Literals

main.m

//
//  main.m
//  Literals
//
//  Created by Bruno Gama on 14/06/12.
//  Copyright (c) 2012 Bruno Gama. All rights reserved.
//

#import <Foundation/Foundation.h>



int main(int argc, const char * argv[])
{

    @autoreleasepool {
        
        __block id  num = @ 5.1,
                    arr = @ [@"a", @"b", @"c", @1, @2., @.3],
                    dic = @{ @"hi" : num, @"sup" : arr };
        
#define _c(theString) \
    [[(theString) class] description]
        //  Console output:
        //  2012-06-14 21:30:35.296 Literals[8203:403] key=hi (__NSCFConstantString), obj=5.1 (__NSCFNumber)
        //  2012-06-14 21:30:35.298 Literals[8203:403] key=sup (__NSCFConstantString), obj=(
        //                                                                                  a,
        //                                                                                  b,
        //                                                                                  c,
        //                                                                                  1,
        //                                                                                  2,
        //                                                                                  "0.3"
        //                                                                                  ) (__NSArrayI)
        //
        [dic enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
            NSLog(@"key=%@ (%@), obj=%@ (%@)", key, _c(key), obj, _c(obj));
        }];
        
    }
    return 0;
}

for more literals

LLVM 3.1 Documentation http://clang.llvm.org/docs/ObjectiveCLiterals.html