existence_error/2¶
Description¶
existence_error(Thing, Culprit)
Throws an existence error. This built-in predicate is declared as
a private method and thus cannot be used as a message to an object.
Calling this predicate is equivalent to the following sequence of calls
where Head
is the head of the predicate clause making the call:
...,
context(Context),
throw(error(existence_error(Thing,Culprit), logtalk(Head,Context))).
This allows the user to generate errors in the same format used by the runtime.
Modes and number of proofs¶
existence_error(+nonvar) - error
Errors¶
When called:
existence_error(Thing,Culprit)
Examples¶
...,
\+ current_object(payroll),
existence_error(object, payroll).