NSArray Category

NSArrayUtils

//
//  NSArray_NSArrayUtils.h
//  GCDAndBlocks
//
//  Created by Daniel Hollis on 21/02/2012.
//  Copyright (c) 2012 Mobile Interactive Group. All rights reserved.
//

#import <Foundation/Foundation.h>

#ifdef DEBUG
#   define DLog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__);
#else
#   define DLog(...)
#endif

//ALog always displays output regardless of the DEBUG setting
#define ALog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__);

@interface NSArray (Utils)
-(id)safeObjectAtIndex:(NSUInteger)integer;
@end

@implementation NSArray (Utils)

-(id)safeObjectAtIndex:(NSUInteger)integer
{
    
    if (__builtin_expect(([self count] > integer),1)) {
        return [self objectAtIndex:integer];
    } else {
        
        NSArray *syms = [NSThread  callStackSymbols]; 
        
        if ([syms count] > 1) { 
            DLog(@"<%@ %p> %@ - caller: %@ ", [self class], self, NSStringFromSelector(_cmd),[syms objectAtIndex:1]);
        } else {
            DLog(@"<%@ %p> %@", [self class], self, NSStringFromSelector(_cmd)); 
        }
   
        
        #ifdef DEBUG
        @throw [NSException exceptionWithName:@"MIG: Index Out Of Bounds" reason:@"Array stack not big enough for index" userInfo:nil];
        #endif
    }
    
    return nil;
}
@end