Keita Ito keitaito

Architecture

Offline Sync and Cache

📝 企業を調べる時のメモ書きです。

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Note: 📝

State of String: ABI, Performance, Ergonomics, and You!

Hello, I’ve been working on implementing, optimizing, and improving String in preparation for ABI stability, and I thought I’d share the current status of String in Swift 5 and some potential directions to go. This is the product of conversations with open source contributors and my colleagues on the Swift standard library team at Apple.

The primary area of focus is stabilizing String’s ABI, but we’d be remiss if we couldn’t also fit in performance and ergonomic improvements. String’s ergonomics in particular is one area where we think the status quo is woefully inadequate, and over half of this email is devoted to that topic. At the end, there’s a section about a community initiative that we hope can help users of String as well as guide future development.

(Note: I’m sending this to swift-dev because much of the contents revolve around implementation concerns. I’ll also cross-reference on swift-evolution and swift-users. See also the [StringManife

	@propertyWrapper
	class Box<T> {
	var wrappedValue: T

	var projectedValue: Box<T> {
	Box(wrappedValue)
	}

	init(_ value: T) {
	self.wrappedValue = value

	import UIKit
	import MobileCoreServices.UTCoreTypes

	if #available(iOS 14.1, *) {
	let input = Bundle.main.url(forResource: "IMG_0037", withExtension: "HEIC")!
	let output = FileManager().temporaryDirectory.appendingPathComponent("IMG_0037.GAIN_MAP.BMP")
	let source = CGImageSourceCreateWithURL(input as CFURL, nil)!

	// urn:com:apple:photo:2020:aux:hdrgainmap
	let dataInfo = CGImageSourceCopyAuxiliaryDataInfoAtIndex(source, 0, kCGImageAuxiliaryDataTypeHDRGainMap)! as Dictionary

	- (void)application:(UIApplication )application didRegisterForRemoteNotificationsWithDeviceToken:(NSData )deviceToken {
	NSString *tokenString;
	if (@available(iOS 13.0, *)) {
	NSUInteger dataLength = deviceToken.length;
	if (dataLength == 0) {
	return;
	}

	const unsigned char *dataBuffer = deviceToken.bytes;
	NSMutableString hexString = [NSMutableString stringWithCapacity:(dataLength 2)];

	func debounce<T>(delay: TimeInterval, function: @escaping (T) -> Void, complete: @escaping () -> Void = { }) -> (T) -> Void {
	let queue = DispatchQueue(label: "Debouncer")
	var current: DispatchWorkItem?

	return { input in
	current?.cancel()
	let new = DispatchWorkItem {
	function(input)
	complete()
	}

	#!/usr/bin/env sh

	set -e

	fancy_echo() {
	local fmt="$1"; shift

	printf "\n$fmt\n" "$@"
	}

	[
	{"url": "https://devstreaming-cdn.apple.com/videos/wwdc/2018/236mwbxbxjfsvns4jan/236/236_hd_avspeechsynthesizer_making_ios_talk.mp4?dl=1", "title": "AVSpeechSynthesizer: Making iOS Talk", "summary": "Speech can enhance the audio experience of your app, whether you are generating spoken feedback for accessibility, or providing critical information beyond simple alerts or notifications. AVSpeechSynthesizer produces synthesized speech from text and allows you to control and monitor the progress of ongoing speech. Learn the ins and outs of AVSpeechSynthesizer and how to add computer-generated speech output to your app."},
	{"url": "https://devstreaming-cdn.apple.com/videos/wwdc/2018/405bjty1j94taqv8ii/405/405_hd_measuring_performance_using_logging.mp4?dl=1", "title": "Measuring Performance Using Logging", "summary": "Learn how to use signposts and logging to measure performance. Understand how the Points of Interest instrument can be used to examine logged data. Get an introduction into creating and using custo

	import Foundation

	/// An abstract class that makes building simple asynchronous operations easy.
	/// Subclasses must override `main()` to perform any work and call `finish()`
	/// when they are done. All `NSOperation` work will be handled automatically.
	///
	/// Source/Inspiration: https://stackoverflow.com/a/48104095/116862 and https://gist.github.com/calebd/93fa347397cec5f88233
	open class AsyncOperation: Operation {
	public init(name: String? = nil) {
	super.init()