0);
350 g_datalist_id_set_data_full (&pspec->qdata, quark, data, data ? destroy : (GDestroyNotify) NULL);
354 g_param_spec_steal_qdata (GParamSpec *pspec,
357 g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
358 g_return_val_if_fail (quark > 0, NULL);
360 return g_datalist_id_remove_no_notify (&pspec->qdata, quark);
364 g_param_value_set_default (GParamSpec *pspec,
367 g_return_if_fail (G_IS_PARAM_SPEC (pspec));
368 g_return_if_fail (G_IS_VALUE (value));
369 g_return_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, value));
371 g_value_reset (value);
372 G_PARAM_SPEC_GET_CLASS (pspec)->value_set_default (pspec, value);
376 g_param_value_defaults (GParamSpec *pspec,
379 GValue dflt_value = { 0, };
382 g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), FALSE);
383 g_return_val_if_fail (G_IS_VALUE (value), FALSE);
384 g_return_val_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, value), FALSE);
386 g_value_init (&dflt_value, G_PARAM_SPEC_VALUE_TYPE (pspec));
387 G_PARAM_SPEC_GET_CLASS (pspec)->value_set_default (pspec, &dflt_value);
388 defaults = G_PARAM_SPEC_GET_CLASS (pspec)->values_cmp (pspec, value, &dflt_value) == 0;
389 g_value_unset (&dflt_value);
395 g_param_value_validate (GParamSpec *pspec,
398 g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), FALSE);
399 g_return_val_if_fail (G_IS_VALUE (value), FALSE);
400 g_return_val_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, value), FALSE);
402 if (G_PARAM_SPEC_GET_CLASS (pspec)->value_validate)
404 GValue oval = *value;
406 if (G_PARAM_SPEC_GET_CLASS (pspec)->value_validate (pspec, value) ||
407 memcmp (&oval.data, &value->data, sizeof (oval.data)))
415 g_param_value_convert (GParamSpec *pspec,
416 const GValue *src_value,
418 gboolean strict_validation)
420 GValue tmp_value = { 0, };
422 g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), FALSE);
423 g_return_val_if_fail (G_IS_VALUE (src_value), FALSE);
424 g_return_val_if_fail (G_IS_VALUE (dest_value), FALSE);
425 g_return_val_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, dest_value), FALSE);
427 /* better leave dest_value untouched when returning FALSE */
429 g_value_init (&tmp_value, G_VALUE_TYPE (dest_value));
430 if (g_value_transform (src_value, &tmp_value) &&
431 (!g_param_value_validate (pspec, &tmp_value) || !strict_validation))
433 g_value_unset (dest_value);
435 /* values are relocatable */
436 memcpy (dest_value, &tmp_value, sizeof (tmp_value));
442 g_value_unset (&tmp_value);
449 g_param_values_cmp (GParamSpec *pspec,
450 const GValue *value1,
451 const GValue *value2)
455 /* param_values_cmp() effectively does: value1 - value2
456 * so the return values are:
457 * -1) value1 < value2
458 * 0) value1 == value2
461 g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), 0);
462 g_return_val_if_fail (G_IS_VALUE (value1), 0);
463 g_return_val_if_fail (G_IS_VALUE (value2), 0);
464 g_return_val_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, value1), 0);
465 g_return_val_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, value2), 0);
467 cmp = G_PARAM_SPEC_GET_CLASS (pspec)->values_cmp (pspec, value1, value2);
469 return CLAMP (cmp, -1, 1);
473 value_param_init (GValue *value)
475 value->data[0].v_pointer = NULL;
479 value_param_free_value (GValue *value)
481 if (value->data[0].v_pointer)
482 g_param_spec_unref (value->data[0].v_pointer);
486 value_param_copy_value (const GValue *src_value,
489 if (src_value->data[0].v_pointer)
490 dest_value->data[0].v_pointer = g_param_spec_ref (src_value->data[0].v_pointer);
492 dest_value->data[0].v_pointer = NULL;
496 value_param_transform_value (const GValue *src_value,
499 if (src_value->data[0].v_pointer &&
