https://github.com/simonbs/proxymacro

Swift macro that proxies a value from one object to another.
https://github.com/simonbs/proxymacro

swift swift-macro swift-macros swiftmacro swiftmacros

Last synced: 2 months ago
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Swift macro that proxies a value from one object to another.

• Host: GitHub
• URL: https://github.com/simonbs/proxymacro
• Owner: simonbs
• Created: 2023-11-12T22:08:57.000Z (about 1 year ago)
• Default Branch: main
• Last Pushed: 2023-11-19T16:08:08.000Z (about 1 year ago)
• Last Synced: 2024-10-10T17:19:28.917Z (2 months ago)
• Topics: swift, swift-macro, swift-macros, swiftmacro, swiftmacros
• Language: Swift
• Homepage:
• Size: 17.6 KB
• Stars: 11
• Watchers: 2
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# ProxyMacro

Swift macro that proxies a property from one object to another.

```swift

final class MyObj {

    private final class StateStore {

      var number = 42

    }

    @Proxy(\Self.stateStore.number)

    var number: Int

    private let stateStore = StateStore()

}

```

This is useful when state needs to be kept in sync between multiple objects but we do not want to forward the state using `willSet`/`didSet`. In this case we pass the state store to the children instead. We can still expose the `number` property on `MyObj` and any reads and writes will be forwarded to the `number` propety on `StateStore`.

```swift

final class MyObj {

    private final class StateStore {

      var number = 42

    }

    @Proxy(\Self.stateStore.number)

    var number: Int

    private let stateStore = StateStore()

    private lazy var childA = Child(stateStore: stateStore)

    private lazy var childB = Child(stateStore: stateStore)

}

final class Child {

    private let stateStore: StateStore

    init(stateStore: StateStore) {

        self.stateStore = stateStore

    }

}

```