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Return true a scheme is present.
bool has_scheme() const;
This function returns true if this contains a scheme.
assert( url_view( "http://www.example.com" ).has_scheme() );
Constant.
Throws nothing.
URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ] absolute-URI = scheme ":" hier-part [ "?" query ] scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )