Re: The rfind challenge

[Andrei Alexandrescu]

On 1/15/13 1:31 AM, H. S. Teoh wrote:
Hmm. What about introducing a new primitive takeUntil, that returns the
initial segment of the range until a given predicate becomes true? Then
you could implement rfind thus:
        auto rfind(alias pred, R)(R range)
                if (isBidirectionalRange!R)
        {
                return range.retro()
                        .takeUntil!pred()
                        .retro();
        }

That works, but returns a different type. Ideally rfind would return the 
same type as the initial range, R.

Andrei