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Showing content from https://en.cppreference.com/w/cpp/language/../utility/variadic/va_list.html below:

std::va_list - cppreference.com

typedef /* unspecified */ va_list;

va_list is a complete object type (in practice, a unique built-in type or char*) suitable for holding the information needed by the macros va_start, va_copy, va_arg, and va_end.

If a va_list instance is created, passed to another function, and used via va_arg in that function, then any subsequent use in the calling function should be preceded by a call to va_end.

It is legal to pass a pointer to a va_list object to another function and then use that object after the function returns.

[edit] Example [edit] See also enables access to variadic function arguments
(function macro) [edit] makes a copy of the variadic function arguments
(function macro) [edit] accesses the next variadic function argument
(function macro) [edit] ends traversal of the variadic function arguments
(function macro) [edit]

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