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

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+/**************************************************************************
+ *
+ * p_queue.cpp - Example program of a priority queue.
+ *
+ * $Id: priority_queue.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 <deque>      // for deque
+#include <iostream>   // for cout, endl
+#include <queue>      // for priority_queue
+#include <string>     // for string
+#include <vector>     // for vector
+
+#include <examples.h>
+
+
+int main ()
+{
+    // Make a priority queue of int  using a vector container.
+    std::priority_queue<int,
+                        std::vector<int, std::allocator<int> >,
+                        std::less<int> > pq;
+    // Push a couple of values.
+    pq.push (1);
+    pq.push (2);
+
+    // Pop a couple of values and examine the ends.
+    std::cout << pq.top () << std::endl;
+    pq.pop ();
+    std::cout << pq.top () << std::endl;
+    pq.pop ();
+
+    // Make a priority queue of strings.
+    std::priority_queue<std::string,
+                        std::deque<std::string, std::allocator<std::string> >,
+                        std::less<std::string> > pqs;
+
+    // Push on a few strings then pop them back off.
+    for (int i = 0; i < 10; i++) {
+        pqs.push (std::string (i + 1, 'a'));
+        std::cout << pqs.top () << std::endl;
+    }
+
+    for (int j = 0; j < 10; j++) {
+        std::cout << pqs.top () << std::endl;
+        pqs.pop ();
+    }
+
+    // Make a priority queue of strings using greater.
+    std::priority_queue<std::string,
+                        std::deque<std::string,
+                                   std::allocator<std::string> >, 
+                        std::greater<std::string> > pgqs;
+
+    // Push on a few strings then pop them back off.
+    for (int k = 0; k < 10; k++)  {
+        pgqs.push (std::string (k + 1, 'a'));
+        std::cout << pgqs.top () << std::endl;
+    }
+
+    for (int m = 0; m < 10; m++) {
+        std::cout << pgqs.top () << std::endl;
+        pgqs.pop ();
+    }
+
+    return 0;
+}