Always remember what a BOOL is

gistfile1.txt

#import <Foundation/Foundation.h>

typedef NS_ENUM(NSUInteger, MyEnum) {
  MyEnumA = 1 << 0,
	MyEnumB = 1 << 1,
	MyEnumC = 1 << 2,
	MyEnumD = 1 << 3,
	MyEnumE = 1 << 4,
	MyEnumF = 1 << 5,
	MyEnumG = 1 << 6,
	MyEnumH = 1 << 7,
	MyEnumI = 1 << 8,
};

BOOL isISet(MyEnum e) {
	return e & MyEnumI;
}

int main(int argc, char *argv[]) {
	@autoreleasepool {
		MyEnum e = MyEnumI;
		BOOL a = isISet(e);
		NSLog(@"isISet = %@", a ? @"YES" : @"NO");
	}
}