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‎.gitignore

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# Created by https://www.toptal.com/developers/gitignore/api/swift
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# Edit at https://www.toptal.com/developers/gitignore?templates=swift
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### Swift ###
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# Xcode
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#
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# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
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## User settings
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xcuserdata/
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## compatibility with Xcode 8 and earlier (ignoring not required starting Xcode 9)
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*.xcscmblueprint
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*.xccheckout
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## compatibility with Xcode 3 and earlier (ignoring not required starting Xcode 4)
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build/
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DerivedData/
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*.moved-aside
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*.pbxuser
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!default.pbxuser
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*.mode1v3
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!default.mode1v3
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*.mode2v3
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!default.mode2v3
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*.perspectivev3
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!default.perspectivev3
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## Obj-C/Swift specific
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*.hmap
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## App packaging
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*.ipa
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*.dSYM.zip
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*.dSYM
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## Playgrounds
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timeline.xctimeline
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playground.xcworkspace
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# Swift Package Manager
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# Add this line if you want to avoid checking in source code from Swift Package Manager dependencies.
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# Packages/
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# Package.pins
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# Package.resolved
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# *.xcodeproj
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# Xcode automatically generates this directory with a .xcworkspacedata file and xcuserdata
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# hence it is not needed unless you have added a package configuration file to your project
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# .swiftpm
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.build/
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# CocoaPods
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# We recommend against adding the Pods directory to your .gitignore. However
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# you should judge for yourself, the pros and cons are mentioned at:
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# https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
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# Pods/
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# Add this line if you want to avoid checking in source code from the Xcode workspace
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# *.xcworkspace
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# Carthage
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# Add this line if you want to avoid checking in source code from Carthage dependencies.
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# Carthage/Checkouts
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Carthage/Build/
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# Accio dependency management
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Dependencies/
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.accio/
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# fastlane
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# It is recommended to not store the screenshots in the git repo.
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# Instead, use fastlane to re-generate the screenshots whenever they are needed.
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# For more information about the recommended setup visit:
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# https://docs.fastlane.tools/best-practices/source-control/#source-control
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fastlane/report.xml
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fastlane/Preview.html
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fastlane/screenshots/**/*.png
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fastlane/test_output
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# Code Injection
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# After new code Injection tools there's a generated folder /iOSInjectionProject
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# https://github.com/johnno1962/injectionforxcode
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iOSInjectionProject/
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# End of https://www.toptal.com/developers/gitignore/api/swift
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*.xcodeproj/
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.DS_Store

‎.swiftpm/xcode/xcshareddata/xcschemes/UserDefaultsBacking.xcscheme

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<?xml version="1.0" encoding="UTF-8"?>
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<Scheme
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LastUpgradeVersion = "1210"
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version = "1.3">
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<BuildAction
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parallelizeBuildables = "YES"
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buildImplicitDependencies = "YES">
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<BuildActionEntries>
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<BuildActionEntry
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buildForTesting = "YES"
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buildForRunning = "YES"
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buildForProfiling = "YES"
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buildForArchiving = "YES"
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buildForAnalyzing = "YES">
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<BuildableReference
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BuildableIdentifier = "primary"
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BlueprintIdentifier = "UserDefaultsBacking"
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BuildableName = "UserDefaultsBacking"
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BlueprintName = "UserDefaultsBacking"
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ReferencedContainer = "container:">
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</BuildableReference>
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</BuildActionEntry>
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<BuildActionEntry
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buildForTesting = "YES"
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buildForRunning = "YES"
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buildForProfiling = "YES"
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buildForArchiving = "YES"
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buildForAnalyzing = "YES">
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<BuildableReference
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BuildableIdentifier = "primary"
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BlueprintIdentifier = "UserDefaultsBackingTests"
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BuildableName = "UserDefaultsBackingTests"
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BlueprintName = "UserDefaultsBackingTests"
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ReferencedContainer = "container:">
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</BuildableReference>
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</BuildActionEntry>
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</BuildActionEntries>
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</BuildAction>
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<TestAction
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buildConfiguration = "Debug"
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selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
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selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
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shouldUseLaunchSchemeArgsEnv = "YES">
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<Testables>
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<TestableReference
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skipped = "NO">
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<BuildableReference
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BuildableIdentifier = "primary"
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BlueprintIdentifier = "UserDefaultsBackingTests"
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BuildableName = "UserDefaultsBackingTests"
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BlueprintName = "UserDefaultsBackingTests"
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ReferencedContainer = "container:">
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</BuildableReference>
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</TestableReference>
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</Testables>
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</TestAction>
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<LaunchAction
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buildConfiguration = "Debug"
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selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
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selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
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launchStyle = "0"
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useCustomWorkingDirectory = "NO"
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ignoresPersistentStateOnLaunch = "NO"
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debugDocumentVersioning = "YES"
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debugServiceExtension = "internal"
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allowLocationSimulation = "YES">
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</LaunchAction>
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<ProfileAction
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buildConfiguration = "Release"
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shouldUseLaunchSchemeArgsEnv = "YES"
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savedToolIdentifier = ""
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useCustomWorkingDirectory = "NO"
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debugDocumentVersioning = "YES">
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<MacroExpansion>
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<BuildableReference
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BuildableIdentifier = "primary"
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BlueprintIdentifier = "UserDefaultsBacking"
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BuildableName = "UserDefaultsBacking"
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BlueprintName = "UserDefaultsBacking"
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ReferencedContainer = "container:">
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</BuildableReference>
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</MacroExpansion>
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</ProfileAction>
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<AnalyzeAction
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buildConfiguration = "Debug">
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</AnalyzeAction>
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<ArchiveAction
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buildConfiguration = "Release"
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revealArchiveInOrganizer = "YES">
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</ArchiveAction>
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</Scheme>

