:relfileprefix: ../../../
[#boost-urls-url-set_host_ipvfuture]

= xref:boost.adoc[pass:[boost]]::xref:boost/urls.adoc[pass:[urls]]::xref:boost/urls/url.adoc[pass:[url]]::set_host_ipvfuture


Set the host to an address


== Synopsis

Declared in header `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/url.hpp#L450[boost/url/url.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
xref:boost/urls/url.adoc[url]&
set_host_ipvfuture(core::string_view s);
----

== Description


The host is set to the specified IPvFuture
string.
The host type is
xref:boost/urls/host_type/ipvfuture.adoc[host_type::ipvfuture]
.

=== Example
[,cpp]
----
assert( url().set_host_ipvfuture( "v42.bis" ).buffer() == "//[v42.bis]" );
----

=== Complexity

Linear in `this-&gt;size() + s.size()`.

=== Postconditions
[,cpp]
----
this->has_authority() == true && this->host_ipvfuture) == s && this->host_type() == host_type::ipvfuture
----

=== Exception Safety

Strong guarantee.
Calls to allocate may throw.
Exceptions thrown on invalid input.

=== 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)]



== Exceptions

|===
| Name | Thrown on

| `system_error`
| 
`s` contains an invalid percent-encoding.

|===



== Parameters

|===
| Name | Description 

| *s*
| 
The string to set.

|===




== See Also


xref:boost/urls/url_base/set_encoded_host.adoc[set_encoded_host]
,
xref:boost/urls/url_base/set_encoded_host_address.adoc[set_encoded_host_address]
,
xref:boost/urls/url_base/set_encoded_host_name.adoc[set_encoded_host_name]
,
xref:boost/urls/url_base/set_host.adoc[set_host]
,
xref:boost/urls/url_base/set_host_address.adoc[set_host_address]
,
xref:boost/urls/url_base/set_host_ipv4.adoc[set_host_ipv4]
,
xref:boost/urls/url_base/set_host_ipv6.adoc[set_host_ipv6]
,
xref:boost/urls/url_base/set_host_name.adoc[set_host_name]
.