Comparing two BOOL values

Question

In my instance method, would like to compare a BOOL parameter with the content of a static variable, for instance:

- (NSArray*)myMethod:(NSString*)someString actualValuesOnly:(BOOL)actualValuesOnly {
static NSString *prevSsomeString;
static BOOL prevActualValuesOnly;
static NSArray *prevResults

if ([someString isEqualToString:prevSomeString] && 
              ([actualValuesOnly isEqual: prevActualValuesOnly]) 
               // HOW TO COMPARE THESE TWO BOOLEANS CORRECTLY?? 
    { return prevResults; }// parameters have not changed, return previous results 
else { } // do calculations and store parameters and results for future comparisons)

What would be the correct way to do this?

score 5 · Accepted Answer · answered Oct 26 '12 at 07:55

5

Since BOOL is a primitive (or scalar) type, and not a class, you can compare it directly with ==

if ([someString isEqualToString:prevSomeString] && actualValuesOnly == prevActualValuesOnly)

answered Oct 26 '12 at 07:55

Matthias Bauch

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Hi Matthias, thanks for your answer. I thought `BOOL`s are stored as `NSNumber` objects. Wouldn't `==` just compare their pointers and not their actual values? – AlexR Oct 26 '12 at 08:00
BOOL is a primitive type like for example int or float. Compare it directly. http://developer.apple.com/library/ios/#documentation/cocoa/conceptual/ProgrammingWithObjectiveC/FoundationTypesandCollections/FoundationTypesandCollections.html – Matthias Bauch Oct 26 '12 at 08:02

score 3 · Answer 2 · answered Oct 30 '12 at 08:43

3

Boolean variable is compare with == sign instead of isEqual

if(Bool1 == Bool2){

    // do something here}

answered Oct 30 '12 at 08:43

ca android

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score 1 · Answer 3 · answered Oct 26 '12 at 08:42

1

Boolean is compare with == sign instead of isequal:

answered Oct 26 '12 at 08:42

Arvind Kanjariya

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score 1 · Answer 4 · edited May 23 '17 at 11:53

1

The solutions mentioned here are not the safest way to compare 2 BOOL values, because a BOOL is really just an integer, so they can contain more than just YES/NO values. The best way is to XOR them together, like detailed here: https://stackoverflow.com/a/11135879/1026573

edited May 23 '17 at 11:53

Community

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answered Mar 11 '15 at 19:41

James Kuang

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Evol Gate · Answer 5 · 2013-12-11T08:40:02.500

0

As Matthias Bauch suggests,

Simply do the comparison using == operator i.e

if (BOOL1 == BOOL2)   
{   
    //enter code here
}

edited Dec 11 '13 at 08:40

answered Oct 26 '12 at 08:44

Evol Gate

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Comparing two BOOL values

5 Answers5