[#boost-urls-url_base-set_host_ipvfuture]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/url_base.adoc[url&lowbar;base]::set&lowbar;host&lowbar;ipvfuture
:relfileprefix: ../../../
:mrdocs:

Set the host to an address

== Synopsis

Declared in `&lt;https://www.github.com/boostorg/url/blob/develop/include/boost/url/url_base.hpp#Lundefined[boost&sol;url&sol;url&lowbar;base&period;hpp]&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/url_base.adoc[url&lowbar;base]&
set&lowbar;host&lowbar;ipvfuture(core::string&lowbar;view s);
----

== Description

The host is set to the specified IPvFuture string&period; The host type is xref:boost/urls/host_type.adoc[`host&lowbar;type&colon;&colon;ipvfuture`]&period;

== Example

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

Linear in `this&hyphen;&gt;size() &plus; s&period;size()`&period;

== Postconditions

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

Strong guarantee&period; Calls to allocate may throw&period; Exceptions thrown on invalid input&period;

== BNF

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

* https://datatracker.ietf.org/doc/html/rfc3986#section-3.2.2[3&period;2&period;2&period; Host (rfc3986)]

== Exceptions

[cols="1,4"]
|===
| Name
| Thrown on
| `system&lowbar;error`
| `s` contains an invalid percent&hyphen;encoding&period;
|===

== Return Value

`&ast;this`

== Parameters

[cols="1,4"]
|===
|Name|Description

| *s*
| The string to set&period;
|===

== See Also

xref:boost/urls/url_base/set_encoded_host.adoc[`set&lowbar;encoded&lowbar;host`], xref:boost/urls/url_base/set_encoded_host_address.adoc[`set&lowbar;encoded&lowbar;host&lowbar;address`], xref:boost/urls/url_base/set_encoded_host_name.adoc[`set&lowbar;encoded&lowbar;host&lowbar;name`], xref:boost/urls/url_base/set_host.adoc[`set&lowbar;host`], xref:boost/urls/url_base/set_host_address.adoc[`set&lowbar;host&lowbar;address`], xref:boost/urls/url_base/set_host_ipv4.adoc[`set&lowbar;host&lowbar;ipv4`], xref:boost/urls/url_base/set_host_ipv6.adoc[`set&lowbar;host&lowbar;ipv6`], xref:boost/urls/url_base/set_host_name.adoc[`set&lowbar;host&lowbar;name`]&period;


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