Revision control
Copy as Markdown
// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include <QTest>
#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();
void moveOnly();
private:
void earlyExitScope_helper(int exitpoint, int &member);
};
void tst_QScopedValueRollback::leavingScope()
{
int i = 0;
bool b = false;
bool b2 = false;
QString s("This is useful");
//test rollback on going out of scope
{
QScopedValueRollback<int> ri(i);
QScopedValueRollback<bool> rb(b);
QScopedValueRollback<bool> rb2(b2, true);
QScopedValueRollback<QString> rs(s);
QCOMPARE(b, false);
QCOMPARE(b2, true);
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(b2, 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();
}
void tst_QScopedValueRollback::moveOnly()
{
std::unique_ptr<int> uniquePtr;
std::unique_ptr<int> newVal(new int(5));
QVERIFY(!uniquePtr);
{
QScopedValueRollback<std::unique_ptr<int>> r(uniquePtr, std::move(newVal));
QVERIFY(uniquePtr);
}
QVERIFY(!uniquePtr);
}
QTEST_MAIN(tst_QScopedValueRollback)
#include "tst_qscopedvaluerollback.moc"