Re: for_UP_and_DOWN

[Graham Percival]

On Sat, Apr 14, 2012 at 04:10:50PM +0200, Łukasz Czerwiński wrote:
> I've uploaded my patch without for_UP_and_DOWN, but now it's time to talk
> about this #define. I'd like to make a second patch that will introduce
> that, but there was no consensus.

ok, great!

> If you don't know, what I am talking about, take a quick look at:
> http://codereview.appspot.com/5975054/diff/1/flower/include/direction.hh 
> (lines
> 75-90).

tldr summary: we use these for direction loops:

for (UP_and_DOWN(d))
   { ... }
for (LEFT_and_RIGHT(d))
   { ... }


- Graham