core/detail/char_buffer.hpp

0001 //
0002 // Copyright (c) 2019 Damian Jarek(damian.jarek93@gmail.com)
0003 //
0004 // Distributed under the Boost Software License, Version 1.0. (See accompanying
0005 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0006 //
0007 // Official repository: https://github.com/boostorg/beast
0008 //
0009
0010 #ifndef BOOST_BEAST_CORE_DETAIL_CHAR_BUFFER_HPP
0011 #define BOOST_BEAST_CORE_DETAIL_CHAR_BUFFER_HPP
0012
0013 #include <boost/config.hpp>
0014 #include <cstddef>
0015 #include <cstring>
0016 #include <cstdint>
0017
0018 namespace boost {
0019 namespace beast {
0020 namespace detail {
0021
0022 template <std::size_t N>
0023 class char_buffer
0024 {
0025 public:
0026     bool try_push_back(char c)
0027     {
0028         if (size_ == N)
0029             return false;
0030         buf_[size_++] = c;
0031         return true;
0032     }
0033
0034     bool try_append(char const* first, char const* last)
0035     {
0036         std::size_t const n = last - first;
0037         if (n > N - size_)
0038             return false;
0039         std::memmove(&buf_[size_], first, n);
0040         size_ += n;
0041         return true;
0042     }
0043
0044     void clear() noexcept
0045     {
0046         size_ = 0;
0047     }
0048
0049     char* data() noexcept
0050     {
0051         return buf_;
0052     }
0053
0054     char const* data() const noexcept
0055     {
0056         return buf_;
0057     }
0058
0059     std::size_t size() const noexcept
0060     {
0061         return size_;
0062     }
0063
0064     bool empty() const noexcept
0065     {
0066         return size_ == 0;
0067     }
0068
0069 private:
0070     std::size_t size_= 0;
0071     char buf_[N];
0072 };
0073
0074 } // detail
0075 } // beast
0076 } // boost
0077
0078 #endif