95 lines
1.8 KiB
C++
95 lines
1.8 KiB
C++
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// 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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#include <istream>
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#include <ostream>
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#include "boost/none.hpp"
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#include "boost/optional/optional.hpp"
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namespace boost
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{
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template<class CharType, class CharTrait>
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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, none_t)
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{
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if (out.good())
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{
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out << "--";
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}
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return out;
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}
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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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{
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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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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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{
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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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#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
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v = boost::move(x);
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#else
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v = x;
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#endif
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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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