Ole Begemann ole

## thirty-days-of-metal.md

      
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                ole
                / thirty-days-of-metal.md
            
            
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                Warren Moore – Thirty Days of Metal
              
          
    Warren Moore – Thirty Days of Metal

Great series of short articles introducing Apple's Metal framework.

2022-04-01: Day 1: Devices
2022-04-02: Day 2: Buffers
2022-04-03: Day 3: Commands
2022-04-04: Day 4: MTKView
2022-04-05: Day 5: Shaders
2022-04-06: Day 6: Pipelines


## swift-has-feature.sh
#!/bin/zsh

# Test if the Swift compiler knows about a particular language feature.
#
# Usage:
#
#     swift-has-feature [--swift SWIFT_PATH] [--language-version LANGUAGE_VERSION] FEATURE
#
# The feature should be an upcoming or experimental language feature,
# such as `"StrictConcurrency"` or `"ExistentialAny"`.

## Package.swift
// swift-tools-version: 6.0
// The swift-tools-version declares the minimum version of Swift required to build this package.

import PackageDescription

let package = Package(
    name: "MyPackage",
    products: [
        .library(name: "MyLibrary", targets: ["MyLibrary"]),
    ],

## !swiftui-reflection-dump.md

      
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                ole
                / !swiftui-reflection-dump.md
            
            
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              November 30, 2025 22:27
            
              
                A dump of the SwiftUI.framework binary for the iOS simulator (as of Xcode 12.0 beta 2) using the swift-reflection-dump tool.
              
          
    A dump of the SwiftUI.framework binary for the iOS simulator (as of Xcode 12.0 beta 2) using the swift-reflection-dump tool.
Note: I used a Swift 5.3 compiler build from a few weeks ago that I had laying around. Because of ABI stability, I don't think the swift-reflection-dump version has to match the compiler version that was used to build the binary, but I'm not 100% sure.

  
## update_storyboard_strings.sh
# (File moved to https://github.com/ole/Storyboard-Strings-Extraction)

## UserDefaultsAsyncSequence.swift
// UserDefaults KVO observation with AsyncSequence/AsyncStream
// Ole Begemann, 2023-04
// Updated for Swift 6, 2024-11
// https://gist.github.com/ole/fc5c1f4c763d28d9ba70940512e81916

import Foundation

// This is ugly, but UserDefaults is documented to be thread-safe, so this
// should be OK.
extension UserDefaults: @retroactive @unchecked Sendable {}

## XCTExpectation.swift
import XCTest

/// An expectation that is fulfilled when a Key Value Observing (KVO) condition
/// is met. It's variant of `XCTKVOExpectation` with support for native Swift
/// key paths.
final class KVOExpectation: XCTestExpectation {
    private var kvoToken: NSKeyValueObservation?

    /// Creates an expectation that is fulfilled when a KVO change causes the
    /// specified key path of the observed object to have an expected value.

## HeterogeneousDictionary.swift
// A heterogeneous dictionary with strong types in Swift, https://oleb.net/2022/heterogeneous-dictionary/
// Ole Begemann, April 2022

/// A key in a `HeterogeneousDictionary`.
public protocol HeterogeneousDictionaryKey {
  /// The "namespace" the key belongs to. Every `HeterogeneousDictionary` has its associated domain,
  /// and only keys belonging to that domain can be stored in the dictionary.
  associatedtype Domain
  /// The type of the values that can be stored under this key in the dictionary.
  associatedtype Value

## withSideActionAfterDelay.swift
/// Runs a secondary side action concurrently with a primary action.
/// The secondary action only starts after the specified delay.
///
/// Usage example: showing a progress indicator UI only if the primary action
/// takes a significant amount of time.
///
/// The secondary action runs in a child task (structured concurrency).
///
/// - Note: I'd like to provide a default argument for the clock: `clock: C = .continuous`,
///   like `Task.sleep` does. But this doesn't compile in Swift 6.2. Related bug report:

## swift-list-diagnostic-groups.sh
#!/bin/bash

# List Swift diagnostic groups.
#
# Author: Ole Begemann
#
# Usage:
#
#     swift-list-diagnostic-groups [version]     # default: main branch
#
	#!/bin/zsh

	# Test if the Swift compiler knows about a particular language feature.
	#
	# Usage:
	#
	# swift-has-feature [--swift SWIFT_PATH] [--language-version LANGUAGE_VERSION] FEATURE
	#
	# The feature should be an upcoming or experimental language feature,
	# such as `"StrictConcurrency"` or `"ExistentialAny"`.
	// swift-tools-version: 6.0
	// The swift-tools-version declares the minimum version of Swift required to build this package.

	import PackageDescription

	let package = Package(
	name: "MyPackage",
	products: [
	.library(name: "MyLibrary", targets: ["MyLibrary"]),
	],
	// UserDefaults KVO observation with AsyncSequence/AsyncStream
	// Ole Begemann, 2023-04
	// Updated for Swift 6, 2024-11
	// https://gist.github.com/ole/fc5c1f4c763d28d9ba70940512e81916

	import Foundation

	// This is ugly, but UserDefaults is documented to be thread-safe, so this
	// should be OK.
	extension UserDefaults: @retroactive @unchecked Sendable {}
	import XCTest

	/// An expectation that is fulfilled when a Key Value Observing (KVO) condition
	/// is met. It's variant of `XCTKVOExpectation` with support for native Swift
	/// key paths.
	final class KVOExpectation: XCTestExpectation {
	private var kvoToken: NSKeyValueObservation?

	/// Creates an expectation that is fulfilled when a KVO change causes the
	/// specified key path of the observed object to have an expected value.
	// A heterogeneous dictionary with strong types in Swift, https://oleb.net/2022/heterogeneous-dictionary/
	// Ole Begemann, April 2022

	/// A key in a `HeterogeneousDictionary`.
	public protocol HeterogeneousDictionaryKey {
	/// The "namespace" the key belongs to. Every `HeterogeneousDictionary` has its associated domain,
	/// and only keys belonging to that domain can be stored in the dictionary.
	associatedtype Domain
	/// The type of the values that can be stored under this key in the dictionary.
	associatedtype Value
	/// Runs a secondary side action concurrently with a primary action.
	/// The secondary action only starts after the specified delay.
	///
	/// Usage example: showing a progress indicator UI only if the primary action
	/// takes a significant amount of time.
	///
	/// The secondary action runs in a child task (structured concurrency).
	///
	/// - Note: I'd like to provide a default argument for the clock: `clock: C = .continuous`,
	/// like `Task.sleep` does. But this doesn't compile in Swift 6.2. Related bug report:
	#!/bin/bash

	# List Swift diagnostic groups.
	#
	# Author: Ole Begemann
	#
	# Usage:
	#
	# swift-list-diagnostic-groups [version] # default: main branch
	#