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extern/stdcxx/4.2.1/examples/manual/multiset.cpp

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+/**************************************************************************
+ *
+ * multiset.cpp - Example program for multiset class.
+ *
+ * $Id: multiset.cpp 550991 2007-06-26 23:58:07Z sebor $
+ *
+ ***************************************************************************
+ *
+ * Licensed to the Apache Software  Foundation (ASF) under one or more
+ * contributor  license agreements.  See  the NOTICE  file distributed
+ * with  this  work  for  additional information  regarding  copyright
+ * ownership.   The ASF  licenses this  file to  you under  the Apache
+ * License, Version  2.0 (the  "License"); you may  not use  this file
+ * except in  compliance with the License.   You may obtain  a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the  License is distributed on an  "AS IS" BASIS,
+ * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY  KIND, either  express or
+ * implied.   See  the License  for  the  specific language  governing
+ * permissions and limitations under the License.
+ *
+ * Copyright 1994-2006 Rogue Wave Software.
+ * 
+ **************************************************************************/
+
+#include <algorithm>   // for set_intersection(), set_union()
+#include <iostream>    // for cout, endl, ostream
+#include <iterator>    // for ostream_iterator
+#include <sstream>     // for ostringstream
+#include <set>         // for set
+
+#include <examples.h>
+
+
+typedef std::multiset<int, std::less<int>, std::allocator<int> > IntSet;
+
+
+std::ostream& operator<< (std::ostream& out, const IntSet& s)
+{
+    std::ostringstream strm;
+
+    typedef std::ostream_iterator<int, char, std::char_traits<char> >
+        OstreamIter;
+
+    std::copy (s.begin (), s.end (), OstreamIter (strm, " "));
+
+    const std::ostream::sentry guard (out);
+
+    if (guard) {
+        const std::string data = strm.str ();
+
+        if (   std::streamsize (data.size ())
+            != out.rdbuf ()->sputn (data.data (), data.size ()))
+            out.setstate (std::ios::badbit);
+    }
+
+    return out;
+}
+
+
+int main ()
+{
+    // Create a multiset of integers.
+    IntSet  si;
+
+    for (IntSet::value_type j = 0; j < 2; j++) {
+        for (IntSet::value_type i = 0; i < 10; ++i)
+            // Insert values with a hint.
+            si.insert (si.begin (), i);
+    }
+
+    // Print out the multiset.
+    std::cout << si << std::endl;
+
+    // Make another multiset and an empty multiset.
+    IntSet si2, result;
+    for (IntSet::value_type i = 0; i < 10; i++)
+        si2.insert (i + 5);
+
+    std::cout << si2 << std::endl;
+
+    // Try a couple of set algorithms.
+    std::set_union (si.begin (), si.end (), si2.begin (), si2.end (),
+                    std::inserter (result, result.begin ()));
+
+    std::cout << "Union:\n" << result << std::endl;
+
+    result.erase (result.begin (), result.end ());
+
+    std::set_intersection (si.begin (), si.end (), si2.begin (), si2.end (),
+                          std::inserter (result, result.begin ()));
+
+    std::cout << "Intersection:\n" << result << std::endl;
+
+    return 0;
+}