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

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<H2><A NAME="sec:5.14"><SPAN class="sec-nr">5.14</SPAN> <SPAN class="sec-title">Query 
the module system</SPAN></A></H2>

<A NAME="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 NAME="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 NAME="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>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 NAME="idx:predicateproperty2:1286"></A><A class="pred" href="examineprog.html#predicate_property/2">predicate_property/2</A>.
</DD>
</DL>

</DD>
</DL>

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