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.. rst-class:: align-right

directive

.. index:: pair: discontiguous/1; Directive .. _directives_discontiguous_1:

discontiguous/1

Description

::

discontiguous(Name/Arity) discontiguous((Name/Arity, ...)) discontiguous([Name/Arity, ...])

discontiguous(Name//Arity) discontiguous((Name//Arity, ...)) discontiguous([Name//Arity, ...])

Declares :term:`discontiguous <discontiguous predicate>` predicates and discontiguous grammar rule non-terminals. The use of this directive should be avoided as not all :term:`backend Prolog compilers <backend Prolog compiler>` support discontiguous predicates.

.. warning::

Some backend Prolog compilers declare the atom discontiguous as an operator for a lighter syntax. But this makes the code non-portable and is therefore a practice best avoided.

Template and modes

::

discontiguous(+predicate_indicator_term) discontiguous(+non_terminal_indicator_term)

Examples

::

:- discontiguous(counter/1).

:- discontiguous((lives/2, works/2)).

:- discontiguous([db/4, key/2, file/3]).