UDP Multicast – enable/disable loopback message on sending a message

bool EC_EnableMulticastLoopBack(SOCKET socket, bool IPv6, bool enable)
    // enable/disable loop
    char loop = enable ? 1 : 0;
    if (IPv6) {
        return setsockopt(socket, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &loop, sizeof(loop)) == 0;
    } else
        return setsockopt(socket, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)) == 0;
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