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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>find_if</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>find_if</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="InputIterator.html">InputIterator</A>, class <A href="Predicate.html">Predicate</A>>InputIterator find_if(InputIterator first, InputIterator last, Predicate pred);</pre> <h3>Description</h3>Returns the first iterator <tt>i</tt> in the range <tt>[first, last)</tt> such that<tt>pred(*i)</tt> is true. Returns <tt>last</tt> if no such iterator exists.<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>Predicate is a model of <A href="Predicate.html">Predicate</A>.<LI>InputIterator is a model of <A href="InputIterator.html">InputIterator</A>.<LI>The value type of InputIterator is convertible to the argument type of Predicate.</UL><h3>Preconditions</h3><UL><LI><tt>[first, last)</tt> is a valid range.<LI>For each iterator <tt>i</tt> in the range <tt>[first, last)</tt>, *i is in the domain of Predicate. </UL><h3>Complexity</h3>Linear: at most <tt>last - first</tt> applications of <tt>Pred</tt>.<h3>Example</h3><pre><A href="List.html">list</A><int> L;L.push_back(-3);L.push_back(0);L.push_back(3);L.push_back(-2);<A href="List.html">list</A><int>::iterator result = find_if(L.begin(), L.end(), bind2nd(greater<int>(), 0));assert(result == L.end() || *result > 0);</pre><h3>Notes</h3><h3>See also</h3><A href="find.html">find</A>.<!--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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