projects / ceph.git / blame
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| 7c673cae FG |
1 | //----------------------------------------------------------------------------- |
| 2 | // boost variant/detail/variant_io.hpp header file | |
| 3 | // See http://www.boost.org for updates, documentation, and revision history. | |
| 4 | //----------------------------------------------------------------------------- | |
| 5 | // | |
| 6 | // Copyright (c) 2002-2003 | |
| 7 | // Eric Friedman, Itay Maman | |
| 8 | // | |
| 9 | // Distributed under the Boost Software License, Version 1.0. (See | |
| 10 | // accompanying file LICENSE_1_0.txt or copy at | |
| 11 | // http://www.boost.org/LICENSE_1_0.txt) | |
| 12 | ||
| 13 | #ifndef BOOST_VARIANT_DETAIL_VARIANT_IO_HPP | |
| 14 | #define BOOST_VARIANT_DETAIL_VARIANT_IO_HPP | |
| 15 | ||
| 16 | #include <iosfwd> // for std::basic_ostream forward declare | |
| 17 | ||
| 18 | #include <boost/variant/variant_fwd.hpp> | |
| 19 | ||
| 20 | #include <boost/detail/templated_streams.hpp> | |
| 21 | #include <boost/variant/static_visitor.hpp> | |
| 22 | ||
| 23 | namespace boost { | |
| 24 | ||
| 25 | /////////////////////////////////////////////////////////////////////////////// | |
| 26 | // function template operator<< | |
| 27 | // | |
| 28 | // Outputs the content of the given variant to the given ostream. | |
| 29 | // | |
| 30 | ||
| 31 | // forward declare (allows output of embedded variant< variant< ... >, ... >) | |
| 32 | template < | |
| 33 | BOOST_TEMPLATED_STREAM_ARGS(E,T) | |
| 34 | BOOST_TEMPLATED_STREAM_COMMA | |
| 35 | BOOST_VARIANT_ENUM_PARAMS(typename U) | |
| 36 | > | |
| 37 | inline BOOST_TEMPLATED_STREAM(ostream, E,T)& operator<<( | |
| 38 | BOOST_TEMPLATED_STREAM(ostream, E,T)& out | |
| 39 | , const variant< BOOST_VARIANT_ENUM_PARAMS(U) >& rhs | |
| 40 | ); | |
| 41 | ||
| 42 | namespace detail { namespace variant { | |
| 43 | ||
| 44 | template <typename OStream> | |
| 45 | class printer | |
| 46 | : public boost::static_visitor<> | |
| 47 | { | |
| 48 | private: // representation | |
| 49 | ||
| 50 | OStream& out_; | |
| 51 | ||
| 52 | public: // structors | |
| 53 | ||
| 54 | explicit printer(OStream& out) | |
| 55 | : out_( out ) | |
| 56 | { | |
| 57 | } | |
| 58 | ||
| 59 | public: // visitor interface | |
| 60 | ||
| 61 | template <typename T> | |
| 62 | void operator()(const T& operand) const | |
| 63 | { | |
| 64 | out_ << operand; | |
| 65 | } | |
| 66 | ||
| 67 | private: | |
| 68 | printer& operator=(const printer&); | |
| 69 | ||
| 70 | }; | |
| 71 | ||
| 72 | }} // namespace detail::variant | |
| 73 | ||
| 74 | template < | |
| 75 | BOOST_TEMPLATED_STREAM_ARGS(E,T) | |
| 76 | BOOST_TEMPLATED_STREAM_COMMA | |
| 77 | BOOST_VARIANT_ENUM_PARAMS(typename U) | |
| 78 | > | |
| 79 | inline BOOST_TEMPLATED_STREAM(ostream, E,T)& operator<<( | |
| 80 | BOOST_TEMPLATED_STREAM(ostream, E,T)& out | |
| 81 | , const variant< BOOST_VARIANT_ENUM_PARAMS(U) >& rhs | |
| 82 | ) | |
| 83 | { | |
| 84 | detail::variant::printer< | |
| 85 | BOOST_TEMPLATED_STREAM(ostream, E,T) | |
| 86 | > visitor(out); | |
| 87 | ||
| 88 | rhs.apply_visitor(visitor); | |
| 89 | ||
| 90 | return out; | |
| 91 | } | |
| 92 | ||
| 93 | } // namespace boost | |
| 94 | ||
| 95 | #endif // BOOST_VARIANT_DETAIL_VARIANT_IO_HPP |