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#import <Cocoa/Cocoa.h>
#import <objc/runtime.h>

@implementation NSControl (Subclasses)

+ (void)load
{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        method_exchangeImplementations(class_getInstanceMethod([self class], @selector(initWithCoder:)),

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+ (UIColor *)colorBetweenColor:(UIColor *)color1
                      andColor:(UIColor *)color2
                    atProgress:(CGFloat)progress
{
    CGFloat r1,g1,b1,a1,r2,g2,b2,a2;
    [color1 getRed:&r1 green:&g1 blue:&b1 alpha:&a1];
    [color2 getRed:&r2 green:&g2 blue:&b2 alpha:&a2];
    return [UIColor colorWithRed:r1+(r2-r1)*progress
                           green:g1+(g2-g1)*progress
                            blue:b1+(b2-b1)*progress

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#import <UIKit/UIKit.h>

@interface TintedButton : UIButton

@end

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- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [self.navigationController setNavigationBarHidden:NO animated:YES];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    if (self.isMovingFromParentViewController)

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int64_t nn = 100000000;
vector<int> ip(nn,1);
size_t pos = 2;
ip[0] = 0;
ip[1] = 0;
while ((pos = find(ip.begin()+pos, ip.end(), 1) - ip.begin()) < nn) {
    for (size_t j = pos*pos; j < ip.size(); j+=pos)
        ip[j] = 0;
    pos += 1 + (pos>2);
}

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Before iOS 8, you do this:
```
[backgroundViewController setModalPresentationStyle:UIModalPresentationCurrentContext];
[backgroundViewController presentViewController:_myMoreAppsViewController animated:NO completion:nil];
```
in iOS 8, you have to do this:
```
backgroundViewController.providesPresentationContextTransitionStyle = YES;
backgroundController.definesPresentationContext = YES;
[overlayViewController setModalPresentationStyle:UIModalPresentationOverCurrentContext];

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func elem<T: Equatable>(item: @autoclosure ()->T) -> (@autoclosure ()->[T]) -> Bool {
    return { (arr: @autoclosure ()->[T]) in find(arr(), item()) != nil }
}

let found = elem (2) ([1,2,3]) // Hope to avoid braces in future

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prefix func !<T>(f: (T)->Bool) -> (T)->Bool
{
    return { !f($0) }
}

func &&<T>(f1: (T)->Bool, f2: (T)->Bool) -> (T)->Bool
{
    return { f1($0) && f2($0) }
}

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func bind1<T1,V>(f: (T1)->V, t1: T1) -> ()->V
{
    return { () -> V in f(t1) }
}

func bind1<T1,T2,V>(f: (T1,T2)->V, t1: T1) -> (T2)->V
{
    return { t2 -> V in f(t1,t2) }
}

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@interface NSIndexPath (SharedIndexPath)
@end
@implementation NSIndexPath (SharedIndexPath)
+ (instancetype)sharedIndexPathForRow:(NSInteger)row inSection:(NSInteger)section
{
    static NSIndexPath *arr[10][10] = {nil};
    if (arr[row][section] == nil)
        arr[row][section] = [NSIndexPath indexPathForRow:row inSection:section];
    return arr[row][section];
}