boost::asio::read_until 不接受套接字作为参数

Question

I've read that you can use boost::asio::read_until to read from a socket, so I tried to do that:

using namespace boost::asio;
  ...
    boost::array<char, BUFFER_SIZE> buf;
    read_until(this->socket_opt.value(), buffer(buf), "\n");

But apparently, read_until cannot accept those arguments:

error: no matching function for call to ‘read_until(const boost::asio::basic_stream_socket<boost::asio::ip::tcp>&, boost::asio::mutable_buffers_1, const char [2])’
        read_until(this->socket_opt.value(), buffer(buf), "\n");

What am I doing wrong?

PS socket_opt is defined as std::optional<boost::asio::ip::tcp::socket> socket_opt and has a value at runtime.

Answer 1

boost::asio::read_until() requires dynamic buffer as second parameter.

I hope the following code helps you.

boost::asio::streambuf buf;
boost::asio::read_until(this->socket_opt.value(), buf, "\n");