/* GObject - GLib Type, Object, Parameter and Signal Library
- * Copyright (C) 1997, 1998, 1999, 2000 Tim Janik and Red Hat, Inc.
+ * Copyright (C) 1997-1999, 2000-2001 Tim Janik and Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* 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.
+ * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
-#include "gparam.h"
+/*
+ * MT safe
+ */
-#include <string.h>
+#include "config.h"
+#include <string.h>
+#include "gparam.h"
+#include "gparamspecs.h"
+#include "gvaluecollector.h"
+#include "gtype-private.h"
-/* --- defines --- */
-#define G_PARAM_SPEC_CLASS(class) (G_TYPE_CHECK_CLASS_CAST ((class), G_TYPE_PARAM, GParamSpecClass))
+/**
+ * SECTION:gparamspec
+ * @short_description: Metadata for parameter specifications
+ * @see_also: g_object_class_install_property(), g_object_set(),
+ * g_object_get(), g_object_set_property(), g_object_get_property(),
+ * g_value_register_transform_func()
+ * @title: GParamSpec
+ *
+ * #GParamSpec is an object structure that encapsulates the metadata
+ * required to specify parameters, such as e.g. #GObject properties.
+ *
+ * ## Parameter names # {#canonical-parameter-names}
+ *
+ * Parameter names need to start with a letter (a-z or A-Z).
+ * Subsequent characters can be letters, numbers or a '-'.
+ * All other characters are replaced by a '-' during construction.
+ * The result of this replacement is called the canonical name of
+ * the parameter.
+ */
+/* --- defines --- */
+#define PARAM_FLOATING_FLAG 0x2
+#define G_PARAM_USER_MASK (~0 << G_PARAM_USER_SHIFT)
+#define PSPEC_APPLIES_TO_VALUE(pspec, value) (G_TYPE_CHECK_VALUE_TYPE ((value), G_PARAM_SPEC_VALUE_TYPE (pspec)))
+
/* --- prototypes --- */
static void g_param_spec_class_base_init (GParamSpecClass *class);
static void g_param_spec_class_base_finalize (GParamSpecClass *class);
static void g_param_spec_class_init (GParamSpecClass *class,
gpointer class_data);
-static void g_param_spec_init (GParamSpec *pspec);
+static void g_param_spec_init (GParamSpec *pspec,
+ GParamSpecClass *class);
static void g_param_spec_finalize (GParamSpec *pspec);
+static void value_param_init (GValue *value);
+static void value_param_free_value (GValue *value);
+static void value_param_copy_value (const GValue *src_value,
+ GValue *dest_value);
+static void value_param_transform_value (const GValue *src_value,
+ GValue *dest_value);
+static gpointer value_param_peek_pointer (const GValue *value);
+static gchar* value_param_collect_value (GValue *value,
+ guint n_collect_values,
+ GTypeCValue *collect_values,
+ guint collect_flags);
+static gchar* value_param_lcopy_value (const GValue *value,
+ guint n_collect_values,
+ GTypeCValue *collect_values,
+ guint collect_flags);
+
+typedef struct
+{
+ GValue default_value;
+} GParamSpecPrivate;
+static gint g_param_private_offset;
/* --- functions --- */
+static inline GParamSpecPrivate *
+g_param_spec_get_private (GParamSpec *pspec)
+{
+ return &G_STRUCT_MEMBER (GParamSpecPrivate, pspec, g_param_private_offset);
+}
+
void
-g_param_type_init (void) /* sync with gtype.c */
+_g_param_type_init (void)
{
static const GTypeFundamentalInfo finfo = {
(G_TYPE_FLAG_CLASSED |
G_TYPE_FLAG_DERIVABLE |
G_TYPE_FLAG_DEEP_DERIVABLE),
};
- static const GTypeInfo param_spec_info = {
+ static const GTypeValueTable param_value_table = {
+ value_param_init, /* value_init */
+ value_param_free_value, /* value_free */
+ value_param_copy_value, /* value_copy */
+ value_param_peek_pointer, /* value_peek_pointer */
+ "p", /* collect_format */
+ value_param_collect_value, /* collect_value */
+ "p", /* lcopy_format */
+ value_param_lcopy_value, /* lcopy_value */
+ };
+ const GTypeInfo param_spec_info = {
sizeof (GParamSpecClass),
(GBaseInitFunc) g_param_spec_class_base_init,
0, /* n_preallocs */
(GInstanceInitFunc) g_param_spec_init,
- NULL, /* value_table */
+ ¶m_value_table,
};
GType type;
- type = g_type_register_fundamental (G_TYPE_PARAM, "GParam", ¶m_spec_info, &finfo, G_TYPE_FLAG_ABSTRACT);
+ /* This should be registered as GParamSpec instead of GParam, for
+ * consistency sake, so that type name can be mapped to struct name,
+ * However, some language bindings, most noticeable the python ones
+ * depends on the "GParam" identifier, see #548689
+ */
+ type = g_type_register_fundamental (G_TYPE_PARAM, g_intern_static_string ("GParam"), ¶m_spec_info, &finfo, G_TYPE_FLAG_ABSTRACT);
g_assert (type == G_TYPE_PARAM);
+ g_param_private_offset = g_type_add_instance_private (type, sizeof (GParamSpecPrivate));
+ g_value_register_transform_func (G_TYPE_PARAM, G_TYPE_PARAM, value_param_transform_value);
}
static void
class->value_set_default = NULL;
class->value_validate = NULL;
class->values_cmp = NULL;
+
+ g_type_class_adjust_private_offset (class, &g_param_private_offset);
}
static void
-g_param_spec_init (GParamSpec *pspec)
+g_param_spec_init (GParamSpec *pspec,
+ GParamSpecClass *class)
{
pspec->name = NULL;
- pspec->nick = NULL;
- pspec->blurb = NULL;
+ pspec->_nick = NULL;
+ pspec->_blurb = NULL;
pspec->flags = 0;
+ pspec->value_type = class->value_type;
pspec->owner_type = 0;
pspec->qdata = NULL;
+ g_datalist_set_flags (&pspec->qdata, PARAM_FLOATING_FLAG);
pspec->ref_count = 1;
+ pspec->param_id = 0;
}
static void
g_param_spec_finalize (GParamSpec *pspec)
{
+ GParamSpecPrivate *priv = g_param_spec_get_private (pspec);
+
+ if (priv->default_value.g_type)
+ g_value_reset (&priv->default_value);
+
g_datalist_clear (&pspec->qdata);
-
- g_free (pspec->name);
- g_free (pspec->nick);
- g_free (pspec->blurb);
+
+ if (!(pspec->flags & G_PARAM_STATIC_NICK))
+ g_free (pspec->_nick);
+
+ if (!(pspec->flags & G_PARAM_STATIC_BLURB))
+ g_free (pspec->_blurb);
g_type_free_instance ((GTypeInstance*) pspec);
}
+/**
+ * g_param_spec_ref: (skip)
+ * @pspec: a valid #GParamSpec
+ *
+ * Increments the reference count of @pspec.
