From: basz@no.spam   
      
   On 04/26/2012 11:24 PM, Helmut Jarausch wrote:   
   > Hi,   
   >   
   > is there a recommend way to read from an ifstream if this is possibly   
   > empty?   
   >   
   > The simple way   
   >   
   >   std::ifstream  Inp("Empty");   
   >   
   >   if ( ! Inp ) {   
   >     cerr << "Open failed\n";   
   >     return 1;   
   >   }   
   >   
   >   int V;   
   >   
   >   while (Inp) {   
   >     cerr << "--- here with while ---\n";   
   >     Inp >> V;   
   >   }   
   >   
   > is invalid, since it enters the while loop at least once (for an empty   
   > file)   
   > The working alternative   
   >   
   >   while (Inp) {   
   >     if ( ! Inp ) break;   
   >    ....   
   >   }   
   >   
   > is ugly.   
   >   
   > Is there a recommended, readable way to do this?   
   >   
   > Many thanks for a hint,   
   > Helmut.   
      
      
   how about this:   
      
     ifstream is("empty.txt");   
     if(!is)   
     {   
       cerr << "Open failed\n";   
       return 1;   
     }   
      
     int tmp;   
     while(is && (is>>tmp))   
     {   
       cout << "--- here with while ---\n";   
       cout << tmp << endl;   
     }   
      
      
   --   
   pozdrawiam serdecznie / best regards,   
   bartek szurgot   
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