gomp-20050608-branch/libstdc++-v3/testsuite/ext/pb_assoc/example/tree_split.cc

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005 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
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 2, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  19 // USA.
  20
  21 // As a special exception, you may use this file as part of a free software
  22 // library without restriction.  Specifically, if other files instantiate
  23 // templates or use macros or inline functions from this file, or you compile
  24 // this file and link it with other files to produce an executable, this
  25 // file does not by itself cause the resulting executable to be covered by
  26 // the GNU General Public License.  This exception does not however
  27 // invalidate any other reasons why the executable file might be covered by
  28 // the GNU General Public License.
  29
  30 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
  31
  32 // Permission to use, copy, modify, sell, and distribute this software
  33 // is hereby granted without fee, provided that the above copyright
  34 // notice appears in all copies, and that both that copyright notice and
  35 // this permission notice appear in supporting documentation. None of
  36 // the above authors, nor IBM Haifa Research Laboratories, make any
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  39
  40 /**
  41  * @file tree_split_example.cpp
  42  * A basic example showing how to split tree-based container objects.
  43  */
  44
  45 // For rb_tree_assoc_cntnr.
  46 #include <ext/pb_assoc/assoc_cntnr.hpp>
  47 // For assert
  48 #include <cassert>
  49
  50 int
  51 main()
  52 {
  53   /*
  54    * A red-black tree table mapping ints to chars.
  55    */
  56   typedef pb_assoc::tree_assoc_cntnr< int, char> map_t;
  57
  58   // A map_t object.
  59   map_t r;
  60
  61   // Inserts some entries into r.
  62
  63   for (int i = 0; i < 100; ++ i)
  64     r.insert(std::make_pair(i, 'a'));
  65
  66   // Now split r into a different map_t object.
  67
  68   // larger_r will hold the larger values following the split.
  69   map_t larger_r;
  70
  71   // Split all elements larger than 1000 into larger_r. This is exception free.
  72   r.split(1000, larger_r);
  73
  74   /*
  75    * Since there were no elements larger than 1000, r
  76    *    should be unchanged.
  77    **/
  78
  79   assert(r.size() == 100);
  80   assert(r.begin()->first == 0);
  81
  82   // Now perform a split which actually changes the content of r.
  83
  84   // Split all elements larger than 3 into larger_r.
  85   r.split(3, larger_r);
  86
  87   assert(r.size() == 4);
  88   assert(larger_r.begin()->first == 4);
  89 }
  90