"n" is not a variable in your example. It's still just syntactic sugar for templates, where the n needs to be known statically. Even without the "resizable" bit

"n" is not a variable in your example. It's still just syntactic sugar for templates, where the n needs to be known statically. Even without the "resizable" bit, you still limit this function to operating on arrays of sizes known statically, which is a severe limitation, making the whole thing impractical.