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/****************************************************************************
**
** Copyright (C) 2018 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Sérgio Martins <sergio.martins@kdab.com>
** Copyright (C) 2019 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the test suite of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** 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 The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtTest/QtTest>
#include <QtCore/QScopeGuard>
/*!
\class tst_QScopeGuard
\internal
\since 5.11
\brief Tests class QScopeGuard and function qScopeGuard
*/
class tst_QScopeGuard : public QObject
{
Q_OBJECT
private Q_SLOTS:
void construction();
void constructionFromLvalue();
void constructionFromRvalue();
void leavingScope();
void exceptions();
};
void func()
{
}
int intFunc()
{
return 0;
}
Q_REQUIRED_RESULT int noDiscardFunc()
{
return 0;
}
struct Callable
{
Callable() { }
Callable(const Callable &other)
{
Q_UNUSED(other);
++copied;
}
Callable(Callable &&other)
{
Q_UNUSED(other);
++moved;
}
void operator()() { }
static int copied;
static int moved;
static void resetCounts()
{
copied = 0;
moved = 0;
}
};
int Callable::copied = 0;
int Callable::moved = 0;
static int s_globalState = 0;
void tst_QScopeGuard::construction()
{
#ifdef __cpp_deduction_guides
QScopeGuard fromLambda([] { });
QScopeGuard fromFunction(func);
QScopeGuard fromFunctionPointer(&func);
QScopeGuard fromNonVoidFunction(intFunc);
QScopeGuard fromNoDiscardFunction(noDiscardFunc);
QScopeGuard fromStdFunction{std::function<void()>(func)};
std::function<void()> stdFunction(func);
QScopeGuard fromNamedStdFunction(stdFunction);
#else
QSKIP("This test requires C++17 Class Template Argument Deduction support enabled in the compiler.");
#endif
}
void tst_QScopeGuard::constructionFromLvalue()
{
#ifdef __cpp_deduction_guides
Callable::resetCounts();
{
Callable callable;
QScopeGuard guard(callable);
}
QCOMPARE(Callable::copied, 1);
QCOMPARE(Callable::moved, 0);
Callable::resetCounts();
{
Callable callable;
auto guard = qScopeGuard(callable);
}
QCOMPARE(Callable::copied, 1);
QCOMPARE(Callable::moved, 0);
#else
QSKIP("This test requires C++17 Class Template Argument Deduction support enabled in the compiler.");
#endif
}
void tst_QScopeGuard::constructionFromRvalue()
{
#ifdef __cpp_deduction_guides
Callable::resetCounts();
{
Callable callable;
QScopeGuard guard(std::move(callable));
}
QCOMPARE(Callable::copied, 0);
QCOMPARE(Callable::moved, 1);
Callable::resetCounts();
{
Callable callable;
auto guard = qScopeGuard(std::move(callable));
}
QCOMPARE(Callable::copied, 0);
QCOMPARE(Callable::moved, 1);
#else
QSKIP("This test requires C++17 Class Template Argument Deduction support enabled in the compiler.");
#endif
}
void tst_QScopeGuard::leavingScope()
{
auto cleanup = qScopeGuard([] { s_globalState++; QCOMPARE(s_globalState, 3); });
QCOMPARE(s_globalState, 0);
{
auto cleanup = qScopeGuard([] { s_globalState++; });
QCOMPARE(s_globalState, 0);
}
QCOMPARE(s_globalState, 1);
s_globalState++;
}
void tst_QScopeGuard::exceptions()
{
s_globalState = 0;
bool caught = false;
QT_TRY
{
auto cleanup = qScopeGuard([] { s_globalState++; });
QT_THROW(std::bad_alloc()); //if Qt compiled without exceptions this is noop
s_globalState = 100;
}
QT_CATCH(...)
{
caught = true;
QCOMPARE(s_globalState, 1);
}
QVERIFY((caught && s_globalState == 1) || (!caught && s_globalState == 101));
}
QTEST_MAIN(tst_QScopeGuard)
#include "tst_qscopeguard.moc"
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