//demonstrate use of indent_ostream with Struct s from post:
/*  
From: dherring@ll.mit.edu
Newsgroups: gmane.comp.lib.boost.devel
Subject: Re: [iostreams]ANNOUNCE:indent_filtering_ostream.zip in
 vault
Date: Wed, 13 Jan 2010 12:17:50 -0500 (EST)
Lines: 104
*/
#include <boost/iostreams/utility/indent_ostream.hpp>
#include <iostream>
#include <vector>

// code oblivious to indentation
std::ostream & operator<<(std::ostream &os, std::vector<int>const& v)
{
  os<<"vector<int>"<<indent_in;
  unsigned const n=v.size();
  for(unsigned i=0; i<n;++i)
  {
    os << "\n" << v[i]; 
  }
  os<<indent_out;
  return os;
}

struct Struct
{
    int x;
    std::vector<int> v;
    int y;
    Struct(void)
    : x(5)
    , v({1,2,3})
    , y(6)
    {}
};
std::ostream & operator<<(std::ostream &os, Struct const& s)
{
  os<<"Struct";
  os<<indent_in;
  os<<"\n"<<"x="<<s.x;
  os<<"\n"<<"v="<<s.v;
  os<<"\n"<<"y="<<s.y;
  os<<indent_out;
  return os;
}
int main(void)
{
; boost::iostreams::indent_ostream<> mout(std::cout)
; Struct s;
; mout<<"{\n"
; mout<<s<<"\n";
; mout<<"}\n";
; return 0
;}