IOS开发基础篇之──Object-C Stack 容器

原贴地址：http://blog.csdn.net/cloudhsu/article/details/6589311

由于Object-C中没有提供Stack容器,因此自己实践了一个简单的stack容器

#import <Foundation/Foundation.h>


@interface NSStack : NSObject {
NSMutableArray* m_array;
int count;
}


- (void)push:(id)anObject;
- (id)pop;
- (void)clear;


@property (nonatomic, readonly) int count;

@end

#import "NSStack.h"


@implementation NSStack


@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)push:(id)anObject
{
[m_array addObject:anObject];
count = m_array.count;
}
- (id)pop
{
    id obj = nil;
    if(m_array.count > 0)
    {
        obj = [[[m_array lastObject]retain]autorelease];
        [m_array removeLastObject];
        count = m_array.count;
    }
    return obj;
}


- (void)clear
{
[m_array removeAllObjects];
        count = 0;
}


@end