Class.mm

#import <Cocoa/Cocoa.h>

// Ideally the interface should in .h
@interface Photo : NSObject {
    NSString* caption;
    NSString* photographer;
    NSString* instrument;
    NSString* musician;
}

@property (retain) NSString* instrument;
@property (retain) NSString* musician;

- (NSString*) caption;
- (NSString*) photographer;

- (void) setCaption: (NSString*)input;
- (void) setPhotographer: (NSString*)input;
@end

// the implementation should in .mm
@implementation Photo
@synthesize instrument;
@synthesize musician;
    
- (NSString*) caption {
    return caption;
}

- (NSString*) photographer {
    return photographer;
}

- (void) setCaption: (NSString*)input
{
    [caption autorelease];
    caption = [input retain];
}

- (void) setPhotographer: (NSString*)input
{
    [photographer autorelease];
    photographer = [input retain];
}

- (id) init
{
    if ( self = [super init] )
    {
        [self setCaption:@"Default Caption"];
        [self setPhotographer:@"Default Photographer"];
    }
	//NSLog ( @"\n Photo Alloced");
    return self;
}

- (void) dealloc
{
	//NSLog ( @"\n Photo Dealloced");
    [caption release];
    [photographer release];
    [super dealloc];
}
@end

int main(int argc, const char * argv[])
{
	Photo* obj1 = [[Photo alloc] init];
	[obj1 setCaption:@"My First Musician"];
	[obj1 setPhotographer:@"ABC"];
	[obj1 setInstrument:@"Piano"];
	[obj1 setMusician:@"Yanni"];
	NSLog ( @"\n ===> %@, %@, %@, %@", [obj1 caption], [obj1 photographer], [obj1 instrument], [obj1 musician]);
	//NSLog ( @"\n RETAINT CNT ===> %ld", [[obj1 caption] retainCount]);
	NSLog ( @"\n RETAINT CNT ===> %ld", [obj1 retainCount]);
	
	Photo* obj2 = [[Photo alloc] init];
	[obj2 setCaption:@"My Second Musician"];
	[obj2 setPhotographer:@"XYZ"];
	[obj2 setInstrument:@"Flute"];
	[obj2 setMusician:@"Andre Rieu"];
	NSLog ( @"\n ===> %@, %@, %@, %@", [obj2 caption], [obj2 photographer], [obj2 instrument], [obj2 musician]);

	[obj1 release];
	[obj2 release];
    return 0;
}

// Command to build in TERMINAL
/*clang -framework Cocoa Class.mm -o Class.app*/