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/***************************************************************************
* tests/common/test_counting_ptr.cpp
*
* Small test case for reference counting in stxxl::counting_ptr.
*
* Part of the STXXL. See http://stxxl.sourceforge.net
*
* Copyright (C) 2013 Timo Bingmann <tb@panthema.net>
*
* 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 <stxxl/bits/common/counting_ptr.h>
#include <stxxl/bits/verbose.h>
static unsigned int count_deletes = 0;
// derive from counted_object to include reference counter
struct my_int : public stxxl::counted_object
{
int i;
my_int(int _i) : i(_i) { }
// count number of destructor calls
~my_int()
{ ++count_deletes; }
};
typedef stxxl::counting_ptr<my_int> int_ptr;
typedef stxxl::const_counting_ptr<my_int> int_cptr;
int_cptr run_test()
{
// create object and pointer to it
int_ptr i1 = new my_int(42);
STXXL_CHECK(i1->i == 42);
STXXL_CHECK((*i1).i == 42);
STXXL_CHECK(i1.get()->i == 42);
STXXL_CHECK(i1->unique());
// make pointer sharing same object
int_ptr i2 = i1;
STXXL_CHECK(i2->i == 42);
STXXL_CHECK(!i1->unique());
STXXL_CHECK(i1 == i2);
STXXL_CHECK(i1->get_reference_count() == 2);
// make another pointer sharing the same object
int_ptr i3 = i2;
STXXL_CHECK(i3->i == 42);
STXXL_CHECK(i3->get_reference_count() == 3);
// replace object in i3 with new integer
i3 = new my_int(5);
STXXL_CHECK(i1 != i3);
STXXL_CHECK(i1->get_reference_count() == 2);
// create a const pointer
int_cptr i4 = i3;
// quitting the function will release the first object
return i4;
}
int main()
{
{
// run tests and return a reference counted object
int_cptr t1 = run_test();
// check number of objects destructed
STXXL_CHECK(count_deletes == 1);
// quitting the block will release the ptr
}
STXXL_CHECK(count_deletes == 2);
return 0;
}
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