[boost] manipulators for filtering_stream s

From: Roland Schwarz (roland.schwarz_at_[hidden])
Date: 2008-03-01 05:58:33

Larry Evans wrote:
> A long time ago, I had one and was intending *eventually* to add it to
> iostreams, but never got around to it.  It's in:
> 
> http://svn.boost.org/trac/boost/browser/sandbox-branches/cppljevans/boost/io/filters

Thank you. Al though google revealed some postings about
margin_ostream it failed to get me to the sources.

I am not sure however you noticed the difference to my implementation:

I am storing state _in_ the stream, i.e. in ios base member and thus
allowing
out << indent_in << "blah blah\n";
out << "still indented\n";

And a function
void foo(ostream& os)

that gets passed down my indent_filter'ed stream still knowns
the indentation status.

The margin_ostream implements indent operation only the stream object.
Does is also have manipulators?

Will margin_ostream also work when downcasted to a plain ostream?

-- 
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