names=IPV6_LEAVE_GROUP
visibility=public
kind=defined

--- IPV6_LEAVE_GROUP -> Integer
Leave a multicast group。
[[m:BasicSocket#getsockopt]], [[m:BasicSocket#setsockopt]]
の第2引数(optname)に使用します。

@see [[m:Socket::Constants::IPPROTO_IPV6]],
     [[man:netinet/in.h(header)]], [[man:ip6(4freebsd)]], [[man:ipv6(7linux)]],
     [[RFC:3493]]

