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extern/stdcxx/4.2.1/doc/stdlibref/includes.html
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<HTML>
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<HEAD>
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<TITLE>includes()</TITLE>
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<LINK REL=StyleSheet HREF="../rw.css" TYPE="text/css" TITLE="Apache stdcxx Stylesheet"></HEAD>
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<BODY BGCOLOR=#FFFFFF>
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<A HREF="heapoperations.html"><IMG SRC="images/bprev.gif" WIDTH=20 HEIGHT=21 ALT="Previous file" BORDER=O></A><A HREF="noframes.html"><IMG SRC="images/btop.gif" WIDTH=56 HEIGHT=21 ALT="Top of Document" BORDER=O></A><A HREF="booktoc.html"><IMG SRC="images/btoc.gif" WIDTH=56 HEIGHT=21 ALT="Contents" BORDER=O></A><A HREF="tindex.html"><IMG SRC="images/bindex.gif" WIDTH=56 HEIGHT=21 ALT="Index page" BORDER=O></A><A HREF="indirect-array.html"><IMG SRC="images/bnext.gif" WIDTH=25 HEIGHT=21 ALT="Next file" BORDER=O></A><DIV CLASS="DOCUMENTNAME"><B>Apache C++ Standard Library Reference Guide</B></DIV>
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<H2>includes()</H2>
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<P><B>Library:</B> <A HREF="2-9.html">Algorithms</A></P>
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<PRE><HR><B><I>Function</I></B><HR></PRE>
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<UL>
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<LI><A HREF="#sec1">Local Index</A></LI>
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<LI><A HREF="#sec2">Summary</A></LI>
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<LI><A HREF="#sec3">Synopsis</A></LI>
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<LI><A HREF="#sec4">Description</A></LI>
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<LI><A HREF="#sec5">Complexity</A></LI>
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<LI><A HREF="#sec6">Example</A></LI>
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<LI><A HREF="#sec7">See Also</A></LI>
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<LI><A HREF="#sec8">Standards Conformance</A></LI>
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</UL>
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<A NAME="sec1"><H3>Local Index</H3></A>
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No Entries
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<A NAME="sec2"><H3>Summary</H3></A>
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<P>An algorithm that returns true if every element in one sorted sequence is contained in another sorted sequence</P>
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<A NAME="sec3"><H3>Synopsis</H3></A>
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<PRE>#include <algorithm>
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namespace std {
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template <class InputIterator1, class InputIterator2>
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bool includes(InputIterator1 start1, InputIterator1 finish1,
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InputIterator2 start2,
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InputIterator2 finish2);
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template <class InputIterator1, class InputIterator2,
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class Compare>
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bool includes(InputIterator1 start1, InputIterator1 finish1,
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InputIterator2 start2,
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InputIterator2 finish2, Compare comp);
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}
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</PRE>
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<A NAME="sec4"><H3>Description</H3></A>
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<P>The <SAMP>includes()</SAMP> algorithm compares two sorted sequences and returns <SAMP>true</SAMP> if every element in the range <SAMP>[start2, finish2)</SAMP> is contained in the range <SAMP>[start1, finish1)</SAMP>. It returns <SAMP>false</SAMP> otherwise. <SAMP>includes()</SAMP> assumes that the sequences are sorted using <SAMP>operator<()</SAMP>, or using the predicate <SAMP>comp</SAMP>.</P>
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<A NAME="sec5"><H3>Complexity</H3></A>
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<P>At most <SAMP>((finish1 - start1) + (finish2 - start2)) * 2 - 1</SAMP> comparisons are performed.</P>
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<A NAME="sec6"><H3>Example</H3></A>
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<UL><PRE>//
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// includes.cpp
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//
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#include <algorithm> // for includes
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#include <iostream> // for cout, endl
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#include <set> // for set
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int main ()
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{
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// Typedefs for convenience.
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typedef std::set<int, std::less<int>, std::allocator<int> >
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Set;
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typedef std::ostream_iterator<int, char,
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std::char_traits<char> >
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os_iter;
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int a1[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
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int a2[] = { 2, 4, 6, 8, 10, 12 };
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int a3[] = { 3, 5, 7, 8 };
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// Initialize three sets.
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Set all (a1, a1 + sizeof a1 / sizeof *a1);
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Set even (a2, a2 + sizeof a2 / sizeof *a2);
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Set other (a3, a3 + sizeof a3 / sizeof *a3);
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// Demonstrate includes.
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std::cout << "The set: ";
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std::copy (all.begin (), all.end (),
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os_iter (std::cout, " "));
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bool answer = std::includes (all.begin (), all.end (),
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other.begin (), other.end ());
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std::cout << std::endl
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<< (answer ? "INCLUDES " : "DOES NOT INCLUDE ");
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std::copy (other.begin (), other.end (),
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os_iter (std::cout, " "));
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answer = std::includes (all.begin (), all.end (),
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even.begin (), even.end ());
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std::cout << ", and" << std::endl
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<< (answer ? "INCLUDES" : "DOES NOT INCLUDE ");
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std::copy (even.begin (), even.end (),
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os_iter (std::cout, " "));
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std::cout << std::endl << std::endl;
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return 0;
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}
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Program Output:
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The set: 1 2 3 4 5 6 7 8 9 10
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INCLUDES 3 5 7 8 , and
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DOES NOT INCLUDE 2 4 6 8 10 12
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</PRE></UL>
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<UL><PRE></PRE></UL>
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<A NAME="sec7"><H3>See Also</H3></A>
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<P><SAMP><A HREF="set-union.html">set_union()</A></SAMP>, <SAMP><A HREF="set-intersection.html">set_intersection()</A></SAMP>, <SAMP><A HREF="set-difference.html">set_difference()</A></SAMP>, <SAMP><A HREF="set-symmetric-difference.html">set_symmetric_difference()</A></SAMP></P>
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<A NAME="sec8"><H3>Standards Conformance</H3></A>
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<P><I>ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 25.3.5.1</I></P>
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