This class implements the Foundation framework's exception-handling system. Exceptions are used in Cocoa as a mechanism to deal with special conditions in the execution of a program that may require special handling. Clients can use NSException objects to raise exceptions (creating a special condition), as well as to retrieve information about an exception. For details on exception handling, see Chapter 2.

@interface NSException : NSObject <NSCoding, NSCopying>
// Convenience Constructors
+ (NSException *)exceptionWithName:(NSString *)name reason:(NSString *)reason userInfo:(NSDictionary *)userInfo;
// Initializers
- (id)initWithName:(NSString *)aName reason:(NSString *)aReason userInfo:(NSDictionary *)aUserInfo;
// Class Methods
+ (void)raise:(NSString *)name format:(NSString *)format arguments:(va_list)argList;
+ (void)raise:(NSString *)name format:(NSString *)format, ...;
// Instance Methods
- (NSString *)name;
- (void)raise;
- (NSString *)reason;
- (NSDictionary *)userInfo;
// Methods Implementing NSCoding
- (void)encodeWithCoder:(NSCoder *)aCoder;
- (id)initWithCoder:(NSCoder *)aDecoder;
// Methods Implementing NSCopying
- (id)copyWithZone:(NSZone *)zone;