:relfileprefix: ../../../
[#E7247B6ED2F3D8AF8D2C7167CDF5CCC86B2AD9FA]

= Function url_view_base::empty

pass:v,q[Return true if the url is empty]


== Synopsis

Declared in header `</boost/url/url_view_base.hpp#L201[boost/url/url_view_base.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
bool
empty() const noexcept;
----

== Description

pass:v,q[The empty string matches the] pass:v,q[relative-ref] pass:v,q[grammar.]

=== Example
[,cpp]
----
assert( url_view( "" ).empty() );
----

=== Complexity
pass:v,q[Constant.]

=== Exception Safety
pass:v,q[Throws nothing.]

=== BNF
[,cpp]
----
relative-ref  = relative-part [ "?" query ] [ "#" fragment ]

relative-part = "//" authority path-abempty
              / path-absolute
              / path-noscheme
              / path-empty
----

=== Specification

* link:https://datatracker.ietf.org/doc/html/rfc3986#section-4.2[4.2.  Relative Reference (rfc3986)]



== Return Value

* `bool`