Variable number of arguments in C++?

Question

How can I write a function that accepts a variable number of arguments? Is this possible, how?

Answer 1

// spawn: allocate and initialize (a simple function)
template
T * spawn(size_t n, ...){
  T * arr = new T[n];
  va_list ap;
  va_start(ap, n);
  for (size_t i = 0; i < n; i++)
    T[i] = va_arg(ap,T);
  return arr;
}

User writes:

auto arr = spawn (3, 0.1,0.2,0.3);

Semantically, this looks and feels exactly like an n-argument function. Under the hood, you might unpack it one way or the other.