| // 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 |
| |
| #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/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 |
| v = optional<T>() ; |
| } |
| |
| return in; |
| } |
| |
| } // namespace boost |
| |
| #endif |
| |