$ g++ -lpthread -c cppthread.c
cppthread.c: In static member function `static void* Thread::static_run(void*)':
cppthread.c:38: error: `void*' is not a pointer-to-object type
cppthread.c:38: error: cannot call member function `void* Thread::Arg() const' without object
---------------------------------------------------
#include <pthread.h>
class Thread
{
   public:
      Thread();
      virtual void run();
      virtual void stop();
      virtual bool running() const;
      virtual void join();
      static void sleep();
      virtual ~Thread();
      void Arg(void* a){Arg_ = a;};
   protected:
      static void *static_run(void*);
      virtual void *main(void*);
      void *Arg() const {return Arg_;}
   private:
   		Thread(const Thread&);
   		Thread& operator=(const Thread&);
      pthread_t tid;
      void *Arg_;

};

Thread::Thread() {}

void Thread::run()
{
   int code = pthread_create(&tid, NULL, &Thread::static_run, this);
   return;
}


/*static */
void * Thread::static_run(void* pthis)
{
   Thread *pt = (Thread*)pthis;
   return pthis->main(Arg());
}