Michael mazz

Objective-C APIs can now express the “nullability” of parameters, return types, properties, variables, etc. For example, here is the expression of nullability for several UITableView APIs:

-(void)registerNib:(nonnull UINib *)nib forCellReuseIdentifier:(nonnull NSString *)identifier;
-(nullable UITableViewCell *)cellForRowAtIndexPath:(nonnull NSIndexPath)indexPath;
@property (nonatomic, readwrite, retain, nullable) UIView *backgroundView;

The nullability qualifiers affect the optionality of the Objective-C APIs when in Swift. Instead of being imported as implicitly-unwrapped optionals (e.g., UINib!), nonnull-qualified types are imported as non-optional (e.g., UINib) and nullable-qualified types are imported as optional (e.g., UITableViewCell?), so the above APIs will be seen in Swift as:

func registerNib(nib: UINib, forCellReuseIdentifier identifier: String)

TL;DR

Create a backup:

pg_dumpall > mybackup.sql

Perform the upgrade:

sudo pg_dropcluster 9.4 main --stop

This gist accompanies the blog post Building NSURL Queries with NSURLQueryItems and NSURLComponents.

	'''
	Easy Mac
	Copyright (2015) Sean Beck
	Licensed under Creative Commons Attribution-ShareAlike 4.0 International
	See: https://creativecommons.org/licenses/by-sa/4.0/

	Easily change your MAC address on Linux using `ifconfig`
	'''
	#!/usr/bin/python2.7

	import urllib3
	from urllib3 import HTTPSConnectionPool
	import certifi
	import base64
	import M2Crypto
	import hashlib


	class TestHTTPSConnectionPool(HTTPSConnectionPool):
	def _validate_conn(self, conn):

	#!/usr/sbin/dtrace -q -s
	/*
	Overly spammy, mostly covered by the other probes (every "read" or "write" is a "request")
	CFPreferencesServer$target:::request {
	printf("REQUEST from pid %d at %Y ( domain: %s, user: %s, host: %s, container: %s, managed: %d)\n", arg0, walltimestamp, copyinstr(arg1) != NULL ? copyinstr(arg1) : "(NULL)" ?: "(NULL)", copyinstr(arg2) != NULL ? copyinstr(arg2) : "(NULL)", copyinstr(arg3) != NULL ? copyinstr(arg3) : "(NULL)", copyinstr(arg4) != NULL ? copyinstr(arg4) : "(NULL)", arg5);
	}
	*/

	CFPreferencesServer$target:::write_rejected {
	printf("REJECTED WRITE OF KEY %s request from pid %d for reason %s at %Y ( domain: %s, user: %s, host: %s, container: %s)\n", copyinstr(arg1) != NULL ? copyinstr(arg1) : "(NULL)", arg0, copyinstr(arg6) != NULL ? copyinstr(arg6) : "(NULL)", walltimestamp, copyinstr(arg2) != NULL ? copyinstr(arg2) : "(NULL)", copyinstr(arg3) != NULL ? copyinstr(arg3) : "(NULL)", copyinstr(arg4) != NULL ? copyinstr(arg4) : "(NULL)", copyinstr(arg5) != NULL ? copyinstr(arg5)

	# Be sure to save your config files. Optional but I do:
	sudo cp /etc/postgresql/9.3/main/postgresql.conf ~
	sudo cp /etc/postgresql/9.3/main/pg_hba.conf ~

	# Package repo (for apt-get)
	wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc \| sudo apt-key add -
	sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt/ precise-pgdg main" >> /etc/apt/sources.list.d/postgresql.list'

	# Also probably optional but I like to update sources and upgrade
	sudo apt-get update

	import AVFoundation
	import Foundation

	// The maximum number of audio buffers in flight. Setting to two allows one
	// buffer to be played while the next is being written.
	private let kInFlightAudioBuffers: Int = 2

	// The number of audio samples per buffer. A lower value reduces latency for
	// changes but requires more processing but increases the risk of being unable
	// to fill the buffers in time. A setting of 1024 represents about 23ms of

	# DUBSTEP
	# Combines ideas from my other gists
	current_bpm = 140.0
	use_bpm current_bpm

	# WOBBLE BASS
	define :wob do
	use_synth :dsaw
	lowcut = note(:E1) # ~ 40Hz
	highcut = note(:G8) # ~ 3000Hz

	# Video of it in action: http://cl.ly/VSIF

	class MyScene < SKScene
	def scroll_action(x, duration)
	width = (x * 2)
	move = SKAction.moveByX(-width, y: 0, duration: duration * width)
	reset = SKAction.moveByX(width, y: 0, duration: 0)

	SKAction.repeatActionForever(SKAction.sequence([move, reset]))
	end