[#boost-urls-authority_view-2constructor-03]
= xref:boost.adoc[boost]::xref:boost/urls.adoc[urls]::xref:boost/urls/authority_view.adoc[authority_view]::authority_view
:relfileprefix: ../../../
:mrdocs:


Construct from a string.

== Synopsis


Declared in `<https://www.github.com/boostorg/url/blob/develop/include/boost/url/authority_view.hpp#L158[boost/url/authority_view.hpp]>`

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

== Description


This function attempts to construct        an authority from the string `s`,        which must be a valid ['authority] 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 the view is destroyed.


=== BNF

[,cpp]
----
authority     = [ userinfo "@" ] host [ ":" port ]

userinfo      = user [ ":" [ password ] ]

user          = *( unreserved / pct-encoded / sub-delims )
password      = *( unreserved / pct-encoded / sub-delims / ":" )

host          = IP-literal / IPv4address / reg-name

port          = *DIGIT
----

=== Specification

* link:https://datatracker.ietf.org/doc/html/rfc3986#section-3.2[3.2. Authority (rfc3986)]



== See Also


xref:boost/urls/parse_authority.adoc[parse_authority].






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