[Issue 3377] [tdpl] static foreach should be implemented

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3377


downs <default_357-line at yahoo.de> changed:

           What    |Removed                     |Added
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                 CC|                            |default_357-line at yahoo.de


--- Comment #1 from downs <default_357-line at yahoo.de> 2009-10-08 12:35:53 PDT ---
This does compile (on 1.0):

template Repeat(T, int I) {
  static if (!I) alias Tuple!() Repeat;
  else alias Tuple!(T, Repeat!(T, I - 1)) Repeat;
}

double unrolledDotProduct(double[] a, double[] b) {
   const branches = 4;
   assert(a.length == b.length);
   double result = 0;
   auto n = (a.length / branches) * branches;
   double temp[branches];
   for (size_t i = 0; i != n; i += branches) {
      foreach (j, BOGUS; Repeat!(void, branches)) {
         temp[j] = a[i + j] * b[i + j];
      }
      result += inline_sum(temp);
   }
   foreach (j; n .. a.length) {
      result += a[j] * b[j];
   }
   return result;
}

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