1#import <Foundation/Foundation.h>
2#import "NSObject+Custom.h"
3
4@implementation NSObject (Custom)
5
6- (void)methodIsAbstract:(SEL)selector;
7{
8    [NSException raise:NSInternalInconsistencyException
9		format:@"*** No concrete implementation for selector '%@' in class %@. Abstract definition must be overriden.",
10		NSStringFromSelector(selector), NSStringFromClass(isa)];
11}
12
13@end
14