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// { dg-options "-std=gnu++0x" }

// Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010

// 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/>.

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

#undef _GLIBCXX_CONCEPT_CHECKS

// XXX FIXME:  parallel-mode should deal correctly with moveable-only types

// per C++0x, at minimum smoothly fall back to serial.

#undef _GLIBCXX_PARALLEL

#include <algorithm>

#include <testsuite_hooks.h>

#include <testsuite_iterators.h>

#include <testsuite_rvalref.h>

using __gnu_test::test_container;

using __gnu_test::random_access_iterator_wrapper;

using std::nth_element;

using __gnu_test::rvalstruct;

typedef test_container<rvalstruct, random_access_iterator_wrapper> Container;

void

test1()

{

  bool test __attribute__((unused)) = true;

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

  rvalstruct array[7];

  std::copy(intarray, intarray + 7, array);

  Container con(array, array + 7);

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

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

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

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

    VERIFY( array[i].val > 3 );

  for(int i = 0; i < 7; ++i)

    VERIFY( array[i].valid );

}

void

test2()

{

  bool test __attribute__((unused)) = true;

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

  rvalstruct array[7];

  std::copy(intarray, intarray + 7, array);

  Container con(array,array + 7);

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

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

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

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

    VERIFY( array[i].val > 3 );

  for(int i = 0; i < 7; ++i)

    VERIFY( array[i].valid );

}

bool

are_less(const rvalstruct& lhs, const rvalstruct& rhs)

{ return lhs < rhs; }

void

test3()

{

  bool test __attribute__((unused)) = true;

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

  rvalstruct array[7];

  std::copy(intarray, intarray + 7, array);

  Container con(array,array + 7);

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

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

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

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

    VERIFY( array[i].val > 3 );

  for(int i = 0; i < 7; ++i)

    VERIFY( array[i].valid );

}

int

main()

{

  test1();

  test2();

  test3();

  return 0;

}