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It is provided "as is" without express or implied warranty. -- --><Head><Title>ostream_iterator<T></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>ostream_iterator<T></H1><Table CellPadding=0 CellSpacing=0 width=100%><TR><TD Align=left><Img src = "iterators.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD><TD Align=right><Img src = "type.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD></TR><TR><TD Align=left VAlign=top><b>Category</b>: iterators</TD><TD Align=right VAlign=top><b>Component type</b>: type</TD></TR></Table><h3>Description</h3>An <tt>ostream_iterator</tt> is an <A href="OutputIterator.html">Output Iterator</A> that performs formattedoutput of objects of type <tt>T</tt> to a particular <tt>ostream</tt>. Note that all of therestrictions of an <A href="OutputIterator.html">Output Iterator</A> must be obeyed, including therestrictions on the ordering of <tt>operator*</tt> and <tt>operator++</tt>operations.<h3>Example</h3>Copy the elements of a <tt><A href="Vector.html">vector</A></tt> to the standard output, one per line.<pre><A href="Vector.html">vector</A><int> V;// ...<A href="copy.html">copy</A>(V.begin(), V.end(), ostream_iterator<int>(cout, "\n"));</pre><h3>Definition</h3>Defined in the standard header <A href="iterator">iterator</A>, and in the nonstandardbackward-compatibility header <A href="iterator.h">iterator.h</A>.<h3>Template parameters</h3><Table border><TR><TH>Parameter</TH><TH>Description</TH><TH>Default</TH></TR><TR><TD VAlign=top><tt>T</tt></TD><TD VAlign=top>The type of object that will be written to the <tt>ostream</tt>. The set of value types of an <tt>ostream_iterator</tt> consists of a single type, <tt>T</tt>.</TD><TD VAlign=top> </TD></tr></table><h3>Model of</h3><A href="OutputIterator.html">Output Iterator</A>.<h3>Type requirements</h3><tt>T</tt> must be a type such that <tt>cout << T</tt> is a valid expression.<h3>Public base classes</h3>None.<h3>Members</h3><Table border><TR><TH>Member</TH><TH>Where defined</TH><TH>Description</TH></TR><TR><TD VAlign=top><tt>ostream_iterator(ostream&)</tt></TD><TD VAlign=top><tt>ostream_iterator</tt></TD><TD VAlign=top>See below.</TD></TR><TR><TD VAlign=top><tt>ostream_iterator(ostream&, const char* s)</tt></TD><TD VAlign=top><tt>ostream_iterator</tt></TD><TD VAlign=top>See below.</TD></TR><TR><TD VAlign=top><tt>ostream_iterator(const ostream_iterator&)</tt></TD><TD VAlign=top> <A href="OutputIterator.html">Output Iterator</A></TD><TD VAlign=top>The copy constructor</TD></TR><TR><TD VAlign=top><tt>ostream_iterator& operator=(const ostream_iterator&)</tt></TD><TD VAlign=top> <A href="OutputIterator.html">Output Iterator</A></TD><TD VAlign=top>The assignment operator</TD></TR><TR><TD VAlign=top><tt>ostream_iterator& operator=(const T&)</tt></TD><TD VAlign=top> <A href="OutputIterator.html">Output Iterator</A></TD><TD VAlign=top>Used to implement the <A href="OutputIterator.html">Output Iterator</A> requirement <tt>*i = t</tt>. <A href="#1">[1]</A></TD></TR><TR><TD VAlign=top><tt>ostream_iterator& operator*()</tt></TD><TD VAlign=top> <A href="OutputIterator.html">Output Iterator</A></TD><TD VAlign=top>Used to implement the <A href="OutputIterator.html">Output Iterator</A> requirement <tt>*i = t</tt>. <A href="#1">[1]</A></TD></TR><TR><TD VAlign=top><tt>ostream_iterator& operator++()</tt></TD><TD VAlign=top> <A href="OutputIterator.html">Output Iterator</A></TD><TD VAlign=top>Preincrement</TD></TR><TR><TD VAlign=top><tt>ostream_iterator& operator++(int)</tt></TD><TD VAlign=top> <A href="OutputIterator.html">Output Iterator</A></TD><TD VAlign=top>Postincrement</TD></TR><TR><TD VAlign=top><tt>output_iterator_tag iterator_category(const ostream_iterator&)</tt></TD><TD VAlign=top> <A href="iterator_tags.html">iterator tags</A></TD><TD VAlign=top>Returns the iterator's category.</TD></tr></table><h3>New members</h3>These members are not defined in the <A href="OutputIterator.html">Output Iterator</A> requirements,but are specific to <tt>ostream_iterator</tt>.<Table border><TR><TH>Function</TH><TH>Description</TH></TR><TR><TD VAlign=top><tt>ostream_iterator(ostream& s)</tt></TD><TD VAlign=top>Creates an <tt>ostream_iterator</tt> such that assignment of <tt>t</tt> through it is equivalent to <tt>s << t</tt>.</TD></TR><TR><TD VAlign=top><tt>ostream_iterator(ostream& s, const char* delim)</tt></TD><TD VAlign=top>Creates an <tt>ostream_iterator</tt> such that assignment of <tt>t</tt> through it is equivalent to <tt>s << t << delim</tt>.</TD></tr></table><h3>Notes</h3><P><A name="1">[1]</A>Note how assignment through an <tt>ostream_iterator</tt> is implemented.In general, unary <tt>operator*</tt> must be defined so that it returns aproxy object, where the proxy object defines <tt>operator=</tt> to performthe output operation. In this case, for the sake of simplicity, theproxy object is the <tt>ostream_iterator</tt> itself. That is, <tt>*i</tt> simplyreturns <tt>i</tt>, and <tt>*i = t</tt> is equivalent to <tt>i = t</tt>. You should not,however, rely on this behavior. It is an implementation detail,and it is not guaranteed to remain the same in future versions.<h3>See also</h3><A href="istream_iterator.html">istream_iterator</A>, <A href="OutputIterator.html">Output Iterator</A>, <A href="InputIterator.html">Input Iterator</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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