Detecting multiple values in a bitflag

[jake13jake]

Is there any other way to test for multiple values in a bitflag other than iterating through it?

[Rick]

if (flags & (flag1 | flag2))

[jake13jake]

Originally Posted by Rick

if (flags & (flag1 | flag2))

uhhhhhhh... not really what I meant.
you could have
100000000000000000000000000000001
or
000000000000000010000000000000000

I mean, of course I would know the range of this flag. it certainly wouldn't take all 32 places.

What would be the best way to detect if there is more than one value stored in it though?

for (i=0; i<flagsize; i++) {
if (flag & 2^i)
this.flagcounter++;
if (this.flagcounter == 2)
return true;
}
return false;

[Rick]

First of all, Graal doesn't support above 32bits for numbers (I think).
Second, what I said was correct

if (flags & (0x100000001 | 0x10000))

[edit]

We had a discussion about this on IRC and we came to that I misunderstood your original question, mostly because your original question was not written very well.

Anyway, my point of view: you're using bitflags for the wrong reason.

But uhh, here's how I would do it:

PHP Code:

function getFlagCount(flags)
{
  temp.count = 0;
  while (temp.flags > 0)
  {
    temp.count += temp.flags & 1;
    temp.flags >>= 1;
  }
  return temp.count;
} 


[jake13jake]

I'm using bit flags to conserve variable space actually.

[Admins]

You need to loop through all bits you want to check, there is no countbits() function or so yet

[jake13jake]

ok