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<HTML><!-- -- Copyright (c) 1996-1999 -- Silicon Graphics Computer Systems, Inc. -- -- Permission to use, copy, modify, distribute and sell this software -- and its documentation for any purpose is hereby granted without fee, -- provided that the above copyright notice appears in all copies and -- that both that copyright notice and this permission notice appear -- in supporting documentation. Silicon Graphics makes no -- representations about the suitability of this software for any -- purpose. It is provided "as is" without express or implied warranty. -- -- Copyright (c) 1994 -- Hewlett-Packard Company -- -- Permission to use, copy, modify, distribute and sell this software -- and its documentation for any purpose is hereby granted without fee, -- provided that the above copyright notice appears in all copies and -- that both that copyright notice and this permission notice appear -- in supporting documentation. 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It is provided "as is" without express or implied warranty. -- --><Head><Title>Forward Container</Title><!-- Generated by htmldoc --></HEAD><BODY TEXT="#000000" LINK="#006600" ALINK="#003300" VLINK="#7C7F87" BGCOLOR="#FFFFFF"><A HREF="/"><IMG SRC="/images/common/sgilogo_small.gif" ALT="SGI Logo" WIDTH="80" HEIGHT="72" BORDER="0"></A><P><!--end header--><BR Clear><H1>Forward Container</H1><Table CellPadding=0 CellSpacing=0 width=100%><TR><TD Align=left><Img src = "containers.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD><TD Align=right><Img src = "concept.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD></TR><TR><TD Align=left VAlign=top><b>Category</b>: containers</TD><TD Align=right VAlign=top><b>Component type</b>: concept</TD></TR></Table><h3>Description</h3>A Forward Container is a <A href="Container.html">Container</A> whoseelements are arranged in a definite order: the ordering will notchange spontaneously from iteration to iteration. The requirement ofa definite ordering allows the definition of element-by-elementequality (if the container's element type is<A href="EqualityComparable.html">Equality Comparable</A>) and oflexicographical ordering (if the container's element type is<A href="LessThanComparable.html">LessThan Comparable</A>).<P>Iterators into a Forward Container satisfy the <A href="ForwardIterator.html">forward iterator</A> requirements;consequently, Forward Containers support multipass algorithms andallow multiple iterators into the same container to be active at thesame time.<h3>Refinement of</h3><A href="Container.html">Container</A>,<A href="EqualityComparable.html">EqualityComparable</A>,<A href="LessThanComparable.html">LessThanComparable</A><h3>Associated types</h3>No additional types beyond those defined in<A href="Container.html">Container</A>. However, the requirements forthe iterator type are strengthened: the iterator type must be a modelof <A href="ForwardIterator.html">Forward Iterator</A>.<h3>Notation</h3><Table><TR><TD VAlign=top><tt>X</tt></TD><TD VAlign=top>A type that is a model of Forward Container</TD></TR><TR><TD VAlign=top><tt>a</tt>, <tt>b</tt></TD><TD VAlign=top>Object of type <tt>X</tt></TD></TR><TR><TD VAlign=top><tt>T</tt></TD><TD VAlign=top>The value type of <tt>X</tt></TD></tr></table><h3>Definitions</h3><h3>Valid expressions</h3>In addition to the expressions defined in<A href="Container.html">Container</A>,<A href="EqualityComparable.html">EqualityComparable</A>, and <A href="LessThanComparable.html">LessThanComparable</A>, the followingexpressions must be valid.