[#boost-urls-authority_view-host_ipvfuture]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/authority_view.adoc[authority_view]::host_ipvfuture
:relfileprefix: ../../../
:mrdocs:


Return the host IPvFuture address

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/authority_view.hpp#L975[boost/url/authority_view.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
core::string_view
host_ipvfuture() const noexcept;
----

== Description


If the host type is xref:boost/urls/host_type.adoc[host_type::ipvfuture],        this function returns the address as        a string.        Otherwise, if the host type is not an        IPvFuture address, it returns an        empty string.


=== Example

[,cpp]
----
assert( url_view( "http://[v1fe.d:9]/index.htm" ).host_ipvfuture() == "v1fe.d:9" );
----

=== Complexity

Constant.


=== Exception Safety

Throws nothing.


=== BNF

[,cpp]
----
IPvFuture  = "v" 1*HEXDIG "." 1*( unreserved / sub-delims / ":" )
----

=== Specification

* link:https://datatracker.ietf.org/doc/html/rfc3986#section-3.2.2[3.2.2. Host (rfc3986)]





[.small]#Created with https://www.mrdocs.com[MrDocs]#