title Platform::CallbackContext Enumeration | Microsoft Docs ms.custom ms.date 12/30/2016 ms.technology cpp-windows ms.topic reference f1_keywords VCCORLIB/Platform::CallbackContext dev_langs C++ helpviewer_keywords Platform::CallbackContext Enumeration ms.assetid 60e0c7cb-5d8f-482a-bdca-ca9335ae4899 author mikeblome ms.author mblome ms.workload cplusplus Platform::CallbackContext Enumeration Specifies the thread context in which a callback function (event handler) executes. Syntax enum class CallbackContext {}; Members Type Code Description Any The callback function can execute on any thread context. Same The callback function can execute on only the thread context that started the asynchronous operation. Requirements Minimum supported client: Windows 8 Minimum supported server: Windows Server 2012 Namespace: Platform Metadata: platform.winmd