Variable arguments handlingThis header defines macros to access the individual arguments of a list of unnamed arguments whose number and types are not known to the called function.
A function may accept a varying number of additional arguments without corresponding parameter declarations by including a comma and three dots (,...) after its regular named parameters:
return_type function_name ( parameter_declarations , ... );
To access these additional arguments the macros va_start, va_arg and va_end, declared in this header, can be used:
The header, describes one type:
And three functions:
Some implementations of C compilers (such as ISO C99-compliant compilers) also include a va_copy macro to duplicate a va_list object, but this is not part of ISO C++ standard.