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FD variable information
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<H3 CLASS="subsection"><A NAME="htoc318">8.5</A> FD variable information</H3><UL>
<LI><A HREF="gprolog059.html#toc261"><TT>fd_min/2</TT>,
<TT>fd_max/2</TT>,
<TT>fd_size/2</TT>,
<TT>fd_dom/2</TT></A>
<LI><A HREF="gprolog059.html#toc262"><TT>fd_has_extra_cstr/1</TT>,
<TT>fd_has_vector/1</TT>,
<TT>fd_use_vector/1</TT></A>
</UL>
These predicate allow the user to get some information about FD variables.
They are not constraints, they only return the current state of a variable.<BR>
<BR>
<A NAME="toc261"></A>
<H4 CLASS="subsubsection"><A NAME="htoc319">8.5.1</A> <TT>fd_min/2</TT>,
<TT>fd_max/2</TT>,
<TT>fd_size/2</TT>,
<TT>fd_dom/2</TT></H4>
<B>Templates</B>
<DL CLASS="list" COMPACT="compact"><DT CLASS="dt-list"><DD CLASS="dd-list"><TT>
fd_min(+fd_variable, ?integer)<BR>
fd_max(+fd_variable, ?integer)<BR>
fd_size(+fd_variable, ?integer)<BR>
fd_dom(+fd_variable, ?integer_list)</TT></DL>
<B>Description</B><BR>
<BR>
<TT>fd_min(X, N)</TT> succeeds if <TT>N</TT> is the minimal value of the
current domain of <TT>X</TT>.<BR>
<BR>
<TT>fd_max(X, N)</TT> succeeds if <TT>N</TT> is the maximal value of the
current domain of <TT>X</TT>.<BR>
<BR>
<TT>fd_size(X, N)</TT> succeeds if <TT>N</TT> is the number of elements of
the current domain of <TT>X</TT>.<BR>
<BR>
<TT>fd_dom(X, Values)</TT> succeeds if <TT>Values</TT> is the list of
values of the current domain of <TT>X</TT>.<BR>
<BR>
<B>Errors</B><BR>
<TABLE CELLSPACING=2 CELLPADDING=0>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR>
<TR><TD VALIGN=top ALIGN=left><TT>X</TT> is a variable</TD>
<TD VALIGN=top ALIGN=center NOWRAP> </TD>
<TD VALIGN=top ALIGN=left><TT>instantiation_error</TT></TD>
</TR>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR>
<TR><TD VALIGN=top ALIGN=left><TT>X</TT> is neither an FD variable nor an integer</TD>
<TD VALIGN=top ALIGN=center NOWRAP> </TD>
<TD VALIGN=top ALIGN=left><TT>type_error(fd_variable, X)</TT></TD>
</TR>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR>
<TR><TD VALIGN=top ALIGN=left><TT>N</TT> is neither a variable nor an integer</TD>
<TD VALIGN=top ALIGN=center NOWRAP> </TD>
<TD VALIGN=top ALIGN=left><TT>type_error(integer, N)</TT></TD>
</TR>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR>
<TR><TD VALIGN=top ALIGN=left>an element <TT>E</TT> of the <TT>Vars</TT> list is neither a
variable nor an FD variable nor an integer</TD>
<TD VALIGN=top ALIGN=center NOWRAP> </TD>
<TD VALIGN=top ALIGN=left><TT>type_error(fd_variable, E)</TT></TD>
</TR>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR>
<TR><TD VALIGN=top ALIGN=left><TT>Values</TT> is neither a partial list nor a list</TD>
<TD VALIGN=top ALIGN=center NOWRAP> </TD>
<TD VALIGN=top ALIGN=left><TT>type_error(list, Values)</TT></TD>
</TR>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR></TABLE><BR>
<B>Portability</B><BR>
<BR>
GNU Prolog predicate.<BR>
<BR>
<A NAME="toc262"></A>
<H4 CLASS="subsubsection"><A NAME="htoc320">8.5.2</A> <TT>fd_has_extra_cstr/1</TT>,
<TT>fd_has_vector/1</TT>,
<TT>fd_use_vector/1</TT></H4>
<B>Templates</B>
<DL CLASS="list" COMPACT="compact"><DT CLASS="dt-list"><DD CLASS="dd-list"><TT>
fd_has_extra_cstr(+fd_variable)<BR>
fd_has_vector(+fd_variable)<BR>
fd_use_vector(+fd_variable)</TT></DL>
<B>Description</B><BR>
<BR>
<TT>fd_has_extra_cstr(X)</TT> succeeds if the <TT>extra_cstr</TT>
of <TT>X</TT> is currently on (section <A HREF="gprolog055.html#Intro-FD">8.1</A>).<BR>
<BR>
<TT>fd_has_vector(X)</TT> succeeds if the current domain of <TT>X</TT>
uses a sparse representation (section <A HREF="gprolog055.html#Intro-FD">8.1</A>).<BR>
<BR>
<TT>fd_use_vector(X)</TT> enforces a sparse representation for the domain
of <TT>X</TT> (section <A HREF="gprolog055.html#Intro-FD">8.1</A>).<BR>
<BR>
<B>Errors</B><BR>
<TABLE CELLSPACING=2 CELLPADDING=0>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR>
<TR><TD VALIGN=top ALIGN=left><TT>X</TT> is a variable</TD>
<TD VALIGN=top ALIGN=center NOWRAP> </TD>
<TD VALIGN=top ALIGN=left><TT>instantiation_error</TT></TD>
</TR>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR>
<TR><TD VALIGN=top ALIGN=left><TT>X</TT> is neither an FD variable nor an integer</TD>
<TD VALIGN=top ALIGN=center NOWRAP> </TD>
<TD VALIGN=top ALIGN=left><TT>type_error(fd_variable, X)</TT></TD>
</TR>
<TR><TD BGCOLOR=black COLSPAN=3><TABLE BORDER=0 WIDTH="100%" CELLSPACING=0 CELLPADDING=1><TR><TD></TD></TR></TABLE></TD>
</TR></TABLE><BR>
<B>Portability</B><BR>
<BR>
GNU Prolog predicates.<BR>
<BR>
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