Varargs Value Collection Converting varargs to generic values A union holding one collected value. 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. @value is 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 of @value. @__error: a #gchar** variable that will be modified to hold a g_new() allocated error messages if something fails Collects a value's variable argument locations from a va_list. @value: a #GValue return location. @value is 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 of @value. @__error: a #gchar** variable that will be modified to hold a g_new() allocated error messages if something fails The maximal number of #GTypeCValues which can be collected for a single #GValue.