Standard library header <cstdarg>

This header was originally in the C standard library as <stdarg.h>.

This header provides support for C-style variadic functions.

Types
va_list	holds the information needed by va_start, va_arg, va_end, and va_copy (typedef)
Macros
va_start	enables access to variadic function arguments (function macro)
va_arg	accesses the next variadic function argument (function macro)
va_copy (C++11)	makes a copy of the variadic function arguments (function macro)
va_end	ends traversal of the variadic function arguments (function macro)