📄 find_first_of.html
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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. 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It is provided "as is" without express or implied warranty. -- --><Head><Title>find_first_of</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_first_of</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><tt>find_first_of</tt> is an overloaded name; there are actually two <tt>find_first_of</tt>functions.<pre>template <class <A href="InputIterator.html">InputIterator</A>, class <A href="ForwardIterator.html">ForwardIterator</A>>InputIterator find_first_of(InputIterator first1, InputIterator last1, ForwardIterator first2, ForwardIterator last2);template <class InputIterator, class ForwardIterator, class BinaryPredicate>InputIterator find_first_of(InputIterator first1, InputIterator last1, ForwardIterator first2, ForwardIterator last2, BinaryPredicate comp);</pre> <h3>Description</h3><tt>Find_first_of</tt> is similar to <tt><A href="find.html">find</A></tt>, in that it performs linearseach through a range of <A href="InputIterator.html">Input Iterators</A>. The difference is thatwhile <tt><A href="find.html">find</A></tt> searches for one particular value, <tt>find_first_of</tt>searches for any of several values. Specifically, <tt>find_first_of</tt> searches for the first occurrance in the range <tt>[first1, last1)</tt>of any of the elements in <tt>[first2, last2)</tt>. (Note that this behavior is reminiscent of the function <tt>strpbrk</tt> from the standardC library.)<P>The two versions of <tt>find_first_of</tt> differ in how they compareelements for equality. The first uses <tt>operator==</tt>, and the seconduses and arbitrary user-supplied <A href="functors.html">function object</A> <tt>comp</tt>. Thefirst version returns the first iterator <tt>i</tt> in <tt>[first1, last1)</tt> suchthat, for some iterator <tt>j</tt> in <tt>[first2, last2)</tt>, <tt>*i == *j</tt>. Thesecond returns the first iterator <tt>i</tt> in <tt>[first1, last1)</tt> such that,for some iterator <tt>j</tt> in <tt>[first2, last2)</tt>, <tt>comp(*i, *j)</tt> is <tt>true</tt>.As usual, both versions return <tt>last1</tt> if no such iterator <tt>i</tt>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>For the first version:<UL><LI><tt>InputIterator</tt> is a model of <A href="InputIterator.html">Input Iterator</A>.<LI><tt>ForwardIterator</tt> is a model of <A href="ForwardIterator.html">Forward Iterator</A>.<LI><tt>InputIterator</tt>'s value type is <A href="EqualityComparable.html">EqualityComparable</A>, and can be compared for equality with <A href="ForwardIterator.html">ForwardIterator</A>'s value type.</UL>For the second version:<UL><LI><tt>InputIterator</tt> is a model of <A href="InputIterator.html">Input Iterator</A>.<LI><tt>ForwardIterator</tt> is a model of <A href="ForwardIterator.html">Forward Iterator</A>.<LI><tt>BinaryPredicate</tt> is a model of <A href="BinaryPredicate.html">Binary Predicate</A>.<LI><tt>InputIterator</tt>'s value type is convertible to <tt>BinaryPredicate</tt>'s first argument type.<LI><tt>ForwardIterator</tt>'s value type is convertible to <tt>BinaryPredicate</tt>'s second argument type.</UL><h3>Preconditions</h3><UL><LI><tt>[first1, last1)</tt> is a valid range.<LI><tt>[first2, last2)</tt> is a valid range.</UL><h3>Complexity</h3>At most <tt>(last1 - first1) * (last2 - first2)</tt> comparisons.<h3>Example</h3>Like <tt>strpbrk</tt>, one use for <tt>find_first_of</tt> is finding whitespacein a string; space, tab, and newline are all whitespace characters.<pre>int main(){ const char* WS = "\t\n "; const int n_WS = strlen(WS); char* s1 = "This sentence contains five words."; char* s2 = "OneWord"; char* end1 = find_first_of(s1, s1 + strlen(s1), WS, WS + n_WS); char* end2 = find_first_of(s2, s2 + strlen(s2), WS, WS + n_WS); printf("First word of s1: %.*s\n", end1 - s1, s1); printf("First word of s2: %.*s\n", end2 - s2, s2); }</pre><h3>Notes</h3><h3>See also</h3><tt><A href="find.html">find</A></tt>, <tt><A href="find_if.html">find_if</A></tt>, <tt><A href="search.html">search</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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