id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
13461	C++ Boost UDP multicast errors out with socket.set_option()	nguyen.tnhoang@…	chris_kohlhoff	"I am following an example of Boost UDP multicast sending and receiving  here(https://stackoverflow.com/questions/12708558/c-multiple-multicast-receiver-with-boost-asio/12749727#12749727).  I make some modifications to predefine IP and port:

#include <ctime>
#include <iostream>
#include <string>
#include <boost/array.hpp>
#include <boost/bind.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/asio.hpp>
#include <boost/lexical_cast.hpp>
#include <boost/thread.hpp>
using boost::asio::ip::udp;
using std::cout;
using std::cin;
using std::endl;

void read(boost::asio::ip::udp::socket& socket)
{
	boost::asio::ip::udp::endpoint sender;
	std::vector<char> buffer;
	std::size_t bytes_readable = 0;
	for (int i = 0; i < 3; ++i)
	{
		// Poll until data is available.
		while (!bytes_readable)
		{
			// Issue command to socket to get number of bytes readable.
			boost::asio::socket_base::bytes_readable num_of_bytes_readable(true);
			socket.io_control(num_of_bytes_readable);

			// Get the value from the command.
			bytes_readable = num_of_bytes_readable.get();

			// If there is no data available, then sleep.
			if (!bytes_readable)
			{
				boost::this_thread::sleep(boost::posix_time::seconds(1));
			}
		}

		// Resize the buffer to store all available data.
		buffer.resize(bytes_readable);

		// Read available data.
		socket.receive_from(
			boost::asio::buffer(buffer, bytes_readable),
			sender);

		// Extract data from the buffer.
		std::string message(buffer.begin(), buffer.end());

		// Output data.
		std::cout << ""Received message: "";
		std::cout << message << std::endl;
	}
}

void write(boost::asio::ip::udp::socket& socket, boost::asio::ip::udp::endpoint& destination)
{
	std::string message;
	for (unsigned int i = 0; i < 3; ++i)
	{
		std::ostringstream stream;
		stream << i;
		message = stream.str();
		socket.send_to(boost::asio::buffer(message), destination);
		std::cout << ""Sent message: "" << message << std::endl;
	}
}

int main()
{
	// ============================================================================================================
	bool receiver = false;
	boost::asio::ip::address address = boost::asio::ip::address::from_string(""127.0.0.1"");
	unsigned short port = boost::lexical_cast<unsigned short>(""13"");

	// Create socket.
	using boost::asio::ip::udp;
	boost::asio::io_service service;
	udp::socket socket(service);
	socket.open(boost::asio::ip::udp::v4());

	// Allow other processes to reuse the address, permitting other processes on
	// the same machine to use the multicast address.
	socket.set_option(udp::socket::reuse_address(true));

	// Guarantee the loopback is enabled so that multiple processes on the same
	// machine can receive data that originates from the same socket.
	socket.set_option(boost::asio::ip::multicast::enable_loopback(true));
	socket.bind(udp::endpoint(boost::asio::ip::address_v4::any(), port));
	udp::endpoint destination(address, port);

	// Join group.
	namespace ip = boost::asio::ip;
	socket.set_option(ip::multicast::join_group(address));
	// Start read or write loops based on command line options.
	if (receiver) read(socket);
	else          write(socket, destination);

	return 0;
}

An error is thrown here:

    socket.set_option(ip::multicast::join_group(address));
with this detail:

Microsoft C++ exception: boost::exception_detail::clone_impl > at memory location 0x0040F470. occurred

Can someone please tell me what went wrong? Thanks."	Bugs	new	To Be Determined	asio	Boost 1.66.0	Showstopper		udp multicast set_option