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NSArray.m
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2715 lines (2408 loc) · 67.7 KB
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/** NSArray - Array object to hold other objects.
Copyright (C) 1995-2015 Free Software Foundation, Inc.
Written by: Andrew Kachites McCallum <mccallum@gnu.ai.mit.edu>
From skeleton by: Adam Fedor <fedor@boulder.colorado.edu>
Created: March 1995
Rewrite by: Richard Frith-Macdonald <richard@brainstorm.co.uk>
January 1998 - new methods and changes as documented for Rhapsody plus
changes of array indices to type unsigned, plus major efficiency hacks.
This file is part of the GNUstep Base Library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110 USA.
<title>NSArray class reference</title>
$Date$ $Revision$
*/
#import "common.h"
#import "Foundation/NSArray.h"
#import "Foundation/NSEnumerator.h"
#import "Foundation/NSCoder.h"
#import "Foundation/NSData.h"
#import "Foundation/NSRange.h"
#import "Foundation/NSException.h"
#import "Foundation/NSAutoreleasePool.h"
#import "Foundation/NSThread.h"
#import "Foundation/NSMapTable.h"
#import "Foundation/NSLock.h"
#import "Foundation/NSValue.h"
#import "Foundation/NSNull.h"
#import "Foundation/NSKeyValueCoding.h"
#import "Foundation/NSSet.h"
#import "Foundation/NSUserDefaults.h"
#import "Foundation/NSIndexSet.h"
// For private method _decodeArrayOfObjectsForKey:
#import "Foundation/NSKeyedArchiver.h"
#import "GSPrivate.h"
#import "GSPThread.h"
#import "GSFastEnumeration.h"
#import "GSDispatch.h"
#import "GSSorting.h"
static BOOL GSMacOSXCompatiblePropertyLists(void)
{
if (GSPrivateDefaultsFlag(NSWriteOldStylePropertyLists) == YES)
return NO;
return GSPrivateDefaultsFlag(GSMacOSXCompatible);
}
extern void GSPropertyListMake(id,NSDictionary*,BOOL,BOOL,unsigned,id*);
@interface NSArrayEnumerator : NSEnumerator
{
NSArray *array;
NSUInteger pos;
IMP get;
NSUInteger (*cnt)(NSArray*, SEL);
}
- (id) initWithArray: (NSArray*)anArray;
@end
@interface NSArrayEnumeratorReverse : NSArrayEnumerator
@end
static Class NSArrayClass;
static Class GSArrayClass;
static Class NSMutableArrayClass;
static Class GSMutableArrayClass;
static Class GSPlaceholderArrayClass;
static GSPlaceholderArray *defaultPlaceholderArray;
static NSMapTable *placeholderMap;
static pthread_mutex_t placeholderLock = PTHREAD_MUTEX_INITIALIZER;
/**
* A simple, low overhead, ordered container for objects. All the objects
* in the container are retained by it. The container may not contain nil
* (though it may contain [NSNull+null]).
*/
@implementation NSArray
static SEL addSel;
static SEL appSel;
static SEL countSel;
static SEL eqSel;
static SEL oaiSel;
static SEL remSel;
static SEL rlSel;
+ (void) atExit
{
DESTROY(defaultPlaceholderArray);
DESTROY(placeholderMap);
}
+ (void) initialize
{
if (self == [NSArray class])
{
[self setVersion: 1];
addSel = @selector(addObject:);
appSel = @selector(appendString:);
countSel = @selector(count);
eqSel = @selector(isEqual:);
oaiSel = @selector(objectAtIndex:);
remSel = @selector(removeObjectAtIndex:);
rlSel = @selector(removeLastObject);
NSArrayClass = [NSArray class];
NSMutableArrayClass = [NSMutableArray class];
GSArrayClass = [GSArray class];
GSMutableArrayClass = [GSMutableArray class];
GSPlaceholderArrayClass = [GSPlaceholderArray class];
/*
* Set up infrastructure for placeholder arrays.
*/
defaultPlaceholderArray = (GSPlaceholderArray*)
NSAllocateObject(GSPlaceholderArrayClass, 0, NSDefaultMallocZone());
placeholderMap = NSCreateMapTable(NSNonOwnedPointerMapKeyCallBacks,
NSNonRetainedObjectMapValueCallBacks, 0);
[self registerAtExit];
}
}
+ (id) allocWithZone: (NSZone*)z
{
if (self == NSArrayClass)
{
/*
* For a constant array, we return a placeholder object that can
* be converted to a real object when its initialisation method
* is called.
