symmetric signed types

[Ola Fosheim Grøstad" <ola.fosheim.grostad+dlang at gmail.com>]

On Saturday, 25 January 2014 at 17:15:56 UTC, Ola Fosheim Grøstad 
wrote:
> Fortunately most CPUS have ones-complement so the result is

Err... "Two's complement." Nngh! Anyway, the basic idea is to 
think of minus for unsigned integers as ~x + 1, not as a 
operation using negative integers. Then it makes sense.