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

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+/**************************************************************************
+ *
+ * setex.cpp - Example program of sets.
+ *
+ * $Id: setex.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 <functional>   // for less
+#include <set>          // for set
+#include <iostream>     // for cout, endl, ostream_iterator
+#include <iterator>     // for ostream_iterator
+#include <sstream>      // for ostringstream
+
+#include <examples.h>
+
+
+typedef std::set<double, std::less<double>, std::allocator<double> > Set;
+
+
+std::ostream& operator<< (std::ostream& out, const Set &s)
+{
+    std::ostringstream strm;
+
+    typedef std::ostream_iterator<double, char, std::char_traits<char> > Iter;
+
+    std::copy (s.begin (), s.end (), Iter (std::cout, " "));
+
+    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 set and insert 10 element into it.
+    Set sd;
+
+    for (Set::value_type i = 0; i < 10; ++i)
+        sd.insert (i);
+
+    // Print out the set.
+    std::cout << sd << "\n\n";
+
+    // Erase half of the elements in the set.
+    Set::iterator sdi = sd.begin();
+    std::advance (sdi, sd.size () / 2);
+    sd.erase (sd.begin(), sdi);
+
+    // Print it out again.
+    std::cout << sd << "\n\n";
+
+    // Make another set and an empty result set.
+    Set sd2, sdResult;
+
+    for (Set::value_type j = 1; j < 9; ++j)
+        sd2.insert (j + 5);
+
+    std::cout << sd2 << std::endl;
+
+    // Try a couple of set algorithms.
+    std::set_union (sd.begin (),sd.end (),sd2.begin (), sd2.end (),
+                    std::inserter (sdResult, sdResult.begin ()));
+
+    std::cout << "Union:\n" << sdResult << '\n';
+
+    sdResult.erase (sdResult.begin (),sdResult.end ());
+
+    std::set_intersection (sd.begin (), sd.end (), sd2.begin (), sd2.end (),
+                     std::inserter (sdResult, sdResult.begin ()));
+
+    std::cout << "Intersection:\n" << sdResult << '\n';
+  
+    return 0;
+}