ceph/src/boost/libs/iostreams/include/boost/iostreams/device/array.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_ARRAY_HPP_INCLUDED
   9 #define BOOST_IOSTREAMS_ARRAY_HPP_INCLUDED
  10
  11 #if defined(_MSC_VER)
  12 # pragma once
  13 #endif
  14
  15 #include <boost/config.hpp>         // BOOST_MSVC, make sure size_t is in std.
  16 #include <boost/detail/workaround.hpp>
  17 #include <cstddef>                  // std::size_t.
  18 #include <utility>                  // pair.
  19 #include <boost/iostreams/categories.hpp>
  20 #include <boost/preprocessor/cat.hpp>
  21 #include <boost/static_assert.hpp>
  22 #include <boost/type_traits/is_convertible.hpp>
  23 #include <boost/type_traits/is_same.hpp>
  24
  25 namespace boost { namespace iostreams {
  26
  27 namespace detail {
  28
  29 template<typename Mode, typename Ch>
  30 class array_adapter {
  31 public:
  32     typedef Ch                                 char_type;
  33     typedef std::pair<char_type*, char_type*>  pair_type;
  34     struct category
  35         : public Mode,
  36           public device_tag,
  37           public direct_tag
  38         { };
  39     array_adapter(char_type* begin, char_type* end);
  40     array_adapter(char_type* begin, std::size_t length);
  41     array_adapter(const char_type* begin, const char_type* end);
  42     array_adapter(const char_type* begin, std::size_t length);
  43     template<int N>
  44     array_adapter(char_type (&ar)[N])
  45         : begin_(ar), end_(ar + N)
  46         { }
  47     pair_type input_sequence();
  48     pair_type output_sequence();
  49 private:
  50     char_type* begin_;
  51     char_type* end_;
  52 };
  53
  54 } // End namespace detail.
  55
  56 #define BOOST_IOSTREAMS_ARRAY(name, mode) \
  57     template<typename Ch> \
  58     struct BOOST_PP_CAT(basic_, name) : detail::array_adapter<mode, Ch> { \
  59     private: \
  60         typedef detail::array_adapter<mode, Ch>  base_type; \
  61     public: \
  62         typedef typename base_type::char_type    char_type; \
  63         typedef typename base_type::category     category; \
  64         BOOST_PP_CAT(basic_, name)(char_type* begin, char_type* end) \
  65             : base_type(begin, end) { } \
  66         BOOST_PP_CAT(basic_, name)(char_type* begin, std::size_t length) \
  67             : base_type(begin, length) { } \
  68         BOOST_PP_CAT(basic_, name)(const char_type* begin, const char_type* end) \
  69             : base_type(begin, end) { } \
  70         BOOST_PP_CAT(basic_, name)(const char_type* begin, std::size_t length) \
  71             : base_type(begin, length) { } \
  72         template<int N> \
  73         BOOST_PP_CAT(basic_, name)(Ch (&ar)[N]) \
  74             : base_type(ar) { } \
  75     }; \
  76     typedef BOOST_PP_CAT(basic_, name)<char>     name; \
  77     typedef BOOST_PP_CAT(basic_, name)<wchar_t>  BOOST_PP_CAT(w, name); \
  78     /**/
  79 BOOST_IOSTREAMS_ARRAY(array_source, input_seekable)
  80 BOOST_IOSTREAMS_ARRAY(array_sink, output_seekable)
  81 BOOST_IOSTREAMS_ARRAY(array, seekable)
  82 #undef BOOST_IOSTREAMS_ARRAY
  83
  84
  85 //------------------Implementation of array_adapter---------------------------//
  86
  87 namespace detail {
  88
  89 template<typename Mode, typename Ch>
  90 array_adapter<Mode, Ch>::array_adapter
  91     (char_type* begin, char_type* end)
  92     : begin_(begin), end_(end)
  93     { }
  94
  95 template<typename Mode, typename Ch>
  96 array_adapter<Mode, Ch>::array_adapter
  97     (char_type* begin, std::size_t length)
  98     : begin_(begin), end_(begin + length)
  99     { }
 100
 101 template<typename Mode, typename Ch>
 102 array_adapter<Mode, Ch>::array_adapter
 103     (const char_type* begin, const char_type* end)
 104     : begin_(const_cast<char_type*>(begin)),  // Treated as read-only.
 105       end_(const_cast<char_type*>(end))       // Treated as read-only.
 106 { BOOST_STATIC_ASSERT((!is_convertible<Mode, output>::value)); }
 107
 108 template<typename Mode, typename Ch>
 109 array_adapter<Mode, Ch>::array_adapter
 110     (const char_type* begin, std::size_t length)
 111     : begin_(const_cast<char_type*>(begin)),       // Treated as read-only.
 112       end_(const_cast<char_type*>(begin) + length) // Treated as read-only.
 113 { BOOST_STATIC_ASSERT((!is_convertible<Mode, output>::value)); }
 114
 115 template<typename Mode, typename Ch>
 116 typename array_adapter<Mode, Ch>::pair_type
 117 array_adapter<Mode, Ch>::input_sequence()
 118 { BOOST_STATIC_ASSERT((is_convertible<Mode, input>::value));
 119   return pair_type(begin_, end_); }
 120
 121 template<typename Mode, typename Ch>
 122 typename array_adapter<Mode, Ch>::pair_type
 123 array_adapter<Mode, Ch>::output_sequence()
 124 { BOOST_STATIC_ASSERT((is_convertible<Mode, output>::value));
 125   return pair_type(begin_, end_); }
 126
 127 } // End namespace detail.
 128
 129 //----------------------------------------------------------------------------//
 130
 131 } } // End namespaces iostreams, boost.
 132
 133 #endif // #ifndef BOOST_IOSTREAMS_ARRAY_HPP_INCLUDED