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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>Generic values: GObject Reference Manual</title>
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<link rel="home" href="index.html" title="GObject Reference Manual">
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<link rel="up" href="rn01.html" title="API Reference">
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<link rel="prev" href="gobject-Boxed-Types.html" title="Boxed Types">
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<link rel="next" href="gobject-Standard-Parameter-and-Value-Types.html" title="Parameters and Values">
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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Top |
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Description
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Generic values
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Generic values — A polymorphic type that can hold values of any
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other type
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Functions
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#define
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G_VALUE_HOLDS()
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#define
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G_VALUE_TYPE()
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#define
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G_VALUE_TYPE_NAME()
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#define
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G_TYPE_IS_VALUE()
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#define
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G_TYPE_IS_VALUE_ABSTRACT()
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#define
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G_IS_VALUE()
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GValue *
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g_value_init ()
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void
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g_value_copy ()
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GValue *
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g_value_reset ()
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void
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g_value_unset ()
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void
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g_value_init_from_instance ()
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void
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g_value_set_instance ()
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gboolean
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g_value_fits_pointer ()
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gpointer
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g_value_peek_pointer ()
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gboolean
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g_value_type_compatible ()
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gboolean
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g_value_type_transformable ()
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gboolean
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g_value_transform ()
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void
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(*GValueTransform) ()
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void
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g_value_register_transform_func ()
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gchar *
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g_strdup_value_contents ()
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Types and Values
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#define
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G_VALUE_INIT
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GValue
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#define
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G_TYPE_VALUE
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#define
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G_TYPE_VALUE_ARRAY
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Includes
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#include <glib-object.h>
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Description
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The GValue structure is basically a variable container that consists
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of a type identifier and a specific value of that type.
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The type identifier within a GValue structure always determines the
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type of the associated value.
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To create a undefined GValue structure, simply create a zero-filled
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GValue structure. To initialize the GValue, use the g_value_init()
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function. A GValue cannot be used until it is initialized.
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The basic type operations (such as freeing and copying) are determined
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by the GTypeValueTable associated with the type ID stored in the GValue.
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Other GValue operations (such as converting values between types) are
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provided by this interface.
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The code in the example program below demonstrates GValue's
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features.
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#include <glib-object.h>
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static void
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int2string (const GValue *src_value,
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GValue *dest_value)
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{
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if (g_value_get_int (src_value) == 42)
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g_value_set_static_string (dest_value, "An important number");
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else
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g_value_set_static_string (dest_value, "What's that?");
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}
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int
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main (int argc,
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char *argv[])
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{
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GValue a = G_VALUE_INIT;
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GValue b = G_VALUE_INIT;
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const gchar *message;
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g_assert (!G_VALUE_HOLDS_STRING (&a));
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g_value_init (&a, G_TYPE_STRING);
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g_assert (G_VALUE_HOLDS_STRING (&a));
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g_value_set_static_string (&a, "Hello, world!");
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g_printf ("%s\n", g_value_get_string (&a));
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g_value_unset (&a);
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g_value_init (&a, G_TYPE_INT);
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g_value_set_int (&a, 42);
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g_value_init (&b, G_TYPE_STRING);
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g_assert (g_value_type_transformable (G_TYPE_INT, G_TYPE_STRING));
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g_value_transform (&a, &b);
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g_printf ("%s\n", g_value_get_string (&b));
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g_value_register_transform_func (G_TYPE_INT, G_TYPE_STRING, int2string);
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g_value_transform (&a, &b);
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g_printf ("%s\n", g_value_get_string (&b));
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return 0;
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}
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Functions
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G_VALUE_HOLDS()
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#define G_VALUE_HOLDS(value,type) (G_TYPE_CHECK_VALUE_TYPE ((value), (type)))
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Checks if value
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holds (or contains) a value of type
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.
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This macro will also check for value
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!= NULL and issue a
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warning if the check fails.
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Parameters
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value
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A GValue structure.
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type
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A GType value.
