joiner and map, strange behavior

[Timon Gehr]

On 03/12/2013 06:51 PM, Stephan Schiffels wrote:
> ...
>
> Thanks, I had a brief look at std.algorithm.joiner but couldn't find
> anything obvious, maybe I should look deeper into it.
> ...

I guess it is because of the following:

Eg (similar code occurs two times):
...
     if (_sep.empty)
     {
         // Advance to the next range in the
         // input
         //_items.popFront();
         for (;; _items.popFront())
         {
             if (_items.empty) return;
             if (!_items.front.empty) break; // front called
         }
         _current = _items.front; // front called again
         _items.popFront();
     }
...

The code should only call front once for the first non-empty range.

Presumed example fix (though the implementation seems rather clumsy and 
should probably be replaced completely):

...
     if (_sep.empty)
     {
         // Advance to the next range in the
         // input
         //_items.popFront();
         for (;; _items.popFront())
         {
             if (_items.empty) return;
             _current = _items.front;
             if (!_current.empty) break;
         }
         _items.popFront();
     }
...