llGetInventoryPermMask operators

if( llGetInventoryPermMask(tmpitem, MASK_OWNER) & PERM_COPY )

This tells you if copy is enabled.

What if, tho, want to see if copy is *NOT* enabled.

I know more wordy ways of doing it,and that's what I use, but is there a direct syntax for & NOT PERM_COPY?

None of the wikis appear to cover that.

I'll let someone chime in on this, but I believe you use the tilde...

if(~llGetInventoryPermMask(tmpitem, MASK_OWNER) & PERM_COPY )

true
"~" turns all "1" of that integer bitfield into "0" and the other way around, asd it is the NOT operator.

Many thanks. I'll add to offiicial wiki.

Or there's always:

if (llGetInventoryPermMask(tmpitem, MASK_OWNER) & PERM_COPY == 0)

I beg to differ on your terminology

"!" is the not operator and 1becomes 0, 0 becomes 1.
"~" is the 1's Compliment operator where a -1 becomes 0 and 0 becomes -1.

Your code will work, it is just the terminology I question.

I beg to differ on your terminology

"!" is the NOT operator as 1 becomes 0, 0 becomes 1.
"~" is the 1's Compliment operator where a -1 becomes 0 and 0 becomes -1.

test code:

default
{
	state_entry()
	{
		llListen(0,"","","");
	}
	touch_start(integer total_number)
	{
		integer x;
		llOwnerSay("with ~ "+(string)(x = 0)+" becomes "+(string)~x);
		llOwnerSay("with ~ "+(string)(x = 1)+" becomes "+(string)~x);
		llOwnerSay("with ~ "+(string)(x = -1)+" becomes "+(string)~x);
		llOwnerSay("with ~ "+(string)(x = -2)+" becomes "+(string)~x);
		llOwnerSay("with ! "+(string)(x = 0)+" becomes "+(string)!x);
		llOwnerSay("with ! "+(string)(x = 1)+" becomes "+(string)!x);
		llOwnerSay("with ! "+(string)(x = -1)+" becomes "+(string)!x);
		llOwnerSay("with ! "+(string)(x = -2)+" becomes "+(string)!x);
	}
}

result:
new: with ~ 0 becomes -1
new: with ~ 1 becomes -2
new: with ~ -1 becomes 0
new: with ~ -2 becomes 1
new: with ! 0 becomes 1
new: with ! 1 becomes 0
new: with ! -1 becomes 0
new: with ! -2 becomes 0


As LSL treats any non zero value as TRUE and ~1 returns -2 then both 1 and -2 are TRUE therefore"~" is not equivalent to a NOT operator, whilst !-2 returns 0 so "!" is a valid NOT operator in all cases.

Your code will work in this instance, it is just the terminology I question.

The Correct answer would be

if( ! llGetInventoryPermMask(tmpitem, MASK_OWNER) & PERM_COPY )

No, this really isn't the correct answer. The correct answer IS to use the bitwise tilde operator not the boolean not operator.

Edit(added): This is owing to operator precedence.

In your solution, I think that you think you are saying:
if ( !(llGetInventoryPermMask(tmpitem, MASK_OWNER) & PERM_COPY))...

when you are actually saying:
if ( !(llGetInventoryPermMask(tmpitem, MASK_OWNER)) & PERM_COPY)...

OOps, Correct, I left out the Brackets. The point I was actual trying to make is that ~ is not equivalent to NOT, but my final example rather defeated it *blush*