:relfileprefix: ../../../
[#974C15A34E00EB5C641D90AB694F0145DA7C153D]

= Function url::set_fragment

pass:v,q[Set the fragment.]


== Synopsis

Declared in header `</boost/url/url.hpp#L483[boost/url/url.hpp,window=blank_]>`

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

== Description

pass:v,q[This function sets the fragment to the] pass:v,q[specified string, which may be empty.]
pass:v,q[An empty fragment is distinct from]
pass:v,q[having no fragment.]
pass:v,q[Reserved characters in the string are]
pass:v,q[percent-escaped in the result.]

=== Example
[,cpp]
----
assert( url("?first=john&last=doe" ).set_encoded_fragment( "john doe" ).encoded_fragment() == "john%20doe" );
----

=== Postconditions
[,cpp]
----
this->has_fragment() == true && this->fragment() == s
----

=== Complexity
pass:v,q[Linear in `this->size() + s.size()`.]

=== Exception Safety
pass:v,q[Strong guarantee.]
pass:v,q[Calls to allocate may throw.]

=== BNF
[,cpp]
----
fragment    = *( pchar / "/" / "?" )
----

=== Specification

* link:https://datatracker.ietf.org/doc/html/rfc3986#section-3.5[3.5.  Fragment]



== Return Value

* `` 


== Parameters

|===
| Name | Type 

| *s*
| `string_view`

|===