abolish/1 — The Logtalk Handbook v3.47.0 documentation

# `abolish/1`

## Description

    abolish(Predicate)

Abolishes a runtime declared object dynamic predicate or an object local dynamic predicate. Only predicates that are dynamically declared at runtime (using a call to the asserta/1 or assertz/1 built-in methods) can be abolished.

When the predicate indicator is declared in a uses/2 or use_module/2 directive, the predicate is abolished in the referenced object or module. When the backend Prolog compiler supports a module system, the predicate argument can also be module qualified.

## Modes and number of proofs

    abolish(@predicate_indicator) - one

## Errors

`Predicate` is a variable:
`instantiation_error`
`Functor` is a variable:
`instantiation_error`
`Arity` is a variable:
`instantiation_error`
`Predicate` is neither a variable nor a valid predicate indicator:
`type_error(predicate_indicator, Predicate)`
`Functor` is neither a variable nor an atom:
`type_error(atom, Functor)`
`Arity` is neither a variable nor an integer:
`type_error(integer, Arity)`
`Predicate` is statically declared:
`permission_error(modify, predicate_declaration, Name/Arity)`
`Predicate` is a private predicate:
`permission_error(modify, private_predicate, Name/Arity)`
`Predicate` is a protected predicate:
`permission_error(modify, protected_predicate, Name/Arity)`
`Predicate` is a static predicate:
`permission_error(modify, static_predicate, Name/Arity)`
`Predicate` is not declared for the object receiving the message:
`existence_error(predicate_declaration, Name/Arity)`

## Examples

To abolish a local dynamic predicate or a dynamic predicate in this:
`abolish(Predicate)`
To abolish a public or protected dynamic predicate in self:
`::abolish(Predicate)`
To abolish a public dynamic predicate in an explicit object:
`Object::abolish(Predicate)`

See also

asserta/1, assertz/1, clause/2, retract/1, retractall/1 dynamic/0, dynamic/1, uses/2, use_module/2