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/***************************************************************************
* tests/containers/test_migr_stack.cpp
*
* Part of the STXXL. See http://stxxl.sourceforge.net
*
* Copyright (C) 2003 Roman Dementiev <dementiev@mpi-sb.mpg.de>
*
* 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)
**************************************************************************/
//! \example containers/test_migr_stack.cpp
//! This is an example of how to use \c stxxl::STACK_GENERATOR class
//! to generate an \b migrating stack with critical size \c critical_size ,
//! external implementation \c normal_stack , \b four blocks per page,
//! block size \b 4096 bytes, and internal implementation
//! \c std::stack<int>
#include <stxxl/stack>
// forced instantiation
const unsigned critical_size = 8 * 4096;
template class stxxl::STACK_GENERATOR<size_t, stxxl::migrating, stxxl::normal, 4, 4096, std::stack<size_t>, critical_size>;
int main()
{
typedef stxxl::STACK_GENERATOR<size_t, stxxl::migrating, stxxl::normal, 4, 4096, std::stack<size_t>, critical_size>::result migrating_stack_type;
STXXL_MSG("Starting test.");
migrating_stack_type my_stack;
size_t test_size = 1 * 1024 * 1024 / sizeof(int);
STXXL_MSG("Filling stack.");
for (size_t i = 0; i < test_size; i++)
{
my_stack.push(i);
STXXL_CHECK(my_stack.top() == i);
STXXL_CHECK(my_stack.size() == i + 1);
STXXL_CHECK((my_stack.size() >= critical_size) == my_stack.external());
}
STXXL_MSG("Testing swap.");
// test swap
migrating_stack_type my_stack2;
std::swap(my_stack2, my_stack);
std::swap(my_stack2, my_stack);
STXXL_MSG("Removing elements from " <<
(my_stack.external() ? "external" : "internal") << " stack");
for (size_t i = test_size; i > 0; )
{
--i;
STXXL_CHECK(my_stack.top() == i);
STXXL_CHECK(my_stack.size() == i + 1);
my_stack.pop();
STXXL_CHECK(my_stack.size() == i);
STXXL_CHECK(my_stack.external() == (test_size >= int(critical_size)));
}
STXXL_MSG("Test passed.");
return 0;
}
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