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/Src/Dependencies/Boost/boost/variant/detail/variant_io.hpp

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 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
23namespace 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< ... >, ... >)
32template <
33      BOOST_TEMPLATED_STREAM_ARGS(E,T)
34    BOOST_TEMPLATED_STREAM_COMMA
35      BOOST_VARIANT_ENUM_PARAMS(typename U)
36    >
37inline 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
42namespace detail { namespace variant {
43
44template <typename OStream>
45class printer
46    : public boost::static_visitor<>
47{
48private: // representation
49
50    OStream& out_;
51
52public: // structors
53
54    explicit printer(OStream& out)
55        : out_( out )
56    {
57    }
58
59public: // visitor interface
60
61    template <typename T>
62    void operator()(const T& operand) const
63    {
64        out_ << operand;
65    }
66
67private:
68    printer& operator=(const printer&);
69
70};
71
72}} // namespace detail::variant
73
74template <
75      BOOST_TEMPLATED_STREAM_ARGS(E,T)
76    BOOST_TEMPLATED_STREAM_COMMA
77      BOOST_VARIANT_ENUM_PARAMS(typename U)
78    >
79inline 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