:relfileprefix: ../../../
[#boost-urls-authority_view-port_number]

= xref:boost.adoc[pass:[boost]]::xref:boost/urls.adoc[pass:[urls]]::xref:boost/urls/authority_view.adoc[pass:[authority_view]]::port_number


Return the port


== Synopsis

Declared in header `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/authority_view.hpp#L1168[boost/url/authority_view.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
xref:std.adoc[std]::uint16_t
port_number() const noexcept;
----

== Description


If a port is present and the numerical
value is representable, it is returned
as an unsigned integer. Otherwise, the
number zero is returned.

=== Example
[,cpp]
----
assert( url_view( "http://localhost.com:8080" ).port_number() == 8080 );
----

=== Complexity

Constant.

=== Exception Safety

Throws nothing.

=== BNF
[,cpp]
----
port        = *DIGIT
----

=== Specification

* link:https://datatracker.ietf.org/doc/html/rfc3986#section-3.2.3[3.2.3. Port (rfc3986)]








== See Also


xref:boost/urls/authority_view/encoded_host_and_port.adoc[encoded_host_and_port]
,
xref:boost/urls/authority_view/has_port.adoc[has_port]
,
xref:boost/urls/authority_view/port.adoc[port]
.



