.. index:: difflist
.. _difflist/0:

.. rst-class:: right

**object**

``difflist``
============

Difference list predicates.

| **Availability:** 
|    ``logtalk_load(types(loader))``

| **Author:** Paulo Moura
| **Version:** 2:0:0
| **Date:** 2020-05-11

| **Compilation flags:**
|    ``static, context_switching_calls``


| **Implements:**
|    ``public`` :ref:`listp <listp/0>`
| **Extends:**
|    ``public`` :ref:`compound <compound/0>`
| **Uses:**
|    :ref:`list <list/0>`

| **Remarks:**
|    (none)

| **Inherited public predicates:**
|     :ref:`comparingp/0::(<)/2`  :ref:`comparingp/0::(=:=)/2`  :ref:`comparingp/0::(=<)/2`  :ref:`comparingp/0::(=\=)/2`  :ref:`comparingp/0::(>)/2`  :ref:`comparingp/0::(>=)/2`  :ref:`listp/0::append/2`  :ref:`listp/0::append/3`  :ref:`termp/0::check/1`  :ref:`listp/0::delete/3`  :ref:`listp/0::delete_matches/3`  :ref:`termp/0::depth/2`  :ref:`listp/0::drop/3`  :ref:`listp/0::empty/1`  :ref:`listp/0::flatten/2`  :ref:`termp/0::ground/1`  :ref:`listp/0::hamming_distance/3`  :ref:`listp/0::keysort/2`  :ref:`listp/0::last/2`  :ref:`listp/0::length/2`  :ref:`listp/0::max/2`  :ref:`listp/0::member/2`  :ref:`listp/0::memberchk/2`  :ref:`listp/0::min/2`  :ref:`listp/0::msort/2`  :ref:`listp/0::msort/3`  :ref:`termp/0::new/1`  :ref:`listp/0::nextto/3`  :ref:`listp/0::nth0/3`  :ref:`listp/0::nth0/4`  :ref:`listp/0::nth1/3`  :ref:`listp/0::nth1/4`  :ref:`termp/0::numbervars/1`  :ref:`termp/0::numbervars/3`  :ref:`listp/0::occurrences/2`  :ref:`listp/0::occurrences/3`  :ref:`termp/0::occurs/2`  :ref:`listp/0::partition/5`  :ref:`listp/0::permutation/2`  :ref:`listp/0::prefix/2`  :ref:`listp/0::prefix/3`  :ref:`listp/0::proper_prefix/2`  :ref:`listp/0::proper_prefix/3`  :ref:`listp/0::proper_suffix/2`  :ref:`listp/0::proper_suffix/3`  :ref:`listp/0::remove_duplicates/2`  :ref:`listp/0::reverse/2`  :ref:`listp/0::same_length/2`  :ref:`listp/0::same_length/3`  :ref:`listp/0::select/3`  :ref:`listp/0::select/4`  :ref:`listp/0::selectchk/3`  :ref:`listp/0::selectchk/4`  :ref:`listp/0::sequential_occurrences/2`  :ref:`listp/0::sequential_occurrences/3`  :ref:`termp/0::singletons/2`  :ref:`listp/0::sort/2`  :ref:`listp/0::sort/3`  :ref:`listp/0::sort/4`  :ref:`listp/0::split/4`  :ref:`listp/0::sublist/2`  :ref:`listp/0::subsequence/3`  :ref:`listp/0::subsequence/4`  :ref:`listp/0::substitute/4`  :ref:`termp/0::subsumes/2`  :ref:`termp/0::subterm/2`  :ref:`listp/0::subtract/3`  :ref:`listp/0::suffix/2`  :ref:`listp/0::suffix/3`  :ref:`listp/0::take/3`  :ref:`termp/0::valid/1`  :ref:`termp/0::variables/2`  :ref:`termp/0::variant/2`  :ref:`termp/0::varnumbers/2`  :ref:`termp/0::varnumbers/3`  

.. contents::
   :local:
   :backlinks: top

Public predicates
-----------------

.. index:: add/3
.. _difflist/0::add/3:

``add/3``
^^^^^^^^^

Adds a term to the end of a difference list.

| **Compilation flags:**
|    ``static``

| **Template:**
|    ``add(Term,DiffList,NewDiffList)``
| **Mode and number of proofs:**
|    ``add(@term,+difference_list,-difference_list)`` - ``one``


------------

.. index:: as_list/2
.. _difflist/0::as_list/2:

``as_list/2``
^^^^^^^^^^^^^

Returns a list with the elements of the difference list.

| **Compilation flags:**
|    ``static``

| **Template:**
|    ``as_list(DiffList,List)``
| **Mode and number of proofs:**
|    ``as_list(@difference_list,-list)`` - ``one``


------------

Protected predicates
--------------------

(no local declarations; see entity ancestors if any)

Private predicates
------------------

(no local declarations; see entity ancestors if any)

Operators
---------

(none)

.. seealso::

   :ref:`list <list/0>`, :ref:`list(Type) <list/1>`, :ref:`numberlist <numberlist/0>`, :ref:`varlist <varlist/0>`