{}/1

Description

{Goal}

Calls external Prolog code. Can be used to bypass the Logtalk compiler. The argument is called within the context of the pseudo-object user.

Template and modes

{+callable}

Errors

Goal is a variable:

instantiation_error

Goal is neither a variable nor a callable term:

type_error(callable, Goal)

Examples

N1/D1 < N2/D2 :-
    {N1*D2 < N2*D1}.