compiler-error-c2384.md

description	title	ms.date	f1_keywords	helpviewer_keywords	ms.assetid
Learn more about: Compiler Error C2384	Compiler Error C2384	11/04/2016	C2384	C2384	8145f7ad-31b1-406d-ac43-0d557feab635

Compiler Error C2384

'member' : cannot apply __declspec(thread) to a member of a managed or WinRT class

The thread __declspec modifier cannot be used on a member of a managed or Windows Runtime class.

Static thread local storage in managed code can only be used for statically loaded DLLs—the DLL must be statically loaded when the process starts. Windows Runtime does not support thread local storage.

The following line generates C2384 and shows how to fix it in C++/CLI code:

// C2384.cpp
// compile with: /clr /c
public ref class B {
public:
   __declspec( thread ) static int tls_i = 1;   // C2384

   // OK - declare with attribute instead
   [System::ThreadStaticAttribute]
   static int tls_j;
};