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

   1 //
   2 // Copyright (c) 2019 Damian Jarek(damian.jarek93@gmail.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_CORE_DETAIL_CHAR_BUFFER_HPP
  11 #define BOOST_BEAST_CORE_DETAIL_CHAR_BUFFER_HPP
  12
  13 #include <boost/config.hpp>
  14 #include <cstddef>
  15 #include <cstring>
  16 #include <cstdint>
  17
  18 namespace boost {
  19 namespace beast {
  20 namespace detail {
  21
  22 template <std::size_t N>
  23 class char_buffer
  24 {
  25 public:
  26     bool try_push_back(char c)
  27     {
  28         if (size_ == N)
  29             return false;
  30         buf_[size_++] = c;
  31         return true;
  32     }
  33
  34     bool try_append(char const* first, char const* last)
  35     {
  36         std::size_t const n = last - first;
  37         if (n > N - size_)
  38             return false;
  39         std::memmove(&buf_[size_], first, n);
  40         size_ += n;
  41         return true;
  42     }
  43
  44     void clear() noexcept
  45     {
  46         size_ = 0;
  47     }
  48
  49     char* data() noexcept
  50     {
  51         return buf_;
  52     }
  53
  54     char const* data() const noexcept
  55     {
  56         return buf_;
  57     }
  58
  59     std::size_t size() const noexcept
  60     {
  61         return size_;
  62     }
  63
  64     bool empty() const noexcept
  65     {
  66         return size_ == 0;
  67     }
  68
  69 private:
  70     std::size_t size_= 0;
  71     char buf_[N];
  72 };
  73
  74 } // detail
  75 } // beast
  76 } // boost
  77
  78 #endif