ceph/src/boost/boost/iostreams/filtering_stream.hpp

   1 // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
   2 // (C) Copyright 2004-2007 Jonathan Turkanis
   3 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   4 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
   5
   6 // See http://www.boost.org/libs/iostreams for documentation.
   7
   8 #ifndef BOOST_IOSTREAMS_FILTER_STREAM_HPP_INCLUDED
   9 #define BOOST_IOSTREAMS_FILTER_STREAM_HPP_INCLUDED
  10
  11 #if defined(_MSC_VER)
  12 # pragma once
  13 #endif
  14
  15 #include <memory>                                     // allocator.
  16 #include <boost/iostreams/detail/access_control.hpp>
  17 #include <boost/iostreams/detail/char_traits.hpp>
  18 #include <boost/iostreams/detail/iostream.hpp>        // standard streams.
  19 #include <boost/iostreams/detail/push.hpp>
  20 #include <boost/iostreams/detail/select.hpp>
  21 #include <boost/iostreams/detail/streambuf.hpp>       // pubsync.
  22 #include <boost/iostreams/filtering_streambuf.hpp>
  23 #include <boost/mpl/and.hpp>
  24 #include <boost/mpl/bool.hpp>
  25 #include <boost/static_assert.hpp>
  26 #include <boost/type_traits/is_convertible.hpp>
  27
  28 // Must come last.
  29 #include <boost/iostreams/detail/config/disable_warnings.hpp>  // MSVC.
  30
  31 namespace boost { namespace iostreams {
  32
  33 //--------------Definition of filtered_istream--------------------------------//
  34
  35 namespace detail {
  36
  37 template<typename Mode, typename Ch, typename Tr>
  38 struct filtering_stream_traits {
  39     typedef typename
  40             iostreams::select<  // Disambiguation for Tru64
  41                 mpl::and_<
  42                     is_convertible<Mode, input>,
  43                     is_convertible<Mode, output>
  44                 >,
  45                 BOOST_IOSTREAMS_BASIC_IOSTREAM(Ch, Tr),
  46                 is_convertible<Mode, input>,
  47                 BOOST_IOSTREAMS_BASIC_ISTREAM(Ch, Tr),
  48                 else_,
  49                 BOOST_IOSTREAMS_BASIC_OSTREAM(Ch, Tr)
  50             >::type stream_type;
  51     typedef typename
  52             iostreams::select< // Dismbiguation required for Tru64.
  53                 mpl::and_<
  54                     is_convertible<Mode, input>,
  55                     is_convertible<Mode, output>
  56                 >,
  57                 iostream_tag,
  58                 is_convertible<Mode, input>,
  59                 istream_tag,
  60                 else_,
  61                 ostream_tag
  62             >::type stream_tag;
  63 };
  64
  65 #if defined(BOOST_MSVC) && (BOOST_MSVC == 1700)
  66 # pragma warning(push)
  67 // https://connect.microsoft.com/VisualStudio/feedback/details/733720/
  68 # pragma warning(disable: 4250)
  69 #endif
  70
  71 template<typename Chain, typename Access>
  72 class filtering_stream_base
  73     : public access_control<
  74                  boost::iostreams::detail::chain_client<Chain>,
  75                  Access
  76              >,
  77       public filtering_stream_traits<
  78                  typename Chain::mode,
  79                  typename Chain::char_type,
  80                  typename Chain::traits_type
  81              >::stream_type
  82 {
  83 public:
  84     typedef Chain                                         chain_type;
  85     typedef access_control<
  86                  boost::iostreams::detail::chain_client<Chain>,
  87                  Access
  88              >                                            client_type;
  89 protected:
  90     typedef typename
  91             filtering_stream_traits<
  92                  typename Chain::mode,
  93                  typename Chain::char_type,
  94                  typename Chain::traits_type
  95             >::stream_type                                stream_type;
  96     filtering_stream_base() : stream_type(0) { this->set_chain(&chain_); }
  97 private:
  98     void notify() { this->rdbuf(chain_.empty() ? 0 : &chain_.front()); }
  99     Chain chain_;
 100 };
 101
 102 #if defined(BOOST_MSVC) && (BOOST_MSVC == 1700)
 103 # pragma warning(pop)
 104 #endif
 105
 106 } // End namespace detail.
