qt5base-lts/tests/auto/qscopedpointer/tst_qscopedpointer.cpp
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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12
2011-04-27 12:05:43 +02:00

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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** This file is part of the test suite of the Qt Toolkit.
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#include <QtTest/QtTest>
#include <QtCore/QScopedPointer>
/*!
\class tst_QScopedPointer
\internal
\since 4.6
\brief Tests class QScopedPointer.
*/
class tst_QScopedPointer : public QObject
{
Q_OBJECT
private Q_SLOTS:
void defaultConstructor();
void dataOnDefaultConstructed();
void useSubClassInConstructor();
void dataOnValue();
void dataSignature();
void reset();
void dereferenceOperator();
void dereferenceOperatorSignature();
void pointerOperator();
void pointerOperatorSignature();
void negationOperator();
void negationOperatorSignature();
void operatorBool();
void operatorBoolSignature();
void isNull();
void isNullSignature();
void objectSize();
void comparison();
// TODO instanciate on const object
};
void tst_QScopedPointer::defaultConstructor()
{
/* Check that the members, one, is correctly initialized. */
QScopedPointer<int> p;
QCOMPARE(p.data(), static_cast<int *>(0));
}
void tst_QScopedPointer::dataOnDefaultConstructed()
{
QScopedPointer<int> p;
QCOMPARE(p.data(), static_cast<int *>(0));
}
class MyClass
{
};
class MySubClass : public MyClass
{
};
void tst_QScopedPointer::useSubClassInConstructor()
{
/* Use a syntax which users typically would do. */
QScopedPointer<MyClass> p(new MyClass());
}
void tst_QScopedPointer::dataOnValue()
{
int *const rawPointer = new int(5);
QScopedPointer<int> p(rawPointer);
QCOMPARE(p.data(), rawPointer);
}
void tst_QScopedPointer::dataSignature()
{
const QScopedPointer<int> p;
/* data() should be const. */
p.data();
}
void tst_QScopedPointer::reset()
{
/* Call reset() on a default constructed value. */
{
QScopedPointer<int> p;
p.reset();
QCOMPARE(p.data(), static_cast<int *>(0));
}
/* Call reset() on an active value. */
{
QScopedPointer<int> p(new int(3));
p.reset();
QCOMPARE(p.data(), static_cast<int *>(0));
}
/* Call reset() with a value, on an active value. */
{
QScopedPointer<int> p(new int(3));
int *const value = new int(9);
p.reset(value);
QCOMPARE(*p.data(), 9);
}
/* Call reset() with a value, on default constructed value. */
{
QScopedPointer<int> p;
int *const value = new int(9);
p.reset(value);
QCOMPARE(*p.data(), 9);
}
}
class AbstractClass
{
public:
virtual ~AbstractClass()
{
}
virtual int member() const = 0;
};
class SubClass : public AbstractClass
{
public:
virtual int member() const
{
return 5;
}
};
void tst_QScopedPointer::dereferenceOperator()
{
/* Dereference a basic value. */
{
QScopedPointer<int> p(new int(5));
const int value2 = *p;
QCOMPARE(value2, 5);
}
/* Dereference a pointer to an abstract class. This verifies
* that the operator returns a reference, when compiling
* with MSVC 2005. */
{
QScopedPointer<AbstractClass> p(new SubClass());
QCOMPARE((*p).member(), 5);
}
}
void tst_QScopedPointer::dereferenceOperatorSignature()
{
/* The operator should be const. */
{
const QScopedPointer<int> p(new int(5));
*p;
}
/* A reference should be returned, not a value. */
{
const QScopedPointer<int> p(new int(5));
Q_UNUSED(static_cast<int &>(*p));
}
/* Instantiated on a const object, the returned object is a const reference. */
{
const QScopedPointer<const int> p(new int(5));
Q_UNUSED(static_cast<const int &>(*p));
}
}
class AnyForm
{
public:
int value;
};
void tst_QScopedPointer::pointerOperator()
{
QScopedPointer<AnyForm> p(new AnyForm());
p->value = 5;
QCOMPARE(p->value, 5);
}
void tst_QScopedPointer::pointerOperatorSignature()
{
/* The operator should be const. */
