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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>advance</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>advance</H1><Table CellPadding=0 CellSpacing=0 width=100%><TR><TD Align=left><Img src = "algorithms.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD><TD Align=right><Img src = "function.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD></TR><TR><TD Align=left><Img src = "iterators.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD><TD Align=right></TD></TR><TR><TD Align=left VAlign=top><b>Categories</b>: algorithms, iterators</TD><TD Align=right VAlign=top><b>Component type</b>: function</TD></TR></Table><h3>Prototype</h3><pre>template <class <A href="InputIterator.html">InputIterator</A>, class Distance>void advance(InputIterator& i, Distance n);</pre> <h3>Description</h3><tt>Advance(i, n)</tt> increments the iterator <tt>i</tt> by the distance <tt>n</tt>. If <tt>n > 0</tt> it is equivalentto executing <tt>++i</tt> <tt>n</tt> times, and if <tt>n < 0</tt> it is equivalent toexecuting <tt>--i</tt> <tt>n</tt> times. If <tt>n == 0</tt>, the call has no effect.<h3>Definition</h3>Defined in the standard header <A href="iterator">iterator</A>, and in thenonstandard backward-compatibility header <A href="iterator.h">iterator.h</A>.<h3>Requirements on types</h3><UL><LI><tt>InputIterator</tt> is a model of <A href="InputIterator.html">Input Iterator</A>.<LI><tt>Distance</tt> is an integral type that is convertible to <tt>InputIterator</tt>'s distance type.</UL><h3>Preconditions</h3><UL><LI><tt>i</tt> is nonsingular.<LI>Every iterator between <tt>i</tt> and <tt>i+n</tt> (inclusive) is nonsingular.<LI>If <tt>InputIterator</tt> is a model of <A href="InputIterator.html">input iterator</A> or <A href="ForwardIterator.html">forward iterator</A>, then <tt>n</tt> must be nonnegative. If <tt>InputIterator</tt> is a model of <A href="BidirectionalIterator.html">bidirectional iterator</A> or <A href="RandomAccessIterator.html">random access iterator</A>, then this precondition does not apply.</UL><h3>Complexity</h3>Constant time if <tt>InputIterator</tt> is a model of <A href="RandomAccessIterator.html">random access iterator</A>, otherwise linear time.<h3>Example</h3><pre><A href="List.html">list</A><int> L;L.push_back(0);L.push_back(1);<A href="List.html">list</A><int>::iterator i = L.begin();advance(i, 2);assert(i == L.end());</pre><h3>Notes</h3><h3>See also</h3><tt><A href="distance.html">distance</A></tt>, <A href="InputIterator.html">Input iterator</A>, <A href="BidirectionalIterator.html">Bidirectional Iterator</A>,<A href="RandomAccessIterator.html">Random access iterator</A>, <tt><A href="iterator_traits.html">iterator_traits</A></tt>, <A href="Iterators.html">Iterator overview</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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