# objc_copyProtocolList(_:) Returns an array of all the protocols known to the runtime. ``` func objc_copyProtocolList(_ outCount: UnsafeMutablePointer?) -> AutoreleasingUnsafeMutablePointer? ``` ## Parameters `outCount` Upon return, contains the number of protocols in the returned array. ## Return Value A C array of all the protocols known to the runtime. The array contains `*outCount` pointers followed by a `NULL` terminator. You must free the list with `free()`. ## Discussion This function acquires the runtime lock. --- 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)