[#boost-urls-url_base-set_host_ipvfuture]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/url_base.adoc[url_base]::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_base.hpp#L1412[boost/url/url_base.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/url_base.adoc[url_base]&
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

* 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].






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