+ *
+ * Returns: the #GParamSpec that was passed into this function
+ */
GParamSpec*
g_param_spec_ref (GParamSpec *pspec)
{
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
- g_return_val_if_fail (pspec->ref_count > 0, NULL);
- pspec->ref_count += 1;
+ g_atomic_int_inc ((int *)&pspec->ref_count);
return pspec;
}
+/**
+ * g_param_spec_unref: (skip)
+ * @pspec: a valid #GParamSpec
+ *
+ * Decrements the reference count of a @pspec.
+ */
void
g_param_spec_unref (GParamSpec *pspec)
{
+ gboolean is_zero;
+
+ g_return_if_fail (G_IS_PARAM_SPEC (pspec));
+
+ is_zero = g_atomic_int_dec_and_test ((int *)&pspec->ref_count);
+
+ if (G_UNLIKELY (is_zero))
+ {
+ G_PARAM_SPEC_GET_CLASS (pspec)->finalize (pspec);
+ }
+}
+
+/**
+ * g_param_spec_sink:
+ * @pspec: a valid #GParamSpec
+ *
+ * The initial reference count of a newly created #GParamSpec is 1,
+ * even though no one has explicitly called g_param_spec_ref() on it
+ * yet. So the initial reference count is flagged as "floating", until
+ * someone calls `g_param_spec_ref (pspec); g_param_spec_sink
+ * (pspec);` in sequence on it, taking over the initial
+ * reference count (thus ending up with a @pspec that has a reference
+ * count of 1 still, but is not flagged "floating" anymore).
+ */
+void
+g_param_spec_sink (GParamSpec *pspec)
+{
+ gsize oldvalue;
g_return_if_fail (G_IS_PARAM_SPEC (pspec));
- g_return_if_fail (pspec->ref_count > 0);
- pspec->ref_count -= 1;
- if (pspec->ref_count == 0)
- G_PARAM_SPEC_GET_CLASS (pspec)->finalize (pspec);
+ oldvalue = g_atomic_pointer_and (&pspec->qdata, ~(gsize)PARAM_FLOATING_FLAG);
+ if (oldvalue & PARAM_FLOATING_FLAG)
+ g_param_spec_unref (pspec);
+}
+
+/**
+ * g_param_spec_ref_sink: (skip)
+ * @pspec: a valid #GParamSpec
+ *
+ * Convenience function to ref and sink a #GParamSpec.
+ *
+ * Since: 2.10
+ * Returns: the #GParamSpec that was passed into this function
+ */
+GParamSpec*
+g_param_spec_ref_sink (GParamSpec *pspec)
+{
+ gsize oldvalue;
+ g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
+
+ oldvalue = g_atomic_pointer_and (&pspec->qdata, ~(gsize)PARAM_FLOATING_FLAG);
+ if (!(oldvalue & PARAM_FLOATING_FLAG))
+ g_param_spec_ref (pspec);
+
+ return pspec;
+}
+
+/**
+ * g_param_spec_get_name:
+ * @pspec: a valid #GParamSpec
+ *
+ * Get the name of a #GParamSpec.
+ *
+ * The name is always an "interned" string (as per g_intern_string()).
+ * This allows for pointer-value comparisons.
+ *
+ * Returns: the name of @pspec.
+ */
+const gchar *
+g_param_spec_get_name (GParamSpec *pspec)
+{
+ g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
+
+ return pspec->name;
+}
+
+/**
+ * g_param_spec_get_nick:
+ * @pspec: a valid #GParamSpec
+ *
+ * Get the nickname of a #GParamSpec.
+ *
+ * Returns: the nickname of @pspec.
+ */
+const gchar *
+g_param_spec_get_nick (GParamSpec *pspec)
+{
+ g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
+
+ if (pspec->_nick)
+ return pspec->_nick;
+ else
+ {
+ GParamSpec *redirect_target;
+
+ redirect_target = g_param_spec_get_redirect_target (pspec);
+ if (redirect_target && redirect_target->_nick)
+ return redirect_target->_nick;
+ }
+
+ return pspec->name;
+}
+
+/**
+ * g_param_spec_get_blurb:
+ * @pspec: a valid #GParamSpec
+ *
+ * Get the short description of a #GParamSpec.
+ *
+ * Returns: the short description of @pspec.
+ */
+const gchar *
+g_param_spec_get_blurb (GParamSpec *pspec)
+{
+ g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
+
+ if (pspec->_blurb)
+ return pspec->_blurb;
+ else
+ {
+ GParamSpec *redirect_target;
+
+ redirect_target = g_param_spec_get_redirect_target (pspec);
+ if (redirect_target && redirect_target->_blurb)
+ return redirect_target->_blurb;
+ }
+
+ return NULL;
+}
+
+static void
+canonicalize_key (gchar *key)
+{
+ gchar *p;
+
+ for (p = key; *p != 0; p++)
+ {
+ gchar c = *p;
+
+ if (c != '-' &&
+ (c < '0' || c > '9') &&
+ (c < 'A' || c > 'Z') &&
+ (c < 'a' || c > 'z'))
+ *p = '-';
+ }
+}
+
+static gboolean
+is_canonical (const gchar *key)
+{
+ const gchar *p;
+
+ for (p = key; *p != 0; p++)
+ {
+ gchar c = *p;
+
+ if (c != '-' &&
+ (c < '0' || c > '9') &&
+ (c < 'A' || c > 'Z') &&
+ (c < 'a' || c > 'z'))
+ return FALSE;
+ }
+
+ return TRUE;
}
+/**
+ * g_param_spec_internal: (skip)
+ * @param_type: the #GType for the property; must be derived from #G_TYPE_PARAM
+ * @name: the canonical name of the property
+ * @nick: the nickname of the property
+ * @blurb: a short description of the property
+ * @flags: a combination of #GParamFlags
+ *
+ * Creates a new #GParamSpec instance.
+ *
+ * A property name consists of segments consisting of ASCII letters and
+ * digits, separated by either the '-' or '_' character. The first
+ * character of a property name must be a letter. Names which violate these
+ * rules lead to undefined behaviour.
+ *
+ * When creating and looking up a #GParamSpec, either separator can be
+ * used, but they cannot be mixed. Using '-' is considerably more
+ * efficient and in fact required when using property names as detail
+ * strings for signals.
+ *
+ * Beyond the name, #GParamSpecs have two more descriptive
+ * strings associated with them, the @nick, which should be suitable
+ * for use as a label for the property in a property editor, and the
+ * @blurb, which should be a somewhat longer description, suitable for
+ * e.g. a tooltip. The @nick and @blurb should ideally be localized.
+ *
+ * Returns: a newly allocated #GParamSpec instance
+ */
gpointer
g_param_spec_internal (GType param_type,
const gchar *name,
GParamFlags flags)
{
GParamSpec *pspec;
-
+
g_return_val_if_fail (G_TYPE_IS_PARAM (param_type) && param_type != G_TYPE_PARAM, NULL);
g_return_val_if_fail (name != NULL, NULL);
-
+ g_return_val_if_fail ((name[0] >= 'A' && name[0] <= 'Z') || (name[0] >= 'a' && name[0] <= 'z'), NULL);
+ g_return_val_if_fail (!(flags & G_PARAM_STATIC_NAME) || is_canonical (name), NULL);
+
pspec = (gpointer) g_type_create_instance (param_type);
- pspec->name = g_strdup (name);
- g_strcanon (pspec->name, G_CSET_A_2_Z G_CSET_a_2_z G_CSET_DIGITS "-", '-');
- pspec->nick = g_strdup (nick ? nick : pspec->name);
- pspec->blurb = g_strdup (blurb);
- pspec->flags = (flags & G_PARAM_USER_MASK) | (flags & G_PARAM_MASK);
+ if (flags & G_PARAM_STATIC_NAME)
+ {
+ /* pspec->name is not freed if (flags & G_PARAM_STATIC_NAME) */
+ pspec->name = (gchar *) g_intern_static_string (name);
+ if (!is_canonical (pspec->name))
+ g_warning ("G_PARAM_STATIC_NAME used with non-canonical pspec name: %s", pspec->name);
+ }
+ else
+ {
+ if (is_canonical (name))
+ pspec->name = (gchar *) g_intern_string (name);
+ else
+ {
+ gchar *tmp = g_strdup (name);
+ canonicalize_key (tmp);
+ pspec->name = (gchar *) g_intern_string (tmp);
+ g_free (tmp);
+ }
+ }
+
+ if (flags & G_PARAM_STATIC_NICK)
+ pspec->_nick = (gchar*) nick;
+ else
+ pspec->_nick = g_strdup (nick);
+
+ if (flags & G_PARAM_STATIC_BLURB)
+ pspec->_blurb = (gchar*) blurb;
+ else
+ pspec->_blurb = g_strdup (blurb);
+
+ pspec->flags = (flags & G_PARAM_USER_MASK) | (flags & G_PARAM_MASK);
+
return pspec;
}
+/**
+ * g_param_spec_get_qdata:
+ * @pspec: a valid #GParamSpec
+ * @quark: a #GQuark, naming the user data pointer
+ *
+ * Gets back user data pointers stored via g_param_spec_set_qdata().
+ *
+ * Returns: (transfer none): the user data pointer set, or %NULL
+ */
gpointer
g_param_spec_get_qdata (GParamSpec *pspec,
GQuark quark)
return quark ? g_datalist_id_get_data (&pspec->qdata, quark) : NULL;
}
+/**
+ * g_param_spec_set_qdata:
+ * @pspec: the #GParamSpec to set store a user data pointer
+ * @quark: a #GQuark, naming the user data pointer
+ * @data: an opaque user data pointer
+ *
+ * Sets an opaque, named pointer on a #GParamSpec. The name is
+ * specified through a #GQuark (retrieved e.g. via
+ * g_quark_from_static_string()), and the pointer can be gotten back
+ * from the @pspec with g_param_spec_get_qdata(). Setting a
+ * previously set user data pointer, overrides (frees) the old pointer
+ * set, using %NULL as pointer essentially removes the data stored.
+ */
void
g_param_spec_set_qdata (GParamSpec *pspec,
GQuark quark,
g_datalist_id_set_data (&pspec->qdata, quark, data);
}
+/**
+ * g_param_spec_set_qdata_full: (skip)
+ * @pspec: the #GParamSpec to set store a user data pointer
+ * @quark: a #GQuark, naming the user data pointer
+ * @data: an opaque user data pointer
+ * @destroy: function to invoke with @data as argument, when @data needs to
+ * be freed
+ *
+ * This function works like g_param_spec_set_qdata(), but in addition,
+ * a `void (*destroy) (gpointer)` function may be
+ * specified which is called with @data as argument when the @pspec is
+ * finalized, or the data is being overwritten by a call to
+ * g_param_spec_set_qdata() with the same @quark.
+ */
void
g_param_spec_set_qdata_full (GParamSpec *pspec,
GQuark quark,
g_datalist_id_set_data_full (&pspec->qdata, quark, data, data ? destroy : (GDestroyNotify) NULL);
}
+/**
+ * g_param_spec_steal_qdata:
+ * @pspec: the #GParamSpec to get a stored user data pointer from
+ * @quark: a #GQuark, naming the user data pointer
+ *
+ * Gets back user data pointers stored via g_param_spec_set_qdata()
+ * and removes the @data from @pspec without invoking its destroy()
+ * function (if any was set). Usually, calling this function is only
+ * required to update user data pointers with a destroy notifier.
+ *
+ * Returns: (transfer none): the user data pointer set, or %NULL
+ */
gpointer
g_param_spec_steal_qdata (GParamSpec *pspec,
GQuark quark)
return g_datalist_id_remove_no_notify (&pspec->qdata, quark);
}
+/**
+ * g_param_spec_get_redirect_target:
+ * @pspec: a #GParamSpec
+ *
+ * If the paramspec redirects operations to another paramspec,
+ * returns that paramspec. Redirect is used typically for
+ * providing a new implementation of a property in a derived
+ * type while preserving all the properties from the parent
+ * type. Redirection is established by creating a property
+ * of type #GParamSpecOverride. See g_object_class_override_property()
+ * for an example of the use of this capability.
