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

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<h2 id="sec:check"><a id="sec:A.6"><span class="sec-nr">A.6</span> <span class="sec-title">library(check): 
Elementary completeness checks</span></a></h2>

<a id="sec:check"></a>

<p>This library defines the predicate <a id="idx:check0:1798"></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 id="check/0"><strong>check</strong></a></dt>
<dd class="defbody">
Performs the three checking passes implemented by <a id="idx:listundefined0:1799"></a><a class="pred" href="check.html#list_undefined/0">list_undefined/0</a>,
<a id="idx:listautoload0:1800"></a><a class="pred" href="check.html#list_autoload/0">list_autoload/0</a> 
and <a id="idx:listredefined0:1801"></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 id="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 or is declared using <a id="idx:dynamic1:1802"></a><a class="pred" href="dynamic.html#dynamic/1">dynamic/1</a> 
or
<a id="idx:multifile1:1803"></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 id="idx:listautoload0:1804"></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 of how to 
edit the referencing predicate using <a id="idx:edit1:1805"></a><a class="pred" href="edit.html#edit/1">edit/1</a>.

<pre class="code">
?- list_undefined.
Warning: The predicates below are not defined. If these are
Warning: defined at runtime using assert/1, use
Warning: :- 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 id="list_autoload/0"><strong>list_autoload</strong></a></dt>
<dd class="defbody">
Lists all undefined (see <a id="idx:listundefined0:1806"></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 id="idx:autoload0:1807"></a><a class="pred" href="runtime.html#autoload/0">autoload/0</a>.</dd>
<dt class="pubdef"><a id="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; that is, predicates for which the local 
definition overrules the global default definition.
</dd>
</dl>

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swi-prolog-nox 6.6.4-2ubuntu1 / usr / lib / swi-prolog / doc / Manual / check.html