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Returns
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TRUE if value
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holds the type
|
|
Packit |
ae235b |
.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
G_VALUE_TYPE()
|
|
Packit |
ae235b |
#define G_VALUE_TYPE(value) (((GValue*) (value))->g_type)
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Get the type identifier of value
|
|
Packit |
ae235b |
.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Parameters
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
value
|
|
Packit |
ae235b |
A GValue structure.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Returns
|
|
Packit |
ae235b |
the GType.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
G_VALUE_TYPE_NAME()
|
|
Packit |
ae235b |
#define G_VALUE_TYPE_NAME(value) (g_type_name (G_VALUE_TYPE (value)))
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Gets the type name of value
|
|
Packit |
ae235b |
.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Parameters
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
value
|
|
Packit |
ae235b |
A GValue structure.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Returns
|
|
Packit |
ae235b |
the type name.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
G_TYPE_IS_VALUE()
|
|
Packit |
ae235b |
#define G_TYPE_IS_VALUE(type) (g_type_check_is_value_type (type))
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Checks whether the passed in type ID can be used for g_value_init().
|
|
Packit |
ae235b |
That is, this macro checks whether this type provides an implementation
|
|
Packit |
ae235b |
of the GTypeValueTable functions required for a type to create a GValue of.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Parameters
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
type
|
|
Packit |
ae235b |
A GType value.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Returns
|
|
Packit |
ae235b |
Whether type
|
|
Packit |
ae235b |
is suitable as a GValue type.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
G_TYPE_IS_VALUE_ABSTRACT()
|
|
Packit |
ae235b |
#define G_TYPE_IS_VALUE_ABSTRACT(type) (g_type_test_flags ((type), G_TYPE_FLAG_VALUE_ABSTRACT))
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Checks if type
|
|
Packit |
ae235b |
is an abstract value type. An abstract value type introduces
|
|
Packit |
ae235b |
a value table, but can't be used for g_value_init() and is normally used as
|
|
Packit |
ae235b |
an abstract base type for derived value types.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Parameters
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
type
|
|
Packit |
ae235b |
A GType value
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Returns
|
|
Packit |
ae235b |
TRUE on success
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
G_IS_VALUE()
|
|
Packit |
ae235b |
#define G_IS_VALUE(value) (G_TYPE_CHECK_VALUE (value))
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Checks if value
|
|
Packit |
ae235b |
is a valid and initialized GValue structure.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Parameters
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
value
|
|
Packit |
ae235b |
A GValue structure.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Returns
|
|
Packit |
ae235b |
TRUE on success.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
g_value_init ()
|
|
Packit |
ae235b |
GValue *
|
|
Packit |
ae235b |
g_value_init (GValue *value,
|
|
Packit |
ae235b |
GType g_type);
|
|
Packit |
ae235b |
Initializes value
|
|
Packit |
ae235b |
with the default value of type
|
|
Packit |
ae235b |
.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Parameters
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
value
|
|
Packit |
ae235b |
A zero-filled (uninitialized) GValue structure.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
g_type
|
|
Packit |
ae235b |
Type the GValue should hold values of.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Returns
|
|
Packit |
ae235b |
the GValue structure that has been passed in.
|
|
Packit |
ae235b |
[transfer none]
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
g_value_copy ()
|
|
Packit |
ae235b |
void
|
|
Packit |
ae235b |
g_value_copy (const GValue *src_value,
|
|
Packit |
ae235b |
GValue *dest_value);
|
|
Packit |
ae235b |
Copies the value of src_value
|
|
Packit |
ae235b |
into dest_value
|
|
Packit |
ae235b |
.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Parameters
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
src_value
|
|
Packit |
ae235b |
An initialized GValue structure.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
dest_value
|
|
Packit |
ae235b |
An initialized GValue structure of the same type as src_value
|
|
Packit |
ae235b |
.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
g_value_reset ()
|
|
Packit |
ae235b |
GValue *
|
|
Packit |
ae235b |
g_value_reset (GValue *value);
|
|
Packit |
ae235b |
Clears the current value in value
|
|
Packit |
ae235b |
and resets it to the default value
|
|
Packit |
ae235b |
(as if the value had just been initialized).
