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95 lines
2.3 KiB
95 lines
2.3 KiB
//----------------------------------------------------------------------------- |
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// boost variant/detail/variant_io.hpp header file |
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// See http://www.boost.org for updates, documentation, and revision history. |
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//----------------------------------------------------------------------------- |
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// |
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// Copyright (c) 2002-2003 |
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// Eric Friedman, Itay Maman |
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// |
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// Distributed under the Boost Software License, Version 1.0. (See |
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// 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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#ifndef BOOST_VARIANT_DETAIL_VARIANT_IO_HPP |
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#define BOOST_VARIANT_DETAIL_VARIANT_IO_HPP |
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#include <iosfwd> // for std::basic_ostream forward declare |
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#include "boost/variant/variant_fwd.hpp" |
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#include "boost/detail/templated_streams.hpp" |
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#include "boost/variant/static_visitor.hpp" |
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namespace boost { |
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/////////////////////////////////////////////////////////////////////////////// |
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// function template operator<< |
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// |
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// Outputs the content of the given variant to the given ostream. |
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// |
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// forward declare (allows output of embedded variant< variant< ... >, ... >) |
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template < |
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BOOST_TEMPLATED_STREAM_ARGS(E,T) |
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BOOST_TEMPLATED_STREAM_COMMA |
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BOOST_VARIANT_ENUM_PARAMS(typename U) |
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> |
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inline BOOST_TEMPLATED_STREAM(ostream, E,T)& operator<<( |
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BOOST_TEMPLATED_STREAM(ostream, E,T)& out |
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, const variant< BOOST_VARIANT_ENUM_PARAMS(U) >& rhs |
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); |
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namespace detail { namespace variant { |
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template <typename OStream> |
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class printer |
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: public boost::static_visitor<> |
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{ |
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private: // representation |
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OStream& out_; |
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public: // structors |
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explicit printer(OStream& out) |
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: out_( out ) |
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{ |
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} |
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public: // visitor interface |
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template <typename T> |
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void operator()(const T& operand) const |
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{ |
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out_ << operand; |
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} |
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private: |
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printer& operator=(const printer&); |
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}; |
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}} // namespace detail::variant |
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template < |
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BOOST_TEMPLATED_STREAM_ARGS(E,T) |
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BOOST_TEMPLATED_STREAM_COMMA |
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BOOST_VARIANT_ENUM_PARAMS(typename U) |
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> |
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inline BOOST_TEMPLATED_STREAM(ostream, E,T)& operator<<( |
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BOOST_TEMPLATED_STREAM(ostream, E,T)& out |
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, const variant< BOOST_VARIANT_ENUM_PARAMS(U) >& rhs |
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) |
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{ |
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detail::variant::printer< |
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BOOST_TEMPLATED_STREAM(ostream, E,T) |
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> visitor(out); |
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rhs.apply_visitor(visitor); |
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return out; |
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} |
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} // namespace boost |
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#endif // BOOST_VARIANT_DETAIL_VARIANT_IO_HPP
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