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GTK+ Reference Manual | ![]() |
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Top | Description |
#include <gtk/gtk.h> gboolean (*GtkFunction) (gpointer data
); void (*GtkCallbackMarshal) (GtkObject *object
,gpointer data
,guint n_args
,GtkArg *args
); GtkArg;
The GTK+ type system is extensible. Because of that, types have to be managed at runtime.
void (*GtkCallbackMarshal) (GtkObject *object
,gpointer data
,guint n_args
,GtkArg *args
);
Defines a function pointer.
typedef struct { GType type; gchar *name; /* this union only defines the required storage types for * the possibile values, thus there is no gint enum_data field, * because that would just be a mere alias for gint int_data. * use the GTK_VALUE_*() and GTK_RETLOC_*() macros to access * the discrete memebers. */ union { /* flat values */ gchar char_data; guchar uchar_data; gboolean bool_data; gint int_data; guint uint_data; glong long_data; gulong ulong_data; gfloat float_data; gdouble double_data; gchar *string_data; GtkObject *object_data; gpointer pointer_data; /* structured values */ struct { GCallback f; gpointer d; } signal_data; } d; } GtkArg;
This is a structure that we use to pass in typed values (and names).