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// Copyright (C) 2001, 2004, 2005, 2009 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
 
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
 
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3.  If not see
// <http://www.gnu.org/licenses/>.
 
// 25.?? algorithms, rotate()
 
#include <algorithm>
#include <testsuite_hooks.h>
#include <list>
 
bool test __attribute__((unused)) = true;
 
int A[] = {1, 2, 3, 4, 5, 6, 7};
int B[] = {2, 3, 4, 5, 6, 7, 1};
int C[] = {1, 2, 3, 4, 5, 6, 7};
int D[] = {5, 6, 7, 1, 2, 3, 4};
const int N = sizeof(A) / sizeof(int);
 
/* need a test for a forward iterator -- can't think of one that makes sense */
 
/* biderectional iterator */
void
test02()
{
    using std::rotate;
    typedef std::list<int> Container;
 
    Container a(A, A + N);
    VERIFY(std::equal(a.begin(), a.end(), A));
 
    Container::iterator i = a.begin();
    rotate(a.begin(), ++i, a.end());
    VERIFY(std::equal(a.begin(), a.end(), B));
 
    i = a.end();
    rotate(a.begin(), --i, a.end());
    VERIFY(std::equal(a.begin(), a.end(), C));
 
    i = a.begin();
    std::advance(i, 3);
    rotate(a.begin(), ++i, a.end());
    VERIFY(std::equal(a.begin(), a.end(), D));
}
 
/* random iterator */
void
test03()
{
    using std::rotate;
    rotate(A, A + 1, A + N);
    VERIFY(std::equal(A, A + N, B));
 
    rotate(A, A + N - 1, A + N);
    VERIFY(std::equal(A, A + N, C));
 
    rotate(A, A + 4, A + N);
    VERIFY(std::equal(A, A + N, D));
}
 
int
main()
{
  test02();
  test03();
  return 0;
}