/usr/lib/swi-prolog/doc/Manual/apply.html

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<H2><A NAME="sec:A.2"><SPAN class="sec-nr">A.2</SPAN> <SPAN class="sec-title">library(apply): 
Apply predicates on a list</SPAN></A></H2>

<P><A NAME="sec:apply"></A>

<DL>
<DT><B>See also</B><DD>- <CODE>apply_macros.pl</CODE> provides 
compile-time expansion for part of this library. <BR>
- <A class="url" href="http://www.cs.otago.ac.nz/staffpriv/ok/pllib.htm">http://www.cs.otago.ac.nz/staffpriv/ok/pllib.htm</A>
<DT><B>To be done</B><DD> Add <SPAN class="pred-ext">include/4</SPAN>, <SPAN class="pred-ext">include/5</SPAN>, <SPAN class="pred-ext">exclude/4</SPAN>, <SPAN class="pred-ext">exclude/5</SPAN>
</DL>

<P>This module defines meta-predicates that apply a predicate on all 
members of a list.

<DL class="latex">
<DT class="pubdef"><span class="pred-tag">[det]</span><A NAME="include/3"><STRONG>include</STRONG>(<VAR>:Goal, 
+List1, ?List2</VAR>)</A></DT>
<DD class="defbody">
Filter elements for which <VAR>Goal</VAR> succeed. True if <VAR>List2</VAR> 
contains those elements Xi of <VAR>List1</VAR> for which call(<VAR>Goal</VAR>, 
Xi) succeeds.

<DL>
<DT><B>See also</B><DD> Older versions of SWI-Prolog had <SPAN class="pred-ext">sublist/3</SPAN> 
with the same arguments and semantics.
</DL>

</DD>
<DT class="pubdef"><span class="pred-tag">[det]</span><A NAME="exclude/3"><STRONG>exclude</STRONG>(<VAR>:Goal, 
+List1, ?List2</VAR>)</A></DT>
<DD class="defbody">
Filter elements for which <VAR>Goal</VAR> fails. True if <VAR>List2</VAR> 
contains those elements Xi of <VAR>List1</VAR> for which call(<VAR>Goal</VAR>, 
Xi) fails.</DD>
<DT class="pubdef"><span class="pred-tag">[det]</span><A NAME="partition/4"><STRONG>partition</STRONG>(<VAR>:Pred, 
+List, ?Included, ?Excluded</VAR>)</A></DT>
<DD class="defbody">
Filter elements of <VAR>List</VAR> according to <VAR>Pred</VAR>. True if <VAR>Included</VAR> 
contains all elements for which call(<VAR>Pred</VAR>, X) succeeds and
<VAR>Excluded</VAR> contains the remaining elements.</DD>
<DT class="pubdef"><span class="pred-tag">[semidet]</span><A NAME="partition/5"><STRONG>partition</STRONG>(<VAR>:Pred, 
+List, ?Less, ?Equal, ?Greater</VAR>)</A></DT>
<DD class="defbody">
Filter list according to <VAR>Pred</VAR> in three sets. For each element 
Xi of <VAR>List</VAR>, its destination is determined by call(<VAR>Pred</VAR>, 
Xi, Place), where Place must be unified to one of <CODE>&lt;</CODE>, <CODE>=</CODE> 
or <CODE>&gt;</CODE>.
<VAR>Pred</VAR> must be deterministic.</DD>
<DT class="pubdef"><A NAME="maplist/2"><STRONG>maplist</STRONG>(<VAR>:Goal, 
?List</VAR>)</A></DT>
<DD class="defbody">
True if <VAR>Goal</VAR> can succesfully be applied on all elements of <VAR>List</VAR>. 
Arguments are reordered to gain performance as well as to make the 
predicate deterministic under normal circumstances.</DD>
<DT class="pubdef"><A NAME="maplist/3"><STRONG>maplist</STRONG>(<VAR>:Goal, 
?List1, ?List2</VAR>)</A></DT>
<DD class="defbody">
True if <VAR>Goal</VAR> can succesfully be applied to all succesive 
pairs of elements of <VAR>List1</VAR> and <VAR>List2</VAR>.</DD>
<DT class="pubdef"><A NAME="maplist/4"><STRONG>maplist</STRONG>(<VAR>:Goal, 
?List1, ?List2, ?List3</VAR>)</A></DT>
<DD class="defbody">
True if <VAR>Goal</VAR> can succesfully be applied to all succesive 
triples of elements of <VAR>List1</VAR>..<VAR>List3</VAR>.</DD>
<DT class="pubdef"><A NAME="maplist/5"><STRONG>maplist</STRONG>(<VAR>:Goal, 
?List1, ?List2, ?List3, List4</VAR>)</A></DT>
<DD class="defbody">
True if <VAR>Goal</VAR> can succesfully be applied to all succesive 
quadruples of elements of <VAR>List1</VAR>..<VAR>List4</VAR>
</DD>
</DL>

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