[#boost-urls-ipv6_address-2constructor-08]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/ipv6_address.adoc[ipv6_address]::ipv6_address
:relfileprefix: ../../../
:mrdocs:


Construct from an IPv4 address.

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/ipv6_address.hpp#L141[boost/url/ipv6_address.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
ipv6_address(xref:boost/urls/ipv4_address.adoc[ipv4_address] const& addr) noexcept;
----

== Description


This function constructs an IPv6 address        from the IPv4 address `addr`. The resulting        address is an IPv4‐Mapped IPv6 Address.


=== Specification

* link:https://datatracker.ietf.org/doc/html/rfc4291#section-2.5.5.2[2.5.5.2. IPv4‐Mapped IPv6 Address (rfc4291)]



== Parameters


|===
| Name | Description

| *addr*
| The address to construct from.


|===



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