Singleton* Singleton::instance() {
   if (pInstance == 0) {
      Lock lock;
      if (pInstance == 0) {
         pInstance = // Step 3
            operator new(sizeof(Singleton)); // Step 1
         new (pInstance) Singleton; // Step 2
      }
   }
   return pInstance;
}

Example 4: pInstance's initialization line expanded into three constituent tasks.