[#boost-urls-authority_view-port_number]
= xref:boost/urls/authority_view/port_number.adoc[boost::urls::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#L1232[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
* https://datatracker.ietf.org/doc/html/rfc3986#section-3.2.3[]

== Return Value

The port number

== 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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