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/**
 Leveraging Swift's type system to represent the concept of an index type with a fixed size,
 so that iterating over all indices doesn't require a default case.
 */

/// The abstract properties of a fixed-size index type
protocol ExactNumberOfIndices: CaseIterable, RawRepresentable where RawValue == Int {}

/// A concrete fixed-size index type with 1 element (namely 0)
enum _1: Int, ExactNumberOfIndices {

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The problem

Consider two models defined like this:

struct User {
  let id: Int
  let name: String
  let email: String
}

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/*
In anticipation of iOS 13, I'm implementing Sign in with Apple.
To get started, I just made a simple VC that brings up the auth stuff, without even handling the result.

When running it in a simulator and completing the sign in process, the process appears to be broken:
- The auth controller is not dismissed
- `ASAuthorizationController`'s delegate method `authorizationController:didCompleteWithAuthorization` is not called

The code below is intended as a simple copy+paste to make problem replication easier:
1. Create a new XCode project

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/*
Given an array with optional sub-arrays, how can I flatten the array?

Example:

Given [[1, 2], nil, [3]]
Expect [1, 2, 3]

Solution:

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// Say you have a generic class with a couple of generic types, 
// that also takes a couple of parameters in its initializer:

class Foo<T, U, V> {
  init(label: String, other: Any) {
    // ...
  }
}

// Instantiating objects of this class in the standard way, while not unusual,

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//
//  TableviewDatasource.swift
//
//  Created by Phlippie Bosman on 2019/01/30.
//  Copyright © 2019 Kalido. All rights reserved.
//

import Reusable
import SwiftLCS

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/// Synched operations will only run one at a time.
/// The `operation` method is responsible for calling `complete` to notify the object when it is done.
final class SyncedOp {
    // Use a GCD Semaphore to synchronize flag access.
    private let semaphore = DispatchSemaphore(value: 1)
    
    private var isBusy = false
    private var isRetriggerQueued = false
    
    internal var operation: () -> () = {}

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/*
This code demonstrates a way to get UITableViewCells to resize
after their content size has changed, without needing to reload
the cells.

Prerequisites:
- The table view must be set up to calculate its cell heights dynamically; i.e.
  tableView.rowHeight = UITableView.automaticDimension
  tableView.estimatedRowHeight = 100 // or some good estimate
- The cell must be laid out using auto layout. Remember to add the subviews to 

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//
//  LightRibbon2.swift
//  Waveforms
//
//  Created by Phlippie Bosman on 2018/04/12.
//  Copyright © 2018 Phlippie Bosman. All rights reserved.
//

import UIKit

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# To get this:
# curl -Lo $HOME/.screenrc 'https://goo.gl/bZv3x2'

# Enable mouse scrolling:
termcapinfo xterm* ti@:te@

# Clear screen when vim/less/etc quits:
altscreen on

# Status line that shows windows: