Can you use thread local variables inside a class or structure

Question

Like this.

struct some_struct
{
 // Other fields
 .....
 __thread int tl;
}

I\'m trying to do that but the compiler is giving me this error

Answer 1

For C this makes not much sense, static (= global) members are only a feature of C++. And so the new C11 standard (that introduces _Thread_local) doesn't allow it. These beast are allowed basically everywhere were a variable with static storage duration is allowed.

For C++ this could make sense inside a class as analogous to a static member, but if this is allowed by C++11 I have no idea.