Re: [boost] manipulators for filtering_stream s

From: Larry Evans (cppljevans_at_[hidden])
Date: 2008-02-29 12:22:44

On 02/29/08 09:32, Roland Schwarz wrote:
> Surprisingly I was not able to find on the net
> code that would give me a smart way to indent
> a stream. So I wrote a little filter based on
> the boost iostreams library.

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

It was used, with g++'s demangler and boost's spirit, to produce more
readable demangled names as demonstrated by:

http://sourceforge.net/mailarchive/message.php?msg_id=fmqia0%24kak%241%40ger.gmane.org

OOPS.  It doesn't appear the way it should there, but it did appear 
properly indented in my mail reader.  In short, the stream has an 
operator++ and operator-- as well as operator+= and operator-= which
increment the indentation and decrement the indentation.  I've attached
the spirit code which, given the demangled name from g++'s demangler,
produces the indented output.  The indentable stream is the

   str_tree_type_name_parser_print::my_out

member variable.