[#boost-urls-url_view-2constructor-025]
= 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#L197[boost/url/url_view.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
url_view(core::string_view s);
----

== Description

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

== Example
[,cpp]
----
url_view u( "http://www.example.com/index.htm" );
----
== Effects
[,cpp]
----
return parse_uri_reference( s ).value();
----
== Complexity
Linear in `s.size()`.

== Exception Safety
Exceptions thrown on invalid input.

== 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[]

== Exceptions

[cols=2]
|===
| Name
| Thrown on
| `system_error`
| The input failed to parse correctly.
|===

== Parameters

[cols=2]
|===
| Name
| Description
| *s*
| The string to parse.
|===

== See Also

xref:boost/urls/parse_uri_reference.adoc[`parse_uri_reference`].


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