[#boost-urls-url-set_host_ipvfuture]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/url.adoc[url]::set_host_ipvfuture
:relfileprefix: ../../../
:mrdocs:

Set the host to an address

== Synopsis

Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/url.hpp#L454[boost/url/url.hpp]>`

[source,cpp,subs="verbatim,replacements,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.adoc[`host_type::ipvfuture`].

== Example
[,cpp]
----
assert( url().set_host_ipvfuture( "v42.bis" ).buffer() == "//[v42.bis]" );
----
== Complexity
Linear in `this‐>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
* https://datatracker.ietf.org/doc/html/rfc3986#section-3.2.2[]

== Return Value

`*this`

== Parameters

[cols=2]
|===
| Name
| Description
| *s*
| The string to set.
|===

== See Also

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


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