[#boost-urls-url_view_base-empty]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/url_view_base.adoc[url&lowbar;view&lowbar;base]::empty
:relfileprefix: ../../../
:mrdocs:

Return true if the url is empty

== Synopsis

Declared in `&lt;https://www.github.com/boostorg/url/blob/develop/include/boost/url/url_view_base.hpp#Lundefined[boost&sol;url&sol;url&lowbar;view&lowbar;base&period;hpp]&gt;`

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

== Description

The empty string matches the _relative&hyphen;ref_ grammar&period;

== Example

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

Constant&period;

== Exception Safety

Throws nothing&period;

== BNF

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

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

* https://datatracker.ietf.org/doc/html/rfc3986#section-4.2[4&period;2&period; Relative Reference (rfc3986)]

== Return Value

`true` if the url is empty&period;


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