# init(complexEquality:) Opts the executor into complex “same exclusive execution context” equality checks. ``` init(complexEquality executor: E) where E : SerialExecutor ``` ## Discussion This means what when asserting or assuming executors, and the current and expected executor are not the same instance (by object equality), the runtime may invoke `isSameExclusiveExecutionContext` in order to compare the executors for equality. Implementing such complex equality can be useful if multiple executor instances actually use the same underlying serialization context and can be therefore safely treated as the same serial exclusive execution context (e.g. multiple dispatch queues targeting the same serial queue). --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)