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extern/stdcxx/4.2.1/doc/stdlibref/forwarditerators.html
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extern/stdcxx/4.2.1/doc/stdlibref/forwarditerators.html
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<HTML>
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<HEAD>
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<TITLE>Forward Iterators</TITLE>
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<LINK REL=StyleSheet HREF="../rw.css" TYPE="text/css" TITLE="Apache stdcxx Stylesheet"></HEAD>
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<BODY BGCOLOR=#FFFFFF>
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<A HREF="for-each.html"><IMG SRC="images/bprev.gif" WIDTH=20 HEIGHT=21 ALT="Previous file" BORDER=O></A><A HREF="noframes.html"><IMG SRC="images/btop.gif" WIDTH=56 HEIGHT=21 ALT="Top of Document" BORDER=O></A><A HREF="booktoc.html"><IMG SRC="images/btoc.gif" WIDTH=56 HEIGHT=21 ALT="Contents" BORDER=O></A><A HREF="tindex.html"><IMG SRC="images/bindex.gif" WIDTH=56 HEIGHT=21 ALT="Index page" BORDER=O></A><A HREF="fpos.html"><IMG SRC="images/bnext.gif" WIDTH=25 HEIGHT=21 ALT="Next file" BORDER=O></A><DIV CLASS="DOCUMENTNAME"><B>Apache C++ Standard Library Reference Guide</B></DIV>
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<H2>Forward Iterators</H2>
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<P><B>Library:</B> <A HREF="2-8.html">Iterators</A></P><UL>
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<LI><A HREF="#sec1">Local Index</A></LI>
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<LI><A HREF="#sec2">Summary</A></LI>
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<LI><A HREF="#sec3">Description</A></LI>
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<LI><A HREF="#sec4">Key to Iterator Requirements</A></LI>
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<LI><A HREF="#sec5">Requirements for Forward Iterators</A></LI>
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<LI><A HREF="#sec6">See Also</A></LI>
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<LI><A HREF="#sec7">Standards Conformance</A></LI>
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</UL>
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<A NAME="sec1"><H3>Local Index</H3></A>
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No Entries
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<A NAME="sec2"><H3>Summary</H3></A>
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<P>A forward-moving iterator that can both read and write</P>
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<A NAME="sec3"><H3>Description</H3></A>
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<BLOCKQUOTE><HR><B>
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NOTE -- For a complete discussion of iterators, see the <B><I><A HREF="iterators.html">Iterators</A></I></B> section of this reference.
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</B><HR></BLOCKQUOTE>
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<P>Iterators are a generalization of pointers that allow a C++ program to uniformly interact with different data structures. Forward iterators are forward moving, and have the ability to both read and write data. These iterators satisfy the requirements listed below.</P>
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<A NAME="sec4"><H3>Key to Iterator Requirements</H3></A>
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<P>The following key pertains to the iterator requirements listed below: </P>
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<P><TABLE CELLPADDING=3 BORDER=0>
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<TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>a and b </P></TD>
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<TD CLASS="LIST"><P CLASS="LIST"></SAMP>values of type <SAMP>X</SAMP></P></TD></TR>
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<TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>n </P></TD>
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<TD CLASS="LIST"><P CLASS="LIST"></SAMP>value representing a <SAMP>distance</SAMP> between two iterators</P></TD></TR>
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<TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>u, Distance, tmp and m </P></TD>
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<TD CLASS="LIST"><P CLASS="LIST"></SAMP>identifiers</P></TD></TR>
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<TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>r </P></TD>
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<TD CLASS="LIST"><P CLASS="LIST"></SAMP>value of type <SAMP>X&</SAMP></P></TD></TR>
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<TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>t </P></TD>
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<TD CLASS="LIST"><P CLASS="LIST"></SAMP>value of type <SAMP>T</SAMP></P></TD></TR>
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</TABLE></P>
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<A NAME="sec5"><H3>Requirements for Forward Iterators</H3></A>
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<P>The following expressions must be valid for forward iterators:</P>
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<P><TABLE CELLPADDING=3 BORDER=0>
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<TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>X u </P></TD>
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<TD CLASS="LIST"><P CLASS="LIST">u</SAMP> might have a singular value</P></TD></TR>
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<TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>X() </P></TD>
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<TD CLASS="LIST"><P CLASS="LIST">X()</SAMP> might be singular</P></TD></TR>
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<TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>X(a) </P></TD>
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<TD CLASS="LIST"><P CLASS="LIST"></SAMP>copy constructor, <SAMP>a == X(a)</SAMP></P></TD></TR>
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<TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>X u(a) </P></TD>
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<TD CLASS="LIST"><P CLASS="LIST"></SAMP>copy constructor, <SAMP>u == a</SAMP></P></TD></TR>
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<TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>X u = a </P></TD>
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<TD CLASS="LIST"><P CLASS="LIST"></SAMP>assignment, <SAMP>u == a</SAMP></P></TD></TR>
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<TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>a == b, a != b </P></TD>
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<TD CLASS="LIST"><P CLASS="LIST"></SAMP>return value convertible to <SAMP>bool</SAMP></P></TD></TR>
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<TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>*a </P></TD>
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<TD CLASS="LIST"><P CLASS="LIST"></SAMP>return value convertible to <SAMP>T&</SAMP></P></TD></TR>
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<TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>a->m </P></TD>
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<TD CLASS="LIST"><P CLASS="LIST"></SAMP>equivalent to <SAMP>(*a).m</SAMP></P></TD></TR>
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<TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>++r </P></TD>
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<TD CLASS="LIST"><P CLASS="LIST"></SAMP>returns <SAMP>X&</SAMP></P></TD></TR>
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<TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>r++ </P></TD>
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<TD CLASS="LIST"><P CLASS="LIST"></SAMP>return value convertible to const <SAMP>X&</SAMP></P></TD></TR>
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<TR CLASS="LIST"><TD VALIGN="top" CLASS="LIST"><P CLASS="LIST"><SAMP>*r++ </P></TD>
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<TD CLASS="LIST"><P CLASS="LIST"></SAMP>returns <SAMP>T&</SAMP></P></TD></TR>
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</TABLE></P>
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<P>Forward iterators have the condition that <SAMP>a == b</SAMP> implies <SAMP>*a == *b</SAMP>.</P>
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<P>There are no restrictions on the number of passes an algorithm may make through the structure.</P>
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<A NAME="sec6"><H3>See Also</H3></A>
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<P><A HREF="iterators.html">Iterators</A>, <A HREF="bidirectionaliterators.html">Bidirectional Iterators</A></P>
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<A NAME="sec7"><H3>Standards Conformance</H3></A>
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<P><I>ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 24.1.3</I></P>
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