Logtalk reference manual
Built-in predicate: current_protocol/1
Contents > Reference Manual > Built-in Predicates > current_protocol/1

## current_protocol/1

#### Description

    current_protocol(Protocol)

Enumerates, by backtracking, all currently defined protocols. All protocols are found, either static, dynamic, or built-in.

#### Template and modes

    current_protocol(?protocol_identifier)

#### Errors

Protocol is neither a variable nor a valid protocol identifier:
  `type_error(protocol_identifier, Protocol)`

#### Examples

    | ?- current_protocol(listp).