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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>partial_sort_copy</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>partial_sort_copy</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>Partial_sort_copy</tt> is an overloaded name; there are actually two <tt>partial_sort_copy</tt>functions.<pre>template <class <A href="InputIterator.html">InputIterator</A>, class <A href="RandomAccessIterator.html">RandomAccessIterator</A>>RandomAccessIteratorpartial_sort_copy(InputIterator first, InputIterator last, RandomAccessIterator result_first, RandomAccessIterator result_last);template <class <A href="InputIterator.html">InputIterator</A>, class <A href="RandomAccessIterator.html">RandomAccessIterator</A>, class <A href="StrictWeakOrdering.html">StrictWeakOrdering</A>>RandomAccessIteratorpartial_sort_copy(InputIterator first, InputIterator last, RandomAccessIterator result_first, RandomAccessIterator result_last, Compare comp);</pre> <h3>Description</h3><tt>Partial_sort_copy</tt> copies the smallest <tt>N</tt> elements from the range<tt>[first, last)</tt> to the range <tt>[result_first, result_first + N)</tt>, where<tt>N</tt> is the smaller of <tt>last - first</tt> and <tt>result_last - result_first</tt>.The elements in <tt>[result_first, result_first + N)</tt> will be in ascendingorder.<P>The two versions of <tt>partial_sort_copy</tt> differ in how they define whether oneelement is less than another. The first version comparesobjects using <tt>operator<</tt>, and the second compares objects usinga <A href="functors.html">function object</A> <tt>comp</tt>.<P>The postcondition for the first version of <tt>partial_sort_copy</tt> is as follows.If <tt>i</tt> and <tt>j</tt> areany two valid iterators in the range <tt>[result_first, result_first +N)</tt> such that <tt>i</tt> precedes <tt>j</tt>, then <tt>*j < *i</tt> will be <tt>false</tt>.The corresponding postcondition for the second version is that<tt>comp(*j, *i)</tt> will be <tt>false</tt>.<P>The return value is <tt>result_first + N</tt>.<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">InputIterator</A>.<LI><tt>RandomAccessIterator</tt> is a model of <A href="RandomAccessIterator.html">Random Access Iterator</A>.<LI><tt>RandomAccessIterator</tt> is mutable.<LI>The value types of <tt>InputIterator</tt> and <tt>RandomAccessIterator</tt> are the same.<LI><tt>RandomAccessIterator</tt>'s value type is <A href="LessThanComparable.html">LessThan Comparable</A>.<LI>The ordering relation on <tt>RandomAccessIterator</tt>'s value type is a <i>strict weak ordering</i>, as defined in the <A href="LessThanComparable.html">LessThan Comparable</A> requirements.</UL>For the second version:<UL><LI><tt>InputIterator</tt> is a model of <A href="InputIterator.html">InputIterator</A>.<LI><tt>RandomAccessIterator</tt> is a model of <A href="RandomAccessIterator.html">Random Access Iterator</A>.<LI><tt>RandomAccessIterator</tt> is mutable.<LI>The value types of <tt>InputIterator</tt> and <tt>RandomAccessIterator</tt> are the same.<LI><tt>StrictWeakOrdering</tt> is a model of <A href="StrictWeakOrdering.html">Strict Weak Ordering</A>.<LI><tt>RandomAccessIterator</tt>'s value type is convertible to <tt>StrictWeakOrdering</tt>'s argument type.</UL><h3>Preconditions</h3><UL><LI><tt>[first, last)</tt> is a valid range.<LI><tt>[result_first, result_last)</tt> is a valid range.<LI><tt>[first, last)</tt> and <tt>[result_first, result_last)</tt> do not overlap.</UL><h3>Complexity</h3>Approximately <tt>(last - first) * log(N)</tt> comparisons, where <tt>N</tt> is thesmaller of <tt>last - first</tt> and <tt>result_last - result_first</tt>.<h3>Example</h3><pre>int A[] = {7, 2, 6, 11, 9, 3, 12, 10, 8, 4, 1, 5};const int N = sizeof(A) / sizeof(int);vector<int> V(4);partial_sort_copy(A, A + N, V.begin(), V.end());copy(V.begin(), V.end(), ostream_iterator<int>(cout, " "));// The printed result is "1 2 3 4".</pre><h3>Notes</h3><h3>See also</h3><tt><A href="partial_sort.html">partial_sort</A></tt>,<tt><A href="sort.html">sort</A></tt>,<tt><A href="stable_sort.html">stable_sort</A></tt>,<tt><A href="binary_search.html">binary_search</A></tt>,<tt><A href="lower_bound.html">lower_bound</A></tt>,<tt><A href="upper_bound.html">upper_bound</A></tt>,<tt><A href="less.html">less</A><T></tt>,<A href="StrictWeakOrdering.html">StrictWeakOrdering</A>,<A href="LessThanComparable.html">LessThan Comparable</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> ?? 快捷鍵說明
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