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Return true if the url is empty.
bool empty() const;
The empty string matches the relative-ref grammar.
assert( [link url.ref.boost__urls__url_view_base.url_view `url_view`]( "" ).[link url.ref.boost__urls__url.empty `empty`]() );
Constant.
Throws nothing.
relative-[link url.ref.boost__urls__grammar__ref `ref`] = relative-part [ "?" [link url.ref.boost__urls__url.query `query`] ] [ "#" [link url.ref.boost__urls__url.fragment `fragment`] ] relative-part = "//" [link url.ref.boost__urls__url.authority `authority`] [link url.ref.boost__urls__url.path `path`]-abempty / [link url.ref.boost__urls__url.path `path`]-absolute / [link url.ref.boost__urls__url.path `path`]-noscheme / [link url.ref.boost__urls__url.path `path`]-[link url.ref.boost__urls__url.empty `empty`]