[#boost-urls-ipv4_address-08friend-07]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::operator<<
:relfileprefix: ../../../
:mrdocs:


Format the address to an output stream.

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/ipv4_address.hpp#L297[boost/url/ipv4_address.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
friend
std::ostream&
operator<<(
    std::ostream& os,
    xref:boost/urls/ipv4_address.adoc[ipv4_address] const& addr);
----

== Description


IPv4 addresses written to output streams        are written in their dotted decimal format.



== Parameters


|===
| Name | Description

| *os*
| The output stream.


| *addr*
| The address to format.


|===



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