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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. Hewlett-Packard Company makes no -- representations about the suitability of this software for any -- purpose. It is provided "as is" without express or implied warranty. -- --><Head><Title>generate</Title><!-- Generated by htmldoc --></HEAD><BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b" ALINK="#ff0000"> <IMG SRC="CorpID.gif" ALT="SGI" HEIGHT="43" WIDTH="151"> <!--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--> <HR SIZE="6"><A href="http://www.sgi.com/"><IMG SRC="surf.gif" HEIGHT="54" WIDTH="54" ALT="[Silicon Surf]"></A><A HREF="index.html"><IMG SRC="stl_home.gif" HEIGHT="54" WIDTH="54" ALT="[STL Home]"></A><BR><FONT SIZE="-2"><A href="http://www.sgi.com/Misc/sgi_info.html" TARGET="_top">Copyright © 1999 Silicon Graphics, Inc.</A> All Rights Reserved.</FONT><FONT SIZE="-3"><a href="http://www.sgi.com/Misc/external.list.html" TARGET="_top">TrademarkInformation</A></FONT><P></BODY></HTML> ⌨️ 快捷键说明
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