Return true a scheme is present
Synopsis
Declared in header <boost/url/url_view_base.hpp>
bool
has_scheme() const noexcept;Description
This function returns true if this contains a scheme.
Example
assert( url_view( "http://www.example.com" ).has_scheme() );Complexity
Constant.
Exception Safety
Throws nothing.
BNF
URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ]
absolute-URI = scheme ":" hier-part [ "?" query ]
scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )