:relfileprefix: ../../../
[#79B53D34FC61E5CE15C0301A400D425D159B48A9]

= Function url_base::set_encoded_fragment

pass:v,q[Set the fragment.]


== Synopsis

Declared in header `</boost/url/url_base.hpp#L2485[boost/url/url_base.hpp,window=blank_]>`

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

== Description

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

=== Example
[,cpp]
----
assert( url("?first=john&last=doe" ).set_encoded_fragment( "john%2Ddoe" ).fragment() == "john-doe" );
----

=== Postconditions
[,cpp]
----
this->has_fragment() == true && this->fragment() == decode_view( 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.]
pass:v,q[Exceptions thrown on invalid input.]

=== 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*
| `pct_string_view`

|===