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// Copyright (C) 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/>.

/*

 * The goal with this application is to compare the performance

 * between different std::allocator implementations. The results are

 * influenced by the underlying allocator in the "C" library, malloc.

 */

#include <set>

#include <sstream>

using namespace std;

typedef int test_type;

// This can take extremely long on simulators, timing out the test.

// { dg-options "-DITERATIONS=10" { target simulator } }

#ifndef ITERATIONS

#define ITERATIONS 10000

#endif

// The number of iterations to be performed.

int iterations = ITERATIONS;

// The number of values to insert in the container, 32 will cause 5

// (re)allocations to be performed (sizes 4, 8, 16, 32 and 64)

// This means that all allocations are within _MAX_BYTES = 128 as

// defined in stl_alloc.h for __pool_alloc.  Whether or not this

// value is relevant in "the real world" or not I don't know and

// should probably be investigated in more detail.

int insert_values = 128;

template<typename TestType>

  struct value_type : public pair<TestType, TestType>

  {

    value_type() : pair<TestType, TestType>(0, 0) { }

    inline value_type operator++() { return ++this->first, *this; }

    inline operator TestType() const { return this->first; }

  };

template<typename Container>

  void

  do_loop()

  {

    Container obj;

    int test_iterations = 0;

    value_type<test_type> test_value;

    while (test_iterations < iterations)

      {

        for (int j = 0; j < insert_values; ++j)

          obj.insert(obj.end(), ++test_value);

        ++test_iterations;

      }

  }

template<typename Container>

  void

  test_container(Container, bool run_threaded = false)

  {

    do_loop<Container>();

    std::ostringstream comment;

    if (run_threaded)

      comment << "4-way threaded iterations: " << iterations*4 << '\t';

    else

      comment << "iterations: " << iterations << '\t';

  }

// http://gcc.gnu.org/ml/libstdc++/2001-05/msg00105.html

// http://gcc.gnu.org/ml/libstdc++/2003-05/msg00231.html

int main(void)

{

  typedef less<test_type> compare_type;

  test_container(set<test_type, compare_type>());

  return 0;

}