 107
 108 //
 109 // Macro: BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(name_, chain_type_, default_char_)
 110 // Description: Defines a template derived from std::basic_streambuf which uses
 111 //      a chain to perform i/o. The template has the following parameters:
 112 //      Mode - the i/o mode.
 113 //      Ch - The character type.
 114 //      Tr - The character traits type.
 115 //      Alloc - The allocator type.
 116 //      Access - Indicates accessibility of the chain interface; must be either
 117 //          public_ or protected_; defaults to public_.
 118 // Macro parameters:
 119 //      name_ - The name of the template to be defined.
 120 //      chain_type_ - The name of the chain template.
 121 //      default_char_ - The default value for the char template parameter.
 122 //
 123 #define BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(name_, chain_type_, default_char_) \
 124     template< typename Mode, \
 125               typename Ch = default_char_, \
 126               typename Tr = BOOST_IOSTREAMS_CHAR_TRAITS(Ch), \
 127               typename Alloc = std::allocator<Ch>, \
 128               typename Access = public_ > \
 129     class name_ \
 130         : public boost::iostreams::detail::filtering_stream_base< \
 131                      chain_type_<Mode, Ch, Tr, Alloc>, Access \
 132                  > \
 133     { \
 134     public: \
 135         typedef Ch                                char_type; \
 136         struct category \
 137             : Mode, \
 138               closable_tag, \
 139               detail::filtering_stream_traits<Mode, Ch, Tr>::stream_tag \
 140             { }; \
 141         BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS(Tr) \
 142         typedef Mode                              mode; \
 143         typedef chain_type_<Mode, Ch, Tr, Alloc>  chain_type; \
 144         name_() { } \
 145         BOOST_IOSTREAMS_DEFINE_PUSH_CONSTRUCTOR(name_, mode, Ch, push_impl) \
 146         ~name_() { \
 147             if (this->is_complete()) \
 148                  this->rdbuf()->BOOST_IOSTREAMS_PUBSYNC(); \
 149         } \
 150     private: \
 151         typedef access_control< \
 152                     boost::iostreams::detail::chain_client< \
 153                         chain_type_<Mode, Ch, Tr, Alloc> \
 154                     >, \
 155                     Access \
 156                 > client_type; \
 157         template<typename T> \
 158         void push_impl(const T& t BOOST_IOSTREAMS_PUSH_PARAMS()) \
 159         { client_type::push(t BOOST_IOSTREAMS_PUSH_ARGS()); } \
 160     }; \
 161     /**/
 162
 163 #if defined(BOOST_MSVC) && (BOOST_MSVC == 1700)
 164 # pragma warning(push)
 165 // https://connect.microsoft.com/VisualStudio/feedback/details/733720/
 166 # pragma warning(disable: 4250)
 167 #endif
 168
 169 BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(filtering_stream, boost::iostreams::chain, char)
 170 BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(wfiltering_stream, boost::iostreams::chain, wchar_t)
 171
 172 #if defined(BOOST_MSVC) && (BOOST_MSVC == 1700)
 173 # pragma warning(pop)
 174 #endif
 175
 176 typedef filtering_stream<input>    filtering_istream;
 177 typedef filtering_stream<output>   filtering_ostream;
 178 typedef wfiltering_stream<input>   filtering_wistream;
 179 typedef wfiltering_stream<output>  filtering_wostream;
 180
 181 //----------------------------------------------------------------------------//
 182
 183 } } // End namespace iostreams, boost
 184
 185 #include <boost/iostreams/detail/config/enable_warnings.hpp> // MSVC
 186
 187 #endif // #ifndef BOOST_IOSTREAMS_FILTER_STREAM_HPP_INCLUDED