Allow values to be returned from withLock (#3154)

stephencelis · web-flow · commit 746126260841 · 2024-06-07T07:43:52.000-07:00
diff --git a/Sources/ComposableArchitecture/SharedState/Shared.swift b/Sources/ComposableArchitecture/SharedState/Shared.swift
@@ -67,8 +67,8 @@ public struct Shared<Value> {
   }
 
   /// Perform an operation on shared state with isolated access to the underlying value.
-  public func withLock(_ transform: @Sendable (inout Value) -> Void) {
-    transform(&self._wrappedValue)
+  public func withLock<R>(_ transform: @Sendable (inout Value) throws -> R) rethrows -> R {
+    try transform(&self._wrappedValue)
   }
 
   /// The underlying value referenced by the shared variable.

Original file line number	Diff line number	Diff line change
`@@ -67,8 +67,8 @@ public struct Shared<Value> {`
`67`	`67`	`}`
`68`	`68`
`69`	`69`	`/// Perform an operation on shared state with isolated access to the underlying value.`
`70`		`- public func withLock(_ transform: @Sendable (inout Value) -> Void) {`
`71`		`- transform(&self._wrappedValue)`
	`70`	`+ public func withLock<R>(_ transform: @Sendable (inout Value) throws -> R) rethrows -> R {`
	`71`	`+ try transform(&self._wrappedValue)`
`72`	`72`	`}`
`73`	`73`
`74`	`74`	`/// The underlying value referenced by the shared variable.`