NSSet+NGAAdditions.m #1

//
//  NSSet+NGAAdditions.m
//  MarkdownPreview
//
//  Created by Michael Bishop on 11/3/11.
//  Copyright (c) 2011 Numerical Garden LLC. All rights reserved.
//

#import "NSSet+NGAAdditions.h"
#import "NGAUtilities.h"

@implementation NSSet (NGAAdditions)

-(id)setByRemovingObjects:(NSSet*)excludedObjects
{
    if ( excludedObjects == nil || [excludedObjects count]  == 0 )
        return AUTORELEASE( RETAIN(self) );
    
    NSMutableSet * survivingObjects = [NSMutableSet setWithCapacity:[self count]];
    
    for (id item in self)
    {
        if ( ![excludedObjects containsObject:item] )
            [survivingObjects addObject:item];
    }
    
    return [NSSet setWithSet:survivingObjects];
}

-(id)setByRemovingObject:(id)excludedObject
{
    if ( excludedObject == nil )
        return AUTORELEASE( RETAIN(self) );
    
    return [self setByRemovingObjects:[NSSet setWithObject:excludedObject]];
}



@end