*/
if (z == NSDefaultMallocZone() || z == 0)
{
/*
* As a special case, we can return a placeholder for an array
* in the default malloc zone extremely efficiently.
*/
return defaultPlaceholderArray;
}
else
{
id obj;
/*
* For anything other than the default zone, we need to
* locate the correct placeholder in the (lock protected)
* table of placeholders.
*/
(void)pthread_mutex_lock(&placeholderLock);
obj = (id)NSMapGet(placeholderMap, (void*)z);
if (obj == nil)
{
/*
* There is no placeholder object for this zone, so we
* create a new one and use that.
*/
obj = (id)NSAllocateObject(GSPlaceholderArrayClass, 0, z);
NSMapInsert(placeholderMap, (void*)z, (void*)obj);
}
(void)pthread_mutex_unlock(&placeholderLock);
return obj;
}
}
else
{
return NSAllocateObject(self, 0, z);
}
}
/**
* Returns an empty autoreleased array.
*/
+ (id) array
{
id o;
o = [self allocWithZone: NSDefaultMallocZone()];
o = [o initWithObjects: (id*)0 count: 0];
return AUTORELEASE(o);
}
/**
* Returns a new autoreleased NSArray instance containing all the objects from
* array, in the same order as the original.
*/
+ (id) arrayWithArray: (NSArray*)array
{
id o;
o = [self allocWithZone: NSDefaultMallocZone()];
o = [o initWithArray: array];
return AUTORELEASE(o);
}
/**
* Returns an autoreleased array based upon the file. The new array is
* created using [NSObject+allocWithZone:] and initialised using the
* [NSArray-initWithContentsOfFile:] method. See the documentation for those
* methods for more detail.
*/
+ (id) arrayWithContentsOfFile: (NSString*)file
{
id o;
o = [self allocWithZone: NSDefaultMallocZone()];
o = [o initWithContentsOfFile: file];
return AUTORELEASE(o);
}
/**
* Returns an autoreleased array from the contents of aURL. The new array is
* created using [NSObject+allocWithZone:] and initialised using the
* -initWithContentsOfURL: method. See the documentation for those
* methods for more detail.
*/
+ (id) arrayWithContentsOfURL: (NSURL*)aURL
{
id o;
o = [self allocWithZone: NSDefaultMallocZone()];
o = [o initWithContentsOfURL: aURL];
return AUTORELEASE(o);
}
/**
* Returns an autoreleased array containing anObject.
*/
+ (id) arrayWithObject: (id)anObject
{
id o;
o = [self allocWithZone: NSDefaultMallocZone()];
o = [o initWithObjects: &anObject count: 1];
return AUTORELEASE(o);
}
/**
* Returns an autoreleased array containing the list
* of objects, preserving order.
*/
+ (id) arrayWithObjects: firstObject, ...
{
id a = [self allocWithZone: NSDefaultMallocZone()];
GS_USEIDLIST(firstObject,
a = [a initWithObjects: __objects count: __count]);
return AUTORELEASE(a);
}
/**
* Returns an autoreleased array containing the specified
* objects, preserving order.
*/
+ (id) arrayWithObjects: (const id[])objects count: (NSUInteger)count
{
return AUTORELEASE([[self allocWithZone: NSDefaultMallocZone()]
initWithObjects: objects count: count]);
}
/**
* Returns an autoreleased array formed from the contents of
* the receiver and adding anObject as the last item.
*/
- (NSArray*) arrayByAddingObject: (id)anObject
{
id na;
NSUInteger c = [self count];
if (anObject == nil)
[NSException raise: NSInvalidArgumentException
format: @"Attempt to add nil to an array"];
if (c == 0)
{
na = [[GSArrayClass allocWithZone: NSDefaultMallocZone()]
initWithObjects: &anObject count: 1];
}
else
{
GS_BEGINIDBUF(objects, c+1);
[self getObjects: objects];
objects[c] = anObject;
na = [[GSArrayClass allocWithZone: NSDefaultMallocZone()]
initWithObjects: objects count: c+1];
GS_ENDIDBUF();
}
return AUTORELEASE(na);
}
/**
* Returns a new array which is the concatenation of self and
* otherArray (in this precise order).
