Returns `boost::asio::streambuf` contents represented as `std::string`

boost_asio_streambuf_to_string.cpp

std::string buffer_to_string(const boost::asio::streambuf &buffer)
{
  using boost::asio::buffers_begin;
  
  auto bufs = buffer.data();
  std::string result(buffers_begin(bufs), buffers_begin(bufs) + buffer.size());
  return result;
}