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<h2 id="sec:manipmodule"><a id="sec:5.14"><span class="sec-nr">5.14</span> <span class="sec-title">Module
properties</span></a></h2>
<a id="sec:manipmodule"></a>
<p>The following predicates can be used to query the module system for
reflexive programming:
<dl class="latex">
<dt class="pubdef"><span class="pred-tag">[nondet]</span><a id="current_module/1"><strong>current_module</strong>(<var>?Module</var>)</a></dt>
<dd class="defbody">
True if <var>Module</var> is a currently defined module. This predicate
enumerates all modules, whether loaded from a file or created
dynamically. Note that modules cannot be destroyed in the current
version of SWI-Prolog.</dd>
<dt class="pubdef"><a id="module_property/2"><strong>module_property</strong>(<var>?Module,
?Property</var>)</a></dt>
<dd class="defbody">
True if <var>Property</var> is a property of <var>Module</var>. Defined
properties are:
<dl class="latex">
<dt><strong>class</strong>(<var>-Class</var>)</dt>
<dd class="defbody">
True when <var>Class</var> is the class of the module. Defined classes
are
<dl class="latex">
<dt><strong>user</strong></dt>
<dd class="defbody">
Default for user-defined modules.
</dd>
<dt><strong>system</strong></dt>
<dd class="defbody">
Module <code>system</code> and modules from <code><<var>home</var>>/boot</code>.
</dd>
<dt><strong>library</strong></dt>
<dd class="defbody">
Other modules from the system directories.
</dd>
<dt><strong>test</strong></dt>
<dd class="defbody">
Modules that create tests.
</dd>
<dt><strong>development</strong></dt>
<dd class="defbody">
Modules that only support the development environment.
</dd>
</dl>
</dd>
<dt><strong>file</strong>(<var>?File</var>)</dt>
<dd class="defbody">
True if <var>Module</var> was loaded from <var>File</var>.
</dd>
<dt><strong>line_count</strong>(<var>-Line</var>)</dt>
<dd class="defbody">
True if <var>Module</var> was loaded from the N-th line of file.
</dd>
<dt><strong>exports</strong>(<var>-ListOfPredicateIndicators</var>)</dt>
<dd class="defbody">
True if <var>Module</var> exports the given predicates. Predicate
indicators are in canonical form (i.e., always using name/arity and
never the DCG form name//arity). Future versions may also use the DCG
form and include public operators. See also
<a id="idx:predicateproperty2:1480"></a><a class="pred" href="examineprog.html#predicate_property/2">predicate_property/2</a>.
</dd>
<dt><strong>exported_operators</strong>(<var>-ListOfOperators</var>)</dt>
<dd class="defbody">
True if <var>Module</var> exports the given operators. Each exported
operator is represented as a term <code>op(Pri,Assoc,Name)</code>.
</dd>
</dl>
</dd>
<dt class="pubdef"><a id="set_module/1"><strong>set_module</strong>(<var>:Property</var>)</a></dt>
<dd class="defbody">
Modify properties of the module. Currently, the following properties may
be modified:
<dl class="latex">
<dt><strong>base</strong>(<var>+Base</var>)</dt>
<dd class="defbody">
Set the default import module of the current module to <var>Module</var>.
Typically, <var>Module</var> is one of <code>user</code> or <code>system</code>.
See
<a class="sec" href="importmodule.html">section 5.9</a>.
</dd>
<dt><strong>class</strong>(<var>+Class</var>)</dt>
<dd class="defbody">
Set the class of the module. See <a id="idx:moduleproperty2:1481"></a><a class="pred" href="manipmodule.html#module_property/2">module_property/2</a>.
</dd>
</dl>
</dd>
</dl>
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