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@interface UntoggleableSwitch : UISwitch

@end

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/*
Core Data is great but automatic migrations can be tricky. Migrations can take a long time, which could
result in [your app being terminated](http://stackoverflow.com/questions/13333289/core-data-timeout-adding-persistent-store-on-application-launch) 
if it is happening on the main thread during application launch. Performing migrations on a background 
thread is also a [bad idea](http://stackoverflow.com/a/2866725/503916), meaning your application really
needs to be able to fully launch *without a Core Data stack whatsoever* in order to safely migrate. 
This can be a huge change to make to an existing app.

If you're really only using Core Data as a cache, you don't actually *need* to perform a migration. 
Simply check if the existing store is compatible with your managed object model and if so, delete 

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Generate the list yourself:

$ cd /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/
  Developer/SDKs/iPhoneOS*.sdk/System/Library/Frameworks/UIKit.framework/Headers
$ grep -H UI_APPEARANCE_SELECTOR ./* | sed 's/ __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_5_0) UI_APPEARANCE_SELECTOR;//'

UIActivityIndicatorView

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$ sudo apachectl stop 
$ sudo launchctl unload /System/Library/LaunchDaemons/org.apache.httpd.plist

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dispatch_group_t group = dispatch_group_create();
dispatch_semaphore_t semaphore = dispatch_semaphore_create(10);
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
for (int i = 0; i < 100; i++)
{
    dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);
    dispatch_group_async(group, queue, ^{
        NSLog(@"%i",i);
        sleep(2);
        dispatch_semaphore_signal(semaphore);

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import Foundation

class Box<T> {
    let unbox: T
    init(_ value: T) { self.unbox = value }
}

struct Notification<A> {
    let name: String
}