500 g_type_is_a (G_PARAM_SPEC_TYPE (dest_value->data[0].v_pointer), G_VALUE_TYPE (dest_value)))
501 dest_value->data[0].v_pointer = g_param_spec_ref (src_value->data[0].v_pointer);
503 dest_value->data[0].v_pointer = NULL;
507 value_param_peek_pointer (const GValue *value)
509 return value->data[0].v_pointer;
513 value_param_collect_value (GValue *value,
514 guint n_collect_values,
515 GTypeCValue *collect_values,
518 if (collect_values[0].v_pointer)
520 GParamSpec *param = collect_values[0].v_pointer;
522 if (param->g_type_instance.g_class == NULL)
523 return g_strconcat ("invalid unclassed param spec pointer for value type `",
524 G_VALUE_TYPE_NAME (value),
527 else if (!g_value_type_compatible (G_PARAM_SPEC_TYPE (param), G_VALUE_TYPE (value)))
528 return g_strconcat ("invalid param spec type `",
529 G_PARAM_SPEC_TYPE_NAME (param),
530 "' for value type `",
531 G_VALUE_TYPE_NAME (value),
534 value->data[0].v_pointer = g_param_spec_ref (param);
537 value->data[0].v_pointer = NULL;
543 value_param_lcopy_value (const GValue *value,
544 guint n_collect_values,
545 GTypeCValue *collect_values,
548 GParamSpec **param_p = collect_values[0].v_pointer;
551 return g_strdup_printf ("value location for `%s' passed as NULL", G_VALUE_TYPE_NAME (value));
553 if (!value->data[0].v_pointer)
555 else if (collect_flags & G_VALUE_NOCOPY_CONTENTS)
556 *param_p = value->data[0].v_pointer;
558 *param_p = g_param_spec_ref (value->data[0].v_pointer);
564 /* --- param spec pool --- */
565 struct _GParamSpecPool
568 gboolean type_prefixing;
569 GHashTable *hash_table;
573 param_spec_pool_hash (gconstpointer key_spec)
575 const GParamSpec *key = key_spec;
577 guint h = key->owner_type;
579 for (p = key->name; *p; p++)
580 h = (h << 5) - h + *p;
586 param_spec_pool_equals (gconstpointer key_spec_1,
587 gconstpointer key_spec_2)
589 const GParamSpec *key1 = key_spec_1;
590 const GParamSpec *key2 = key_spec_2;
592 return (key1->owner_type == key2->owner_type &&
593 strcmp (key1->name, key2->name) == 0);
597 g_param_spec_pool_new (gboolean type_prefixing)
599 static GStaticMutex init_smutex = G_STATIC_MUTEX_INIT;
600 GParamSpecPool *pool = g_new (GParamSpecPool, 1);
602 memcpy (&pool->smutex, &init_smutex, sizeof (init_smutex));
603 pool->type_prefixing = type_prefixing != FALSE;
604 pool->hash_table = g_hash_table_new (param_spec_pool_hash, param_spec_pool_equals);
610 g_param_spec_pool_insert (GParamSpecPool *pool,
616 if (pool && pspec && owner_type > 0 && pspec->owner_type == 0)
618 G_SLOCK (&pool->smutex);
619 for (p = pspec->name; *p; p++)
621 if (!strchr (G_CSET_A_2_Z G_CSET_a_2_z G_CSET_DIGITS "-_", *p))
623 g_warning (G_STRLOC ": pspec name \"%s\" contains invalid characters", pspec->name);
624 G_SUNLOCK (&pool->smutex);
629 pspec->owner_type = owner_type;
630 g_param_spec_ref (pspec);
631 g_hash_table_insert (pool->hash_table, pspec, pspec);
632 G_SUNLOCK (&pool->smutex);
636 g_return_if_fail (pool != NULL);
637 g_return_if_fail (pspec);
638 g_return_if_fail (owner_type > 0);
639 g_return_if_fail (pspec->owner_type == 0);
644 g_param_spec_pool_remove (GParamSpecPool *pool,
649 G_SLOCK (&pool->smutex);
650 if (g_hash_table_remove (pool->hash_table, pspec))
651 g_param_spec_unref (pspec);
653 g_warning (G_STRLOC ": attempt to remove unknown pspec `%s' from pool", pspec->name);
654 G_SUNLOCK (&pool->smutex);
658 g_return_if_fail (pool != NULL);
659 g_return_if_fail (pspec);
663 static inline GParamSpec*
664 param_spec_ht_lookup (GHashTable *hash_table,
665 const gchar *param_name,
667 gboolean walk_ancestors)
669 GParamSpec key, *pspec;
671 key.owner_type = owner_type;
672 key.name = (gchar*) param_name;
676 pspec = g_hash_table_lookup (hash_table, &key);
679 key.owner_type = g_type_parent (key.owner_type);
681 while (key.owner_type);
683 pspec = g_hash_table_lookup (hash_table, &key);
687 /* try canonicalized form */
688 key.name = g_strdup (param_name);
689 key.owner_type = owner_type;
691 canonicalize_key (key.name);
695 pspec = g_hash_table_lookup (hash_table, &key);
701 key.owner_type = g_type_parent (key.owner_type);
703 while (key.owner_type);
705 pspec = g_hash_table_lookup (hash_table, &key);
713 g_param_spec_pool_lookup (GParamSpecPool *pool,
714 const gchar *param_name,
716 gboolean walk_ancestors)
721 if (!pool || !param_name)
723 g_return_val_if_fail (pool != NULL, NULL);
724 g_return_val_if_fail (param_name != NULL, NULL);
727 G_SLOCK (&pool->smutex);
729 delim = pool->type_prefixing ? strchr (param_name, ':') : NULL;
731 /* try quick and away, i.e. without prefix */
734 pspec = param_spec_ht_lookup (pool->hash_table, param_name, owner_type, walk_ancestors);
735 G_SUNLOCK (&pool->smutex);
740 /* strip type prefix */
741 if (pool->type_prefixing && delim[1] == ':')
743 guint l = delim - param_name;
744 gchar stack_buffer[32], *buffer = l < 32 ? stack_buffer : g_new (gchar, l + 1);
747 strncpy (buffer, param_name, delim - param_name);
749 type = g_type_from_name (buffer);
752 if (type) /* type==0 isn't a valid type pefix */
754 /* sanity check, these cases don't make a whole lot of sense */
755 if ((!walk_ancestors && type != owner_type) || !g_type_is_a (owner_type, type))
757 G_SUNLOCK (&pool->smutex);
763 pspec = param_spec_ht_lookup (pool->hash_table, param_name, owner_type, walk_ancestors);
764 G_SUNLOCK (&pool->smutex);
769 /* malformed param_name */
771 G_SUNLOCK (&pool->smutex);
777 pool_list (gpointer key,
781 GParamSpec *pspec = value;
782 gpointer *data = user_data;
783 GType owner_type = (GType) data[1];
785 if (owner_type == pspec->owner_type)
786 data[0] = g_list_prepend (data[0], pspec);
790 g_param_spec_pool_list_owned (GParamSpecPool *pool,
795 g_return_val_if_fail (pool != NULL, NULL);
796 g_return_val_if_fail (owner_type > 0, NULL);
798 G_SLOCK (&pool->smutex);
800 data[1] = (gpointer) owner_type;
801 g_hash_table_foreach (pool->hash_table, pool_list, &data);
802 G_SUNLOCK (&pool->smutex);
808 pspec_compare_id (gconstpointer a,
811 const GParamSpec *pspec1 = a, *pspec2 = b;
813 return pspec1->param_id < pspec2->param_id ? -1 : pspec1->param_id > pspec2->param_id;
816 static inline GSList*
817 pspec_list_remove_overridden (GSList *plist,
822 GSList *rlist = NULL;
826 GSList *tmp = plist->next;
827 GParamSpec *pspec = plist->data;
829 if (param_spec_ht_lookup (ht, pspec->name, owner_type, TRUE) != pspec)
830 g_slist_free_1 (plist);
843 pool_depth_list (gpointer key,
847 GParamSpec *pspec = value;
848 gpointer *data = user_data;
849 GSList **slists = data[0];
850 GType owner_type = (GType) data[1];
852 if (g_type_is_a (owner_type, pspec->owner_type))
854 guint d = g_type_depth (pspec->owner_type);
856 slists[d - 1] = g_slist_prepend (slists[d - 1], pspec);
860 GParamSpec** /* free result */
861 g_param_spec_pool_list (GParamSpecPool *pool,
865 GParamSpec **pspecs, **p;
866 GSList **slists, *node;
870 g_return_val_if_fail (pool != NULL, NULL);
871 g_return_val_if_fail (owner_type > 0, NULL);
872 g_return_val_if_fail (n_pspecs_p != NULL, NULL);
874 G_SLOCK (&pool->smutex);
876 d = g_type_depth (owner_type);
877 slists = g_new0 (GSList*, d);
879 data[1] = (gpointer) owner_type;
880 g_hash_table_foreach (pool->hash_table, pool_depth_list, &data);
881 for (i = 0; i < d - 1; i++)
882 slists[i] = pspec_list_remove_overridden (slists[i], pool->hash_table, owner_type, n_pspecs_p);
883 *n_pspecs_p += g_slist_length (slists[i]);
884 pspecs = g_new (GParamSpec*, *n_pspecs_p + 1);
886 for (i = 0; i < d; i++)
888 slists[i] = g_slist_sort (slists[i], pspec_compare_id);
