Chris@16: // Copyright (C) 2005, Fernando Luis Cacciola Carballal.
Chris@16: //
Chris@16: // Use, modification, and distribution is subject to the Boost Software
Chris@16: // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: // See http://www.boost.org/libs/optional for documentation.
Chris@16: //
Chris@16: // You are welcome to contact the author at:
Chris@16: //  fernando_cacciola@hotmail.com
Chris@16: //
Chris@16: #ifndef BOOST_OPTIONAL_OPTIONAL_IO_FLC_19NOV2002_HPP
Chris@16: #define BOOST_OPTIONAL_OPTIONAL_IO_FLC_19NOV2002_HPP
Chris@16: 
Chris@101: #include <istream>
Chris@101: #include <ostream>
Chris@16: 
Chris@16: #include <boost/none.hpp>
Chris@16: #include "boost/optional/optional.hpp"
Chris@101: 
Chris@16: 
Chris@16: namespace boost
Chris@16: {
Chris@16: 
Chris@101: template<class CharType, class CharTrait>
Chris@101: inline
Chris@101: std::basic_ostream<CharType, CharTrait>&
Chris@101: operator<<(std::basic_ostream<CharType, CharTrait>& out, none_t const&)
Chris@101: {
Chris@101:   if (out.good())
Chris@101:   {
Chris@101:     out << "--";
Chris@101:   }
Chris@101:    
Chris@101:   return out;
Chris@101: }
Chris@101: 
Chris@16: template<class CharType, class CharTrait, class T>
Chris@16: inline
Chris@16: std::basic_ostream<CharType, CharTrait>&
Chris@16: operator<<(std::basic_ostream<CharType, CharTrait>& out, optional<T> const& v)
Chris@16: {
Chris@101:   if (out.good())
Chris@16:   {
Chris@101:     if (!v)
Chris@16:          out << "--" ;
Chris@16:     else out << ' ' << *v ;
Chris@16:   }
Chris@16: 
Chris@16:   return out;
Chris@16: }
Chris@16: 
Chris@16: template<class CharType, class CharTrait, class T>
Chris@16: inline
Chris@16: std::basic_istream<CharType, CharTrait>&
Chris@16: operator>>(std::basic_istream<CharType, CharTrait>& in, optional<T>& v)
Chris@16: {
Chris@16:   if (in.good())
Chris@16:   {
Chris@16:     int d = in.get();
Chris@16:     if (d == ' ')
Chris@16:     {
Chris@16:       T x;
Chris@16:       in >> x;
Chris@101: #ifndef  BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
Chris@101:       v = boost::move(x);
Chris@101: #else
Chris@16:       v = x;
Chris@101: #endif
Chris@16:     }
Chris@16:     else
Chris@16:     {
Chris@16:       if (d == '-')
Chris@16:       {
Chris@16:         d = in.get();
Chris@16: 
Chris@16:         if (d == '-')
Chris@16:         {
Chris@16:           v = none;
Chris@16:           return in;
Chris@16:         }
Chris@16:       }
Chris@16: 
Chris@16:       in.setstate( std::ios::failbit );
Chris@16:     }
Chris@16:   }
Chris@16: 
Chris@16:   return in;
Chris@16: }
Chris@16: 
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif
Chris@16: