C++ and the Perils of Double-Checked Locking: Part II

if (pInstance == 0) {
   Lock lock;
   if (pInstance == 0) {
      Singleton* volatile temp =
         static_cast<Singleton*>(operator new(sizeof(Singleton)));
      temp->x = 5; // inlined Singleton constructor
      pInstance = temp;
   }
}

Example 8: Inlining the constructor in Example 7.