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##### url_base::has_authority

(Inherited from `url_view_base`)

Return true if an authority is present.

###### Synopsis

    bool
    has_authority() const;

###### Description

This function returns true if the url contains an authority. The presence of an authority is denoted by a double slash ("//") at the beginning or after the scheme.

###### Example

    assert( url_view( "http://www.example.com/index.htm" ).has_authority() );

###### Complexity

Constant.

###### Exception Safety

Throws nothing.

###### BNF

    authority       = [ userinfo "@" ] host [ ":" port ]

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

    absolute-URI    = scheme ":" hier-part [ "?" query ]

    URI-reference   = URI / relative-ref

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

    hier-part       = "//" authority path-abempty
                    ; (more...)

    relative-part   = "//" authority path-abempty
                    ; (more...)

###### Specification

- 3.2. Authority (rfc3986)

###### See Also

`authority`, `encoded_authority`.