sl@0: // Copyright (C) 2005, Fernando Luis Cacciola Carballal.
sl@0: //
sl@0: // Use, modification, and distribution is subject to the Boost Software
sl@0: // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
sl@0: // http://www.boost.org/LICENSE_1_0.txt)
sl@0: //
sl@0: // See http://www.boost.org/lib/optional for documentation.
sl@0: //
sl@0: // You are welcome to contact the author at:
sl@0: //  fernando_cacciola@hotmail.com
sl@0: //
sl@0: #ifndef BOOST_OPTIONAL_OPTIONAL_IO_FLC_19NOV2002_HPP
sl@0: #define BOOST_OPTIONAL_OPTIONAL_IO_FLC_19NOV2002_HPP
sl@0: 
sl@0: #if defined __GNUC__
sl@0: #  if (__GNUC__ == 2 && __GNUC_MINOR__ <= 97) 
sl@0: #    define BOOST_OPTIONAL_NO_TEMPLATED_STREAMS
sl@0: #  endif
sl@0: #endif // __GNUC__
sl@0: 
sl@0: #if defined BOOST_OPTIONAL_NO_TEMPLATED_STREAMS
sl@0: #  include <iostream>
sl@0: #else 
sl@0: #  include <istream>
sl@0: #  include <ostream>
sl@0: #endif  
sl@0: 
sl@0: 
sl@0: #include "boost/optional/optional.hpp"
sl@0: #include "boost/utility/value_init.hpp"
sl@0: 
sl@0: namespace boost
sl@0: {
sl@0: 
sl@0: #if defined (BOOST_NO_TEMPLATED_STREAMS)
sl@0: template<class T>
sl@0: inline std::ostream& operator<<(std::ostream& out, optional<T> const& v)
sl@0: #else
sl@0: template<class CharType, class CharTrait, class T>
sl@0: inline
sl@0: std::basic_ostream<CharType, CharTrait>&
sl@0: operator<<(std::basic_ostream<CharType, CharTrait>& out, optional<T> const& v)
sl@0: #endif
sl@0: {
sl@0:   if ( out.good() )
sl@0:   {
sl@0:     if ( !v )
sl@0:          out << "--" ;
sl@0:     else out << ' ' << *v ;
sl@0:   }
sl@0: 
sl@0:   return out;
sl@0: }
sl@0: 
sl@0: #if defined (BOOST_NO_TEMPLATED_STREAMS)
sl@0: template<class T>
sl@0: inline std::istream& operator>>(std::istream& in, optional<T>& v)
sl@0: #else
sl@0: template<class CharType, class CharTrait, class T>
sl@0: inline
sl@0: std::basic_istream<CharType, CharTrait>&
sl@0: operator>>(std::basic_istream<CharType, CharTrait>& in, optional<T>& v)
sl@0: #endif
sl@0: {
sl@0:   if ( in.good() )
sl@0:   {
sl@0:     int d = in.get();
sl@0:     if ( d == ' ' )
sl@0:     {
sl@0:       T x ;
sl@0:       in >> x;
sl@0:       v = x ;
sl@0:     }
sl@0:     else
sl@0:       v = optional<T>() ;
sl@0:   }
sl@0: 
sl@0:   return in;
sl@0: }
sl@0: 
sl@0: } // namespace boost
sl@0: 
sl@0: #endif
sl@0: