FM / optional

/usr/include/boost/optional

Name	Size	Mode	Actions
detail/	-	0755	rm
bad_optional_access.hpp	1015	0644	edit dl rm
optional.hpp	48112	0644	edit dl rm
optional_fwd.hpp	1157	0644	edit dl rm
optional_io.hpp	1768	0644	edit dl rm

Edit: /usr/include/boost/optional/optional_io.hpp (1768B)

#include <istream>
#include <ostream>

#include "boost/none.hpp"
#include "boost/optional/optional.hpp"

namespace boost
{

template<class CharType, class CharTrait>
inline
std::basic_ostream<CharType, CharTrait>&
operator<<(std::basic_ostream<CharType, CharTrait>& out, none_t)
{
  if (out.good())
  {
    out << "--";
  }
   
  return out;
}

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;
#ifndef  BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
      v = boost::move(x);
#else
      v = x;
#endif
    }
    else
    {
      if (d == '-')
      {
        d = in.get();

if (d == '-')
        {
          v = none;
          return in;
        }
      }

in.setstate( std::ios::failbit );
    }
  }

return in;
}

} // namespace boost

#endif

// 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/libs/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 #include #include "boost/none.hpp" #include "boost/optional/optional.hpp" namespace boost { template inline std::basic_ostream& operator<<(std::basic_ostream& out, none_t) { if (out.good()) { out << "--"; } return out; } template inline std::basic_ostream& operator<<(std::basic_ostream& out, optional const& v) { if (out.good()) { if (!v) out << "--" ; else out << ' ' << *v ; } return out; } template inline std::basic_istream& operator>>(std::basic_istream& in, optional& v) { if (in.good()) { int d = in.get(); if (d == ' ') { T x; in >> x; #ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES v = boost::move(x); #else v = x; #endif } else { if (d == '-') { d = in.get(); if (d == '-') { v = none; return in; } } in.setstate( std::ios::failbit ); } } return in; } } // namespace boost #endif