//-----------------------------------------------------------------------------
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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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