zwaldowski

/// Compare and swap references.
///
/// This function compares the reference `old` to the reference in the 
/// location referenced by `to`.  If the references match, this method
/// stores the reference `new` to that location atomically.
///
/// Similar to a pointer compare-and-swap, but safe for owned (retaining) pointers:
///  - ObjC: `MyObject *__strong *`
///  - Swift: `UnsafeMutablePointer<MyObject>`
/// If the swap is made, the new value is retained by its owning pointer.

zwaldowski

// Derived from http://blog.krzyzanowskim.com/2015/10/24/chunksequence-have-cake-and-eat-it/

struct ChunkSequence<Element>: SequenceType {
    typealias Collection = AnyForwardCollection<Element>
    let collection: Collection
    let chunkSize: Collection.Index.Distance
    
    private init<C: CollectionType where C.Index: ForwardIndexType, C.Generator.Element == Element>(_ base: C, chunkSize: C.Index.Distance) {
        self.collection = AnyForwardCollection(base)
        self.chunkSize = chunkSize.toIntMax()

zwaldowski

~ xcrun -n -v --show-sdk-platform-path
xcrun: note: looking up SDK with '/Applications/Xcode.app/Contents/Developer/usr/bin/xcodebuild -sdk macosx -version Path'
xcrun: note: PATH = '/usr/local/opt/rbenv/shims:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin'
xcrun: note: SDKROOT = 'macosx'
xcrun: note: TOOLCHAINS = ''
xcrun: note: DEVELOPER_DIR = '/Applications/Xcode.app/Contents/Developer'
xcrun: note: XCODE_DEVELOPER_USR_PATH = ''
xcrun: note: xcrun_db = '/var/folders/vg/h8b5rtg91y36r8d_44kfp6j00000gn/T/xcrun_db'
2015-09-25 11:06:46.977 xcodebuild[59708:8756864] [MT] PluginLoading: Required plug-in compatibility UUID 0420B86A-AA43-4792-9ED0-6FE0F2B16A13 for plug-in at path '~/Library/Application Support/Developer/Shared/Xcode/Plug-ins/Multiplex.xcplugin' not present in DVTPlugInCompatibilityUUIDs
2015-09-25 11:06:46.979 xcodebuild[59708:8756864] [MT] PluginLoading: Required plug-in compatibility UUID 0420B86A-AA43-4792-9ED0-6FE0F2B16A13 for plug-in at path '~/Library/Application Support/Developer/Shared/Xcode/

zwaldowski

~ xcrun -n -v --show-sdk-platform-path
xcrun: note: looking up SDK with '/Applications/Xcode-6.app/Contents/Developer/usr/bin/xcodebuild -sdk macosx -version Path'
2015-09-25 11:00:15.279 xcodebuild[59635:8742785] [MT] PluginLoading: Required plug-in compatibility UUID 7FDF5C7A-131F-4ABB-9EDC-8C5F8F0B8A90 for plug-in at path '~/Library/Application Support/Developer/Shared/Xcode/Plug-ins/Multiplex.xcplugin' not present in DVTPlugInCompatibilityUUIDs
xcrun: note: lookup resolved to: '/Applications/Xcode-6.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk'
xcrun: note: looking up SDK with '/Applications/Xcode-6.app/Contents/Developer/usr/bin/xcodebuild -sdk /Applications/Xcode-6.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk -version PlatformPath'
2015-09-25 11:00:15.708 xcodebuild[59636:8742811] [MT] PluginLoading: Required plug-in compatibility UUID 7FDF5C7A-131F-4ABB-9EDC-8C5F8F0B8A90 for plug-in at path '~/Library/Application Support/Developer/Sh

zwaldowski

// http://opensource.apple.com/source/CF/CF-1153.18/CFInternal.h

// Returns a generic dispatch queue for when you want to just throw some work
// into the concurrent pile to execute, and don't care about specifics except
// to match the QOS of the main thread.
CF_INLINE dispatch_queue_t __CFDispatchQueueGetGenericMatchingMain(void) {
    return dispatch_get_global_queue(qos_class_main(), DISPATCH_QUEUE_OVERCOMMIT);
}

// Returns a generic dispatch queue for when you want to just throw some work

zwaldowski

SWIFT_INCLUDE_PATHS = $(SRCROOT)

zwaldowski

protocol MyProtocol {}

protocol MyProtocolView: MyProtocol {

    var view: UIView { get }

}

extension MyProtocolView where Self: UIView {

zwaldowski

enum AddingError: ErrorType {
    case TooBig
}

let x = try? (0..<10000).reduce(0) {
    if $1 > 50 {
        throw AddingError.TooBig
    }
    return $0 + $1
}

zwaldowski

private extension JSON {
    
    init<Collection: CollectionType where Collection.Generator.Element == JSON>(_ collection: Collection) {
        self = .Array(Swift.Array(collection))
    }
    
    init<Dictionary: SequenceType where Dictionary.Generator.Element == (Swift.String, JSON)>(_ pairs: Dictionary) {
        var dictionary = Swift.Dictionary<Swift.String, JSON>(minimumCapacity: pairs.underestimateCount())
        for (key, value) in pairs {
            dictionary[key] = value

zwaldowski

    private func itemForQuery<T: AnyObject>(keychainQuery: KeychainAttributes, all: Bool = false, includeReferences: Bool = false) -> Result<T?, ErrorType> {
        let isData = T.self is NSData.Type
        precondition(!isData || !includeReferences, "Cannot get references when fetching data")

        let limitedQuery = keychainQuery + [
            kSecMatchLimit:          kSecMatchLimitAll,
            kSecReturnAttributes:    true,
            kSecReturnPersistentRef: includeReferences