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It is provided "as is" without express or implied warranty. -- --><Head><Title>Random Access 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>Random Access 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 Random Access Container is a <A href="ReversibleContainer.html">Reversible Container</A> whose iterator type is a <A href="RandomAccessIterator.html">Random Access Iterator</A>.It provides amortized constant time access to arbitrary elements.<h3>Refinement of</h3><A href="ReversibleContainer.html">Reversible Container</A><h3>Associated types</h3>No additional types beyond those defined in <A href="ReversibleContainer.html">Reversible Container</A>.However, the requirements for the iterator type are strengthened:it must be a <A href="RandomAccessIterator.html">Random Access Iterator</A>.<h3>Notation</h3><Table><TR><TD VAlign=top><tt>X</tt></TD><TD VAlign=top>A type that is a model of Random Access 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="ReversibleContainer.html">Reversible Container</A>,the following expressions 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>Element access</TD><TD VAlign=top><tt>a[n]</tt></TD><TD VAlign=top><tt>n</tt> is convertible to <tt>size_type</tt></TD><TD VAlign=top><tt>reference</tt> if <tt>a</tt> is mutable, <tt>const_reference</tt> otherwise</TD></tr></table><h3>Expression semantics</h3>Semantics of an expression is defined only where it is not defined in<A href="ReversibleContainer.html">Reversible 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>Element access</TD><TD VAlign=top><tt>a[n]</tt></TD><TD VAlign=top><tt>0 <= n < a.size()</tt></TD><TD VAlign=top>Returns the <tt>n</tt>th element from the beginning of the container.</TD><TD VAlign=top> </TD></tr></table><h3>Complexity guarantees</h3>The run-time complexity of element access is amortized constant time.<h3>Invariants</h3><Table border><TR><TD VAlign=top>Element access</TD><TD VAlign=top>The element returned by <tt>a[n]</tt> is the same as the one obtained by incrementing <tt>a.begin()</tt> <tt>n</tt> times and then dereferencing the resulting iterator.</TD></tr></table><h3>Models</h3><UL><LI> <A href="Vector.html">vector</A><LI> <A href="Deque.html">deque</A></UL><h3>Notes</h3><h3>See also</h3>The <A href="Iterators.html">Iterator overview</A>, <A href="RandomAccessIterator.html">Random Access 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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