+ *
+ * Since: 2.4
+ *
+ * Returns: (transfer none): paramspec to which requests on this
+ * paramspec should be redirected, or %NULL if none.
+ */
+GParamSpec*
+g_param_spec_get_redirect_target (GParamSpec *pspec)
+{
+ g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
+
+ if (G_IS_PARAM_SPEC_OVERRIDE (pspec))
+ {
+ GParamSpecOverride *ospec = G_PARAM_SPEC_OVERRIDE (pspec);
+
+ return ospec->overridden;
+ }
+ else
+ return NULL;
+}
+
+/**
+ * g_param_value_set_default:
+ * @pspec: a valid #GParamSpec
+ * @value: a #GValue of correct type for @pspec
+ *
+ * Sets @value to its default value as specified in @pspec.
+ */
void
g_param_value_set_default (GParamSpec *pspec,
GValue *value)
{
g_return_if_fail (G_IS_PARAM_SPEC (pspec));
g_return_if_fail (G_IS_VALUE (value));
- g_return_if_fail (G_IS_PARAM_VALUE (pspec, value));
+ g_return_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, value));
g_value_reset (value);
G_PARAM_SPEC_GET_CLASS (pspec)->value_set_default (pspec, value);
}
+/**
+ * g_param_value_defaults:
+ * @pspec: a valid #GParamSpec
+ * @value: a #GValue of correct type for @pspec
+ *
+ * Checks whether @value contains the default value as specified in @pspec.
+ *
+ * Returns: whether @value contains the canonical default for this @pspec
+ */
gboolean
g_param_value_defaults (GParamSpec *pspec,
GValue *value)
{
- GValue dflt_value = { 0, };
+ GValue dflt_value = G_VALUE_INIT;
gboolean defaults;
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), FALSE);
g_return_val_if_fail (G_IS_VALUE (value), FALSE);
- g_return_val_if_fail (G_IS_PARAM_VALUE (pspec, value), FALSE);
+ g_return_val_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, value), FALSE);
g_value_init (&dflt_value, G_PARAM_SPEC_VALUE_TYPE (pspec));
G_PARAM_SPEC_GET_CLASS (pspec)->value_set_default (pspec, &dflt_value);
return defaults;
}
+/**
+ * g_param_value_validate:
+ * @pspec: a valid #GParamSpec
+ * @value: a #GValue of correct type for @pspec
+ *
+ * Ensures that the contents of @value comply with the specifications
+ * set out by @pspec. For example, a #GParamSpecInt might require
+ * that integers stored in @value may not be smaller than -42 and not be
+ * greater than +42. If @value contains an integer outside of this range,
+ * it is modified accordingly, so the resulting value will fit into the
+ * range -42 .. +42.
+ *
+ * Returns: whether modifying @value was necessary to ensure validity
+ */
gboolean
g_param_value_validate (GParamSpec *pspec,
GValue *value)
{
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), FALSE);
g_return_val_if_fail (G_IS_VALUE (value), FALSE);
- g_return_val_if_fail (G_IS_PARAM_VALUE (pspec, value), FALSE);
+ g_return_val_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, value), FALSE);
if (G_PARAM_SPEC_GET_CLASS (pspec)->value_validate)
{
return FALSE;
}
+/**
+ * g_param_value_convert:
+ * @pspec: a valid #GParamSpec
+ * @src_value: souce #GValue
+ * @dest_value: destination #GValue of correct type for @pspec
+ * @strict_validation: %TRUE requires @dest_value to conform to @pspec
+ * without modifications
+ *
+ * Transforms @src_value into @dest_value if possible, and then
+ * validates @dest_value, in order for it to conform to @pspec. If
+ * @strict_validation is %TRUE this function will only succeed if the
+ * transformed @dest_value complied to @pspec without modifications.
+ *
+ * See also g_value_type_transformable(), g_value_transform() and
+ * g_param_value_validate().
+ *
+ * Returns: %TRUE if transformation and validation were successful,
+ * %FALSE otherwise and @dest_value is left untouched.
+ */
+gboolean
+g_param_value_convert (GParamSpec *pspec,
+ const GValue *src_value,
+ GValue *dest_value,
+ gboolean strict_validation)
+{
+ GValue tmp_value = G_VALUE_INIT;
+
+ g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), FALSE);
+ g_return_val_if_fail (G_IS_VALUE (src_value), FALSE);
+ g_return_val_if_fail (G_IS_VALUE (dest_value), FALSE);
+ g_return_val_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, dest_value), FALSE);
+
+ /* better leave dest_value untouched when returning FALSE */
+
+ g_value_init (&tmp_value, G_VALUE_TYPE (dest_value));
+ if (g_value_transform (src_value, &tmp_value) &&
+ (!g_param_value_validate (pspec, &tmp_value) || !strict_validation))
+ {
+ g_value_unset (dest_value);
+
+ /* values are relocatable */
+ memcpy (dest_value, &tmp_value, sizeof (tmp_value));
+
+ return TRUE;
+ }
+ else
+ {
+ g_value_unset (&tmp_value);
+
+ return FALSE;
+ }
+}
+
+/**
+ * g_param_values_cmp:
+ * @pspec: a valid #GParamSpec
+ * @value1: a #GValue of correct type for @pspec
+ * @value2: a #GValue of correct type for @pspec
+ *
+ * Compares @value1 with @value2 according to @pspec, and return -1, 0 or +1,
+ * if @value1 is found to be less than, equal to or greater than @value2,
+ * respectively.
+ *
+ * Returns: -1, 0 or +1, for a less than, equal to or greater than result
+ */
gint
g_param_values_cmp (GParamSpec *pspec,
const GValue *value1,
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), 0);
g_return_val_if_fail (G_IS_VALUE (value1), 0);
g_return_val_if_fail (G_IS_VALUE (value2), 0);
- g_return_val_if_fail (G_IS_PARAM_VALUE (pspec, value1), 0);
- g_return_val_if_fail (G_IS_PARAM_VALUE (pspec, value2), 0);
+ g_return_val_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, value1), 0);
+ g_return_val_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, value2), 0);
cmp = G_PARAM_SPEC_GET_CLASS (pspec)->values_cmp (pspec, value1, value2);
return CLAMP (cmp, -1, 1);
}
+static void
+value_param_init (GValue *value)
+{
+ value->data[0].v_pointer = NULL;
+}
+
+static void
+value_param_free_value (GValue *value)
+{
+ if (value->data[0].v_pointer)
+ g_param_spec_unref (value->data[0].v_pointer);
+}
+
+static void
+value_param_copy_value (const GValue *src_value,
+ GValue *dest_value)
+{
+ if (src_value->data[0].v_pointer)
+ dest_value->data[0].v_pointer = g_param_spec_ref (src_value->data[0].v_pointer);
+ else
+ dest_value->data[0].v_pointer = NULL;
+}
+
+static void
+value_param_transform_value (const GValue *src_value,
+ GValue *dest_value)
+{
+ if (src_value->data[0].v_pointer &&
+ g_type_is_a (G_PARAM_SPEC_TYPE (dest_value->data[0].v_pointer), G_VALUE_TYPE (dest_value)))
+ dest_value->data[0].v_pointer = g_param_spec_ref (src_value->data[0].v_pointer);
+ else
+ dest_value->data[0].v_pointer = NULL;
+}
+
+static gpointer
+value_param_peek_pointer (const GValue *value)
+{
+ return value->data[0].v_pointer;
+}
+
+static gchar*
+value_param_collect_value (GValue *value,
+ guint n_collect_values,
+ GTypeCValue *collect_values,
+ guint collect_flags)
+{
+ if (collect_values[0].v_pointer)
+ {
+ GParamSpec *param = collect_values[0].v_pointer;
+
+ if (param->g_type_instance.g_class == NULL)
+ return g_strconcat ("invalid unclassed param spec pointer for value type '",
+ G_VALUE_TYPE_NAME (value),
+ "'",
+ NULL);
+ else if (!g_value_type_compatible (G_PARAM_SPEC_TYPE (param), G_VALUE_TYPE (value)))
+ return g_strconcat ("invalid param spec type '",
+ G_PARAM_SPEC_TYPE_NAME (param),
+ "' for value type '",
+ G_VALUE_TYPE_NAME (value),
+ "'",
+ NULL);
+ value->data[0].v_pointer = g_param_spec_ref (param);
+ }
+ else
+ value->data[0].v_pointer = NULL;
+
+ return NULL;
+}
+
+static gchar*
+value_param_lcopy_value (const GValue *value,
+ guint n_collect_values,
+ GTypeCValue *collect_values,
+ guint collect_flags)
+{
+ GParamSpec **param_p = collect_values[0].v_pointer;
+
+ if (!param_p)
+ return g_strdup_printf ("value location for '%s' passed as NULL", G_VALUE_TYPE_NAME (value));
+
+ if (!value->data[0].v_pointer)
+ *param_p = NULL;
+ else if (collect_flags & G_VALUE_NOCOPY_CONTENTS)
+ *param_p = value->data[0].v_pointer;
+ else
+ *param_p = g_param_spec_ref (value->data[0].v_pointer);
+
+ return NULL;
+}
+
+
+/* --- param spec pool --- */
+/**
+ * GParamSpecPool:
+ *
+ * A #GParamSpecPool maintains a collection of #GParamSpecs which can be
+ * quickly accessed by owner and name. The implementation of the #GObject property
+ * system uses such a pool to store the #GParamSpecs of the properties all object
+ * types.
+ */
+struct _GParamSpecPool
+{
+ GMutex mutex;
+ gboolean type_prefixing;
+ GHashTable *hash_table;
+};
+
static guint
-param_spec_hash (gconstpointer key_spec)
+param_spec_pool_hash (gconstpointer key_spec)
{
const GParamSpec *key = key_spec;
const gchar *p;
return h;
}
-static gint
-param_spec_equals (gconstpointer key_spec_1,
- gconstpointer key_spec_2)
+static gboolean
+param_spec_pool_equals (gconstpointer key_spec_1,
+ gconstpointer key_spec_2)
{
const GParamSpec *key1 = key_spec_1;
const GParamSpec *key2 = key_spec_2;
strcmp (key1->name, key2->name) == 0);
}
-GHashTable*
-g_param_spec_hash_table_new (void)
+/**
+ * g_param_spec_pool_new:
+ * @type_prefixing: Whether the pool will support type-prefixed property names.
+ *
+ * Creates a new #GParamSpecPool.
+ *
+ * If @type_prefixing is %TRUE, lookups in the newly created pool will
+ * allow to specify the owner as a colon-separated prefix of the
+ * property name, like "GtkContainer:border-width". This feature is
+ * deprecated, so you should always set @type_prefixing to %FALSE.
+ *
+ * Returns: (transfer none): a newly allocated #GParamSpecPool.
+ */
+GParamSpecPool*
+g_param_spec_pool_new (gboolean type_prefixing)
{
- return g_hash_table_new (param_spec_hash, param_spec_equals);
+ static GMutex init_mutex;
+ GParamSpecPool *pool = g_new (GParamSpecPool, 1);
+
+ memcpy (&pool->mutex, &init_mutex, sizeof (init_mutex));
+ pool->type_prefixing = type_prefixing != FALSE;
+ pool->hash_table = g_hash_table_new (param_spec_pool_hash, param_spec_pool_equals);
+
+ return pool;
}
+/**
+ * g_param_spec_pool_insert:
+ * @pool: a #GParamSpecPool.
+ * @pspec: the #GParamSpec to insert
+ * @owner_type: a #GType identifying the owner of @pspec
+ *
+ * Inserts a #GParamSpec in the pool.
+ */
void
-g_param_spec_hash_table_insert (GHashTable *hash_table,
- GParamSpec *pspec,
- GType owner_type)
+g_param_spec_pool_insert (GParamSpecPool *pool,
+ GParamSpec *pspec,
+ GType owner_type)
{
- g_return_if_fail (hash_table != NULL);
- g_return_if_fail (G_IS_PARAM_SPEC (pspec));
- g_return_if_fail (pspec->name != NULL);
- if (pspec->owner_type != owner_type)
- g_return_if_fail (pspec->owner_type == 0);
-
- if (strchr (pspec->name, ':'))
- g_warning (G_STRLOC ": parameter name `%s' contains field-delimeter",
- pspec->name);
- else
+ const gchar *p;
+
+ if (pool && pspec && owner_type > 0 && pspec->owner_type == 0)
{
+ for (p = pspec->name; *p; p++)
+ {
+ if (!strchr (G_CSET_A_2_Z G_CSET_a_2_z G_CSET_DIGITS "-_", *p))
+ {
+ g_warning (G_STRLOC ": pspec name \"%s\" contains invalid characters", pspec->name);
+ return;
+ }
+ }
+ g_mutex_lock (&pool->mutex);
pspec->owner_type = owner_type;
- g_hash_table_insert (hash_table, pspec, pspec);
+ g_param_spec_ref (pspec);
+ g_hash_table_insert (pool->hash_table, pspec, pspec);
+ g_mutex_unlock (&pool->mutex);
+ }
+ else
+ {
+ g_return_if_fail (pool != NULL);
+ g_return_if_fail (pspec);
+ g_return_if_fail (owner_type > 0);
+ g_return_if_fail (pspec->owner_type == 0);
}
}
+/**
+ * g_param_spec_pool_remove:
+ * @pool: a #GParamSpecPool
+ * @pspec: the #GParamSpec to remove
+ *
+ * Removes a #GParamSpec from the pool.
+ */
void
-g_param_spec_hash_table_remove (GHashTable *hash_table,
- GParamSpec *pspec)
+g_param_spec_pool_remove (GParamSpecPool *pool,
+ GParamSpec *pspec)
{
- g_return_if_fail (hash_table != NULL);
- g_return_if_fail (G_IS_PARAM_SPEC (pspec));
+ if (pool && pspec)
+ {
+ g_mutex_lock (&pool->mutex);
+ if (g_hash_table_remove (pool->hash_table, pspec))
+ g_param_spec_unref (pspec);
+ else
+ g_warning (G_STRLOC ": attempt to remove unknown pspec '%s' from pool", pspec->name);
+ g_mutex_unlock (&pool->mutex);
+ }
+ else
+ {
+ g_return_if_fail (pool != NULL);
+ g_return_if_fail (pspec);
+ }
+}
- g_assert (g_param_spec_hash_table_lookup (hash_table, pspec->name, pspec->owner_type, FALSE, NULL) != NULL); /* FIXME: paranoid */
+static inline GParamSpec*
+param_spec_ht_lookup (GHashTable *hash_table,
+ const gchar *param_name,
+ GType owner_type,
+ gboolean walk_ancestors)
+{
+ GParamSpec key, *pspec;
- g_hash_table_remove (hash_table, pspec);
- g_assert (g_param_spec_hash_table_lookup (hash_table, pspec->name, pspec->owner_type, FALSE, NULL) == NULL); /* FIXME: paranoid */
- pspec->owner_type = 0;
+ key.owner_type = owner_type;
+ key.name = (gchar*) param_name;
+ if (walk_ancestors)
+ do
+ {
+ pspec = g_hash_table_lookup (hash_table, &key);
+ if (pspec)
+ return pspec;
+ key.owner_type = g_type_parent (key.owner_type);
+ }
+ while (key.owner_type);
+ else
+ pspec = g_hash_table_lookup (hash_table, &key);
+
+ if (!pspec && !is_canonical (param_name))
+ {
+ gchar *canonical;
+
+ canonical = g_strdup (key.name);
+ canonicalize_key (canonical);
+
+ /* try canonicalized form */
+ key.name = canonical;
+ key.owner_type = owner_type;
+
+ if (walk_ancestors)
+ do
+ {
+ pspec = g_hash_table_lookup (hash_table, &key);
+ if (pspec)
+ {
+ g_free (canonical);
+ return pspec;
+ }
+ key.owner_type = g_type_parent (key.owner_type);
+ }
+ while (key.owner_type);
+ else
+ pspec = g_hash_table_lookup (hash_table, &key);
+
+ g_free (canonical);
+ }
+
+ return pspec;
}
+/**
+ * g_param_spec_pool_lookup:
+ * @pool: a #GParamSpecPool
+ * @param_name: the name to look for
+ * @owner_type: the owner to look for
+ * @walk_ancestors: If %TRUE, also try to find a #GParamSpec with @param_name
+ * owned by an ancestor of @owner_type.
+ *
+ * Looks up a #GParamSpec in the pool.
+ *
+ * Returns: (transfer none): The found #GParamSpec, or %NULL if no
+ * matching #GParamSpec was found.
+ */
GParamSpec*
-g_param_spec_hash_table_lookup (GHashTable *hash_table,
- const gchar *param_name,
- GType owner_type,
- gboolean try_ancestors,
- const gchar **trailer)
+g_param_spec_pool_lookup (GParamSpecPool *pool,
+ const gchar *param_name,
+ GType owner_type,
+ gboolean walk_ancestors)
{
GParamSpec *pspec;
- GParamSpec key;
gchar *delim;
-
- g_return_val_if_fail (hash_table != NULL, NULL);
+
+ g_return_val_if_fail (pool != NULL, NULL);
g_return_val_if_fail (param_name != NULL, NULL);
-
- key.owner_type = owner_type;
- delim = strchr (param_name, ':');
- if (delim)
- key.name = g_strndup (param_name, delim - param_name);
- else
- key.name = g_strdup (param_name);
- g_strcanon (key.name, G_CSET_A_2_Z G_CSET_a_2_z G_CSET_DIGITS "-", '-');
- if (trailer)
- *trailer = delim;
+ g_mutex_lock (&pool->mutex);
+
+ delim = pool->type_prefixing ? strchr (param_name, ':') : NULL;
+
+ /* try quick and away, i.e. without prefix */
+ if (!delim)
+ {
+ pspec = param_spec_ht_lookup (pool->hash_table, param_name, owner_type, walk_ancestors);
+ g_mutex_unlock (&pool->mutex);
+
+ return pspec;
+ }
+
+ /* strip type prefix */
+ if (pool->type_prefixing && delim[1] == ':')
+ {
+ guint l = delim - param_name;
+ gchar stack_buffer[32], *buffer = l < 32 ? stack_buffer : g_new (gchar, l + 1);
+ GType type;
+
+ strncpy (buffer, param_name, delim - param_name);
+ buffer[l] = 0;
+ type = g_type_from_name (buffer);
+ if (l >= 32)
+ g_free (buffer);
+ if (type) /* type==0 isn't a valid type pefix */
+ {
+ /* sanity check, these cases don't make a whole lot of sense */
+ if ((!walk_ancestors && type != owner_type) || !g_type_is_a (owner_type, type))
+ {
+ g_mutex_unlock (&pool->mutex);
+
+ return NULL;
+ }
+ owner_type = type;
+ param_name += l + 2;
+ pspec = param_spec_ht_lookup (pool->hash_table, param_name, owner_type, walk_ancestors);
+ g_mutex_unlock (&pool->mutex);
+
+ return pspec;
+ }
+ }
+ /* malformed param_name */
+
+ g_mutex_unlock (&pool->mutex);
+
+ return NULL;
+}
+
+static void
+pool_list (gpointer key,
+ gpointer value,
+ gpointer user_data)
+{
+ GParamSpec *pspec = value;
+ gpointer *data = user_data;
+ GType owner_type = (GType) data[1];
+
+ if (owner_type == pspec->owner_type)
+ data[0] = g_list_prepend (data[0], pspec);
+}
+
+/**
+ * g_param_spec_pool_list_owned:
+ * @pool: a #GParamSpecPool
+ * @owner_type: the owner to look for
+ *
+ * Gets an #GList of all #GParamSpecs owned by @owner_type in
+ * the pool.
+ *
+ * Returns: (transfer container) (element-type GObject.ParamSpec): a
+ * #GList of all #GParamSpecs owned by @owner_type in
+ * the pool#GParamSpecs.
+ */
+GList*
+g_param_spec_pool_list_owned (GParamSpecPool *pool,
+ GType owner_type)
+{
+ gpointer data[2];
+
+ g_return_val_if_fail (pool != NULL, NULL);
+ g_return_val_if_fail (owner_type > 0, NULL);
- pspec = g_hash_table_lookup (hash_table, &key);
- if (!pspec && try_ancestors)
+ g_mutex_lock (&pool->mutex);
+ data[0] = NULL;
+ data[1] = (gpointer) owner_type;
+ g_hash_table_foreach (pool->hash_table, pool_list, &data);
+ g_mutex_unlock (&pool->mutex);
+
+ return data[0];
+}
+
+static gint
+pspec_compare_id (gconstpointer a,
+ gconstpointer b)
+{
+ const GParamSpec *pspec1 = a, *pspec2 = b;
+
+ if (pspec1->param_id < pspec2->param_id)
+ return -1;
+
+ if (pspec1->param_id > pspec2->param_id)
+ return 1;
+
+ return strcmp (pspec1->name, pspec2->name);
+}
+
+static inline GSList*
+pspec_list_remove_overridden_and_redirected (GSList *plist,
+ GHashTable *ht,
+ GType owner_type,
+ guint *n_p)
+{
+ GSList *rlist = NULL;
+
+ while (plist)
+ {
+ GSList *tmp = plist->next;
+ GParamSpec *pspec = plist->data;
+ GParamSpec *found;
+ gboolean remove = FALSE;
+
+ /* Remove paramspecs that are redirected, and also paramspecs
+ * that have are overridden by non-redirected properties.
+ * The idea is to get the single paramspec for each name that
+ * best corresponds to what the application sees.
+ */
+ if (g_param_spec_get_redirect_target (pspec))
+ remove = TRUE;
+ else
+ {
+ found = param_spec_ht_lookup (ht, pspec->name, owner_type, TRUE);
+ if (found != pspec)
+ {
+ GParamSpec *redirect = g_param_spec_get_redirect_target (found);
+ if (redirect != pspec)
+ remove = TRUE;
+ }
+ }
+
+ if (remove)
+ {
+ g_slist_free_1 (plist);
+ }
+ else
+ {
+ plist->next = rlist;
+ rlist = plist;
+ *n_p += 1;
+ }
+ plist = tmp;
+ }
+ return rlist;
+}
+
+static void
+pool_depth_list (gpointer key,
+ gpointer value,
+ gpointer user_data)
+{
+ GParamSpec *pspec = value;
+ gpointer *data = user_data;
+ GSList **slists = data[0];
+ GType owner_type = (GType) data[1];
+
+ if (g_type_is_a (owner_type, pspec->owner_type))
{
- key.owner_type = g_type_parent (key.owner_type);
- while (key.owner_type)
+ if (G_TYPE_IS_INTERFACE (pspec->owner_type))
+ {
+ slists[0] = g_slist_prepend (slists[0], pspec);
+ }
+ else
{
- pspec = g_hash_table_lookup (hash_table, &key);
- if (pspec)
- break;
- key.owner_type = g_type_parent (key.owner_type);
+ guint d = g_type_depth (pspec->owner_type);
+
+ slists[d - 1] = g_slist_prepend (slists[d - 1], pspec);
}
}
+}
+
+/* We handle interfaces specially since we don't want to
+ * count interface prerequisites like normal inheritance;
+ * the property comes from the direct inheritance from
+ * the prerequisite class, not from the interface that
+ * prerequires it.
+ *
+ * also 'depth' isn't a meaningful concept for interface
+ * prerequites.
+ */
+static void
+pool_depth_list_for_interface (gpointer key,
+ gpointer value,
+ gpointer user_data)
+{
+ GParamSpec *pspec = value;
+ gpointer *data = user_data;
+ GSList **slists = data[0];
+ GType owner_type = (GType) data[1];
+
+ if (pspec->owner_type == owner_type)
+ slists[0] = g_slist_prepend (slists[0], pspec);
+}
+
+/**
+ * g_param_spec_pool_list:
+ * @pool: a #GParamSpecPool
+ * @owner_type: the owner to look for
+ * @n_pspecs_p: (out): return location for the length of the returned array
+ *
+ * Gets an array of all #GParamSpecs owned by @owner_type in
+ * the pool.
+ *
+ * Returns: (array length=n_pspecs_p) (transfer container): a newly
+ * allocated array containing pointers to all #GParamSpecs
+ * owned by @owner_type in the pool
+ */
+GParamSpec**
+g_param_spec_pool_list (GParamSpecPool *pool,
+ GType owner_type,
+ guint *n_pspecs_p)
+{
+ GParamSpec **pspecs, **p;
+ GSList **slists, *node;
+ gpointer data[2];
+ guint d, i;
+
+ g_return_val_if_fail (pool != NULL, NULL);
+ g_return_val_if_fail (owner_type > 0, NULL);
+ g_return_val_if_fail (n_pspecs_p != NULL, NULL);
- g_free (key.name);
+ g_mutex_lock (&pool->mutex);
+ *n_pspecs_p = 0;
+ d = g_type_depth (owner_type);
+ slists = g_new0 (GSList*, d);
+ data[0] = slists;
+ data[1] = (gpointer) owner_type;
+
+ g_hash_table_foreach (pool->hash_table,
+ G_TYPE_IS_INTERFACE (owner_type) ?
