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Bug 523939 – Example program for GValue
2008-08-22 Björn Lindqvist <bjourne@gmail.com> Bug 523939 – Example program for GValue * gobject/gvalue.c: Add code example that demonstrates GValue's features. svn path=/trunk/; revision=7387
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2008-08-22 Björn Lindqvist <bjourne@gmail.com>
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Bug 523939 – Example program for GValue
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* gobject/gvalue.c: Add code example that demonstrates GValue's
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features.
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2008-08-21 Tor Lillqvist <tml@novell.com>
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* glib/giowin32.c: Minor comment improvements. Improve run-time
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@ -53,6 +53,66 @@
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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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*
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* The code in the example program below demonstrates #GValue's
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* features.
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*
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* |[
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* #include <glib-object.h>
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*
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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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*
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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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* /* GValues must start zero-filled */
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* GValue a = {0};
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* GValue b = {0};
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* const gchar *message;
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*
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* g_type_init ();
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*
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* /* The GValue starts empty */
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* g_assert (!G_VALUE_HOLDS_STRING (&a));
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*
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* /* Put a string in it */
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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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*
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* /* Reset it to its pristine state */
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* g_value_unset (&a);
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*
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* /* It can then be reused for another type */
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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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*
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* /* Attempt to transform it into a GValue of type STRING */
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* g_value_init (&b, G_TYPE_STRING);
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*
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* /* An INT is transformable to a STRING */
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* g_assert (g_value_type_transformable (G_TYPE_INT, G_TYPE_STRING));
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*
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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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*
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* /* Attempt to transform it again using a custom transform function */
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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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* ]|
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*/
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