[#6625AC41A4020227FDE0A74FE865C7F7E1791A63]
Return true if a fragment is present
bool has_fragment() const noexcept;
This function returns true if the url contains a fragment. An empty fragment is distinct from no fragment.
assert( url_view( "http://www.example.com/index.htm#anchor" ).has_fragment() );
Constant.
Throws nothing.
URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ]
relative-ref = relative-part [ "?" query ] [ "#" fragment ]