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// Copyright (C) 2001, 2004, 2005 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 2, 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 COPYING.  If not, write to the Free

// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,

// USA.

// 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;

}