Re: Error: array operation d1[] + d2[] without assignment not implemented

[Ilya Yaroshenko via Digitalmars-d-learn]

On Saturday, 13 September 2014 at 14:18:57 UTC, deed wrote:

struct Vector (T)
{
  T[]arr;
  void opSliceAssign (T[] a) { arr[] = a[]; }
}
unittest
{
  auto v = Vector!double([1, 2]);
  double[] d1 = [11, 12];
  double[] d2 = [21, 22];
  double[] d3 = new double[](2);
  d3[] = d1[] + d2[];
  assert (d3 == [11.+21., 12.+22.]);
  assert (is(typeof(d1[] + d2[]) == double[]));
  v[] = d1[]          // Fine

v[] = d1[] + d2[]; // Error: array operation d1[] + d2[] without assignment not implemented

}

How can opSliceAssign be defined to make this work?

Hi!

struct Vector (T)
{
        T[]arr;
        T[] opSlice() { return arr; }
}
Vector!double v;
double[] d;
v[][] = d[] + d[];

//first [] call opSlise, second [] for array syntax

Best Regards,
Ilya