*/
- (NSArray*) arrayByAddingObjectsFromArray: (NSArray*)anotherArray
{
id na;
NSUInteger c;
NSUInteger l;
NSUInteger e;
c = [self count];
l = [anotherArray count];
e = c + l;
{
GS_BEGINIDBUF(objects, e);
[self getObjects: objects];
if ([anotherArray isProxy])
{
NSUInteger i = c;
NSUInteger j = 0;
while (i < e)
{
objects[i++] = [anotherArray objectAtIndex: j++];
}
}
else
{
[anotherArray getObjects: &objects[c]];
}
na = [NSArrayClass arrayWithObjects: objects count: e];
GS_ENDIDBUF();
}
return na;
}
/**
* Returns the abstract class ... arrays are coded as abstract arrays.
*/
- (Class) classForCoder
{
return NSArrayClass;
}
/**
* Returns YES if anObject belongs to self. No otherwise.<br />
* The [NSObject-isEqual:] method of anObject is used to test for equality.
*/
- (BOOL) containsObject: (id)anObject
{
return ([self indexOfObject: anObject] != NSNotFound);
}
/**
* Returns a new copy of the receiver.<br />
* The default abstract implementation of a copy is to use the
* -initWithArray:copyItems: method with the flag set to YES.<br />
* Immutable subclasses generally simply retain and return the receiver.
*/
- (id) copyWithZone: (NSZone*)zone
{
NSArray *copy = [NSArrayClass allocWithZone: zone];
return [copy initWithArray: self copyItems: YES];
}
- (NSUInteger) count
{
[self subclassResponsibility: _cmd];
return 0;
}
- (NSUInteger) countByEnumeratingWithState: (NSFastEnumerationState*)state
objects: (__unsafe_unretained id[])stackbuf
count: (NSUInteger)len
{
NSInteger count;
/* In a mutable subclass, the mutationsPtr should be set to point to a
* value (unsigned long) which will be changed (incremented) whenever
* the container is mutated (content added, removed, re-ordered).
* This is cached in the caller at the start and compared at each
* iteration. If it changes during the iteration then
* objc_enumerationMutation() will be called, throwing an exception.
* The abstract base class implementation points to a fixed value
* (the enumeration state pointer should exist and be unchanged for as
* long as the enumeration process runs), which is fine for enumerating
* an immutable array.
*/
state->mutationsPtr = (unsigned long *)&state->mutationsPtr;
count = MIN(len, [self count] - state->state);
/* If a mutation has occurred then it's possible that we are being asked to
* get objects from after the end of the array. Don't pass negative values
* to memcpy.
*/
if (count > 0)
{
IMP imp = [self methodForSelector: @selector(objectAtIndex:)];
int p = state->state;
int i;
for (i = 0; i < count; i++, p++)
{
stackbuf[i] = (*imp)(self, @selector(objectAtIndex:), p);
}
state->state += count;
}
else
{
count = 0;
}
state->itemsPtr = stackbuf;
return count;
}
/**
* Encodes the receiver for storing to archive or sending over an
* [NSConnection].
*/
- (void) encodeWithCoder: (NSCoder*)aCoder
{
NSUInteger count = [self count];
if ([aCoder allowsKeyedCoding])
{
/* HACK ... MacOS-X seems to code differently if the coder is an
* actual instance of NSKeyedArchiver
*/
if ([aCoder class] == [NSKeyedArchiver class])
{
[(NSKeyedArchiver*)aCoder _encodeArrayOfObjects: self
forKey: @"NS.objects"];
}
else
{
NSUInteger i;
for (i = 0; i < count; i++)
{
NSString *key;
key = [NSString stringWithFormat: @"NS.object.%lu", (unsigned long)i];
[(NSKeyedArchiver*)aCoder encodeObject: [self objectAtIndex: i]
forKey: key];
}
}
}
else
{
unsigned items = (unsigned)count;
[aCoder encodeValueOfObjCType: @encode(unsigned)
at: &items];
if (count > 0)
{
GS_BEGINIDBUF(a, count);
[self getObjects: a];
[aCoder encodeArrayOfObjCType: @encode(id)
count: count
at: a];
GS_ENDIDBUF();
}
}
}
/**
* Copies the objects from the receiver to aBuffer, which must be
* an area of memory large enough to hold them.
