In case of using variable arguments in cpp, what does va_arg return as the next value in case there is no next value?
Also, can this be considered as a solution for counting the elements in va_list?
What is the return value of va_arg in empty lists?
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It's Undefined Behavior to do this, so you can't say anything about it. It's certainly unsuitable for counting.
Use variadic templates instead, those allow you to count arguments.