‎Package.swift

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// swift-tools-version:5.3
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// The swift-tools-version declares the minimum version of Swift required to build this package.
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import PackageDescription
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let package = Package(
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name: "UserDefaultsSnapshotLib",
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platforms: [.iOS(.v12)],
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products: [
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// Products define the executables and libraries a package produces, and make them visible to other packages.
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.library(
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name: "UserDefaultsSnapshotLib",
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targets: ["UserDefaultsSnapshotLib"]),
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],
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dependencies: [
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// Dependencies declare other packages that this package depends on.
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// .package(url: /* package url */, from: "1.0.0"),
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],
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targets: [
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// Targets are the basic building blocks of a package. A target can define a module or a test suite.
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// Targets can depend on other targets in this package, and on products in packages this package depends on.
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.target(
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name: "UserDefaultsSnapshotLib",
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dependencies: []),
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.testTarget(
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name: "UserDefaultsSnapshotLibTests",
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dependencies: ["UserDefaultsSnapshotLib"]),
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]
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)

‎README.md

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# UserDefaultsBacking
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A description of this package.

‎Sources/UserDefaultsSnapshotLib/UserDefaultsObject.swift

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/**
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Copyright 2020 Hiroshi Kimura
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Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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import Foundation
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open class UserDefaultsObject: Hashable {
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public static func == (lhs: UserDefaultsObject, rhs: UserDefaultsObject) -> Bool {
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lhs === rhs
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}
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public func hash(into hasher: inout Hasher) {
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ObjectIdentifier(self).hash(into: &hasher)
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}
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public let storage: [String : Any]
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private(set) var modified: [String : Any] = [:]
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public required init(
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snapshot: [String : Any]
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) {
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self.storage = snapshot
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}
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public func read<T: _UserDefaultsPrimitiveValueType>(type: T.Type? = nil, from key: String) -> T? {
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return (modified[key] as? T) ?? (storage[key] as? T)
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}
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public func write<T: _UserDefaultsPrimitiveValueType>(value: T?, for key: String) {
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guard let value = value else {
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modified[key] = NSNull()
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return
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}
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modified[key] = value
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}
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}
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extension UserDefaultsObject {
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@propertyWrapper
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public struct OptionalProperty<WrappedValue: _UserDefaultsPrimitiveValueType> {
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@available(*, unavailable)
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public var wrappedValue: WrappedValue? {
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get { fatalError() }
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set { fatalError() }
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}
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public let key: String
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public init(key: String) {
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self.key = key
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}
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public static subscript<Instance: UserDefaultsObject>(
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_enclosingInstance instance: Instance,
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wrapped wrappedKeyPath: KeyPath<Instance, WrappedValue?>,
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storage storageKeyPath: KeyPath<Instance, Self>
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) -> WrappedValue? {
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get {
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let storage = instance[keyPath: storageKeyPath]
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return instance.read(type: WrappedValue.self, from: storage.key)
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}
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set {
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let storage = instance[keyPath: storageKeyPath]
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instance.write(value: newValue, for: storage.key)
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}
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}
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}
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@propertyWrapper
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public struct Property<WrappedValue: _UserDefaultsPrimitiveValueType> {
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@available(*, unavailable)
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public var wrappedValue: WrappedValue {
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get { fatalError() }
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set { fatalError() }
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}
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public let key: String
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public let defaultValue: WrappedValue
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public init(wrappedValue: WrappedValue, key: String) {
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self.key = key
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self.defaultValue = wrappedValue
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}
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public static subscript<Instance: UserDefaultsObject>(
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_enclosingInstance instance: Instance,
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wrapped wrappedKeyPath: KeyPath<Instance, WrappedValue>,
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storage storageKeyPath: KeyPath<Instance, Self>
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) -> WrappedValue {
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get {
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let storage = instance[keyPath: storageKeyPath]
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return instance.read(type: WrappedValue.self, from: storage.key) ?? storage.defaultValue
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}
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set {
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let storage = instance[keyPath: storageKeyPath]
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instance.write(value: newValue, for: storage.key)
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}
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}
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}
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}

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