*/
- (void) getObjects: (__unsafe_unretained id[])aBuffer
{
NSUInteger i, c = [self count];
IMP get = [self methodForSelector: oaiSel];
for (i = 0; i < c; i++)
aBuffer[i] = (*get)(self, oaiSel, i);
}
/**
* Copies the objects from the range aRange of the receiver to aBuffer,
* which must be an area of memory large enough to hold them.
*/
- (void) getObjects: (__unsafe_unretained id[])aBuffer range: (NSRange)aRange
{
NSUInteger i, j = 0, c = [self count], e = aRange.location + aRange.length;
IMP get = [self methodForSelector: oaiSel];
GS_RANGE_CHECK(aRange, c);
for (i = aRange.location; i < e; i++)
aBuffer[j++] = (*get)(self, oaiSel, i);
}
/**
* Returns the same value as -count
*/
- (NSUInteger) hash
{
return [self count];
}
/**
* Returns the index of the specified object in the receiver, or
* NSNotFound if the object is not present.
*/
- (NSUInteger) indexOfObjectIdenticalTo: (id)anObject
{
NSUInteger c = [self count];
if (c > 0)
{
IMP get = [self methodForSelector: oaiSel];
NSUInteger i;
for (i = 0; i < c; i++)
if (anObject == (*get)(self, oaiSel, i))
return i;
}
return NSNotFound;
}
/**
* Returns the index of the specified object in the range of the receiver,
* or NSNotFound if the object is not present.
*/
- (NSUInteger) indexOfObjectIdenticalTo: anObject inRange: (NSRange)aRange
{
NSUInteger i, e = aRange.location + aRange.length, c = [self count];
IMP get = [self methodForSelector: oaiSel];
GS_RANGE_CHECK(aRange, c);
for (i = aRange.location; i < e; i++)
if (anObject == (*get)(self, oaiSel, i))
return i;
return NSNotFound;
}
/**
* Returns the index of the first object found in the receiver
* which is equal to anObject (using anObject's [NSObject-isEqual:] method).
* Returns NSNotFound on failure.
*/
- (NSUInteger) indexOfObject: (id)anObject
{
NSUInteger c = [self count];
if (c > 0 && anObject != nil)
{
NSUInteger i;
IMP get = [self methodForSelector: oaiSel];
BOOL (*eq)(id, SEL, id)
= (BOOL (*)(id, SEL, id))[anObject methodForSelector: eqSel];
for (i = 0; i < c; i++)
if ((*eq)(anObject, eqSel, (*get)(self, oaiSel, i)) == YES)
return i;
}
return NSNotFound;
}
/**
* Returns the index of the first object found in aRange of receiver
* which is equal to anObject (using anObject's [NSObject-isEqual:] method).
* Returns NSNotFound on failure.
*/
- (NSUInteger) indexOfObject: (id)anObject inRange: (NSRange)aRange
{
NSUInteger i, e = aRange.location + aRange.length, c = [self count];
IMP get = [self methodForSelector: oaiSel];
BOOL (*eq)(id, SEL, id)
= (BOOL (*)(id, SEL, id))[anObject methodForSelector: eqSel];
GS_RANGE_CHECK(aRange, c);
for (i = aRange.location; i < e; i++)
{
if ((*eq)(anObject, eqSel, (*get)(self, oaiSel, i)) == YES)
return i;
}
return NSNotFound;
}
/**
* <p>In MacOS-X class clusters do not have designated initialisers,
* and there is a general rule that -init is treated as the designated
* initialiser of the class cluster, but that other intitialisers
* may not work s expected an would need to be individually overridden
* in any subclass.
* </p>
* <p>GNUstep tries to make it easier to subclass a class cluster,
* by making class clusters follow the same convention as normal
* classes, so the designated initialiser is the <em>richest</em>
* initialiser. This means that all other initialisers call the
* documented designated initialiser (which calls -init only for
* MacOS-X compatibility), and anyone writing a subclass only needs
* to override that one initialiser in order to have all the other
* ones work.
* </p>
* <p>For MacOS-X compatibility, you may also need to override various
* other initialisers. Exactly which ones, you will need to determine
* by trial on a MacOS-X system ... and may vary between releases of
* MacOS-X. So to be safe, on MacOS-X you probably need to re-implement
* <em>all</em> the class cluster initialisers you might use in conjunction
* with your subclass.
