gcc/testsuite/gdc.test/runnable/imports/ice15200b.d

   1 module imports.ice15200b;
   2
   3 template filter(alias pred)
   4 {
   5     auto filter(R)(R range)
   6     {
   7         return FilterResult!(pred, R)(range);
   8     }
   9 }
  10
  11 struct FilterResult(alias pred, R)
  12 {
  13     R _input;
  14
  15     this(R r)
  16     {
  17         _input = r;
  18         while (_input.length && !pred(_input[0]))
  19         {
  20             _input = _input[1..$];
  21         }
  22     }
  23
  24     @property bool empty()
  25     {
  26         return _input.length == 0;
  27     }
  28
  29     @property auto ref front()
  30     {
  31         return _input[0];
  32     }
  33
  34     void popFront()
  35     {
  36         do
  37         {
  38             _input = _input[1..$];
  39         } while (_input.length && !pred(_input[0]));
  40     }
  41 }