libstdc++-v3/testsuite/ext/pb_ds/example/basic_map.cc

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005-2013 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  * @file basic_map_example.cpp
  34  * A basic example showing how to use maps.
  35  */
  36
  37 /**
  38  * This example shows how to use "maps". It defines a
  39  * function performing a sequence of operations on
  40  * a generic container. It then calls this function with some containers.
  41  */
  42
  43 #include <iostream>
  44 #include <cassert>
  45 #include <ext/pb_ds/assoc_container.hpp>
  46
  47 using namespace std;
  48 using namespace __gnu_pbds;
  49
  50 // The following function performs a sequence of operations on an
  51 // associative container object mapping integers to characters.
  52 template<class Cntnr>
  53 void
  54 some_op_sequence(Cntnr& r_c)
  55 {
  56   assert(r_c.empty());
  57   assert(r_c.size() == 0);
  58
  59   r_c.insert(make_pair(1, 'a'));
  60
  61   r_c[2] = 'b';
  62
  63   assert(!r_c.empty());
  64   assert(r_c.size() == 2);
  65
  66   cout << "Key 1 is mapped to " << r_c[1] << endl;
  67   cout << "Key 2 is mapped to " << r_c[2] << endl;
  68
  69   cout << endl << "All value types in the container:" << endl;
  70
  71   typedef typename Cntnr::const_iterator const_iterator;
  72   for (const_iterator it = r_c.begin(); it != r_c.end(); ++it)
  73     cout << it->first << " -> " << it->second << endl;
  74   cout << endl;
  75
  76   r_c.clear();
  77
  78   assert(r_c.empty());
  79   assert(r_c.size() == 0);
  80 }
  81
  82 int main()
  83 {
  84   {
  85     // Perform operations on a collision-chaining hash map.
  86     cc_hash_table<int, char> c;
  87     some_op_sequence(c);
  88   }
  89
  90   {
  91     // Perform operations on a general-probing hash map.
  92     gp_hash_table<int, char> c;
  93     some_op_sequence(c);
  94   }
  95
  96   {
  97     // Perform operations on a red-black tree map.
  98     tree<int, char> c;
  99     some_op_sequence(c);
 100   }
 101
 102   {
 103     // Perform operations on a splay tree map.
 104     tree<int, char, less<int>, splay_tree_tag> c;
 105     some_op_sequence(c);
 106   }
 107
 108   {
 109     // Perform operations on an ov tree map.
 110     tree<int, char, less<int>, ov_tree_tag> c;
 111     some_op_sequence(c);
 112   }
 113
 114   {
 115     // Perform operations on a list-update map.
 116     list_update<int, char> c;
 117     some_op_sequence(c);
 118   }
 119 }