ceph/src/boost/boost/iostreams/stream_buffer.hpp

   1 // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
   2 // (C) Copyright 2003-2007 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_STREAM_BUFFER_HPP_INCLUDED
   9 #define BOOST_IOSTREAMS_STREAM_BUFFER_HPP_INCLUDED
  10
  11 #if defined(_MSC_VER)
  12 # pragma once
  13 #endif
  14
  15 #include <memory>            // allocator.
  16 #include <boost/config.hpp>  // BOOST_DEDUCED_TYPENAME.
  17 #include <boost/iostreams/detail/char_traits.hpp>
  18 #include <boost/iostreams/detail/config/overload_resolution.hpp>
  19 #include <boost/iostreams/detail/forward.hpp>
  20 #include <boost/iostreams/detail/ios.hpp>  // failure, streamsize.
  21 #include <boost/iostreams/detail/streambuf/direct_streambuf.hpp>
  22 #include <boost/iostreams/detail/streambuf/indirect_streambuf.hpp>
  23 #include <boost/iostreams/traits.hpp>
  24 #include <boost/static_assert.hpp>
  25 #include <boost/throw_exception.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 { namespace detail {
  32
  33 template<typename T, typename Tr, typename Alloc, typename Mode>
  34 struct stream_buffer_traits {
  35     typedef typename
  36             mpl::if_<
  37                 is_convertible<
  38                     BOOST_DEDUCED_TYPENAME category_of<T>::type,
  39                     direct_tag
  40                 >,
  41                 direct_streambuf<T, Tr>,
  42                 indirect_streambuf<T, Tr, Alloc, Mode>
  43             >::type type;
  44 };
  45
  46 } } } // End namespaces detail, iostreams, boost
  47
  48 #ifdef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION
  49 # include <boost/iostreams/detail/broken_overload_resolution/stream_buffer.hpp>
  50 #else
  51
  52 namespace boost { namespace iostreams {
  53
  54 template< typename T,
  55           typename Tr =
  56               BOOST_IOSTREAMS_CHAR_TRAITS(
  57                   BOOST_DEDUCED_TYPENAME char_type_of<T>::type
  58               ),
  59           typename Alloc =
  60               std::allocator<
  61                   BOOST_DEDUCED_TYPENAME char_type_of<T>::type
  62               >,
  63           typename Mode = BOOST_DEDUCED_TYPENAME mode_of<T>::type >
  64 class stream_buffer
  65     : public detail::stream_buffer_traits<T, Tr, Alloc, Mode>::type
  66 {
  67 private:
  68     BOOST_STATIC_ASSERT((
  69         is_convertible<
  70             BOOST_DEDUCED_TYPENAME iostreams::category_of<T>::type, Mode
  71         >::value
  72     ));
  73     typedef typename
  74             detail::stream_buffer_traits<
  75                 T, Tr, Alloc, Mode
  76             >::type                           base_type;
  77 public:
  78     typedef typename char_type_of<T>::type    char_type;
  79     struct category
  80         : Mode,
  81           closable_tag,
  82           streambuf_tag
  83         { };
  84     BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS(Tr)
  85 public:
  86     stream_buffer() { }
  87     ~stream_buffer()
  88     {
  89         try {
  90             if (this->is_open() && this->auto_close())
  91                 this->close();
  92         } catch (...) { }
  93     }
  94     BOOST_IOSTREAMS_FORWARD( stream_buffer, open_impl, T,
  95                              BOOST_IOSTREAMS_PUSH_PARAMS,
  96                              BOOST_IOSTREAMS_PUSH_ARGS )
  97     T& operator*() { return *this->component(); }
  98     T* operator->() { return this->component(); }
  99 private:
 100     void open_impl(const T& t BOOST_IOSTREAMS_PUSH_PARAMS())
 101         {   // Used for forwarding.
 102             if (this->is_open())
 103                 boost::throw_exception(
 104                     BOOST_IOSTREAMS_FAILURE("already open")
 105                 );
 106             base_type::open(t BOOST_IOSTREAMS_PUSH_ARGS());
 107         }
 108 };
 109
 110 } } // End namespaces iostreams, boost.
 111
 112 #endif // #ifdef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION
 113
 114 #include <boost/iostreams/detail/config/enable_warnings.hpp>  // MSVC.
 115
 116 #endif // #ifndef BOOST_IOSTREAMS_STREAM_BUFFER_HPP_INCLUDED