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#include <istream> #include <ostream> #include <boost/optional/optional.hpp> namespace boost { template <class CharType, class CharTrait, class T> std::basic_ostream<CharType, CharTrait>& operator<<(std::basic_ostream<CharType, CharTrait>& out, optional<T> const& v);template <class CharType, class CharTrait> std::basic_ostream<CharType, CharTrait>& operator<<(std::basic_ostream<CharType, CharTrait>& out, none_t const&);
template<class CharType, class CharTrait, class T> std::basic_istream<CharType, CharTrait>& operator>>(std::basic_istream<CharType, CharTrait>& in, optional<T>& v);
} // namespace boost