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It is provided "as is" without express or implied warranty. -- --><Head><Title>generate</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>generate</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 VAlign=top><b>Category</b>: algorithms</TD><TD Align=right VAlign=top><b>Component type</b>: function</TD></TR></Table><h3>Prototype</h3><pre>template <class <A href="ForwardIterator.html">ForwardIterator</A>, class <A href="Generator.html">Generator</A>>void generate(ForwardIterator first, ForwardIterator last, Generator gen);</pre> <h3>Description</h3><tt>Generate</tt> assigns the result of invoking <tt>gen</tt>, a <A href="functors.html">function object</A>that takes no arguments, to each element in the range <tt>[first,last)</tt>. <A href="#1">[1]</A><h3>Definition</h3>Defined in the standard header <A href="algorithm">algorithm</A>, and in the nonstandardbackward-compatibility header <A href="algo.h">algo.h</A>.<h3>Requirements on types</h3><UL><LI><tt>ForwardIterator</tt> is a model of <A href="ForwardIterator.html">Forward Iterator</A>. <A href="#2">[2]</A><LI><tt>ForwardIterator</tt> is mutable.<LI><tt>Generator</tt> is a model of <A href="Generator.html">Generator</A>.<LI><tt>Generator</tt>'s result type is convertible to <tt>ForwardIterator</tt>'s value type.</UL><h3>Preconditions</h3><UL><LI><tt>[first, last)</tt> is a valid range.</UL><h3>Complexity</h3>Linear. Exactly <tt>last - first</tt> invocations of <tt>gen</tt>. <A href="#1">[1]</A><h3>Example</h3>Fill a vector with random numbers, using the standard C library function<tt>rand</tt>.<pre>vector<int> V;...generate(V.begin(), V.end(), rand);</pre><h3>Notes</h3><P><A name="1">[1]</A>The <A href="functors.html">function object</A> <tt>gen</tt> is invoked for each iterator inthe range <tt>[first, last)</tt>, as opposed to just being invoked asingle time outside the loop. This distinction is importantbecause a <A href="Generator.html">Generator</A> need not return the same result each timeit is invoked; it is permitted to read from a file, refer to andmodify local state, and so on.<P><A name="2">[2]</A>The reason that <tt>generate</tt> requires its argument to be a mutable<A href="ForwardIterator.html">Forward Iterator</A>, rather than just an <A href="OutputIterator.html">Output Iterator</A>, is that it uses a range <tt>[first, last)</tt> of iterators. There is no sensibleway to describe a range of <A href="OutputIterator.html">Output Iterators</A>, because it isimpossible to compare two <A href="OutputIterator.html">Output Iterators</A> for equality.The <tt><A href="generate_n.html">generate_n</A></tt> algorithm does have an interface that permits use ofan <A href="OutputIterator.html">Output Iterator</A>.<h3>See also</h3><tt><A href="copy.html">copy</A></tt>, <tt><A href="fill.html">fill</A></tt>, <tt><A href="fill_n.html">fill_n</A></tt>, <tt><A href="generate_n.html">generate_n</A></tt>, <tt><A href="iota.html">iota</A></tt><!-- 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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