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Type testing
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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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<A NAME="toc260"></A>
<H4 CLASS="subsubsection"><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>
<B>Templates</B>
<DL CLASS="list" COMPACT="compact"><DT CLASS="dt-list"><DD CLASS="dd-list"><TT>
fd_var(?term)<BR>
non_fd_var(?term)<BR>
generic_var(?term)<BR>
non_generic_var(?term)</TT></DL>
<B>Description</B><BR>
<BR>
<TT>fd_var(Term)</TT> succeeds if <TT>Term</TT> is currently an
FD variable.<BR>
<BR>
<TT>non_fd_var(Term)</TT> succeeds if <TT>Term</TT> is
currently not an FD variable (opposite of <TT>fd_var/1</TT>).<BR>
<BR>
<TT>generic_var(Term)</TT> succeeds if <TT>Term</TT> is
either a Prolog variable or an FD variable.<BR>
<BR>
<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>).<BR>
<BR>
<B>Errors</B><BR>
<BR>
None.<BR>
<BR>
<B>Portability</B><BR>
<BR>
GNU Prolog predicate.<BR>
<BR>
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