networkextension

func query(domain:String) ->[String] {
    var results:[String] = []
    //dispatch_async(q) { [weak self] in
    let host = CFHostCreateWithName(nil,domain as CFString).takeRetainedValue()
    //NSLog("getIPFromDNS %@", hostName)
    //let d = NSDate()
    
    CFHostStartInfoResolution(host, .addresses, nil)
    var success: DarwinBoolean = false
    if let addresses = CFHostGetAddressing(host, &success)?.takeUnretainedValue() as NSArray? {

networkextension

import Foundation
import Dispatch

func test(){
  for _ in 1..<5 {
    print("Hello, World!")
  }
}

class testclass{

networkextension

//: [Previous](@previous)

import Foundation

var str = "Hello, playground"

import Foundation

// Very slightly adapted from http://stackoverflow.com/a/30141700/106244
// 99.99% Credit to Martin R!

networkextension

import UIKit

var str = "Hello, playground"
let x = UINT32_MAX

print(Date())
let q = DispatchQueue.init(label: "test", qos: .background, attributes: .init(rawValue: 0), autoreleaseFrequency: .never, target: nil)
var flag = true
print(q.label)
q.asyncAfter(deadline: .now() + 3) {

networkextension

import Darwin

extension sockaddr_storage {

    /// Calls a closure with traditional BSD Sockets address parameters.
    ///
    /// This is used to call BSD Sockets routines like `connect`, which accept their 
    /// address as an `sa` and `saLen` pair.  For example:
    ///
    ///     let ss: sockaddr_storage = …

networkextension

import UIKit

class SFTargetAction: NSObject {
    var target:NSObject
    var action:Selector
    var event:UIControlEvents
    init(_ t:NSObject,a:String,e:UIControlEvents) {
        
        target = t
        action = NSSelectorFromString(a)

networkextension

import Cocoa

var str = "Hello, playground"

let x = UINT32_MAX

class FBQueue {
    typealias qblock = ((Void) ->Void)
    typealias qfinishBlock = ((Bool) ->Void)?
    let call:qblock

networkextension

//: Playground - noun: a place where people can play

import Cocoa

var str = "Hello, playground"

import Foundation
import Dispatch

func test(){

networkextension

let persons: [[String: Any]] = [["name": "Carl Saxon", "city": "New York, NY", "age": 44],
                                      ["name": "Travis Downing", "city": "El Segundo, CA", "age": 34],
                                      ["name": "Liz Parker", "city": "San Francisco, CA", "age": 32],
                                      ["name": "John Newden", "city": "New Jersey, NY", "age": 21],
                                      ["name": "Hector Simons", "city": "San Diego, CA", "age": 37],
                                      ["name": "Brian Neo", "age": 27]] //注意这家伙没有 city 键值
func infoFromState( state: String, persons: [[String: Any]])
    -> Int {
        // 先进行 flatMap 后进行 filter 筛选
        // $0["city"] 是一个可选值，对于那些没有 city 属性的项返回 nil

networkextension

class Number /* class cluser */ {
    class Int8: Number {
        var value: Swift.Int8
        init(_ value: Swift.Int8) { self.value = value }
    }
    class Int: Number {
        var value: Swift.Int
        init(_ value: Swift.Int) { self.value = value }
    }