:relfileprefix: ../../../
[#boost-urls-ipv4_address-is_unspecified]

== xref:boost.adoc[pass:[boost]]::xref:boost/urls.adoc[pass:[urls]]::xref:boost/urls/ipv4_address.adoc[pass:[ipv4_address]]::is_unspecified


Return true if the address is unspecified


=== Synopsis

Declared in header `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/ipv4_address.hpp#L232[boost/url/ipv4_address.hpp,window=blank_]>`

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