C++11 thread: start in constructor and join in destructor?

I am trying to declare C++11 thread as a class member, so that I can "assign" the function to begin execution, say in the constructor and I can join the thread in the destructor.

How would I go about this? I have declared the threads as members, but I am struggling with assigning the function for the thread to invoke?

Pseudo:

class X{
public:
    X(){  
        t1(&X::func, this);
        t2(&X::func, this);
    }

    ~X(){
        t1.join();
        t2.join();
    }

    void func(){
        //Does stuff
    }

   std::thread t1;
   std::thread t2;
};