# dispatch_data_create_concat Returns a new dispatch data object consisting of the concatenated data from two other data objects. ``` extern dispatch_data_tdispatch_data_create_concat(dispatch_data_t data1, dispatch_data_t data2); ``` ## Parameters `data1` The first data object to include. The memory from this object is placed at the beginning of the new data object’s memory region. `data2` The second data object to include. The memory from this object is added to the end of the memory from `data1`. ## Return Value A new dispatch data object containing the concatenated memory. ## Discussion After calling this function, it is safe to release either of the objects in `data1` or `data2`. However, be aware that the memory from those objects may not be deallocated if the newly created dispatch data object references it, as opposed to copies it. --- 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)