keyword: and

12-17-2006, 06:30 PM	#1
Themerion	I have a short question. Let's say that I have an if-statement containing and. Will Warcraft stop evaluating the if-statement if it discovers that the first condition is false? Or will it in some cases save processing time to use nestled ifs rather than ands? JASS: // Will FunctionC be evaluated too? if(false and FunctionC()) then

12-17-2006, 06:41 PM	#2
Jacek	erm if (3<2 and 3>4) will also work >_> AND is if two conditions are same, not if they are both true

12-17-2006, 06:48 PM

masda70

The following expression:

JASS:

(false and false)

doesn't return true.

I think he is asking something more like this:
Once the first operand of an AND operator expression is false, it stops evaluating the next operands included in that expression.

JASS:

function Test takes nothing returns boolean
 call BJDebugMsg("TEST!")
 return true
endfunction

function RunTest takes nothing returns nothing
if (false and Test()) then
endif
endfunction

'Test' is never evaluated, since after calling RunTest the "TEST!" message is never displayed.

12-17-2006, 06:59 PM	#4
Themerion	Thanks masda70!

12-17-2006, 09:34 PM	#5
blu_da_noob	This is a feature called Short Circuit Boolean Evaluation (or some such) and is useful when certain functions have major problems with incorrect input, eg: if somestring != "" and HaveStoredInteger(cache,"lol",somestring) then //gamecache functions crash if they get an empty string