MySingleton.m

//
//  MySingleton.m
//  
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:

//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.

//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.
//
//  Created by Alex Fish on 27/08/2011.
//  Copyright 2011 Alex E Fish. All rights reserved.
//

#import "MySingleton.h"

@implementation MySingleton

static MySingleton *sharedSingleton = nil;

// calling [MySingleton sharedSingleton] will return our singleton object
+ (MySingleton *)sharedSingleton 
{
    // ensure singleton is thread safe
    @synchronized(self) {
        if(!sharedSingleton){
            sharedSingleton = [[MySingleton alloc] init];
        }
        return sharedSingleton;
    }
    
}

// User can still create multiple instances using init
- (id)init
{
    self = [super init];
    if (self) {
        // Initialization code here.
    }
    
    return self;
}

@end