### 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:

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

Getting the current option value:

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

##### Requirements

Header: `asio/ip/v6_only.hpp`

Convenience header: `asio.hpp`