[#boost-urls-static_url-set_host_ipv6]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/static_url.adoc[static&lowbar;url]::set&lowbar;host&lowbar;ipv6
:relfileprefix: ../../../
:mrdocs:

Set the host to an address

== Synopsis

Declared in `&lt;https://www.github.com/boostorg/url/blob/develop/include/boost/url/static_url.hpp#L386[boost&sol;url&sol;static&lowbar;url&period;hpp]&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/static_url.adoc[static&lowbar;url]&
set&lowbar;host&lowbar;ipv6(xref:boost/urls/ipv6_address.adoc[ipv6&lowbar;address] const& addr);
----

== Description

The host is set to the specified IPv6 address&period; The host type is xref:boost/urls/host_type.adoc[`host&lowbar;type&colon;&colon;ipv6`]&period;

== Example
[,cpp]
----
assert( url().set_host_ipv6( ipv6_address( "1::6:c0a8:1" ) ).authority().buffer() == "[1::6:c0a8:1]" );
----
== Postconditions
[,cpp]
----
this->has_authority() == true && this->host_ipv6_address() == addr && this->host_type() == host_type::ipv6
----
== Complexity
Linear in `this&hyphen;&gt;size()`&period;

== Exception Safety
Strong guarantee&period; Calls to allocate may throw&period;

== BNF
[,cpp]
----
IPv6address =                            6( h16 ":" ) ls32
            /                       "::" 5( h16 ":" ) ls32
            / [               h16 ] "::" 4( h16 ":" ) ls32
            / [ *1( h16 ":" ) h16 ] "::" 3( h16 ":" ) ls32
            / [ *2( h16 ":" ) h16 ] "::" 2( h16 ":" ) ls32
            / [ *3( h16 ":" ) h16 ] "::"    h16 ":"   ls32
            / [ *4( h16 ":" ) h16 ] "::"              ls32
            / [ *5( h16 ":" ) h16 ] "::"              h16
            / [ *6( h16 ":" ) h16 ] "::"

ls32        = ( h16 ":" h16 ) / IPv4address
            ; least-significant 32 bits of address

h16         = 1*4HEXDIG
            ; 16 bits of address represented in hexadecimal
----
== Specification
* https://datatracker.ietf.org/doc/html/rfc4291[]
* https://datatracker.ietf.org/doc/html/rfc3986#section-3.2.2[]

== Return Value

`&ast;this`

== Parameters

[cols=2]
|===
| Name
| Description
| *addr*
| The address to set&period;
|===

== See Also

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


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