Simple value transfer like `NSIsNotNil`, but for NSNotFound

KSIsNotNSNotFound.h

//
//  KSIsNotNSNotFound.h
//  Sandvox
//
//  Created by Mike on 16/01/2011.
//  Copyright 2011 Karelia Software. All rights reserved.
//

#import <Cocoa/Cocoa.h>


@interface KSIsNotNSNotFound : NSValueTransformer
@end

KSIsNotNSNotFound.m

//
//  KSIsNotNSNotFound.m
//  Sandvox
//
//  Created by Mike on 16/01/2011.
//  Copyright 2011 Karelia Software. All rights reserved.
//

#import "KSIsNotNSNotFound.h"


@implementation KSIsNotNSNotFound

+ (Class)transformedValueClass; { return [NSNumber class]; }
+ (BOOL)allowsReverseTransformation; { return NO; }

- (id)transformedValue:(id)value;
{
    BOOL result = [value unsignedIntegerValue] != NSNotFound;
    return NSBOOL(result);
}

@end