* </p>
*/
- (id) init
{
self = [super init];
return self;
}
/**
* Initialize the receiver with the contents of array.
* The order of array is preserved.<br />
* If shouldCopy is YES then the objects are copied
* rather than simply retained.<br />
* Invokes -initWithObjects:count:
*/
- (id) initWithArray: (NSArray*)array copyItems: (BOOL)shouldCopy
{
NSUInteger c = [array count];
GS_BEGINIDBUF(objects, c);
if ([array isProxy])
{
NSUInteger i;
for (i = 0; i < c; i++)
{
objects[i] = [array objectAtIndex: i];
}
}
else
{
[array getObjects: objects];
}
if (shouldCopy == YES)
{
NSUInteger i;
for (i = 0; i < c; i++)
{
objects[i] = [objects[i] copy];
}
self = [self initWithObjects: objects count: c];
while (i > 0)
{
[objects[--i] release];
}
}
else
{
self = [self initWithObjects: objects count: c];
}
GS_ENDIDBUF();
return self;
}
/**
* Initialize the receiver with the contents of array.
* The order of array is preserved.<br />
* Invokes -initWithObjects:count:
*/
- (id) initWithArray: (NSArray*)array
{
NSUInteger c = [array count];
GS_BEGINIDBUF(objects, c);
if ([array isProxy])
{
NSUInteger i;
for (i = 0; i < c; i++)
{
objects[i] = [array objectAtIndex: i];
}
}
else
{
[array getObjects: objects];
}
self = [self initWithObjects: objects count: c];
GS_ENDIDBUF();
return self;
}
/**
* Initialize the array by decoding from an archive.<br />
* Invokes -initWithObjects:count:
*/
- (id) initWithCoder: (NSCoder*)aCoder
{
if ([aCoder allowsKeyedCoding])
{
id array;
array = [(NSKeyedUnarchiver*)aCoder _decodeArrayOfObjectsForKey:
@"NS.objects"];
if (array == nil)
{
NSUInteger i = 0;
NSString *key;
id val;
array = [NSMutableArray arrayWithCapacity: 2];
key = [NSString stringWithFormat: @"NS.object.%lu", (unsigned long)i];
val = [(NSKeyedUnarchiver*)aCoder decodeObjectForKey: key];
while (val != nil)
{
[array addObject: val];
i++;
key = [NSString stringWithFormat: @"NS.object.%lu", (unsigned long)i];
val = [(NSKeyedUnarchiver*)aCoder decodeObjectForKey: key];
}
}
self = [self initWithArray: array];
}
else
{
unsigned items;
[aCoder decodeValueOfObjCType: @encode(unsigned)
at: &items];
if (items > 0)
{
GS_BEGINIDBUF(contents, items);
[aCoder decodeArrayOfObjCType: @encode(id)
count: items
at: contents];
self = [self initWithObjects: contents count: items];
while (items-- > 0)
{
[contents[items] release];
}
GS_ENDIDBUF();
}
else
{
self = [self initWithObjects: 0 count: 0];
}
}
return self;
}
/**
* <p>Initialises the array with the contents of the specified file,
* which must contain an array in property-list format.
* </p>
* <p>In GNUstep, the property-list format may be either the OpenStep
* format (ASCII data), or the MacOS-X format (UTF-8 XML data) ... this
* method will recognise which it is.
* </p>
* <p>If there is a failure to load the file for any reason, the receiver
* will be released, the method will return nil, and a warning may be logged.
* </p>
* <p>Works by invoking [NSString-initWithContentsOfFile:] and
* [NSString-propertyList] then checking that the result is an array.
* </p>
*/
- (id) initWithContentsOfFile: (NSString*)file
{
NSString *myString;
myString = [[NSString allocWithZone: NSDefaultMallocZone()]
initWithContentsOfFile: file];
if (myString == nil)
{
DESTROY(self);
}
else
{
id result;
NS_DURING
{
result = [myString propertyList];
}
NS_HANDLER
{
result = nil;
}
NS_ENDHANDLER
RELEASE(myString);
if ([result isKindOfClass: NSArrayClass])
{
//self = [self initWithArray: result];
/* OSX appears to always return a mutable array rather than
* the class of the receiver.
*/
RELEASE(self);
self = RETAIN(result);
}
else
{
NSWarnMLog(@"Contents of file '%@' does not contain an array", file);
DESTROY(self);
}
}
return self;
}
/**
* <p>Initialises the array with the contents of the specified URL,
* which must contain an array in property-list format.
