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<H3 CLASS="subsection"><A NAME="htoc316">8.4</A>  Type testing</H3><UL>
<LI><A HREF="gprolog058.html#toc260"><TT>fd_var/1</TT>, <TT>non_fd_var/1</TT>,
<TT>generic_var/1</TT>,
<TT>non_generic_var/1</TT></A>
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<H4 CLASS="subsubsection"><A NAME="toc260"></A><A NAME="htoc317">8.4.1</A>  <TT>fd_var/1</TT>, <TT>non_fd_var/1</TT>,
<TT>generic_var/1</TT>,
<TT>non_generic_var/1</TT></H4><P><B>Templates</B></P><DL CLASS="list"><DT CLASS="dt-list">
</DT><DD CLASS="dd-list"><TT>
fd_var(?term)<BR>
non_fd_var(?term)<BR>
generic_var(?term)<BR>
non_generic_var(?term)</TT></DD></DL><P><B>Description</B></P><P><TT>fd_var(Term)</TT> succeeds if <TT>Term</TT> is currently an
FD variable.</P><P><TT>non_fd_var(Term)</TT> succeeds if <TT>Term</TT> is
currently not an FD variable (opposite of <TT>fd_var/1</TT>).</P><P><TT>generic_var(Term)</TT> succeeds if <TT>Term</TT> is
either a Prolog variable or an FD variable.</P><P><TT>non_generic_var(Term)</TT> succeeds if
<TT>Term</TT> is neither a Prolog variable nor an FD variable
(opposite of <TT>generic_var/1</TT>).</P><P><B>Errors</B></P><P>None.</P><P><B>Portability</B></P><P>GNU Prolog predicate.</P>
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