...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
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 / "+" / "-" / "." )