+ pool_depth_list_for_interface :
+ pool_depth_list,
+ &data);
- return pspec;
+ for (i = 0; i < d; i++)
+ slists[i] = pspec_list_remove_overridden_and_redirected (slists[i], pool->hash_table, owner_type, n_pspecs_p);
+ pspecs = g_new (GParamSpec*, *n_pspecs_p + 1);
+ p = pspecs;
+ for (i = 0; i < d; i++)
+ {
+ slists[i] = g_slist_sort (slists[i], pspec_compare_id);
+ for (node = slists[i]; node; node = node->next)
+ *p++ = node->data;
+ g_slist_free (slists[i]);
+ }
+ *p++ = NULL;
+ g_free (slists);
+ g_mutex_unlock (&pool->mutex);
+
+ return pspecs;
}
-/* --- auxillary functions --- */
+/* --- auxiliary functions --- */
typedef struct
{
/* class portion */
return memcmp (&value1->data, &value2->data, sizeof (value1->data));
}
+/**
+ * g_param_type_register_static:
+ * @name: 0-terminated string used as the name of the new #GParamSpec type.
+ * @pspec_info: The #GParamSpecTypeInfo for this #GParamSpec type.
+ *
+ * Registers @name as the name of a new static type derived from
+ * #G_TYPE_PARAM. The type system uses the information contained in
+ * the #GParamSpecTypeInfo structure pointed to by @info to manage the
+ * #GParamSpec type and its instances.
+ *
+ * Returns: The new type identifier.
+ */
GType
g_param_type_register_static (const gchar *name,
const GParamSpecTypeInfo *pspec_info)
return g_type_register_static (G_TYPE_PARAM, name, &info, 0);
}
+
+/**
+ * g_value_set_param:
+ * @value: a valid #GValue of type %G_TYPE_PARAM
+ * @param: (allow-none): the #GParamSpec to be set
+ *
+ * Set the contents of a %G_TYPE_PARAM #GValue to @param.
+ */
+void
+g_value_set_param (GValue *value,
+ GParamSpec *param)
+{
+ g_return_if_fail (G_VALUE_HOLDS_PARAM (value));
+ if (param)
+ g_return_if_fail (G_IS_PARAM_SPEC (param));
+
+ if (value->data[0].v_pointer)
+ g_param_spec_unref (value->data[0].v_pointer);
+ value->data[0].v_pointer = param;
+ if (value->data[0].v_pointer)
+ g_param_spec_ref (value->data[0].v_pointer);
+}
+
+/**
+ * g_value_set_param_take_ownership: (skip)
+ * @value: a valid #GValue of type %G_TYPE_PARAM
+ * @param: (allow-none): the #GParamSpec to be set
+ *
+ * This is an internal function introduced mainly for C marshallers.
+ *
+ * Deprecated: 2.4: Use g_value_take_param() instead.
+ */
+void
+g_value_set_param_take_ownership (GValue *value,
+ GParamSpec *param)
+{
+ g_value_take_param (value, param);
+}
+
+/**
+ * g_value_take_param: (skip)
+ * @value: a valid #GValue of type %G_TYPE_PARAM
+ * @param: (allow-none): the #GParamSpec to be set
+ *
+ * Sets the contents of a %G_TYPE_PARAM #GValue to @param and takes
+ * over the ownership of the callers reference to @param; the caller
+ * doesn't have to unref it any more.
+ *
+ * Since: 2.4
+ */
+void
+g_value_take_param (GValue *value,
+ GParamSpec *param)
+{
+ g_return_if_fail (G_VALUE_HOLDS_PARAM (value));
+ if (param)
+ g_return_if_fail (G_IS_PARAM_SPEC (param));
+
+ if (value->data[0].v_pointer)
+ g_param_spec_unref (value->data[0].v_pointer);
+ value->data[0].v_pointer = param; /* we take over the reference count */
+}
+
+/**
+ * g_value_get_param:
+ * @value: a valid #GValue whose type is derived from %G_TYPE_PARAM
+ *
+ * Get the contents of a %G_TYPE_PARAM #GValue.
+ *
+ * Returns: (transfer none): #GParamSpec content of @value
+ */
+GParamSpec*
+g_value_get_param (const GValue *value)
+{
+ g_return_val_if_fail (G_VALUE_HOLDS_PARAM (value), NULL);
+
+ return value->data[0].v_pointer;
+}
+
+/**
+ * g_value_dup_param: (skip)
+ * @value: a valid #GValue whose type is derived from %G_TYPE_PARAM
+ *
+ * Get the contents of a %G_TYPE_PARAM #GValue, increasing its
+ * reference count.
+ *
+ * Returns: #GParamSpec content of @value, should be unreferenced when
+ * no longer needed.
+ */
+GParamSpec*
+g_value_dup_param (const GValue *value)
+{
+ g_return_val_if_fail (G_VALUE_HOLDS_PARAM (value), NULL);
+
+ return value->data[0].v_pointer ? g_param_spec_ref (value->data[0].v_pointer) : NULL;
+}
+
+/**
+ * g_param_get_default_value:
+ * @param: a #GParamSpec
+ *
+ * Gets the default value of @param as a pointer to a #GValue.
+ *
+ * The #GValue will remain value for the life of @param.
+ *
+ * Returns: a pointer to a #GValue which must not be modified
+ *
+ * Since: 2.38
+ **/
+const GValue *
+g_param_spec_get_default_value (GParamSpec *pspec)
+{
+ GParamSpecPrivate *priv = g_param_spec_get_private (pspec);
+
+ /* We use the type field of the GValue as the key for the once because
+ * it will be zero before it is initialised and non-zero after. We
+ * have to take care that we don't write a non-zero value to the type
+ * field before we are completely done, however, because then another
+ * thread could come along and find the value partially-initialised.
+ *
+ * In order to accomplish this we store the default value in a
+ * stack-allocated GValue. We then set the type field in that value
+ * to zero and copy the contents into place. We then end by storing
+ * the type as the last step in order to ensure that we're completely
+ * done before a g_once_init_enter() could take the fast path in
+ * another thread.
+ */
+ if (g_once_init_enter (&priv->default_value.g_type))
+ {
+ GValue default_value = G_VALUE_INIT;
+
+ g_value_init (&default_value, pspec->value_type);
+ g_param_value_set_default (pspec, &default_value);
+
+ /* store all but the type */
+ default_value.g_type = 0;
+ priv->default_value = default_value;
+
+ g_once_init_leave (&priv->default_value.g_type, pspec->value_type);
+ }
+
+ return &priv->default_value;
+}
projects / platform / upstream / glib.git / blobdiff