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Boolean testing in Objective-C
Raw
main.m
// Links
// http://stackoverflow.com/a/20720173/202451
// http://blog.bignerdranch.com/564-bools-sharp-corners/
#import <Foundation/Foundation.h>
void assignObjectToBOOL()
{
NSLog(@"Starting %s", __PRETTY_FUNCTION__);
NSMutableSet *set = [NSMutableSet new];
int numberOfFails = 0;
int numberOfTries = 100;
for(int i = 0; i < numberOfTries; i++)
{
NSObject *obj = [NSObject new];
[set addObject:obj]; // just making sure same pointers aren't reused
BOOL objExists = obj;
if(objExists)
{
}
else
{
numberOfFails++;
NSLog(@"Failed with value %i", i);
}
}
NSLog(@"Total number of fails %i / %i. Failed for all objects with memory adress 0x.....00", numberOfFails, numberOfTries);
}
void ifCheckObject()
{
NSLog(@"Starting %s", __PRETTY_FUNCTION__);
NSMutableSet *set = [NSMutableSet new];
int numberOfFails = 0;
int numberOfTries = 1000;
for(int i = 0; i < numberOfTries; i++)
{
NSObject *obj = [NSObject new];
[set addObject:obj]; // just making sure same pointers aren't reused
if(obj)
{
}
else
{
numberOfFails++;
NSLog(@"Failed with value %i", i);
}
}
NSLog(@"Total number of fails %i / %i. Shouldn't fail for any objects.", numberOfFails, numberOfTries);
}
void assignPrimitiveToBOOL()
{
NSLog(@"Starting %s", __PRETTY_FUNCTION__);
int numberOfFails = 0;
int numberOfTries = 1000;
for(int i = -10; i < numberOfTries; i++)
{
BOOL valueIsTrue = i;
if(valueIsTrue)
{
}
else
{
numberOfFails++;
NSLog(@"Failed with value %i", i);
}
}
NSLog(@"Total number of fails %i / %i. Should fail for 0, 256, 512, 768 because their last two values is 0 (bitwise)", numberOfFails, numberOfTries);
}
void questionMarkOperatorOnObject()
{
NSLog(@"Starting %s", __PRETTY_FUNCTION__);
NSMutableSet *set = [NSMutableSet new];
int numberOfFails = 0;
int numberOfTries = 1000;
for(int i = 0; i < numberOfTries; i++)
{
NSObject *obj = [NSObject new];
[set addObject:obj]; // just making sure same pointers aren't reused
NSObject *newObj = obj ? : @"hello";
if(obj == newObj)
{
}
else
{
numberOfFails++;
NSLog(@"Failed with value %i", i);
}
}
NSLog(@"Total number of fails %i / %i. Shouldn't fail for any objects.", numberOfFails, numberOfTries);
}
void questionMarkOperatorOnPrimitive()
{
NSLog(@"Starting %s", __PRETTY_FUNCTION__);
int numberOfFails = 0;
int numberOfTries = 1000;
for(int i = -10; i < numberOfTries; i++)
{
int newValue = i ? : 40000;
if(newValue == i)
{
}
else
{
numberOfFails++;
NSLog(@"Failed with value %i", i);
}
}
NSLog(@"Total number of fails %i / %i. Should fail for primitive with value 0", numberOfFails, numberOfTries);
}
int main(int argc, char *argv[]) {
@autoreleasepool {
bool myBool = 2;
if (myBool != true) NSLog(@"myBool != true\n");
BOOL myBOOL = 2;
if (myBOOL != YES) NSLog(@"myBOOL != YES\n");
assignPrimitiveToBOOL();
assignObjectToBOOL();
ifCheckObject();
questionMarkOperatorOnObject();
questionMarkOperatorOnPrimitive();
}
}
void assignObjectToBOOL()
{
NSLog(@"Starting %s", __PRETTY_FUNCTION__);
NSMutableSet *set = [NSMutableSet new];
int numberOfFails = 0;
int numberOfTries = 100;
for(int i = 0; i < numberOfTries; i++)
{
NSObject *obj = [NSObject new];
[set addObject:obj]; // just making sure same pointers aren't reused
BOOL objExists = obj;
if(objExists)
{
}
else
{
numberOfFails++;
NSLog(@"Failed for object %p", obj);
}
}
NSLog(@"Total number of fails %i / %i. Failed for all objects with memory adress 0x.....00", numberOfFails, numberOfTries);
}
void ifCheckObject()
{
NSLog(@"Starting %s", __PRETTY_FUNCTION__);
NSMutableSet *set = [NSMutableSet new];
int numberOfFails = 0;
int numberOfTries = 1000;
for(int i = 0; i < numberOfTries; i++)
{
NSObject *obj = [NSObject new];
[set addObject:obj]; // just making sure same pointers aren't reused
if(obj)
{
}
else
{
numberOfFails++;
NSLog(@"Does NOT exist %@", obj);
}
}
NSLog(@"Total number of fails %i / %i. Shouldn't fail for any objects.", numberOfFails, numberOfTries);
}
void assignPrimitiveToBOOL()
