BitArray - Is there one?

[Era Scarecrow]

On Tuesday, 29 May 2012 at 06:30:37 UTC, Dmitry Olshansky wrote:
> You surely haven't looked at the source code did you? :)
> It's conceptualy non per bit '-', it's a set difference...

  I recall looking at it, but to me that just didn't make sense. I 
could add subtract back and update it (Not many changes needed to 
keep it).

> Not at all. Once you established that it's not a pointer namely 
> since every pointer to size_t is word aligned (unless 
> constructed by hand).

> You could use it's lowest bit as marker then. It's 0 state 
> won't disturb pointer usual semantics, when it's set to 1 it's 
> obviously.

  I considered that, but then you actually limit your address 
space to 2^63, true that seems silly up until in the future when 
we use all 64bits for memory referencing and suddenly it's seg 
faulting for no understandable reason (Yes it's a long ways off, 
but this will long be forgotten about by that time). However 
referring to the internal offsets it only effects slices; and 
those are easy to fix.

  This will likely take a little time to think over and get 
working, I'd hate to have to make alternate versions of 
everything.

>> I don't see BitArray as a good replacement for the C flags. 
>> However I already made (and suggested) a flags struct that 
>> accepts and uses enums for it's flags.

> Cool. Eager to see that on the way to Phobos too.

  We'll see, once I sorta figure this all out.