C++ In a Nutshell

Name

va_arg macro — Gets next argument

Synopsis

T va_arg(va_list ap, T)

The va_arg macro fetches the next argument, which must be of type T. The ap parameter must have been initialized by calling va_start. The type T must be a type that results from the standard type promotions (Chapter 3) or else the behavior is undefined. For example, T cannot be char, but must be int because the standard promotion of type char is to type int (or, in rare circumstances, unsigned int). The behavior is undefined if there is no next argument.