How to change DList elements by means of foreach?

[Alexandr Druzhinin]

10.09.2012 18:37, monarch_dodra пишет:
>
> There is a know bug: foreach with ref does not currently work these
> containers. The reason is that the container's front does not actually
> expose a reference, but a value, and that is what is being changed (the
> returned value).
>
> There is no hope in sight to really *ever* make it work, because
> "container.front += 5" can't be made to work if the returned value is
> not a reference: Unlike indexes that define opIndexOpAssign, there is no
> opFrontOpAssign.
>
> What bothers *me* though is that the code compiles fine, biting more
> than 1 user in the process.
>
> Anyways... the workaround is* making an explicit loop, with temporary
> object that is fed back into front, like this:
>
> import std.container;
>
> --------
> void main()
> {
>      // double-linked list;
>      DList!int dlist;
>      dlist.insertFront(0);
>      auto slice = dlist[]; //Extract a range manually
>      for( ; !slice.empty ; slice.popFront() )
>      {
>        auto value = slice.front; //Extract the value
>        value += 50;              //Increment the value
>        slice.front() = value;    //Feed back into the range*
>      }
>
>      foreach(value; dlist) {
>        assert(value == 50);  //Now this works fine
>      }
> }
> --------
>
> Well... this *would* work, but apparently, the implementation of
> DList.Range doesn't define front(T value). This makes the Range pretty
> much read-only. My guess is that this was an omission on the part of the
> implementer. I will fix it so that it works.
>
>
Good to know, but bad to do...

If in std.container:
1553:        @property T front() { return _first._payload; }
change to:
1553:        @property *ref* T front() { return _first._payload; }
doesn't it solve the problem or I don't know/understand something else?