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[#A203BFA7746CCBBE994790418DDF894F9A7D9802]

= Function ipv6_address::is_unspecified

pass:v,q[Return true if the address is unspecified]


== Synopsis

Declared in header `</boost/url/ipv6_address.hpp#L261[boost/url/ipv6_address.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
bool
is_unspecified() const noexcept;
----

== Description

pass:v,q[The address 0:0:0:0:0:0:0:0 is called the] pass:v,q[unspecified address. It indicates the]
pass:v,q[absence of an address.]

=== Specification

* link:https://datatracker.ietf.org/doc/html/rfc4291#section-2.5.2[            2.5.2. The Unspecified Address (rfc4291)]



== Return Value

* `bool`