// Copyright (C) 2005, Fernando Luis Cacciola Carballal.
//
// Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/lib/optional for documentation.
//
// You are welcome to contact the author at:
//  fernando_cacciola@hotmail.com
//
#ifndef BOOST_OPTIONAL_OPTIONAL_IO_FLC_19NOV2002_HPP
#define BOOST_OPTIONAL_OPTIONAL_IO_FLC_19NOV2002_HPP

#include<ostream>
#include<istream>


#include "boost/optional/optional.hpp"
#include "boost/utility/value_init.hpp"

namespace boost
{

template<class CharType, class CharTrait, class T>
inline
std::basic_ostream<CharType, CharTrait>&
operator<<(std::basic_ostream<CharType, CharTrait>& out, optional<T> const& v)
{
  if ( out.good() )
  {
    if ( !v )
         out << "--" ;
    else out << ' ' << *v ;
  }

  return out;
}

template<class CharType, class CharTrait, class T>
inline
std::basic_istream<CharType, CharTrait>&
operator>>(std::basic_istream<CharType, CharTrait>& in, optional<T>& v)
{
  if ( in.good() )
  {
    int d = in.get();
    if ( d == ' ' )
    {
      T x ;
      in >> x;
      v = x ;
    }
    else
      v = optional<T>() ;
  }

  return in;
}

} // namespace boost

#endif