99 lines
2.1 KiB
C++
99 lines
2.1 KiB
C++
// Copyright (C) 2005, Fernando Luis Cacciola Carballal.
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//
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// Use, modification, and distribution is subject to the Boost Software
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/optional for documentation.
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//
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// You are welcome to contact the author at:
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// fernando_cacciola@hotmail.com
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//
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#ifndef BOOST_OPTIONAL_OPTIONAL_IO_FLC_19NOV2002_HPP
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#define BOOST_OPTIONAL_OPTIONAL_IO_FLC_19NOV2002_HPP
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#if defined __GNUC__
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# if (__GNUC__ == 2 && __GNUC_MINOR__ <= 97)
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# define BOOST_OPTIONAL_NO_TEMPLATED_STREAMS
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# endif
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#endif // __GNUC__
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#if defined BOOST_OPTIONAL_NO_TEMPLATED_STREAMS
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# include <iostream>
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#else
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# include <istream>
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# include <ostream>
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#endif
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#include <boost/none.hpp>
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#include <boost/assert.hpp>
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#include "boost/optional/optional.hpp"
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#include "boost/utility/value_init.hpp"
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namespace boost
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{
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#if defined (BOOST_NO_TEMPLATED_STREAMS)
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template<class T>
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inline std::ostream& operator<<(std::ostream& out, optional<T> const& v)
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#else
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template<class CharType, class CharTrait, class T>
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inline
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std::basic_ostream<CharType, CharTrait>&
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operator<<(std::basic_ostream<CharType, CharTrait>& out, optional<T> const& v)
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#endif
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{
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if ( out.good() )
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{
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if ( !v )
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out << "--" ;
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else out << ' ' << *v ;
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}
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return out;
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}
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#if defined (BOOST_NO_TEMPLATED_STREAMS)
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template<class T>
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inline std::istream& operator>>(std::istream& in, optional<T>& v)
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#else
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template<class CharType, class CharTrait, class T>
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inline
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std::basic_istream<CharType, CharTrait>&
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operator>>(std::basic_istream<CharType, CharTrait>& in, optional<T>& v)
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#endif
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{
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if (in.good())
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{
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int d = in.get();
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if (d == ' ')
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{
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T x;
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in >> x;
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v = x;
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}
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else
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{
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if (d == '-')
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{
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d = in.get();
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if (d == '-')
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{
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v = none;
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return in;
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}
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}
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in.setstate( std::ios::failbit );
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}
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}
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return in;
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}
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} // namespace boost
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#endif
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