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

Set the scheme

== Synopsis

Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/static_url.hpp#L349[boost/url/static_url.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:boost/urls/static_url.adoc[static_url]&
set_scheme_id(xref:boost/urls/scheme.adoc[urls::scheme] id);
----

== Description

This function sets the scheme to the specified known xref:boost/urls/scheme.adoc[`urls::scheme`] id, which may not be xref:boost/urls/scheme.adoc[`scheme::unknown`] or else an exception is thrown. If the id is xref:boost/urls/scheme.adoc[`scheme::none`], this function behaves as if xref:boost/urls/url_base/remove_scheme.adoc[`remove_scheme`] were called.

== Example
[,cpp]
----
assert( url( "http://example.com/echo.cgi" ).set_scheme_id( scheme::wss ).buffer() == "wss://example.com/echo.cgi" );
----
== Complexity
Linear in `this‐>size()`.

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

== Specification
* https://datatracker.ietf.org/doc/html/rfc3986#section-3.1[]

== Return Value

`*this`

== Parameters

[cols=2]
|===
| Name
| Description
| *id*
| The scheme to set.
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#