自己动手实现一个队列LGQueue

自己动手实现一个队列LGQueue

//
//  LGQueue.h
//  AntsSportApp
//
//  Created by ligang on 15/3/24.
//  Copyright (c) 2015年 ligang. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface LGQueue : NSObject

@property (nonatomic, strong) NSMutableArray *queue;

@property (nonatomic, readonly) NSInteger count;

- (void)enterQueue:(id)object;
- (id)exitQueue;
- (void)clear;

@end

//
//  LGQueue.m
//  AntsSportApp
//
//  Created by ligang on 15/3/24.
//  Copyright (c) 2015年 ligang. All rights reserved.
//

#import "LGQueue.h"

@implementation LGQueue

- (id)init
{
if ( self = [super init] ) {

self.queue = [[NSMutableArray alloc] init];
_count = 0;

}
return self;
}

- (void)enterQueue:(id)object
{
[self.queue addObject:object];
_count = self.queue.count;
}

- (id)exitQueue
{
if ( self.queue.count == 0 )  return nil;

id object = [self.queue objectAtIndex:0];
[self.queue removeObjectAtIndex:0];
_count = self.queue.count;

return object;

}

- (void)clear
{
[self.queue removeAllObjects];
_count = 0;
}

@end