On 4/24/2016 8:33 AM, Andrei Alexandrescu wrote:
On 04/24/2016 02:57 AM, deadalnix wrote:
On Saturday, 23 April 2016 at 15:29:08 UTC, Andrei Alexandrescu wrote:
Yah, that's the canonical. I forgot why I chose (x & -x) > (x - 1)
over it.
I'm not sure why do you test against x - 1 when you could test for
equality. Not only it looks like it is going to require an extra
computation (x - 1) but also it doesn't work for 0.
So if you do (x & -x) == x that returns 1 for x == 0. For many applications you
want to yield 0. So you test for (x & -x) > (x - 1) such that for x == 0 the
right hand side is a large number. -- Andrei
This sort of stuff should go on wiki.dlang.org page!
