[#boost-urls-url-2constructor-002]
= xref:boost/urls/url/2constructor-002.adoc[boost::urls::url::url]
:relfileprefix: ../../../
:mrdocs:

Constructor

== Synopsis

Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/url.hpp#L169[boost/url/url.hpp]>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
explicit
url(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. The new url retains ownership by allocating a copy of the passed string.

== Example
[,cpp]
----
url u( "https://www.example.com" );
----
== Effects
[,cpp]
----
return url( parse_uri_reference( s ).value() );
----
== Postconditions
[,cpp]
----
this->buffer().data() != s.data()
----
== Complexity
Linear in `s.size()`.

== Exception Safety
Calls to allocate may throw. 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 does not contain a valid url.
|===

== Parameters

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


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