typedef basic_ios
     
       > ios;typedef basic_streambuf
      
        > streambuf;typedef basic_istream
       
         > istream;typedef basic_ostream
        
          > ostream;typedef basic_iostream
         
           > iostream;typedef basic_stringbuf
          
           , allocator
           
             > stringbuf;typedef basic_istringstream
            
             , allocator
             
               > istringstream;typedef basic_ostringstream
              
               , allocator
               
                 > ostringstream;typedef basic_stringstream
                
                 , allocator
                 
                   > stringstream;typedef basic_filebuf
                  
                    > filebuf;typedef basic_ifstream
                   
                     > ifstream;typedef basic_ofstream
                    
                      > ofstream;typedef basic_fstream
                     
                       > fstream;