[#boost-urls-url_view-2constructor-025]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/url_view.adoc[url&lowbar;view]::url&lowbar;view
:relfileprefix: ../../../
:mrdocs:

Constructor

== Synopsis

Declared in `&lt;https://www.github.com/boostorg/url/blob/develop/include/boost/url/url_view.hpp#L205[boost&sol;url&sol;url&lowbar;view&period;hpp]&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
url&lowbar;view(core::string&lowbar;view s);
----

== Description

This function constructs a URL from the string `s`, which must contain a valid _URI_ or _relative&hyphen;ref_ or else an exception is thrown&period; Upon successful construction, the view refers to the characters in the buffer pointed to by `s`&period; Ownership is not transferred&semi; The caller is responsible for ensuring that the lifetime of the buffer extends until it is no longer referenced&period;

== Example

[,cpp]
----
url_view u( "http://www.example.com/index.htm" );
----
== Effects

[,cpp]
----
return parse_uri_reference( s ).value();
----
== Complexity

Linear in `s&period;size()`&period;

== Exception Safety

Exceptions thrown on invalid input&period;

== BNF

[,cpp]
----
URI           = scheme ":" hier-part [ "?" query ] [ "#" fragment ]

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

* https://datatracker.ietf.org/doc/html/rfc3986#section-4.1[4&period;1&period; URI Reference]

== Exceptions

[cols="1,4"]
|===
| Name| Thrown on
| `system&lowbar;error`
| The input failed to parse correctly&period;
|===

== Parameters

[cols="1,4"]
|===
| Name| Description
| *s*
| The string to parse&period;
|===

== See Also

xref:boost/urls/parse_uri_reference.adoc[`parse&lowbar;uri&lowbar;reference`]&period;


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