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// Copyright (C) 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.

// 25.3.2 [lib.alg.nth.element]

#include <algorithm>

#include <testsuite_hooks.h>

#include <testsuite_iterators.h>

using __gnu_test::test_container;

using __gnu_test::random_access_iterator_wrapper;

using std::nth_element;

typedef test_container<int, random_access_iterator_wrapper> Container;

void

test1()

{

  int array[]={0};

  Container con(array, array);

  partial_sort(con.begin(), con.begin(), con.end());

}

void

test2()

{

  int array[]={2,1,0};

  Container con(array, array + 2);

  partial_sort(con.begin(), con.begin(), con.end());

  partial_sort(con.begin(), con.end(), con.end());

}

void

test3()

{

  int array[] = {6, 5, 4, 3, 2, 1, 0};

  Container con(array, array + 7);

  nth_element(con.begin(), con.it(3), con.end());

  for(int i = 0; i < 3; ++i)

    VERIFY(array[i] < array[3]);

  for(int i = 4; i < 7; ++i)

    VERIFY(array[3] < array[i]);

}

void

test4()

{

  int array[] = {0, 6, 1, 5, 2, 4, 3};

  Container con(array,array + 7);

  nth_element(con.begin(), con.it(3), con.end());

  for(int i = 0; i < 3; ++i)

    VERIFY(array[i] < array[3]);

  for(int i = 4; i < 7; ++i)

    VERIFY(array[3] < array[i]);

}

int

main()

{

  test1();

  test2();

  test3();

  test4();

}