File: NSObject%2BCustom.m

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#import <Foundation/Foundation.h>
#import "NSObject+Custom.h"

@implementation NSObject (Custom)

- (void)methodIsAbstract:(SEL)selector;
{
    [NSException raise:NSInternalInconsistencyException 
		format:@"*** No concrete implementation for selector '%@' in class %@. Abstract definition must be overridden.",
		NSStringFromSelector(selector), NSStringFromClass(isa)];
}

@end