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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. Hewlett-Packard Company makes no -- representations about the suitability of this software for any -- purpose. It is provided "as is" without express or implied warranty. -- --><Head><Title>Reversible Container</Title><!-- Generated by htmldoc --></HEAD><BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b" ALINK="#ff0000"> <IMG SRC="CorpID.gif" ALT="SGI" HEIGHT="43" WIDTH="151"> <!--end header--><BR Clear><H1>Reversible 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 Reversible Container is a <A href="ForwardContainer.html">Forward Container</A> whose iterators are<A href="BidirectionalIterator.html">Bidirectional Iterators</A>. It allows backwards iteration throughthe container.<h3>Refinement of</h3><A href="ForwardContainer.html">Forward Container</A><h3>Associated types</h3>Two new types are introduced. In addition, the iterator type and theconst iterator type must satisfy a more stringent requirement thanfor a <A href="ForwardContainer.html">Forward Container</A>. The iterator and reverse iterator types mustbe <A href="BidirectionalIterator.html">Bidirectional Iterators</A>, not merely <A href="ForwardIterator.html">Forward Iterators</A>.<Table border><TR><TD VAlign=top>Reverse iterator type</TD><TD VAlign=top><tt>X::reverse_iterator</tt></TD><TD VAlign=top>A <A href="ReverseIterator.html">Reverse Iterator</A> adaptor whose base iterator type is the container's iterator type. Incrementing an object of type <tt>reverse_iterator</tt> moves backwards through the container: the <A href="ReverseIterator.html">Reverse Iterator</A> adaptor maps <tt>operator++</tt> to <tt>operator--</tt>.</TD></TR><TR><TD VAlign=top>Const reverse iterator type</TD><TD VAlign=top><tt>X::const_reverse_iterator</tt></TD><TD VAlign=top>A <A href="ReverseIterator.html">Reverse Iterator</A> adaptor whose base iterator type is the container's const iterator type. <A href="#1">[1]</A></TD></tr></table><h3>Notation</h3><Table><TR><TD VAlign=top><tt>X</tt></TD><TD VAlign=top>A type that is a model of Reversible 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></table><h3>Definitions</h3><h3>Valid expressions</h3>In addition to the expressions defined in <A href="ForwardContainer.html">Forward Container</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>Beginning of range</TD><TD VAlign=top><tt>a.rbegin()</tt></TD><TD VAlign=top> </TD><TD VAlign=top><tt>reverse_iterator</tt> if <tt>a</tt> is mutable, <tt>const_reverse_iterator</tt> otherwise <A href="#1">[1]</A></TD></TR><TR><TD VAlign=top>End of range</TD><TD VAlign=top><tt>a.rend()</tt></TD><TD VAlign=top> </TD><TD VAlign=top><tt>reverse_iterator</tt> if <tt>a</tt> is mutable, <tt>const_reverse_iterator</tt> otherwise <A href="#1">[1]</A></TD></tr></table><h3>Expression semantics</h3>Semantics of an expression is defined only where it is not defined in<A href="ForwardContainer.html">Forward Container</A>, or where there is 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>Beginning of reverse range</TD><TD VAlign=top><tt>a.rbegin()</tt></TD><TD VAlign=top> </TD><TD VAlign=top>Equivalent to <tt>X::reverse_iterator(a.end())</tt>.</TD><TD VAlign=top><tt>a.rbegin()</tt> is dereferenceable or past-the-end. It is past-the-end if and only if <tt>a.size() == 0</tt>.</TD></TR><TR><TD VAlign=top>End of reverse range</TD><TD VAlign=top><tt>a.rend()</tt></TD><TD VAlign=top> </TD><TD VAlign=top>Equivalent to <tt>X::reverse_iterator(a.begin())</tt>.</TD><TD VAlign=top><tt>a.end()</tt> is past-the-end.</TD></tr></table><h3>Complexity guarantees</h3>The run-time complexity of <tt>rbegin()</tt> and <tt>rend()</tt> is amortized constant time.<h3>Invariants</h3><Table border><TR><TD VAlign=top>Valid range</TD><TD VAlign=top><tt>[a.rbegin(), a.rend())</tt> is a valid range.</TD></TR><TR><TD VAlign=top>Equivalence of ranges</TD><TD VAlign=top>The distance from <tt>a.begin()</tt> to <tt>a.end()</tt> is the same as the distance from <tt>a.rbegin()</tt> to <tt>a.rend()</tt>.</TD></tr></table><h3>Models</h3><UL><LI> <A href="Vector.html">vector</A><LI> <A href="List.html">list</A><LI> <A href="Deque.html">deque</A></UL><h3>Notes</h3><P><A name="1">[1]</A>A <A href="Container.html">Container</A>'s iterator type and const iterator type may be thesame type: a container need not provide mutable iterators. It follows from this that the reverse iterator type andthe const reverse iterator type may also be the same.<h3>See also</h3>The <A href="Iterators.html">Iterator overview</A>, <A href="BidirectionalIterator.html">Bidirectional Iterator</A>, <A href="Sequence.html">Sequence</A><!--start footer--> <HR SIZE="6"><A href="http://www.sgi.com/"><IMG SRC="surf.gif" HEIGHT="54" WIDTH="54" ALT="[Silicon Surf]"></A><A HREF="index.html"><IMG SRC="stl_home.gif" HEIGHT="54" WIDTH="54" ALT="[STL Home]"></A><BR><FONT SIZE="-2"><A href="http://www.sgi.com/Misc/sgi_info.html" TARGET="_top">Copyright © 1999 Silicon Graphics, Inc.</A> All Rights Reserved.</FONT><FONT SIZE="-3"><a href="http://www.sgi.com/Misc/external.list.html" TARGET="_top">TrademarkInformation</A></FONT><P></BODY></HTML> ?? 快捷鍵說明
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