889 for (node = slists[i]; node; node = node->next)
891 g_slist_free (slists[i]);
895 G_SUNLOCK (&pool->smutex);
901 /* --- auxillary functions --- */
906 void (*finalize) (GParamSpec *pspec);
907 void (*value_set_default) (GParamSpec *pspec,
909 gboolean (*value_validate) (GParamSpec *pspec,
911 gint (*values_cmp) (GParamSpec *pspec,
912 const GValue *value1,
913 const GValue *value2);
914 } ParamSpecClassInfo;
917 param_spec_generic_class_init (gpointer g_class,
920 GParamSpecClass *class = g_class;
921 ParamSpecClassInfo *info = class_data;
923 class->value_type = info->value_type;
925 class->finalize = info->finalize; /* optional */
926 class->value_set_default = info->value_set_default;
927 if (info->value_validate)
928 class->value_validate = info->value_validate; /* optional */
929 class->values_cmp = info->values_cmp;
934 default_value_set_default (GParamSpec *pspec,
937 /* value is already zero initialized */
941 default_values_cmp (GParamSpec *pspec,
942 const GValue *value1,
943 const GValue *value2)
945 return memcmp (&value1->data, &value2->data, sizeof (value1->data));
949 g_param_type_register_static (const gchar *name,
950 const GParamSpecTypeInfo *pspec_info)
953 sizeof (GParamSpecClass), /* class_size */
954 NULL, /* base_init */
955 NULL, /* base_destroy */
956 param_spec_generic_class_init, /* class_init */
957 NULL, /* class_destroy */
958 NULL, /* class_data */
959 0, /* instance_size */
960 16, /* n_preallocs */
961 NULL, /* instance_init */
963 ParamSpecClassInfo *cinfo;
965 g_return_val_if_fail (name != NULL, 0);
966 g_return_val_if_fail (pspec_info != NULL, 0);
967 g_return_val_if_fail (g_type_from_name (name) == 0, 0);
968 g_return_val_if_fail (pspec_info->instance_size >= sizeof (GParamSpec), 0);
969 g_return_val_if_fail (g_type_name (pspec_info->value_type) != NULL, 0);
970 /* default: g_return_val_if_fail (pspec_info->value_set_default != NULL, 0); */
971 /* optional: g_return_val_if_fail (pspec_info->value_validate != NULL, 0); */
972 /* default: g_return_val_if_fail (pspec_info->values_cmp != NULL, 0); */
974 info.instance_size = pspec_info->instance_size;
975 info.n_preallocs = pspec_info->n_preallocs;
976 info.instance_init = (GInstanceInitFunc) pspec_info->instance_init;
977 cinfo = g_new (ParamSpecClassInfo, 1);
978 cinfo->value_type = pspec_info->value_type;
979 cinfo->finalize = pspec_info->finalize;
980 cinfo->value_set_default = pspec_info->value_set_default ? pspec_info->value_set_default : default_value_set_default;
981 cinfo->value_validate = pspec_info->value_validate;
982 cinfo->values_cmp = pspec_info->values_cmp ? pspec_info->values_cmp : default_values_cmp;
983 info.class_data = cinfo;
985 return g_type_register_static (G_TYPE_PARAM, name, &info, 0);
989 g_value_set_param (GValue *value,
992 g_return_if_fail (G_VALUE_HOLDS_PARAM (value));
994 g_return_if_fail (G_IS_PARAM_SPEC (param));
996 if (value->data[0].v_pointer)
997 g_param_spec_unref (value->data[0].v_pointer);
998 value->data[0].v_pointer = param;
999 if (value->data[0].v_pointer)
1000 g_param_spec_ref (value->data[0].v_pointer);
1004 g_value_set_param_take_ownership (GValue *value,
1007 g_return_if_fail (G_VALUE_HOLDS_PARAM (value));
1009 g_return_if_fail (G_IS_PARAM_SPEC (param));
1011 if (value->data[0].v_pointer)
1012 g_param_spec_unref (value->data[0].v_pointer);
1013 value->data[0].v_pointer = param; /* we take over the reference count */
1017 g_value_get_param (const GValue *value)
1019 g_return_val_if_fail (G_VALUE_HOLDS_PARAM (value), NULL);
1021 return value->data[0].v_pointer;
1025 g_value_dup_param (const GValue *value)
1027 g_return_val_if_fail (G_VALUE_HOLDS_PARAM (value), NULL);
1029 return value->data[0].v_pointer ? g_param_spec_ref (value->data[0].v_pointer) : NULL;