<Table border><TR><TH>Name</TH><TH>Expression</TH><TH>Type requirements</TH><TH>Return type</TH></TR><TR><TD VAlign=top>Equality</TD><TD VAlign=top><tt>a == b</tt></TD><TD VAlign=top><tt>T</tt> is <A href="EqualityComparable.html">EqualityComparable</A></TD><TD VAlign=top>Convertible to <tt>bool</tt></TD></TR><TR><TD VAlign=top>Inequality</TD><TD VAlign=top><tt>a != b</tt></TD><TD VAlign=top><tt>T</tt> is <A href="EqualityComparable.html">EqualityComparable</A></TD><TD VAlign=top>Convertible to <tt>bool</tt></TD></TR><TR><TD VAlign=top>Less</TD><TD VAlign=top><tt>a < b</tt></TD><TD VAlign=top><tt>T</tt> is <A href="LessThanComparable.html">LessThanComparable</A></TD><TD VAlign=top>Convertible to <tt>bool</tt></TD></TR><TR><TD VAlign=top>Greater</TD><TD VAlign=top><tt>a > b</tt></TD><TD VAlign=top><tt>T</tt> is <A href="LessThanComparable.html">LessThanComparable</A></TD><TD VAlign=top>Convertible to <tt>bool</tt></TD></TR><TR><TD VAlign=top>Less or equal</TD><TD VAlign=top><tt>a <= b</tt></TD><TD VAlign=top><tt>T</tt> is <A href="LessThanComparable.html">LessThanComparable</A></TD><TD VAlign=top>Convertible to <tt>bool</tt></TD></TR><TR><TD VAlign=top>Greater or equal</TD><TD VAlign=top><tt>a >= b</tt></TD><TD VAlign=top><tt>T</tt> is <A href="LessThanComparable.html">LessThanComparable</A></TD><TD VAlign=top>Convertible to <tt>bool</tt></TD></tr></table><h3>Expression semantics</h3>Semantics of an expression is defined only where it is not defined in<A href="Container.html">Container</A>,<A href="EqualityComparable.html">EqualityComparable</A>, or<A href="LessThanComparable.html">LessThanComparable</A>, or where thereis additional information.<Table border><TR><TH>Name</TH><TH>Expression</TH><TH>Precondition</TH><TH>Semantics</TH><TH>Postcondition</TH></TR><TR><TD VAlign=top>Equality</TD><TD VAlign=top><tt>a == b</tt></TD><TD VAlign=top> </TD><TD VAlign=top>Returns <tt>true</tt> if <tt>a.size() == b.size()</tt> and if each element of <tt>a</tt> compares equal to the corresponding element of <tt>b</tt>. Otherwise returns <tt>false</tt>.</TD><TD VAlign=top> </TD></TR><TR><TD VAlign=top>Less</TD><TD VAlign=top><tt>a < b</tt></TD><TD VAlign=top> </TD><TD VAlign=top>Equivalent to <tt><A href="lexicographical_compare.html">lexicographical_compare</A>(a,b)</tt></TD><TD VAlign=top> </TD></tr></table><h3>Complexity guarantees</h3>The equality and inequality operations are linear in the container's size.<h3>Invariants</h3><Table border><TR><TD VAlign=top>Ordering</TD><TD VAlign=top>Two different iterations through a forward container will access its elements in the same order, providing that there have been no intervening mutative operations.</TD></tr></table><h3>Models</h3><UL><LI> <A href="Vector.html">vector</A><LI> <A href="List.html">list</A><LI> <A href="Slist.html">slist</A><LI> <A href="Deque.html">deque</A><LI> <A href="set.html">set</A><LI> <A href="hash_set.html">hash_set</A><LI> <A href="Map.html">map</A><LI> <A href="hash_map.html">hash_map</A><LI> <A href="multiset.html">multiset</A><LI> <A href="hash_multiset.html">hash_multiset</A><LI> <A href="Multimap.html">multimap</A><LI> <A href="hash_multimap.html">hash_multimap</A></UL><h3>Notes</h3><h3>See also</h3>The <A href="Iterators.html">iterator overview</A>,<A href="ForwardIterator.html">Forward Iterator</A>, <A href="Sequence.html">Sequence</A><!-- start footer --><!-- Footer Begins --><STYLE TYPE="text/css"><!--TD.footer, TD.footer A{ font-family: Arial, helvetica, sans-serif; font-size: 8pt;}A.home {font-family: Arial, helvetica, sans-serif;}--></STYLE><P><A CLASS="home" HREF="index.html">STL Home</A><P><TABLE WIDTH="600" CELLPADDING="0" CELLPADDING="0" BORDER="0"> <TR> <TD ALIGN="RIGHT" CLASS="footer"><A HREF="/company_info/terms.html" TARGET="_top">terms of use</A> | <A HREF="/company_info/privacy.html" TARGET="_top">privacy policy</A></TD> <TD ALIGN="CENTER" CLASS="footer"> | </TD> <TD ALIGN="LEFT" CLASS="footer"><A HREF="/cgi-bin/feedback/" TARGET="_top">contact us</A></TD> </TR><TR> <TD ALIGN="RIGHT" CLASS="footer">Copyright © 1993-2003 Silicon Graphics, Inc. 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