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<H3 CLASS="subsection"><A NAME="htoc313">8.3</A>  Initial value constraints</H3><UL>
<LI><A HREF="gprolog057.html#toc258"><TT>fd_domain/3</TT>,
<TT>fd_domain_bool/1</TT></A>
</LI><LI><A HREF="gprolog057.html#toc259"><TT>fd_domain/2</TT></A>
</LI></UL>
<H4 CLASS="subsubsection"><A NAME="toc258"></A><A NAME="htoc314">8.3.1</A>  <TT>fd_domain/3</TT>,
<TT>fd_domain_bool/1</TT></H4><P><B>Templates</B></P><DL CLASS="list"><DT CLASS="dt-list">
</DT><DD CLASS="dd-list"><TT>
fd_domain(+fd_variable_list_or_fd_variable, +integer,
+integer)<BR>
fd_domain(?fd_variable, +integer, +integer)<BR>
fd_domain_bool(+fd_variable_list)<BR>
fd_domain_bool(?fd_variable)</TT></DD></DL><P><B>Description</B></P><P><TT>fd_domain(Vars, Lower, Upper)</TT> constraints each element <TT>X</TT>
of <TT>Vars</TT> to take a value in <TT>Lower..Upper</TT>. This
predicate is generally used to set the initial domain of variables to an
interval. <TT>Vars</TT> can be also a single FD variable (or a single Prolog
variable).</P><P><TT>fd_domain_bool(Vars)</TT> is equivalent to <TT>fd_domain(Vars, 0,
1)</TT> and is used to declare boolean FD variables.</P><P><B>Errors</B></P><TABLE CELLSPACING=6 CELLPADDING=0><TR><TD CLASS="hbar" COLSPAN=3></TD></TR>
<TR><TD VALIGN=top ALIGN=left>
<TT>Vars</TT> is not a variable but is a partial list</TD><TD VALIGN=top ALIGN=center NOWRAP>  </TD><TD VALIGN=top ALIGN=left><TT>instantiation_error</TT></TD></TR>
<TR><TD CLASS="hbar" COLSPAN=3></TD></TR>
<TR><TD VALIGN=top ALIGN=left>
<TT>Vars</TT> is neither a variable nor an FD variable nor an
integer nor a list</TD><TD VALIGN=top ALIGN=center NOWRAP>  </TD><TD VALIGN=top ALIGN=left><TT>type_error(list, Vars)</TT></TD></TR>
<TR><TD CLASS="hbar" COLSPAN=3></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 CLASS="hbar" COLSPAN=3></TD></TR>
<TR><TD VALIGN=top ALIGN=left>
<TT>Lower</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 CLASS="hbar" COLSPAN=3></TD></TR>
<TR><TD VALIGN=top ALIGN=left>
<TT>Lower</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, Lower)</TT></TD></TR>
<TR><TD CLASS="hbar" COLSPAN=3></TD></TR>
<TR><TD VALIGN=top ALIGN=left>
<TT>Upper</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 CLASS="hbar" COLSPAN=3></TD></TR>
<TR><TD VALIGN=top ALIGN=left>
<TT>Upper</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, Upper)</TT></TD></TR>
<TR><TD CLASS="hbar" COLSPAN=3></TD></TR>
</TABLE><P><B>Portability</B></P><P>GNU Prolog predicate.</P><H4 CLASS="subsubsection"><A NAME="toc259"></A><A NAME="htoc315">8.3.2</A>  <TT>fd_domain/2</TT></H4><P><B>Templates</B></P><DL CLASS="list"><DT CLASS="dt-list">
</DT><DD CLASS="dd-list"><TT>
fd_domain(+fd_variable_list, +integer_list)<BR>
fd_domain(?fd_variable, +integer_list)</TT></DD></DL><P><B>Description</B></P><P><TT>fd_domain(Vars, Values)</TT> constraints each element <TT>X</TT> of the
list <TT>Vars</TT> to take a value in the list <TT>Values</TT>. This
predicate is generally used to set the initial domain of variables to a set
of values. The domain of each variable of <TT>Vars</TT> uses a sparse
representation. <TT>Vars</TT> can be also a single FD variable (or a single
Prolog variable).</P><P><B>Errors</B></P><TABLE CELLSPACING=6 CELLPADDING=0><TR><TD CLASS="hbar" COLSPAN=3></TD></TR>
<TR><TD VALIGN=top ALIGN=left>
<TT>Vars</TT> is not a variable but is a partial list</TD><TD VALIGN=top ALIGN=center NOWRAP>  </TD><TD VALIGN=top ALIGN=left><TT>instantiation_error</TT></TD></TR>
<TR><TD CLASS="hbar" COLSPAN=3></TD></TR>
<TR><TD VALIGN=top ALIGN=left>
<TT>Vars</TT> is neither a variable nor an FD variable nor an
integer nor a list</TD><TD VALIGN=top ALIGN=center NOWRAP>  </TD><TD VALIGN=top ALIGN=left><TT>type_error(list, Vars)</TT></TD></TR>
<TR><TD CLASS="hbar" COLSPAN=3></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 CLASS="hbar" COLSPAN=3></TD></TR>
<TR><TD VALIGN=top ALIGN=left>
<TT>Values</TT> is a partial list or a list with an element
<TT>E</TT> which is a variable</TD><TD VALIGN=top ALIGN=center NOWRAP>  </TD><TD VALIGN=top ALIGN=left><TT>instantiation_error</TT></TD></TR>
<TR><TD CLASS="hbar" COLSPAN=3></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 CLASS="hbar" COLSPAN=3></TD></TR>
<TR><TD VALIGN=top ALIGN=left>
an element <TT>E</TT> of the <TT>Values</TT> list is neither a
variable nor an integer</TD><TD VALIGN=top ALIGN=center NOWRAP>  </TD><TD VALIGN=top ALIGN=left><TT>type_error(integer, E)</TT></TD></TR>
<TR><TD CLASS="hbar" COLSPAN=3></TD></TR>
</TABLE><P><B>Portability</B></P><P>GNU Prolog predicate.</P>
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