Macros for creating NSArray and NSSet objects as replacement for @[…] literal.

NSLiterals.m

// Macros for creating NSArray and NSSet objects as replacement for @[…] literal.

let components = NSArray(street, city, state, country);

// Advantages:
//  1. Type of NSArray is inferred, in this case it’s NSArray<NSString *> *
//  2. List of objects is type-checked, so mixing types like NSArray(@42, @"Hi") will report compilation error.
//  3. Ability to allocate any class, not just NSArray. For example NSSet and NSMutableArray.
//  4. Avoids stupid clang bracket matching bug, if you know what I mean.



#define let  __auto_type const

#define NSArray(first, other...) \
    ( (NSArray<typeof(first)> *) ({ \
        typeof(first) _objects[] = {first, other}; \
        NSUInteger _count = sizeof(_objects) / sizeof(id); \
        [NSArray arrayWithObjects:_objects count:_count]; \
    }))

#define NSSet(first, other...) \
    ( (NSSet<typeof(first)> *) ({ \
        typeof(first) _objects[] = {first, other}; \
        NSUInteger _count = sizeof(_objects) / sizeof(id); \
        [NSSet setWithObjects:_objects count:_count]; \
    }))

#define NSMutableArray(first, other...) \
    ( (NSMutableArray<typeof(first)> *) ({ \
        typeof(first) _objects[] = {first, other}; \
        NSUInteger _count = sizeof(_objects) / sizeof(id); \
        [NSMutableArray arrayWithObjects:_objects count:_count]; \
    }))

#define NSMutableSet(first, other...) \
    ( (NSMutableSet<typeof(first)> *) ({ \
        typeof(first) _objects[] = {first, other}; \
        NSUInteger _count = sizeof(_objects) / sizeof(id); \
        [NSMutableSet setWithObjects:_objects count:_count]; \
    }))