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Showing content from https://cplusplus.com/cstdarg below:

header

<cstdarg> (stdarg.h)

Variable arguments handling

This 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:

First, va_start initializes the list of variable arguments as a va_list.
Subsequent executions of va_arg yield the values of the additional arguments in the same order as passed to the function.
Finally, va_end shall be executed before the function returns.

Types

va_list: Type to hold information about variable arguments (type)

Macro functions

va_start: Initialize a variable argument list (macro)

va_arg: Retrieve next argument (macro)

va_end: End using variable argument list (macro)

va_copy: Copy variable argument list (macro)

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