"What is the only* public class in the cocoa frameworks that has no methods of its own?" https://twitter.com/NSLondonMeetup/status/394473852094259200

.gitignore

FindClasses

find.sh

#!/bin/sh

FWK_PATH="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk/System/Library/Frameworks"

clang -o FindClasses -std=c99 -framework Foundation FindClasses.m

headers="`find "$FWK_PATH" -name '*.h'`"
for class in `./FindClasses 2>&1|cut -d" " -f4`
do
  grep $class $headers >/dev/null 2>&1
  if [ $? -eq 0 ]
  then
    echo $class
  fi
done

FindClasses.m

#import <Foundation/Foundation.h>
#import <objc/runtime.h>

int main(int argc, char *argv[]) {
	@autoreleasepool {
        int numClasses;
        Class * classes = NULL;
        
        classes = NULL;
        numClasses = objc_getClassList(NULL, 0);
        
        if (numClasses > 0 )
        {
            classes = malloc(sizeof(Class) * numClasses);
            numClasses = objc_getClassList(classes, numClasses);
            
            for (int i = 0; i < numClasses; i++) {
                unsigned int numMethods;
                Method *methods = class_copyMethodList(classes[i], &numMethods);
                free(methods);
                
                if (numMethods == 0) {
                    NSString* className = NSStringFromClass(classes[i]);
                    if ([className rangeOfString:@"_"].location == NSNotFound) {
                        NSLog(@"%@", className);
                    }
                }
            }
            
            free(classes);
        }
	}
}

$ ./find.sh
NSURLSessionDataTask
NSURLSessionUploadTask
NSURLSessionDownloadTask

(and, yes, the answer is semi-wrong because the program runs on OS X and the script examines iOS headers)