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git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@29669 72102866-910b-0410-8b05-ffd578937521
111 lines
2.9 KiB
Objective-C
111 lines
2.9 KiB
Objective-C
/** NSEnumerator abstrace class for GNUStep
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Copyright (C) 1995, 1996 Free Software Foundation, Inc.
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Written by: Andrew Kachites McCallum <mccallum@gnu.ai.mit.edu>
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Date: March 1995
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This file is part of the GNUstep Base Library.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02111 USA.
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<title>NSEnumerator class reference</title>
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$Date$ $Revision$
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*/
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#import "common.h"
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#import "Foundation/NSArray.h"
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#import "Foundation/NSEnumerator.h"
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#import "Foundation/NSException.h"
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#import "GNUstepBase/NSObject+GNUstepBase.h"
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/**
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* Simple class for iterating over a collection of objects, usually returned
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* from an [NSArray] or similar.
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*/
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@implementation NSEnumerator
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/**
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* Returns all objects remaining in the enumeration as an array.<br />
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* Calling this method 'exhausts' the enumerator, leaving it at the
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* end of the collection being enumerated.
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*/
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- (NSArray*) allObjects
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{
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NSMutableArray *array;
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id obj;
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SEL nsel;
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IMP nimp;
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SEL asel;
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IMP aimp;
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array = [NSMutableArray arrayWithCapacity: 10];
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nsel = @selector(nextObject);
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nimp = [self methodForSelector: nsel];
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asel = @selector(addObject:);
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aimp = [array methodForSelector: asel];
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while ((obj = (*nimp)(self, nsel)) != nil)
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{
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(*aimp)(array, asel, obj);
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}
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return array;
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}
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/**
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* Returns next object in enumeration, or nil if none remain. Use code like
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* <code>while (object = [enumerator nextObject]) { ... }</code>.
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*/
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- (id) nextObject
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{
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[self subclassResponsibility:_cmd];
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return nil;
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}
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- (NSUInteger) countByEnumeratingWithState: (NSFastEnumerationState*)state
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objects: (id*)stackbuf
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count: (NSUInteger)len
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{
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IMP nextObject = [self methodForSelector: @selector(nextObject)];
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int i;
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state->itemsPtr = stackbuf;
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state->mutationsPtr = (unsigned long*)self;
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for (i = 0; i < len; i++)
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{
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id next = nextObject(self, @selector(nextObject));
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if (nil == next)
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{
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return i;
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}
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*(stackbuf+i) = next;
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}
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return len;
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}
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@end
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/**
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* objc_enumerationMutation() is called whenever a collection mutates in the
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* middle of fast enumeration.
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*/
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void objc_enumerationMutation(id obj)
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{
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[NSException raise: NSGenericException
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format: @"Collection %@ was mutated while being enumerated",
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obj];
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}
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