libstdc++-v3/testsuite/ext/pb_ds/regression/priority_queues.cc

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005-2017 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the terms
   7 // of the GNU General Public License as published by the Free Software
   8 // Foundation; either version 3, or (at your option) any later
   9 // version.
  10
  11 // This library is distributed in the hope that it will be useful, but
  12 // WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 // General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License
  17 // along with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20
  21 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
  22
  23 // Permission to use, copy, modify, sell, and distribute this software
  24 // is hereby granted without fee, provided that the above copyright
  25 // notice appears in all copies, and that both that copyright notice
  26 // and this permission notice appear in supporting documentation. None
  27 // of the above authors, nor IBM Haifa Research Laboratories, make any
  28 // representation about the suitability of this software for any
  29 // purpose. It is provided "as is" without express or implied
  30 // warranty.
  31
  32 /**
  33  * This example shows how to use priority queues. It defines a
  34  *    function performing a sequence of operations on
  35  *    a generic container. It then calls this function with some containers.
  36  */
  37
  38 #include <ext/pb_ds/priority_queue.hpp>
  39 #include <iostream>
  40 #include <cassert>
  41
  42 using namespace std;
  43 using namespace __gnu_pbds;
  44 using namespace __gnu_pbds;
  45
  46 template<typename Cntnr>
  47 void
  48 some_op_sequence(Cntnr& r_c)
  49 {
  50   assert(r_c.empty());
  51   assert(r_c.size() == 0);
  52
  53   for (size_t i = 0; i < 10; ++i)
  54     r_c.push(i);
  55
  56   cout << endl << "All values in the container:" << endl;
  57   for (typename Cntnr::const_iterator it = r_c.begin(); it != r_c.end();
  58        ++it)
  59     cout <<* it << endl;
  60
  61   assert(!r_c.empty());
  62   assert(r_c.size() == 10);
  63
  64   cout << "Popping all values: " << endl;
  65
  66   while (!r_c.empty())
  67     {
  68       cout << r_c.top() << endl;
  69
  70       r_c.pop();
  71     }
  72
  73   assert(r_c.empty());
  74   assert(r_c.size() == 0);
  75
  76   cout << endl;
  77 }
  78
  79 void
  80 priority_queue_link_regression_test_0()
  81 {
  82   {
  83     /*
  84      *  Perform operations on a pairing-heap queue.
  85      */
  86     cout << "Pairing heap" << endl;
  87     __gnu_pbds::priority_queue<int, less<int>, pairing_heap_tag> c;
  88     some_op_sequence(c);
  89   }
  90
  91   {
  92     /*
  93      *  Perform operations on a binomial-heap queue.
  94      */
  95     cout << "Binomial heap" << endl;
  96     __gnu_pbds::priority_queue<int, less<int>, binomial_heap_tag> c;
  97     some_op_sequence(c);
  98   }
  99
 100   {
 101     /*
 102      *  Perform operations on a binomial-heap queue.
 103      */
 104     cout << "Redundant-counter binomial heap" << endl;
 105     __gnu_pbds::priority_queue<int, less<int>, rc_binomial_heap_tag> c;
 106     some_op_sequence(c);
 107   }
 108
 109   {
 110     /*
 111      *  Perform operations on a binary-heap queue.
 112      */
 113     cout << "Binary heap" << endl;
 114     __gnu_pbds::priority_queue<int, less<int>, binary_heap_tag> c;
 115     some_op_sequence(c);
 116   }
 117
 118   {
 119     /*
 120      *  Perform operations on a thin-heap queue.
 121      */
 122     cout << "Thin heap" << endl;
 123     __gnu_pbds::priority_queue<int, less<int>, thin_heap_tag> c;
 124     some_op_sequence(c);
 125   }
 126 }
 127
 128
 129 void
 130 priority_queue_link_regression_test_1()
 131 {
 132   {
 133     /*
 134      *  Perform operations on a pairing-heap queue.
 135      */
 136     cout << "Pairing heap" << endl;
 137     __gnu_pbds::priority_queue<int, less<int>, pairing_heap_tag> c;
 138     some_op_sequence(c);
 139   }
 140
 141   {
 142     /*
 143      *  Perform operations on a binomial-heap queue.
 144      */
 145     cout << "Binomial heap" << endl;
 146     __gnu_pbds::priority_queue<int, less<int>, binomial_heap_tag> c;
 147     some_op_sequence(c);
 148   }
 149
 150   {
 151     /*
 152      *  Perform operations on a binomial-heap queue.
 153      */
 154     cout << "Redundant-counter binomial heap" << endl;
 155     __gnu_pbds::priority_queue<int, less<int>, rc_binomial_heap_tag> c;
 156     some_op_sequence(c);
 157   }
 158
 159   {
 160     /*
 161      *  Perform operations on a binomial-heap queue.
 162      */
 163     cout << "Binary heap" << endl;
 164     __gnu_pbds::priority_queue<int, less<int>, binary_heap_tag> c;
 165     some_op_sequence(c);
 166   }
 167
 168   {
 169     /*
 170      *  Perform operations on a thin-heap queue.
 171      */
 172     cout << "Thin heap" << endl;
 173     __gnu_pbds::priority_queue<int, less<int>, thin_heap_tag> c;
 174     some_op_sequence(c);
 175   }
 176 }
 177
 178 int
 179 main()
 180 {
 181   priority_queue_link_regression_test_0();
 182   priority_queue_link_regression_test_1();
 183   return 0;
 184 }