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

Write this way:

template  struct S {
    thread_local static int tlm;
};
template <> thread_local int S::tlm = 0; // "static" does not appear here

as stated in https://en.cppreference.com/w/cpp/language/storage_duration