flatbuffers-visitor.cpp

    template <typename T>
    std::enable_if_t<std::is_base_of<flatbuffers::NativeTable, T>::value,
                     boost::system::error_code>
    operator() (tcp::socket& socket, Message::Header const& header, T& body,
                asio::yield_context ctx) const {
        boost::system::error_code ec;

        /* TODO: Inefficient and dangerous, huzzah! */
        std::vector<unsigned char> buffer;
        buffer.resize (header.size);

        asio::async_read (socket,
                          asio::buffer (buffer.data (), buffer.size ()),
                          asio::transfer_exactly (buffer.size ()),
                          ctx[ec]);
        if (ec) {
            return ec;
        }

        flatbuffers::Verifier fbv (buffer.data (), buffer.size ());
        if (!fbv.VerifyBuffer<typename T::TableType> ()) {
            throw std::runtime_error ("Couldn't verify flatbuffer");
        }

        auto root =
            flatbuffers::GetRoot<typename T::TableType> (buffer.data ());
        root->UnPackTo (&body);
        return ec;
    }