// 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 | |
#if defined __GNUC__ | |
# if (__GNUC__ == 2 && __GNUC_MINOR__ <= 97) | |
# define BOOST_OPTIONAL_NO_TEMPLATED_STREAMS | |
# endif | |
#endif // __GNUC__ | |
#if defined BOOST_OPTIONAL_NO_TEMPLATED_STREAMS | |
# include <iostream> | |
#else | |
# include <istream> | |
# include <ostream> | |
#endif | |
#include <boost/none.hpp> | |
#include <boost/assert.hpp> | |
#include "boost/optional/optional.hpp" | |
#include "boost/utility/value_init.hpp" | |
namespace boost | |
{ | |
#if defined (BOOST_NO_TEMPLATED_STREAMS) | |
template<class T> | |
inline std::ostream& operator<<(std::ostream& out, optional<T> const& v) | |
#else | |
template<class CharType, class CharTrait, class T> | |
inline | |
std::basic_ostream<CharType, CharTrait>& | |
operator<<(std::basic_ostream<CharType, CharTrait>& out, optional<T> const& v) | |
#endif | |
{ | |
if ( out.good() ) | |
{ | |
if ( !v ) | |
out << "--" ; | |
else out << ' ' << *v ; | |
} | |
return out; | |
} | |
#if defined (BOOST_NO_TEMPLATED_STREAMS) | |
template<class T> | |
inline std::istream& operator>>(std::istream& in, optional<T>& v) | |
#else | |
template<class CharType, class CharTrait, class T> | |
inline | |
std::basic_istream<CharType, CharTrait>& | |
operator>>(std::basic_istream<CharType, CharTrait>& in, optional<T>& v) | |
#endif | |
{ | |
if (in.good()) | |
{ | |
int d = in.get(); | |
if (d == ' ') | |
{ | |
T x; | |
in >> x; | |
v = x; | |
} | |
else | |
{ | |
if (d == '-') | |
{ | |
d = in.get(); | |
if (d == '-') | |
{ | |
v = none; | |
return in; | |
} | |
} | |
in.setstate( std::ios::failbit ); | |
} | |
} | |
return in; | |
} | |
} // namespace boost | |
#endif | |