class complex_data
{
   int               id_;
   char_string       char_string_;
   int_vector_vector int_vector_vector_;

   public:
   //Since void_allocator is convertible to any other allocator<T>, we can simplify
   //the initialization taking just one allocator for all inner containers.
   complex_data(int id, const char *name, const void_allocator &void_alloc)
      : id_(id), char_string_(name, void_alloc), int_vector_vector_(void_alloc)
   {}
   //Other members...
};