Function const_buffer

include/boost/asio/buffer.hpp:282–288

#if defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING)
  const_buffer(const void* data, std::size_t size,
      boost::asio::detail::function<void()> debug_check)
    : data_(data),
      size_(size),
      debug_check_(debug_check)
  {
  }

  const boost::asio::detail::function<void()>& get_debug_check() const
  {