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:

std::experimental::net::ip::tcp::socket socket(io_context);
...
std::experimental::net::ip::v6_only option(true);
socket.set_option(option);

Getting the current option value:

std::experimental::net::ip::tcp::socket socket(io_context);
...
std::experimental::net::ip::v6_only option;
socket.get_option(option);
bool v6_only = option.value();