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

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<H2><A NAME="sec:A.6"><SPAN class="sec-nr">A.6</SPAN> <SPAN class="sec-title">library(check): 
Elementary completeness checks</SPAN></A></H2>

<A NAME="check"></A>

<P>This library defines the predicate <A NAME="idx:check0:1572"></A><A class="pred" href="check.html#check/0">check/0</A> 
and a few friends that allow for a quick-and-dirty cross-referencing.

<DL class="latex">
<DT class="pubdef"><A NAME="check/0"><STRONG>check</STRONG></A></DT>
<DD class="defbody">
Performs the three checking passes implemented by <A NAME="idx:listundefined0:1573"></A><A class="pred" href="check.html#list_undefined/0">list_undefined/0</A>,
<A NAME="idx:listautoload0:1574"></A><A class="pred" href="check.html#list_autoload/0">list_autoload/0</A> 
and <A NAME="idx:listredefined0:1575"></A><A class="pred" href="check.html#list_redefined/0">list_redefined/0</A>. 
Please check the definition of these predicates for details.

<P>The typical usage of this predicate is right after loading your 
program to get a quick overview on the completeness and possible 
conflicts in your program.</DD>
<DT class="pubdef"><A NAME="list_undefined/0"><STRONG>list_undefined</STRONG></A></DT>
<DD class="defbody">
Scans the database for predicates that have no definition. A predicate 
is considered defined if it has clauses, is declared using <A NAME="idx:dynamic1:1576"></A><A class="pred" href="dynamic.html#dynamic/1">dynamic/1</A> 
or
<A NAME="idx:multifile1:1577"></A><A class="pred" href="dynamic.html#multifile/1">multifile/1</A>. 
As a program is compiled calls are translated to predicates. If the 
called predicate is not yet defined it is created as a predicate without 
definition. The same happens with runtime generated calls. This 
predicate lists all such undefined predicates that are referenced and 
not defined in the library. See also
<A NAME="idx:listautoload0:1578"></A><A class="pred" href="check.html#list_autoload/0">list_autoload/0</A>. 
Below is an example from a real program and an illustration how to edit 
the referencing predicate using <A NAME="idx:edit1:1579"></A><A class="pred" href="listing.html#edit/1">edit/1</A>.

<PRE class="code">
?- list_undefined.
Warning: The predicates below are not defined. If these are defined
Warning: at runtime using assert/1, use :- dynamic Name/Arity.
Warning: 
Warning: rdf_edit:rdfe_retract/4, which is referenced by
Warning:         1-st clause of rdf_edit:undo/4
Warning: rdf_edit:rdfe_retract/3, which is referenced by
Warning:         1-st clause of rdf_edit:delete_object/1
Warning:         1-st clause of rdf_edit:delete_subject/1
Warning:         1-st clause of rdf_edit:delete_predicate/1

?- edit(rdf_edit:undo/4).
</PRE>

</DD>
<DT class="pubdef"><A NAME="list_autoload/0"><STRONG>list_autoload</STRONG></A></DT>
<DD class="defbody">
Lists all undefined (see <A NAME="idx:listundefined0:1580"></A><A class="pred" href="check.html#list_undefined/0">list_undefined/0</A>) 
predicates that have a definition in the library along with the file 
from which they will be autoloaded when accessed. See also <A NAME="idx:autoload0:1581"></A><A class="pred" href="runtime.html#autoload/0">autoload/0</A>.</DD>
<DT class="pubdef"><A NAME="list_redefined/0"><STRONG>list_redefined</STRONG></A></DT>
<DD class="defbody">
Lists predicates that are defined in the global module <CODE>user</CODE> 
as well as in a normal module. I.e. predicates for which the local 
definition overrules the global default definition.
</DD>
</DL>

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swi-prolog-nox 5.10.4-3ubuntu1 / usr / lib / swi-prolog / doc / Manual / check.html
