Generic invert function?

[Jonathan M Davis]

On 2011-06-30 18:27, Andrej Mitrovic wrote:
> So I thought this would be in Phobos, basically I want to reverse the
> "polarity" of a value in a range.
> 
> What I mean is if I have a possible range of 0 .. 127, then the values
> of the left would equal the inverted values on the right:
> 
> 0 -> 127
> 10 -> 117
> 20 -> 107
> 50 -> 77
> 77 -> 50
> 
> and so on.. Quite easy to do, is it common enough to be in Phobos though?

std.range.retro?

- Jonathan M Davis