Can't add ubytes together to make a ubyte... bug or feature?

[Jonathan]

On Tuesday, 19 January 2016 at 23:36:14 UTC, Adam D. Ruppe wrote:
> On Tuesday, 19 January 2016 at 22:12:06 UTC, Soviet Friend 
> wrote:
>> I don't care if my computer needs to do math on a 4 byte 
>> basis, I'm not writing assembly.
>
> x86 actually doesn't need to do math that way, if you were 
> writing assembly, it would just work. This is just an annoying 
> rule brought over by C.
>
>> Can I prevent the initial implicit casts?
>
> Nope, though you can help tell the compiler that you want it to 
> fit there by doing stuff like
>
> ubyte a = 200;
> ubyte b = 100;
> ubyte c = (a+b)&0xff;
>
> or something like that, so the expression is specifically 
> proven to fit in the byte with compile time facts.


`(a+b)&0xff` What is this syntax?!  Could you give a link to this 
in the D documentation?  I am not even sure how to look it up...