[iOS开发站在巨人肩膀上]之How to implement Queue in Objective-C

本文来源：http://www.codeproject.com/Tips/226893/How-to-implement-Queue-in-Objective-C.aspx

HsuQueue.h

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@interface HsuQueue : NSObject {
	NSMutableArray* m_array;
}
 
- (void)enqueue:(id)anObject;
- (id)dequeue;
- (void)clear;
 
@property (nonatomic, readonly) int count;
 
@end

HsuQueue.m

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@implementation HsuQueue
 
@synthesize count;
 
- (id)init
{
	if( self=[super init] )
	{
		m_array = [[NSMutableArray alloc] init];
		count = 0;
	}
	return self;
}
 
- (void)dealloc {
	[m_array release];
	[self dealloc];
    [super dealloc];
}
 
- (void)enqueue:(id)anObject
{
	[m_array addObject:anObject];
	count = m_array.count;
}
- (id)dequeue
{
	id obj = nil;
	if(m_array.count > 0)
	{
		obj = [[[m_array objectAtIndex:0]retain]autorelease];
		[m_array removeObjectAtIndex:0];
		count = m_array.count;
	}
	return obj;
}
 
- (void)clear
{
	[m_array removeAllObjects];
	count = 0;
}
 
@end