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// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 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 Pred 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/>.

// 25.3.6 Heap operations [lib.alg.heap.operations]

#include <algorithm>

#include <testsuite_hooks.h>

const int A[] = {1, 11, 12, 3, 10, 6, 17, 4, 8, 2, 5, 13, 9, 15, 14, 16, 7};

const int B[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17};

const int C[] = {17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1};

const int N = sizeof(A) / sizeof(int);

// This functor has the equivalent functionality of std::greater<>,

// but there is no dependency on <functional> and it also tracks the

// number of invocations since creation.

class Gt

{

public:

  static int count() { return _M_count; }

  static void reset() { _M_count = 0; }

  bool

  operator()(const int& x, const int& y)

  {

    ++_M_count;

    return x > y;

  }

private:

  static int _M_count;

};

int Gt::_M_count = 0;

// Exercise all of the heap functions for operator<.  The intermediate

// results between push_heap and pop_heap and make_heap and sort_heap

// are not checked (they could be).

void

test01()

{

  bool test __attribute__((unused)) = true;

  // sort array s1 using push_heap/pop_heap

  int s1[N];

  std::copy(A, A + N, s1);

  VERIFY(std::equal(s1, s1 + N, A));

  for (int i = 2; i <= N; ++i)

    std::push_heap(s1, s1 + i);

  for (int i = N; i >= 2; --i)

    std::pop_heap(s1, s1 + i);

  VERIFY(std::equal(s1, s1 + N, B));

  // sort array s2 using make_heap/sort_heap

  int s2[N];

  std::copy(A, A + N, s2);

  VERIFY(std::equal(s2, s2 + N, A));

  std::make_heap(s2, s2 + N);

  std::sort_heap(s2, s2 + N);

  VERIFY(std::equal(s2, s2 + N, B));

}

// Perform same tests as above but with the comparison predicate

// versions, and add complexity constraint checks.

void

test02()

{

  bool test __attribute__((unused)) = true;

  Gt gt;

#ifndef _GLIBCXX_DEBUG

  //const int logN = static_cast<int>(std::log(static_cast<double>(N)) + 0.5);

  const int logN = 3;

#endif

  int s1[N];

  std::copy(A, A + N, s1);

  VERIFY(std::equal(s1, s1 + N, A));

  for (int i = 2; i <= N; ++i)

    {

      std::push_heap(s1, s1 + i, gt);

#ifndef _GLIBCXX_DEBUG

      VERIFY(gt.count() <= logN);

#endif

      gt.reset();

    }

  for (int i = N; i >= 2; --i)

    {

      std::pop_heap(s1, s1 + i, gt);

#ifndef _GLIBCXX_DEBUG

      VERIFY(gt.count() <= 2 * logN);

#endif

      gt.reset();

    }

  VERIFY(std::equal(s1, s1 + N, C));

  // sort array s2 using make_heap/sort_heap

  int s2[N];

  std::copy(A, A + N, s2);

  VERIFY(std::equal(s2, s2 + N, A));

  std::make_heap(s2, s2 + N, gt);

#ifndef _GLIBCXX_DEBUG

  VERIFY(gt.count() <= 3 * N);

#endif

  gt.reset();

  std::sort_heap(s2, s2 + N, gt);

#ifndef _GLIBCXX_DEBUG

  VERIFY(gt.count() <= N * logN);

#endif

  VERIFY(std::equal(s2, s2 + N, C));

}

int

main()

{

  test01();

  test02();

  return 0;

}