Re: Idea: swap with multiple arguments

[Era Scarecrow via Digitalmars-d]

On Tuesday, 24 May 2016 at 12:22:01 UTC, H. S. Teoh wrote:
And why would you assume that it would rotate right? The 
default assumption, unless stated clearly and widely followed 
everywhere, is unclear and leads to misunderstandings.

 hmmm rotate left would be a lot easier (and cleaner) to 
implement than rotate right..? And could include tail 
optimizations? If i consider a purely functional language where 
you have access to the left-side of the argument list but not the 
right side...

//Should probably heavily incorporate move as well...
//best if only bitwise-copies are necessary to swap/rotate values
void rotate(T...)(T[] arr) {
  T temp = arr[0];

  void inner(T[] vars) {
    if (arr.length > 1) {
      vars[0] = vars[1];
      inner(vars[1 .. $]);
    } else {
      vars[0] = temp;
    }
  }
  inner(arr);
}