Comments on: Toggle an Integer Between 1 and 0

By: root

root — Fri, 12 Mar 2010 10:03:35 +0000

bitwise operations like ^ tend to be significantly faster than other operations.

Pascal — Mon, 04 May 2009 10:11:31 +0000

If you’re using the int as a kind of flag…

BOOL is nothing else than a signed char, and YES is defined as 1 (NO is 0), you can even write:

static int x = 0;

// Toggles 1 to 0 and 0 to 1 using !
x = ! x;

john — Fri, 01 May 2009 19:22:40 +0000

Another way is this:

x = 1 – x;

If x is 1, it is now 0. If it was 0, it’s now 1. Pretty much the same thing as using XOR, but much simpler to understand.

seventoes — Tue, 28 Apr 2009 21:27:54 +0000

Same as using a bool and doing..

BOOL someBool = NO;

someBool = !someBool;

//someBool is now YES

Mike — Tue, 28 Apr 2009 21:25:05 +0000

Pretty handy to use this with the bitfields from a previous post of yours.

typedef struct {
unsigned preLoaded;
unsigned saveState;
unsigned saveLoginName;
} SomeStatus;

SomeStatus status;
status.preLoaded = 1;
status.saveState = 0;
status.saveLoginName = 1;

status.preLoaded ^= 1;

if( status.preLoaded == 0 )
NSLog(@”preloaded is off”);
else
NSLog(@”preloaded is on”);

if( status.saveState == 0 )
NSLog(@”saveState is off”);
else
NSLog(@”saveState is on”);

if( status.saveLoginName == 0 )
NSLog(@”saveLoginName is off”);
else
NSLog(@”saveLoginName is on”);