jtbandes

//import Foundation
//class P: NSObject {}

protocol P {}
class C: P {}

extension SequenceType
{
    func mapAs<T>(type: T.Type) -> [T] {
        return map { $0 as! T }

jtbandes

class Base1 {
public:
    virtual void Foo() = 0;
};

class Base2 {
public:
    virtual void Bar() = 0;
};

jtbandes

// Suppose we want to convert argv/argc to a std::vector<std::string> for easier use.
// There are surprisingly many (and surprisingly concise) options:

// First pass:
vector<string> args;
for (int i = 1; i < argc; i++) {
    args.push_back(string(argv[i]));
}

// Minor improvement using emplace, which forwards the char* param directly to a string constructor:

jtbandes

// Would you rather use this:

NSLayoutConstraint(item: label, attribute: .Leading, relatedBy: .Equal, toItem: button, attribute: .Trailing, multiplier: 1, constant: 0).active = true

// or this?

label.constrain(.Leading, .Equal, to: button, .Trailing, plus: 20)

jtbandes

Values of macros from TargetConditionals.h.

Xcode 7 / iOS 9.1, tvOS 9.0, watchOS 2.0, OS X 10.11 SDKs

Macro	🖥	📱	📱sim	⌚️	⌚️sim	📺	📺sim
TARGET_OS_MAC	1	1	1	1	1	1	1
TARGET_OS_IPHONE	0	1	1	1	1	1	1
TARGET_OS_IOS	0	1	1	0	0	0	0
TARGET_OS_WATCH	0	0	0	1	1	0	0

jtbandes

var urlsToBlock = [
    // matches manifest.json
    "*://*.reddit.com/*"
];

function handleRequest(details) {
    return {cancel: true};
}

chrome.webRequest.onBeforeRequest.addListener(handleRequest, {"urls": urlsToBlock}, ["blocking"]);

jtbandes

import Control.Arrow ( (&&&) )
import qualified Control.Arrow ( first, second )
import Data.Maybe ( fromMaybe )

-- this also exists in Data.Graph.Inductive.Query.Monad
(><) :: (a -> c) -> (b -> d) -> (a, b) -> (c, d)
(><) f g = Control.Arrow.first f . Control.Arrow.second g

first :: [a] -> Maybe a
first [] = Nothing

jtbandes

/// Decodes a dynamically-generated Uniform Type Identifier for inspection purposes. (**NOT FOR PRODUCTION USE!**)
/// Many, many thanks to http://alastairs-place.net/blog/2012/06/06/utis-are-better-than-you-think-and-heres-why/
///
/// <https://developer.apple.com/library/ios/documentation/FileManagement/Conceptual/understanding_utis/understand_utis_conc/understand_utis_conc.html#//apple_ref/doc/uid/TP40001319-CH202-BCGCDHIJ>
func decodeDynUTI(_ uti: String) -> String?
{
    let vec = Array("abcdefghkmnpqrstuvwxyz0123456789")

    let encoded = Array(uti).suffix(from: 5)
    var result: [UInt8] = []

jtbandes

x: Bool?	false	x==nil	x==false	x!=true	x==true, x??false	x!=false, x??true	x!=nil	true
true?	false	false	false	false	true	true	true	true
false?	false	false	true	true	false	false	true	true
nil	false	true	false	true	false	true	false	true

jtbandes

extension NSTimer
{
    private class Trampoline
    {
        typealias Handler = @convention(block) (NSTimer) -> Void
        
        @objc static func handleTimer(timer: NSTimer) {
            let handler = unsafeBitCast(timer.userInfo, Handler.self)
            handler(timer)
        }