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### ip::v6_only

Socket option for determining whether an IPv6 socket supports IPv6 communication only.

    typedef implementation_defined v6_only;

Implements the IPPROTO_IPV6/IP_V6ONLY socket option.

##### Examples

Setting the option:

    boost::asio::ip::tcp::socket socket(io_service);
    ...
    boost::asio::ip::v6_only option(true);
    socket.set_option(option);

Getting the current option value:

    boost::asio::ip::tcp::socket socket(io_service);
    ...
    boost::asio::ip::v6_only option;
    socket.get_option(option);
    bool v6_only = option.value();