Class Description
NSDecimalNumberHandler is a class that adopts the NSDecimalNumberBehaviors protocol. This class allows you to set the way an NSDecimalNumber rounds off and handles errors, without having to create a custom class.
You can use an instance of this class as an argument to any of the NSDecimalNumber methods that end with …Behavior:. If you don�t think you need special behavior, you probably don�t need this class. The odds are that NSDecimalNumber�s default behavior will suit your needs.
For more information, see the NSDecimalNumberBehaviors protocol specification.
Apple Documentation
http://developer.apple.com/documentation/Cocoa/Reference/Foundation/Classes/NSDecimalNumberHandler_Class/
See Also
*NSDecimalNumber *NSDecimalNumberBehaviors