[#boost-urls-url_view-2constructor-0c]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/url_view.adoc[url_view]::url_view
:relfileprefix: ../../../
:mrdocs:


Constructor

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/url_view.hpp#L146[boost/url/url_view.hpp]>`

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

== Description


Default constructed views refer to        a string with zero length, which        always remains valid. This matches        the grammar for a relative‐ref with        an empty path and no query or        fragment.


=== Example

[,cpp]
----
url_view u;
----

=== Postconditions

[,cpp]
----
this->empty() == true
----

=== Complexity

Constant.


=== Exception Safety

Throws nothing.


=== BNF

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

=== Specification

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





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