{
NSLog(@"Starting %s", __PRETTY_FUNCTION__);
int numberOfFails = 0;
int numberOfTries = 1000;
for(int i = -10; i < numberOfTries; i++)
{
BOOL valueIsTrue = i;
if(valueIsTrue)
{
}
else
{
numberOfFails++;
NSLog(@"Failed with value %i", i);
}
}
NSLog(@"Total number of fails %i / %i. Should fail for 0, 256, 512, 768 because their last two values is 0 (bitwise)", numberOfFails, numberOfTries);
}
void questionMarkOperatorOnObject()
{
NSLog(@"Starting %s", __PRETTY_FUNCTION__);
NSMutableSet *set = [NSMutableSet new];
int numberOfFails = 0;
int numberOfTries = 1000;
for(int i = 0; i < numberOfTries; i++)
{
NSObject *obj = [NSObject new];
[set addObject:obj]; // just making sure same pointers aren't reused
NSObject *newObj = obj ? : @"hello";
if(obj == newObj)
{
}
else
{
numberOfFails++;
NSLog(@"Does NOT exist %@", obj);
}
}
NSLog(@"Total number of fails %i / %i. Shouldn't fail for any objects.", numberOfFails, numberOfTries);
}
void questionMarkOperatorOnPrimitive()
{
NSLog(@"Starting %s", __PRETTY_FUNCTION__);
int numberOfFails = 0;
int numberOfTries = 1000;
for(int i = -10; i < numberOfTries; i++)
{
int newValue = i ? : 40000;
if(newValue == i)
{
}
else
{
numberOfFails++;
NSLog(@"Failed with value %i", i);
}
}
NSLog(@"Total number of fails %i / %i. Should fail for primitive with value 0", numberOfFails, numberOfTries);
}
int main(int argc, char *argv[]) {
@autoreleasepool {
bool myBool = 2;
if (myBool != true) NSLog(@"myBool != true\n");
BOOL myBOOL = 2;
if (myBOOL != YES) NSLog(@"myBOOL != YES\n");
assignPrimitiveToBOOL();
assignObjectToBOOL();
ifCheckObject();
questionMarkOperatorOnObject();
questionMarkOperatorOnPrimitive();
}
}
Raw
Output
Untitled.m:13:11: warning: incompatible pointer to integer conversion initializing 'BOOL' (aka 'signed char') with an expression of type 'NSObject *' [-Wint-conversion]
BOOL objExists = obj;
^ ~~~
1 warning generated.
2014-02-18 09:44:10.739 Untitled[46411:507] myBOOL != YES
2014-02-18 09:44:10.741 Untitled[46411:507] Starting void assignPrimitiveToBOOL()
2014-02-18 09:44:10.741 Untitled[46411:507] Failed with value 0
2014-02-18 09:44:10.741 Untitled[46411:507] Failed with value 256
2014-02-18 09:44:10.741 Untitled[46411:507] Failed with value 512
2014-02-18 09:44:10.742 Untitled[46411:507] Failed with value 768
2014-02-18 09:44:10.742 Untitled[46411:507] Total number of fails 4 / 1000. Should fail for 0, 256, 512, 768 because their last two values is 0 (bitwise)
2014-02-18 09:44:10.742 Untitled[46411:507] Starting void assignObjectToBOOL()
2014-02-18 09:44:10.743 Untitled[46411:507] Failed for object 0x7f840a501d00
2014-02-18 09:44:10.743 Untitled[46411:507] Failed for object 0x7f840a501b00
2014-02-18 09:44:10.743 Untitled[46411:507] Failed for object 0x7f840c800000
2014-02-18 09:44:10.743 Untitled[46411:507] Failed for object 0x7f840c800300
2014-02-18 09:44:10.744 Untitled[46411:507] Failed for object 0x7f840c800700
2014-02-18 09:44:10.744 Untitled[46411:507] Failed for object 0x7f840a501c00
2014-02-18 09:44:10.744 Untitled[46411:507] Failed for object 0x7f840a501e00
2014-02-18 09:44:10.745 Untitled[46411:507] Failed for object 0x7f840c800200
2014-02-18 09:44:10.745 Untitled[46411:507] Total number of fails 8 / 100. Failed for all objects with memory adress 0x.....00
2014-02-18 09:44:10.745 Untitled[46411:507] Starting void ifCheckObject()
2014-02-18 09:44:10.746 Untitled[46411:507] Total number of fails 0 / 1000. Shouldn't fail for any objects.
2014-02-18 09:44:10.746 Untitled[46411:507] Starting void questionMarkOperatorOnObject()
2014-02-18 09:44:10.746 Untitled[46411:507] Total number of fails 0 / 1000. Shouldn't fail for any objects.
2014-02-18 09:44:10.746 Untitled[46411:507] Starting void questionMarkOperatorOnPrimitive()
2014-02-18 09:44:10.747 Untitled[46411:507] Failed with value 0
2014-02-18 09:44:10.747 Untitled[46411:507] Total number of fails 1 / 1000. Should fail for primitive with value 0
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