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Parameters
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
value
|
|
Packit |
ae235b |
An initialized GValue structure.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Returns
|
|
Packit |
ae235b |
the GValue structure that has been passed in
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
g_value_unset ()
|
|
Packit |
ae235b |
void
|
|
Packit |
ae235b |
g_value_unset (GValue *value);
|
|
Packit |
ae235b |
Clears the current value in value
|
|
Packit |
ae235b |
(if any) and "unsets" the type,
|
|
Packit |
ae235b |
this releases all resources associated with this GValue. An unset
|
|
Packit |
ae235b |
value is the same as an uninitialized (zero-filled) GValue
|
|
Packit |
ae235b |
structure.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Parameters
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
value
|
|
Packit |
ae235b |
An initialized GValue structure.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
g_value_init_from_instance ()
|
|
Packit |
ae235b |
void
|
|
Packit |
ae235b |
g_value_init_from_instance (GValue *value,
|
|
Packit |
ae235b |
gpointer instance);
|
|
Packit |
ae235b |
Initializes and sets value
|
|
Packit |
ae235b |
from an instantiatable type via the
|
|
Packit |
ae235b |
value_table's collect_value() function.
|
|
Packit |
ae235b |
Note: The value
|
|
Packit |
ae235b |
will be initialised with the exact type of
|
|
Packit |
ae235b |
instance
|
|
Packit |
ae235b |
. If you wish to set the value
|
|
Packit |
ae235b |
's type to a different GType
|
|
Packit |
ae235b |
(such as a parent class GType), you need to manually call
|
|
Packit |
ae235b |
g_value_init() and g_value_set_instance().
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Parameters
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
value
|
|
Packit |
ae235b |
An uninitialized GValue structure.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
instance
|
|
Packit |
ae235b |
the instance.
|
|
Packit |
ae235b |
[type GObject.TypeInstance]
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Since: 2.42
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
g_value_set_instance ()
|
|
Packit |
ae235b |
void
|
|
Packit |
ae235b |
g_value_set_instance (GValue *value,
|
|
Packit |
ae235b |
gpointer instance);
|
|
Packit |
ae235b |
Sets value
|
|
Packit |
ae235b |
from an instantiatable type via the
|
|
Packit |
ae235b |
value_table's collect_value() function.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Parameters
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
value
|
|
Packit |
ae235b |
An initialized GValue structure.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
instance
|
|
Packit |
ae235b |
the instance.
|
|
Packit |
ae235b |
[nullable]
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
g_value_fits_pointer ()
|
|
Packit |
ae235b |
gboolean
|
|
Packit |
ae235b |
g_value_fits_pointer (const GValue *value);
|
|
Packit |
ae235b |
Determines if value
|
|
Packit |
ae235b |
will fit inside the size of a pointer value.
|
|
Packit |
ae235b |
This is an internal function introduced mainly for C marshallers.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Parameters
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
value
|
|
Packit |
ae235b |
An initialized GValue structure.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Returns
|
|
Packit |
ae235b |
TRUE if value
|
|
Packit |
ae235b |
will fit inside a pointer value.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
g_value_peek_pointer ()
|
|
Packit |
ae235b |
gpointer
|
|
Packit |
ae235b |
g_value_peek_pointer (const GValue *value);
|
|
Packit |
ae235b |
Returns the value contents as pointer. This function asserts that
|
|
Packit |
ae235b |
g_value_fits_pointer() returned TRUE for the passed in value.
|
|
Packit |
ae235b |
This is an internal function introduced mainly for C marshallers.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Parameters
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
value
|
|
Packit |
ae235b |
An initialized GValue structure
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
Returns
|
|
Packit |
ae235b |
the value contents as pointer.
|
|
Packit |
ae235b |
[transfer none]
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
g_value_type_compatible ()
|
|
Packit |
ae235b |
gboolean
|
|
Packit |
ae235b |
g_value_type_compatible (GType src_type,
|
|
Packit |
ae235b |
GType dest_type);
|
|
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Returns whether a GValue of type src_type
|
|
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can be copied into
|
|
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ae235b |
a GValue of type dest_type
|
|
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.
