|  |  |  | GObject Reference Manual |  | 
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| Varargs Value CollectionVarargs Value Collection — Converting varargs to generic values | 
#include <glib-object.h> #include <gobject/gvaluecollector.h> union GTypeCValue; #define G_VALUE_COLLECT (value, var_args, flags, __error) #define G_VALUE_LCOPY (value, var_args, flags, __error) #define G_VALUE_COLLECT_FORMAT_MAX_LENGTH
union GTypeCValue
{
  gint     v_int;
  glong    v_long;
  gint64   v_int64;
  gdouble  v_double;
  gpointer v_pointer;
};
A union holding one collected value.
#define G_VALUE_COLLECT(value, var_args, flags, __error)
Collects a variable argument value from a va_list. We have to implement the varargs collection as a macro, because on some systems va_list variables cannot be passed by reference.
| value: | a GValue return location. valueis supposed to be initialized 
  according to the value type to be collected | 
| var_args: | the va_list variable; it may be evaluated multiple times | 
| flags: | flags which are passed on to the collect_value()function of
  the GTypeValueTable ofvalue. | 
| __error: | a gchar** variable that will be modified to hold a g_new()allocated error messages if something fails | 
#define G_VALUE_LCOPY(value, var_args, flags, __error)
Collects a value's variable argument locations from a va_list.
| value: | a GValue return location. valueis supposed to be initialized 
  according to the value type to be collected | 
| var_args: | the va_list variable; it may be evaluated multiple times | 
| flags: | flags which are passed on to the lcopy_value()function of
  the GTypeValueTable ofvalue. | 
| __error: | a gchar** variable that will be modified to hold a g_new()allocated error messages if something fails | 
#define G_VALUE_COLLECT_FORMAT_MAX_LENGTH (8)
The maximal number of GTypeCValues which can be collected for a single GValue.
| << Parameters and Values | GParamSpec >> |