Calling derived class methods from the base class. What do you think this code outputs.

BaseDerivedClassMethods

#import <Foundation/Foundation.h>

@interface BaseClass : NSObject
+(void)callDerivedClassMethod;
@end

@interface DerivedClass : BaseClass
+(void)derivedClassMethod;
@end

@implementation BaseClass
+(void)callDerivedClassMethod
{
    SEL theSelector = NSSelectorFromString(@"derivedClassMethod");
    if (theSelector)
    {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
        [self performSelector:theSelector];
#pragma clang diagnostic pop
    }
    else
    {
        NSLog(@"Didn't call derivedClassMethod.");
    }
}
@end

@implementation DerivedClass
+(void)derivedClassMethod
{
    NSLog(@"derivedClassMethod has been called.");
}
@end

int main(int argc, const char * argv[])
{
    @autoreleasepool
    {
        [DerivedClass callDerivedClassMethod];
    }
    return 0;
}