* </p>
* <p>In GNUstep, the property-list format may be either the OpenStep
* format (ASCII data), or the MacOS-X format (UTF8 XML data) ... this
* method will recognise which it is.
* </p>
* <p>If there is a failure to load the URL for any reason, the receiver
* will be released, the method will return nil, and a warning may be logged.
* </p>
* <p>Works by invoking [NSString-initWithContentsOfURL:] and
* [NSString-propertyList] then checking that the result is an array.
* </p>
*/
- (id) initWithContentsOfURL: (NSURL*)aURL
{
NSString *myString;
myString = [[NSString allocWithZone: NSDefaultMallocZone()]
initWithContentsOfURL: aURL];
if (myString == nil)
{
DESTROY(self);
}
else
{
id result;
NS_DURING
{
result = [myString propertyList];
}
NS_HANDLER
{
result = nil;
}
NS_ENDHANDLER
RELEASE(myString);
if ([result isKindOfClass: NSArrayClass])
{
self = [self initWithArray: result];
}
else
{
NSWarnMLog(@"Contents of URL '%@' does not contain an array", aURL);
DESTROY(self);
}
}
return self;
}
- (id) initWithObjects: (const id[])objects count: (NSUInteger)count
{
self = [self init];
return self;
}
/**
* Initialize the array the list of objects.
* <br />May change the value of self before returning it.
*/
- (id) initWithObjects: firstObject, ...
{
GS_USEIDLIST(firstObject,
self = [self initWithObjects: __objects count: __count]);
return self;
}
/**
* Returns an NSMutableArray instance containing the same objects as
* the receiver.<br />
* The default implementation does this by calling the
* -initWithArray:copyItems: method on a newly created object,
* and passing it NO to tell it just to retain the items.
*/
- (id) mutableCopyWithZone: (NSZone*)zone
{
NSMutableArray *copy = [NSMutableArrayClass allocWithZone: zone];
return [copy initWithArray: self copyItems: NO];
}
- (id) objectAtIndex: (NSUInteger)index
{
[self subclassResponsibility: _cmd];
return nil;
}
- (id) objectAtIndexedSubscript: (NSUInteger)anIndex
{
return [self objectAtIndex: anIndex];
}
- (NSArray *) objectsAtIndexes: (NSIndexSet *)indexes
{
//FIXME: probably slow!
NSMutableArray *group = [NSMutableArray arrayWithCapacity: [indexes count]];
NSUInteger i = [indexes firstIndex];
while (i != NSNotFound)
{
[group addObject: [self objectAtIndex: i]];
i = [indexes indexGreaterThanIndex: i];
}
return GS_IMMUTABLE(group);
}
- (BOOL) isEqual: (id)anObject
{
if (self == anObject)
return YES;
if ([anObject isKindOfClass: NSArrayClass])
return [self isEqualToArray: anObject];
return NO;
}
/**
* Returns YES if the receiver is equal to otherArray, NO otherwise.
*/
- (BOOL) isEqualToArray: (NSArray*)otherArray
{
NSUInteger i, c;
if (self == (id)otherArray)
return YES;
c = [self count];
if (c != [otherArray count])
return NO;
if (c > 0)
{
IMP get0 = [self methodForSelector: oaiSel];
IMP get1 = [otherArray methodForSelector: oaiSel];
for (i = 0; i < c; i++)
if (![(*get0)(self, oaiSel, i) isEqual: (*get1)(otherArray, oaiSel, i)])
return NO;
}
return YES;
}
/**
* Returns the last object in the receiver, or nil if the receiver is empty.
*/
- (id) lastObject
{
NSUInteger count = [self count];
if (count == 0)
return nil;
return [self objectAtIndex: count-1];
}
/**
* Returns the first object in the receiver, or nil if the receiver is empty.
*/
- (id) firstObject
{
NSUInteger count = [self count];
if (count == 0)
return nil;
return [self objectAtIndex: 0];
}
/**
* Makes each object in the array perform aSelector.<br />
* This is done sequentially from the first to the last object.
*/
- (void) makeObjectsPerformSelector: (SEL)aSelector
{
NSUInteger c = [self count];
if (c > 0)
{
IMP get = [self methodForSelector: oaiSel];
NSUInteger i = 0;