//

 //  CollectionUtils.h

 //  MYUtilities

 //

 //  Created by Jens Alfke on 1/5/08.

 //  Copyright 2008 Jens Alfke. All rights reserved.

 //

 #import <Foundation/Foundation.h>

 // Collection creation conveniences:

 #define $array(OBJS...)     ({id objs[]={OBJS}; \

                               [NSArray arrayWithObjects: objs count: sizeof(objs)/sizeof(id)];})

 #define $marray(OBJS...)    ({id objs[]={OBJS}; \

                               [NSMutableArray arrayWithObjects: objs count: sizeof(objs)/sizeof(id)];})

 #define $dict(PAIRS...)     ({struct _dictpair pairs[]={PAIRS}; \

                               _dictof(pairs,sizeof(pairs)/sizeof(struct _dictpair));})

 #define $mdict(PAIRS...)    ({struct _dictpair pairs[]={PAIRS}; \

                               _mdictof(pairs,sizeof(pairs)/sizeof(struct _dictpair));})

 #define $object(VAL)        ({__typeof(VAL) v=(VAL); _box(&v,@encode(__typeof(v)));})

 // Apply a selector to each array element, returning an array of the results:

 NSArray* $apply( NSArray *src, SEL selector, id defaultValue );

 NSArray* $applyKeyPath( NSArray *src, NSString *keyPath, id defaultValue );

 // Object conveniences:

 BOOL $equal(id obj1, id obj2);      // Like -isEqual: but works even if either/both are nil

 NSString* $string( const char *utf8Str );

 #define $sprintf(FORMAT, ARGS... )  [NSString stringWithFormat: (FORMAT), ARGS]

 #define $cast(CLASSNAME,OBJ)        ((CLASSNAME*)(_cast([CLASSNAME class],(OBJ))))

 #define $castNotNil(CLASSNAME,OBJ)  ((CLASSNAME*)(_castNotNil([CLASSNAME class],(OBJ))))

 #define $castIf(CLASSNAME,OBJ)      ((CLASSNAME*)(_castIf([CLASSNAME class],(OBJ))))

 #define $castArrayOf(ITEMCLASSNAME,OBJ) _castArrayOf([ITEMCLASSNAME class],(OBJ)))

 void setObj( id *var, id value );

 BOOL ifSetObj( id *var, id value );

 void setString( NSString **var, NSString *value );

 BOOL ifSetString( NSString **var, NSString *value );

 #define $true   ((NSNumber*)kCFBooleanTrue)

 #define $false  ((NSNumber*)kCFBooleanFalse)

 @interface NSArray (MYUtils)

 - (BOOL) my_containsObjectIdenticalTo: (id)object;

 @end

 @interface NSSet (MYUtils)

 + (NSSet*) my_unionOfSet: (NSSet*)set1 andSet: (NSSet*)set2;

 + (NSSet*) my_intersectionOfSet: (NSSet*)set1 andSet: (NSSet*)set2;

 + (NSSet*) my_differenceOfSet: (NSSet*)set1 andSet: (NSSet*)set2;

 @end

 #pragma mark -

 #pragma mark FOREACH:

 #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5

 #define foreach(VAR,ARR) for(VAR in ARR)

 #else

 struct foreachstate {NSArray *array; unsigned n, i;};

 static inline struct foreachstate _initforeach( NSArray *arr ) {

     struct foreachstate s;

     s.array = arr;

     s.n = [arr count];

     s.i = 0;

     return s;

 }

 #define foreach(VAR,ARR) for( struct foreachstate _s = _initforeach((ARR)); \

                                    _s.i<_s.n && ((VAR)=[_s.array objectAtIndex: _s.i], YES); \

                                    _s.i++ )

 #endif

 // Internals (don't use directly)

 struct _dictpair { id key; id value; };

 NSDictionary* _dictof(const struct _dictpair*, size_t count);

 NSMutableDictionary* _mdictof(const struct _dictpair*, size_t count);

 NSValue* _box(const void *value, const char *encoding);

 id _cast(Class,id);

 id _castNotNil(Class,id);

 id _castIf(Class,id);

 NSArray* _castArrayOf(Class,NSArray*);