Will Owens ghthor

1. The Layer Tree

Core Animation's original name is Layer Kit

Core Animation is a compositing engine; its job is to compose different pieces of visual content on the screen, and to do so as fast as possible. The content in question is divided into individual layers stored in a hierarchy known as the layer tree. This tree forms the underpinning for all of UIKit, and for everything that you see on the screen in an iOS application.

In UIView, tasks such as rendering, layout and animation are all managed by a Core Animation class called CALayer. The only major feature of UIView that isn’t handled by CALayer is user interaction.

There are four hierarchies, each performing a different role:

Regular Colors

Value	Color
\e[0;30m	Black
\e[0;31m	Red
\e[0;32m	Green
\e[0;33m	Yellow
\e[0;34m	Blue
\e[0;35m	Purple

	#define _GNU_SOURCE
	#include <errno.h>
	#include <sched.h>
	#include <signal.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <sys/mount.h>
	#include <sys/stat.h>
	#include <sys/syscall.h>
	#include <sys/types.h>

	// insecure implementation, the session key cookie should be Secure and HttpOnly in a final version

	import (
	"database/sql"

	_ "github.com/lib/pq"
	)

	type DB struct {
	*sql.DB

	from evdev import UInput, ecodes as e
	import time

	# This class sends CTRL+SHIFT+U+<HEXCODE> sequences to produces arbitrary unicode characters.
	# It works fine on Gnome applications, but not on KDE
	# in https://en.wikipedia.org/wiki/Unicode_input#In_X11_.28Linux_and_other_Unix_variants.29
	class UnicodeInput:
	def __init__(self):
	keys = [
	e.KEY_LEFTCTRL,

	/*:
	## Phone Words

	Generate a collection of words that can be represented by a given phone number. If a phone number contains the digits `1` or `0` then split up the phone number and find the words for each of the substrings as long as each substring has more than one digit. Non-keypad characters can be ignored. Optionally, filter out words so that only dictionary words are present in the result.

	╔═════╦═════╦═════╗
	║ 1 ║ 2 ║ 3 ║
	║ ║ abc ║ def ║
	╠═════╬═════╬═════╣
	║ 4 ║ 5 ║ 6 ║

	// CalculatorView.swift
	// as seen in http://nshipster.com/ibinspectable-ibdesignable/
	//
	// (c) 2015 Nate Cook, licensed under the MIT license

	/// The alignment for drawing an String inside a bounding rectangle.
	enum NCStringAlignment {
	case LeftTop
	case CenterTop
	case RightTop

	func debounce( delay:NSTimeInterval, #queue:dispatch_queue_t, action: (()->()) ) -> ()->() {

	var lastFireTime:dispatch_time_t = 0
	let dispatchDelay = Int64(delay * Double(NSEC_PER_SEC))

	return {
	lastFireTime = dispatch_time(DISPATCH_TIME_NOW,0)
	dispatch_after(
	dispatch_time(
	DISPATCH_TIME_NOW,

	import Foundation

	var token: dispatch_once_t = 0
	func test() {
	dispatch_once(&token) {
	println("This is printed only on the first call to test()")
	}
	println("This is printed for each call to test()")
	}

	import Foundation

	go(println("in a thread"))

	// buffered channel
	var c = Chan(buffer:20)

	// sending routing
	go {
	while(true) {