ceph/src/boost/boost/beast/core/detail/buffers_ref.hpp

   1 //
   2 // Copyright (c) 2016-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
   3 //
   4 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   5 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 //
   7 // Official repository: https://github.com/boostorg/beast
   8 //
   9
  10 #ifndef BOOST_BEAST_DETAIL_BUFFERS_REF_HPP
  11 #define BOOST_BEAST_DETAIL_BUFFERS_REF_HPP
  12
  13 #include <boost/beast/core/type_traits.hpp>
  14 #include <iterator>
  15
  16 namespace boost {
  17 namespace beast {
  18 namespace detail {
  19
  20 // A very lightweight reference to a buffer sequence
  21 template<class BufferSequence>
  22 class buffers_ref
  23 {
  24     BufferSequence const* buffers_;
  25
  26 public:
  27     using const_iterator = typename
  28         buffer_sequence_iterator<BufferSequence>::type;
  29
  30     using value_type = typename std::iterator_traits<
  31         const_iterator>::value_type;
  32
  33     buffers_ref(buffers_ref const&) = default;
  34     buffers_ref& operator=(buffers_ref const&) = default;
  35
  36     explicit
  37     buffers_ref(BufferSequence const& buffers)
  38         : buffers_(std::addressof(buffers))
  39     {
  40     }
  41
  42     const_iterator
  43     begin() const
  44     {
  45         return boost::asio::buffer_sequence_begin(*buffers_);
  46     }
  47
  48     const_iterator
  49     end() const
  50     {
  51         return boost::asio::buffer_sequence_end(*buffers_);
  52     }
  53 };
  54
  55 // Return a reference to a buffer sequence
  56 template<class BufferSequence>
  57 buffers_ref<BufferSequence>
  58 make_buffers_ref(BufferSequence const& buffers)
  59 {
  60     return buffers_ref<BufferSequence>(buffers);
  61 }
  62
  63 } // detail
  64 } // beast
  65 } // boost
  66
  67 #endif