[#boost-urls-static_url-set_port]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/static_url.adoc[static_url]::set_port
:relfileprefix: ../../../
:mrdocs:


Set the port

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/static_url.hpp#L394[boost/url/static_url.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/static_url.adoc[static_url]&
set_port(core::string_view s);
----

== Description


This port is set to the string, which        must contain only digits or be empty.        An empty port string is distinct from        having no port.


=== Example

[,cpp]
----
assert( url( "http://www.example.com" ).set_port( "8080" ).authority().buffer() == "www.example.com:8080" );
----

=== Postconditions

[,cpp]
----
this->has_port() == true && this->port_number() == n && this->port() == std::to_string(n)
----

=== Exception Safety

Strong guarantee.        Calls to allocate may throw.        Exceptions thrown on invalid input.


=== BNF

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

=== Specification

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



== Exceptions


|===
| Name | Thrown on

| `system_error`
| `s` does not contain a valid port.


|===

== Parameters


|===
| Name | Description

| *s*
| The port string to set.


|===

== See Also


xref:boost/urls/url_base/remove_port.adoc[remove_port],            xref:boost/urls/url_base/set_port.adoc[set_port].






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