Why use variadic arguments now when initializer lists are available?

Question

I\'ve been wondering what are the advantages of variadic arguments over initializer lists. Both offer the same ability - to pass indefinite number of arguments to a function

Answer 1

Briefly, C-style variadic functions produce less code when compiled than C++-style variadic templates, so if you're concerned about binary size or instruction cache pressure, you should consider implementing your functionality with varargs instead of as a template.

However, variadic templates are significantly safer and produce far more usable error messages, so you'll often want to wrap your out-of-line variadic function with an inline variadic template, and have users call the template.