Objective-C note

[gkernel]

id: pointer to object

introspaction:
isa: instance variable of any object
[anObject isMemberOfClass:someClass]
[anObject isKindOfClass:someClass]

[[someClass alloc] init]
+ (void)initialize { }

@interface ClassName : SuperClass < protocol list (separated by commas) >
{
instance variable declarations
@private
@protected (default)
@public
}
method declarations
@end

+- (returnType)methodName:(argType)arg1 argName:(argType)arg2

@implementation ClassName
method definitions
@end

@protocol ProtocolName
method declarations
@end

[gkernel]