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

   1 // Copyright (C) 2001, 2004, 2005, 2009 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 3, 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 COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // 25.?? algorithms, rotate()
  19
  20 #include <algorithm>
  21 #include <testsuite_hooks.h>
  22 #include <list>
  23
  24 bool test __attribute__((unused)) = true;
  25
  26 int A[] = {1, 2, 3, 4, 5, 6, 7};
  27 int B[] = {2, 3, 4, 5, 6, 7, 1};
  28 int C[] = {1, 2, 3, 4, 5, 6, 7};
  29 int D[] = {5, 6, 7, 1, 2, 3, 4};
  30 const int N = sizeof(A) / sizeof(int);
  31
  32 /* need a test for a forward iterator -- can't think of one that makes sense */
  33
  34 /* biderectional iterator */
  35 void
  36 test02()
  37 {
  38     using std::rotate;
  39     typedef std::list<int> Container;
  40
  41     Container a(A, A + N);
  42     VERIFY(std::equal(a.begin(), a.end(), A));
  43
  44     Container::iterator i = a.begin();
  45     rotate(a.begin(), ++i, a.end());
  46     VERIFY(std::equal(a.begin(), a.end(), B));
  47
  48     i = a.end();
  49     rotate(a.begin(), --i, a.end());
  50     VERIFY(std::equal(a.begin(), a.end(), C));
  51
  52     i = a.begin();
  53     std::advance(i, 3);
  54     rotate(a.begin(), ++i, a.end());
  55     VERIFY(std::equal(a.begin(), a.end(), D));
  56 }
  57
  58 /* random iterator */
  59 void
  60 test03()
  61 {
  62     using std::rotate;
  63     rotate(A, A + 1, A + N);
  64     VERIFY(std::equal(A, A + N, B));
  65
  66     rotate(A, A + N - 1, A + N);
  67     VERIFY(std::equal(A, A + N, C));
  68
  69     rotate(A, A + 4, A + N);
  70     VERIFY(std::equal(A, A + N, D));
  71 }
  72
  73 int
  74 main()
  75 {
  76   test02();
  77   test03();
  78   return 0;
  79 }