libstdc++-v3/testsuite/25_algorithms/rotate.cc

   1 // Copyright (C) 2001, 2004, 2005 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 2, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING.  If not, write to the Free
  16 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  17 // USA.
  18
  19 // 25.?? algorithms, rotate()
  20
  21 #include <algorithm>
  22 #include <testsuite_hooks.h>
  23 #include <list>
  24
  25 bool test __attribute__((unused)) = true;
  26
  27 int A[] = {1, 2, 3, 4, 5, 6, 7};
  28 int B[] = {2, 3, 4, 5, 6, 7, 1};
  29 int C[] = {1, 2, 3, 4, 5, 6, 7};
  30 int D[] = {5, 6, 7, 1, 2, 3, 4};
  31 const int N = sizeof(A) / sizeof(int);
  32
  33 /* need a test for a forward iterator -- can't think of one that makes sense */
  34
  35 /* biderectional iterator */
  36 void
  37 test02()
  38 {
  39     using std::rotate;
  40     typedef std::list<int> Container;
  41
  42     Container a(A, A + N);
  43     VERIFY(std::equal(a.begin(), a.end(), A));
  44
  45     Container::iterator i = a.begin();
  46     rotate(a.begin(), ++i, a.end());
  47     VERIFY(std::equal(a.begin(), a.end(), B));
  48
  49     i = a.end();
  50     rotate(a.begin(), --i, a.end());
  51     VERIFY(std::equal(a.begin(), a.end(), C));
  52
  53     i = a.begin();
  54     std::advance(i, 3);
  55     rotate(a.begin(), ++i, a.end());
  56     VERIFY(std::equal(a.begin(), a.end(), D));
  57 }
  58
  59 /* random iterator */
  60 void
  61 test03()
  62 {
  63     using std::rotate;
  64     rotate(A, A + 1, A + N);
  65     VERIFY(std::equal(A, A + N, B));
  66
  67     rotate(A, A + N - 1, A + N);
  68     VERIFY(std::equal(A, A + N, C));
  69
  70     rotate(A, A + 4, A + N);
  71     VERIFY(std::equal(A, A + N, D));
  72 }
  73
  74 int
  75 main()
  76 {
  77   test02();
  78   test03();
  79   return 0;
  80 }