examples/containers/stack2.cpp

This example code is explained in the STXXL Stack section

/***************************************************************************
 *  examples/containers/stack2.cpp
 *
 *  Part of the STXXL. See http://stxxl.sourceforge.net
 *
 *  Copyright (C) 2013 Daniel Feist <[email protected]>
 *
 *  Distributed under the Boost Software License, Version 1.0.
 *  (See accompanying file LICENSE_1_0.txt or copy at
 *  http://www.boost.org/LICENSE_1_0.txt)
 **************************************************************************/

#include <stack>
#include <stxxl/stack>

int main()
{
    // template parameter <data_type, externality, behaviour, blocks_per_page, block_size, internal_stack_type, migrating_critical_size, allocation_strategy, size_type>
    typedef stxxl::STACK_GENERATOR<int, stxxl::external, stxxl::grow_shrink, 4, 2*1024*1024>::result simple_stack;

    // create stack instance
    simple_stack a_stack;

    stxxl::random_number<> random;
    stxxl::uint64 number_of_elements = 16 * 1024 * 1024;

    // routine: 1) push random values on stack and 2) pop all except the lowest value and start again
    for (int k = 0; k < 5; k++) {
        STXXL_MSG("push...");
        for (stxxl::uint64 i = 0; i < number_of_elements; i++)
        {
            a_stack.push(random(123456789));
        }

        STXXL_MSG("pop...");
        for (stxxl::uint64 j = 0; j < number_of_elements - 1; j++)
        {
            a_stack.pop();
        }
    }

    return 0;
}