8f510d17   
   From: bouncer@dev.null   
      
   Michael Kilburn wrote:   
      
   > On Jun 13, 11:51 am, Wil Evers  wrote:   
   >   
   >> Yes, the idea behind the usual workaround is to have a close()   
   >> member function that users who want an exception on an I/O error   
   >> from the underlying API should call before the object goes out of   
   >> scope.   
   >>   
   >> User code looks something like this:   
   >>   
   >>  void save()   
   >>  {   
   >>     outfile f(/* ctor args */);   
   >>     // ...write contents...   
   >>     f.close();   
   >>  }   
   >>   
   >> Since close() is never called from the stack unwinding machinery, it   
   >> can safely throw an exception.   
   >   
   > Let me change this sample for you:   
   >   
   > void save()   
   > {   
   >     outfile f(/* ctor args */);   
   >     // ...write contents...   
   >     if (...)   
   >        if (...) {...};   
   >        else { ...; f.close(); return; }   
   >     else   
   >        if (...) { ...; f.close(); return; }   
   >     /* etc */   
   >   
   >     f.close();   
   [snip]   
   > }   
      
   No, let's keep both.  Here's an edited version of yours, with the   
   problematic calls to f.close() removed, but still the same complicated   
   internal structure:   
      
   void write_contents(outfile& f)   
   {   
       if (...)   
          if (...) {...};   
          else { ...; return; }   
       else   
          if (...) { ...; return; }   
       /* etc */   
   }   
      
   And here's mine, slightly edited too.  It just calls yours:   
      
    void save()   
    {   
        outfile f(/* ctor args */);   
        write_contents(f);   
        f.close();   
    }   
      
   Do we really need a language change for this?  I rest my case.   
      
   Regards,   
      
   - Wil   
      
      
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