Re: [boost] Preminary submission: format3

From: Karl Nelson (kenelson_at_[hidden])
Date: 2002-02-19 11:59:27

> "Stewart, Robert" <stewart_at_[hidden]> writes:
> 
> |>  From: Peter Dimov [mailto:pdimov_at_[hidden]]
> |>  > Sent: Monday, February 11, 2002 12:03 PM
> |>  > From: "Karl Nelson" <kenelson_at_[hidden]>
> |>  > > Second, what is reasonable here?  Under Microsoft .Net they
> |>  > > allow the same argument to be used multiple times.  Or an
> |>  > > argument not to be used.  Should this be valid?
> 
> |>  > >    cout << format("%2$d %2$x", i, i);
> 
> |>  > Why not?
> 
> |>  It allows a class of errors -- accidentally referring to the second
> |>  argument both times, instead of both -- that it may be better to
> |>  prevent.
> 
> Correct.  I misread the statement in my previous response.  I thought
> that he was asking if we should allow passing the same argument (in this
> case, i) several times.
> 
> IMHO, the stricter the rules concerning the format, the better, because
> it increases the probability of catching an error by the translator.

Okay that sounds like a reasonable argument.  If you want the 
argument twice then place it in twice.  

   cout << format("foo %1% %2%", i, i);

--Karl