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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the test suite of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtTest/QtTest>
#include <QtCore/QScopedValueRollback>
/*!
\class tst_QScopedValueRollback
\internal
\since 4.8
\brief Tests class QScopedValueRollback.
*/
class tst_QScopedValueRollback : public QObject
{
Q_OBJECT
private Q_SLOTS:
void leavingScope();
void leavingScopeAfterCommit();
void rollbackToPreviousCommit();
void exceptions();
void earlyExitScope();
private:
void earlyExitScope_helper(int exitpoint, int &member);
};
void tst_QScopedValueRollback::leavingScope()
{
int i = 0;
bool b = false;
QString s("This is useful");
//test rollback on going out of scope
{
QScopedValueRollback<int> ri(i);
QScopedValueRollback<bool> rb(b);
QScopedValueRollback<QString> rs(s);
QCOMPARE(b, false);
QCOMPARE(i, 0);
QCOMPARE(s, QString("This is useful"));
b = true;
i = 1;
s = "Useless";
QCOMPARE(b, true);
QCOMPARE(i, 1);
QCOMPARE(s, QString("Useless"));
}
QCOMPARE(b, false);
QCOMPARE(i, 0);
QCOMPARE(s, QString("This is useful"));
}
void tst_QScopedValueRollback::leavingScopeAfterCommit()
{
int i = 0;
bool b = false;
QString s("This is useful");
//test rollback on going out of scope
{
QScopedValueRollback<int> ri(i);
QScopedValueRollback<bool> rb(b);
QScopedValueRollback<QString> rs(s);
QCOMPARE(b, false);
QCOMPARE(i, 0);
QCOMPARE(s, QString("This is useful"));
b = true;
i = 1;
s = "Useless";
QCOMPARE(b, true);
QCOMPARE(i, 1);
QCOMPARE(s, QString("Useless"));
ri.commit();
rb.commit();
rs.commit();
}
QCOMPARE(b, true);
QCOMPARE(i, 1);
QCOMPARE(s, QString("Useless"));
}
void tst_QScopedValueRollback::rollbackToPreviousCommit()
{
int i=0;
{
QScopedValueRollback<int> ri(i);
i++;
ri.commit();
i++;
}
QCOMPARE(i,1);
{
QScopedValueRollback<int> ri1(i);
i++;
ri1.commit();
i++;
ri1.commit();
i++;
}
QCOMPARE(i,3);
}
void tst_QScopedValueRollback::exceptions()
{
bool b = false;
bool caught = false;
QT_TRY
{
QScopedValueRollback<bool> rb(b);
b = true;
QT_THROW(std::bad_alloc()); //if Qt compiled without exceptions this is noop
rb.commit(); //if Qt compiled without exceptions, true is committed
}
QT_CATCH(...)
{
caught = true;
}
QCOMPARE(b, !caught); //expect false if exception was thrown, true otherwise
}
void tst_QScopedValueRollback::earlyExitScope()
{
int i=0;
int j=0;
while (true) {
QScopedValueRollback<int> ri(i);
i++;
j=i;
if (i>8) break;
ri.commit();
}
QCOMPARE(i,8);
QCOMPARE(j,9);
for (i = 0; i < 5; i++) {
j=1;
earlyExitScope_helper(i,j);
QCOMPARE(j, 1<<i);
}
}
void tst_QScopedValueRollback::earlyExitScope_helper(int exitpoint, int& member)
{
QScopedValueRollback<int> r(member);
member *= 2;
if (exitpoint == 0)
return;
r.commit();
member *= 2;
if (exitpoint == 1)
return;
r.commit();
member *= 2;
if (exitpoint == 2)
return;
r.commit();
member *= 2;
if (exitpoint == 3)
return;
r.commit();
}
QTEST_MAIN(tst_QScopedValueRollback)
#include "tst_qscopedvaluerollback.moc"
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