# NSHashInsert(_:_:) Adds an element to the specified hash table. ``` func NSHashInsert(_ table: NSHashTable, _ pointer: UnsafeRawPointer?) ``` ## Discussion Inserts `pointer`, which must not be `NULL`, into `table`. If `pointer` matches an item already in the table, the previous pointer is released using the `release` callback function that was specified when the table was created. ## See Also [`NSHashInsertKnownAbsent(_:_:)`](/documentation/Foundation/NSHashInsertKnownAbsent(_:_:)) Adds an element to the specified hash table. [`NSHashRemove(_:_:)`](/documentation/Foundation/NSHashRemove(_:_:)) Removes an element from the specified hash table. [`NSHashInsertIfAbsent(_:_:)`](/documentation/Foundation/NSHashInsertIfAbsent(_:_:)) Adds an element to the specified hash table only if the table does not already contain the element. --- 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)