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98 lines
2.0 KiB
98 lines
2.0 KiB
// 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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