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// -*- c++ -*-
//------------------------------------------------------------------------
// $Id: autoptr_test.cpp,v 1.4 2005/03/19 17:19:24 vlg Exp $
//------------------------------------------------------------------------
// src/test/autoptr.C
//------------------------------------------------------------------------------
// Copyright (c) 1999,2001,2005 by Vladislav Grinchenko
//
// This program 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
// 2 of the License, or (at your option) any later version.
//------------------------------------------------------------------------
//
// Description:
//
// This module tests and illustrates auto_ptr usage defined in
// assa/AutoPtr.h file
//
// Date: March 15, 1999
//------------------------------------------------------------------------
#include <iostream>
#include <assert.h>
#include "assa/AutoPtr.h"
using namespace std;
using namespace ASSA;
/** -------------------------------------------------------------------------
* Parent
** -------------------------------------------------------------------------
*/
class VParent
{
private:
static int m_cnt;
public:
VParent() {
cout << "-- VParent::VParent --\n";
m_cnt++;
}
~VParent() {
cout << "-- VParent::~VParent --\n";
m_cnt--;
}
VParent (const VParent& /* m_ */) {
cout << "-- VParent::VParent(const VParent&) --\n";
m_cnt++;
}
VParent& operator= (const VParent& /* m_ */) {
cout << "-- VParent::operator= --\n";
m_cnt++;
return *this;
}
static int getCount() { return m_cnt; }
static void resetCount() { m_cnt = 0; }
void printMsg() { cout << "I'm a VParent class!\n"; }
};
int VParent::m_cnt = 0;
/** -------------------------------------------------------------------------
* Child
** -------------------------------------------------------------------------
*/
class VChild : public VParent {};
void leak_mem ()
{
cout << "-- leak_mem --\n";
VParent* a = new VParent();
a->printMsg();
}
void no_leak_mem ()
{
cout << "-- no_leak_mem --\n";
AutoPtr<VParent> a (new VParent);
a->printMsg();
}
/** -------------------------------------------------------------------------
* Function
** -------------------------------------------------------------------------
*/
AutoPtr<VParent> foo ()
{
AutoPtr<VParent> vptr (new VParent);
return vptr;
}
/** --------------------------------------------------------------------------
* Main
** --------------------------------------------------------------------------
*/
int main()
{
cout << "\n*** Testing memory allocation/deallocation ***\n";
cout << "\nCalling leak_mem()\n";
leak_mem();
cout << "copies on heap still allocated: " << VParent::getCount();
assert (VParent::getCount() == 1);
cout << " ... ok\n";
VParent::resetCount ();
cout << "\nCalling no_leak_mem()\n";
no_leak_mem();
cout << "copies on heap still allocated: " << VParent::getCount();
assert (VParent::getCount() == 0);
cout << " ... ok\n";
// How about rebinding later in the game?
{
AutoPtr<VParent> fp;
bool cond = true;
if (cond) {
AutoPtr<VParent> temp (new VParent);
fp = temp;
}
}
//---------------------------------------------------------------
// A function can behave as a source of data. When an AutoPtr
// is returned, ownership of the returned value gets transferred
// to the calling function.
cout << "\n*** Testing ownership transfer by function ***\n\n";
VParent::resetCount ();
{
AutoPtr<VParent> vp;
for (int i = 0; i < 3; i++) {
vp = foo ();
}
}
//---------------------------------------------------------------
cout << "\n*** Testing ownership transfer ***\n\n";
{
AutoPtr<VParent> p1 (new VParent());
AutoPtr<VParent> p2;
cout << "\nUninitialized AutoPtr is a '0' pointer ...";
assert (p2.get() == 0);
cout << " ok\n";
cout << "Ownership transfer by assignment ... ";
p2 = p1;
assert (p2.get() != 0);
cout << "ok\n";
cout << "Ownership transfer by copy constructor ... ";
AutoPtr<VParent> p3(p2);
assert (p3.get() != 0);
cout << "ok\n";
}
cout << "\n*** Testing inheritance handling ***\n\n";
{
AutoPtr<VParent> pp (new VChild);
AutoPtr<VChild> pc (new VChild);
pp = pc;
AutoPtr<VParent> pp2 (pc);
}
cout << "ok\n";
// --------------------------------------------------------------
cout << "\n*** Testing AutoPtrArray handling ***\n\n";
{
AutoPtrArray<VParent> vp1 (new VParent[6]);
}
cout << "ok\n";
cout << "\nTest done!\n\n";
}
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