Return the scheme

Synopsis

Declared in header </boost/url/url_view_base.hpp#L424[boost/url/url_view_base.hpp,window=blank_]>

scheme
scheme_id() const noexcept;

Description

This function returns a value which depends on the scheme in the url:

  • If the scheme is a well-known scheme, corresponding value from the enumeration urls::scheme is returned.

  • If a scheme is present but is not a well-known scheme, the value returned is urls::scheme::unknown.

  • Otherwise, if the scheme is absent the value returned is urls::scheme::none.

Example

assert( url_view( "wss://www.example.com/crypto.cgi" ).scheme_id() == scheme::wss );

Complexity

Constant.

Exception Safety

Throws nothing.

BNF

URI             = scheme ":" hier-part [ "?" query ] [ "#" fragment ]

absolute-URI    = scheme ":" hier-part [ "?" query ]

scheme          = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )

Specification

Return Value

  • scheme