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Parameters
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ae235b |
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ae235b |
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ae235b |
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ae235b |
src_type
|
|
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ae235b |
source type to be copied.
|
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ae235b |
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ae235b |
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ae235b |
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dest_type
|
|
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destination type for copying.
|
|
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ae235b |
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ae235b |
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ae235b |
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|
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Returns
|
|
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ae235b |
TRUE if g_value_copy() is possible with src_type
|
|
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ae235b |
and dest_type
|
|
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ae235b |
.
|
|
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ae235b |
|
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ae235b |
|
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ae235b |
|
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ae235b |
|
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ae235b |
g_value_type_transformable ()
|
|
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ae235b |
gboolean
|
|
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ae235b |
g_value_type_transformable (GType src_type,
|
|
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ae235b |
GType dest_type);
|
|
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ae235b |
Check whether g_value_transform() is able to transform values
|
|
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ae235b |
of type src_type
|
|
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ae235b |
into values of type dest_type
|
|
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. Note that for
|
|
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the types to be transformable, they must be compatible or a
|
|
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ae235b |
transformation function must be registered.
|
|
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ae235b |
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|
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ae235b |
Parameters
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|
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ae235b |
|
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ae235b |
|
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ae235b |
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ae235b |
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ae235b |
src_type
|
|
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ae235b |
Source type.
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
|
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dest_type
|
|
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Target type.
|
|
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|
|
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|
|
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ae235b |
|
|
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|
|
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|
|
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Returns
|
|
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ae235b |
TRUE if the transformation is possible, FALSE otherwise.
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
|
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|
|
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ae235b |
g_value_transform ()
|
|
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gboolean
|
|
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ae235b |
g_value_transform (const GValue *src_value,
|
|
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ae235b |
GValue *dest_value);
|
|
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Tries to cast the contents of src_value
|
|
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ae235b |
into a type appropriate
|
|
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ae235b |
to store in dest_value
|
|
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ae235b |
, e.g. to transform a G_TYPE_INT value
|
|
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ae235b |
into a G_TYPE_FLOAT value. Performing transformations between
|
|
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ae235b |
value types might incur precision lossage. Especially
|
|
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ae235b |
transformations into strings might reveal seemingly arbitrary
|
|
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ae235b |
results and shouldn't be relied upon for production code (such
|
|
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ae235b |
as rcfile value or object property serialization).
|
|
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ae235b |
|
|
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ae235b |
Parameters
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
src_value
|
|
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ae235b |
Source value.
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
|
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dest_value
|
|
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ae235b |
Target value.
|
|
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ae235b |
|
|
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ae235b |
|
|
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|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
Returns
|
|
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ae235b |
Whether a transformation rule was found and could be applied.
|
|
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ae235b |
Upon failing transformations, dest_value
|
|
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ae235b |
is left untouched.
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
GValueTransform ()
|
|
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void
|
|
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ae235b |
(*GValueTransform) (const GValue *src_value,
|
|
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ae235b |
GValue *dest_value);
|
|
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ae235b |
The type of value transformation functions which can be registered with
|
|
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ae235b |
g_value_register_transform_func().
|
|
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ae235b |
dest_value
|
|
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ae235b |
will be initialized to the correct destination type.
|
|
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ae235b |
|
|
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ae235b |
Parameters
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
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ae235b |
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
|
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src_value
|
|
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ae235b |
Source value.
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
dest_value
|
|
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ae235b |
Target value.
|
|
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|
|
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ae235b |
|
|
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|
|
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|
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|
|
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|
|
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ae235b |
|
|
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ae235b |
g_value_register_transform_func ()
|
|
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ae235b |
void
|
|
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ae235b |
g_value_register_transform_func (GType src_type,
|
|
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ae235b |
GType dest_type,
|
|
Packit |
ae235b |
GValueTransform transform_func);
|
|
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ae235b |
Registers a value transformation function for use in g_value_transform().
|
|
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ae235b |
A previously registered transformation function for src_type
|
|
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ae235b |
and dest_type
|
|
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ae235b |
|
|
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ae235b |
will be replaced.
|
|
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ae235b |
[skip]
|
|
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ae235b |
|
|
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ae235b |
Parameters
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
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ae235b |
|
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|
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ae235b |
|
|
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ae235b |
src_type
|
|
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ae235b |
Source type.
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
dest_type
|
|
Packit |
ae235b |
Target type.
|
|
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ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
transform_func
|
|
Packit |
ae235b |
a function which transforms values of type src_type
|
|
Packit |
ae235b |
into value of type dest_type
|
|
Packit |
ae235b |
|
|
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ae235b |
|
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ae235b |
|
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|
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ae235b |
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ae235b |
|
|
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|
|
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ae235b |
g_strdup_value_contents ()
|
|
Packit |
ae235b |
gchar *
|
|
Packit |
ae235b |
g_strdup_value_contents (const GValue *value);
|
|
Packit |
ae235b |
Return a newly allocated string, which describes the contents of a
|
|
Packit |
ae235b |
GValue. The main purpose of this function is to describe GValue
|
|
Packit |
ae235b |
contents for debugging output, the way in which the contents are
|
|
Packit |
ae235b |
described may change between different GLib versions.
|
|
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ae235b |
|
|
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ae235b |
Parameters
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
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ae235b |
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
value
|
|
Packit |
ae235b |
GValue which contents are to be described.
|
|
Packit |
ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
Returns
|
|
Packit |
ae235b |
Newly allocated string.
|
|
Packit |
ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
Types and Values
|
|
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ae235b |
|
|
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ae235b |
G_VALUE_INIT
|
|
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ae235b |
#define G_VALUE_INIT { 0, { { 0 } } }
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
A GValue must be initialized before it can be used. This macro can
|
|
Packit |
ae235b |
be used as initializer instead of an explicit { 0 } when declaring
|
|
Packit |
ae235b |
a variable, but it cannot be assigned to a variable.
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
1
|
|
Packit |
ae235b |
GValue value = G_VALUE_INIT;
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
|
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|
|
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ae235b |
|
|
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ae235b |
Since: 2.30
|
|
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ae235b |
|
|
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ae235b |
|
|
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ae235b |
|
|
Packit |
ae235b |
GValue
|
|
Packit |
ae235b |
typedef struct {
|
|
Packit |
ae235b |
} GValue;
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
An opaque structure used to hold different types of values.
|
|
Packit |
ae235b |
The data within the structure has protected scope: it is accessible only
|
|
Packit |
ae235b |
to functions within a GTypeValueTable structure, or implementations of
|
|
Packit |
ae235b |
the g_value_*() API. That is, code portions which implement new fundamental
|
|
Packit |
ae235b |
types.
|
|
Packit |
ae235b |
GValue users cannot make any assumptions about how data is stored
|
|
Packit |
ae235b |
within the 2 element data
|
|
Packit |
ae235b |
union, and the g_type
|
|
Packit |
ae235b |
member should
|
|
Packit |
ae235b |
only be accessed through the G_VALUE_TYPE() macro.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
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ae235b |
|
|
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ae235b |
G_TYPE_VALUE
|
|
Packit |
ae235b |
#define G_TYPE_VALUE (g_value_get_type ())
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
The type ID of the "GValue" type which is a boxed type,
|
|
Packit |
ae235b |
used to pass around pointers to GValues.
|
|
Packit |
ae235b |
|
|
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ae235b |
|
|
Packit |
ae235b |
|
|
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ae235b |
G_TYPE_VALUE_ARRAY
|
|
Packit |
ae235b |
#define G_TYPE_VALUE_ARRAY (g_value_array_get_type ())
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
G_TYPE_VALUE_ARRAY has been deprecated since version 2.32 and should not be used in newly-written code.
|
|
Packit |
ae235b |
Use GArray instead of GValueArray
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
The type ID of the "GValueArray" type which is a boxed type,
|
|
Packit |
ae235b |
used to pass around pointers to GValueArrays.
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
See Also
|
|
Packit |
ae235b |
The fundamental types which all support GValue
|
|
Packit |
ae235b |
operations and thus can be used as a type initializer for
|
|
Packit |
ae235b |
g_value_init() are defined by a separate interface. See the
|
|
Packit |
ae235b |
standard values API
|
|
Packit |
ae235b |
for details
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
Packit |
ae235b |
|
|
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ae235b |
Generated by GTK-Doc V1.27
|
|
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ae235b |
</body>
|
|
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ae235b |
</html>
|