const QScopedPointer<AnyForm> p(new AnyForm);
p->value = 5;
QVERIFY(p->value);
}
void tst_QScopedPointer::negationOperator()
{
/* Invoke on default constructed value. */
{
QScopedPointer<int> p;
QVERIFY(!p);
}
/* Invoke on a value. */
{
QScopedPointer<int> p(new int(2));
QCOMPARE(!p, false);
}
}
void tst_QScopedPointer::negationOperatorSignature()
{
/* The signature should be const. */
const QScopedPointer<int> p;
!p;
/* The return value should be bool. */
static_cast<bool>(!p);
}
void tst_QScopedPointer::operatorBool()
{
/* Invoke on default constructed value. */
{
QScopedPointer<int> p;
QCOMPARE(bool(p), false);
}
/* Invoke on active value. */
{
QScopedPointer<int> p(new int(3));
QVERIFY(p);
}
}
void tst_QScopedPointer::operatorBoolSignature()
{
/* The signature should be const and return bool. */
const QScopedPointer<int> p;
(void)static_cast<bool>(p);
}
void tst_QScopedPointer::isNull()
{
/* Invoke on default constructed value. */
{
QScopedPointer<int> p;
QVERIFY(p.isNull());
}
/* Invoke on a set value. */
{
QScopedPointer<int> p(new int(69));
QVERIFY(!p.isNull());
}
}
void tst_QScopedPointer::isNullSignature()
{
const QScopedPointer<int> p(new int(69));
/* The signature should be const and return bool. */
static_cast<bool>(p.isNull());
}
void tst_QScopedPointer::objectSize()
{
/* The size of QScopedPointer should be the same as one pointer. */
QCOMPARE(sizeof(QScopedPointer<int>), sizeof(void *));
}
struct RefCounted
{
RefCounted()
: ref(0)
{
instanceCount.ref();
}
RefCounted(RefCounted const &)
: ref(0)
{
instanceCount.ref();
}
~RefCounted()
{
QVERIFY( ref == 0 );
instanceCount.deref();
}
RefCounted &operator=(RefCounted const &)
{
return *this;
}
QAtomicInt ref;
static QAtomicInt instanceCount;
};
QAtomicInt RefCounted::instanceCount = 0;
template <class A1, class A2, class B>
void scopedPointerComparisonTest(const A1 &a1, const A2 &a2, const B &b)
{
// test equality on equal pointers
QVERIFY(a1 == a2);
QVERIFY(a2 == a1);
// test inequality on equal pointers
QVERIFY(!(a1 != a2));
QVERIFY(!(a2 != a1));
// test equality on unequal pointers
QVERIFY(!(a1 == b));
QVERIFY(!(a2 == b));
QVERIFY(!(b == a1));
QVERIFY(!(b == a2));
// test inequality on unequal pointers
QVERIFY(b != a1);
QVERIFY(b != a2);
QVERIFY(a1 != b);
QVERIFY(a2 != b);
}
void tst_QScopedPointer::comparison()
{
QCOMPARE( int(RefCounted::instanceCount), 0 );
{
RefCounted *a = new RefCounted;
RefCounted *b = new RefCounted;
QCOMPARE( int(RefCounted::instanceCount), 2 );
QScopedPointer<RefCounted> pa1(a);
QScopedPointer<RefCounted> pa2(a);
QScopedPointer<RefCounted> pb(b);
scopedPointerComparisonTest(pa1, pa1, pb);
scopedPointerComparisonTest(pa2, pa2, pb);
scopedPointerComparisonTest(pa1, pa2, pb);
pa2.take();
QCOMPARE( int(RefCounted::instanceCount), 2 );
}
QCOMPARE( int(RefCounted::instanceCount), 0 );
{
RefCounted *a = new RefCounted[42];
RefCounted *b = new RefCounted[43];
QCOMPARE( int(RefCounted::instanceCount), 85 );
QScopedArrayPointer<RefCounted> pa1(a);
QScopedArrayPointer<RefCounted> pa2(a);
QScopedArrayPointer<RefCounted> pb(b);
scopedPointerComparisonTest(pa1, pa2, pb);
pa2.take();
QCOMPARE( int(RefCounted::instanceCount), 85 );
}
QCOMPARE( int(RefCounted::instanceCount), 0 );
{
// QScopedSharedPointer is an internal helper class -- it is unsupported!
RefCounted *a = new RefCounted;
RefCounted *b = new RefCounted;
QCOMPARE( int(RefCounted::instanceCount), 2 );
QSharedDataPointer<RefCounted> pa1(a);
QSharedDataPointer<RefCounted> pa2(a);
QSharedDataPointer<RefCounted> pb(b);
QCOMPARE( int(a->ref), 2 );
QCOMPARE( int(b->ref), 1 );
QCOMPARE( int(RefCounted::instanceCount), 2 );
scopedPointerComparisonTest(pa1, pa2, pb);
QCOMPARE( int(RefCounted::instanceCount), 2 );
}
QCOMPARE( int(RefCounted::instanceCount), 0 );
}
QTEST_MAIN(tst_QScopedPointer)
#include "tst_qscopedpointer.moc"