[#boost-urls-authority_view-port_number]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/authority_view.adoc[authority_view]::port_number
:relfileprefix: ../../../
:mrdocs:


Return the port

== Synopsis


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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
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].






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