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net/netip: clarify Addr.Is4In6 documentation

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For #65635

Change-Id: I4e4b0309d9139f970d6fd6b41303dfd2e0ec6236
Reviewed-on: https://go-review.googlesource.com/c/go/+/617835
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
This commit is contained in:
Damien Neil 2024-10-03 10:00:20 -07:00
parent fe87349002
commit b3312065ce
1 changed files with 3 additions and 1 deletions
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4
src/net/netip/netip.go
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@ -462,7 +462,9 @@ func (ip Addr) Is4() bool {
return ip.z == z4
}
// Is4In6 reports whether ip is an IPv4-mapped IPv6 address.
// Is4In6 reports whether ip is an "IPv4-mapped IPv6 address"
// as defined by RFC 4291.
// That is, it reports whether ip is in ::ffff:0:0/96.
func (ip Addr) Is4In6() bool {
return ip.Is6() && ip.addr.hi == 0 && ip.addr.lo>>32 == 0xffff
}