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#include <QtCore/QObject>
struct A
{
virtual void foo() { }
};
struct B : public A
{
};
void test()
{
A *a = new A();
B *b = new B();
dynamic_cast<A*>(b); // warning: Casting to base
dynamic_cast<A*>(a); // warning: Casting to itself
dynamic_cast<B*>(a); // OK
dynamic_cast<B*>(b); // warning: Casting to itself
static_cast<A*>(b); // warning: Casting to base
static_cast<A*>(a); // warning: Casting to itself
static_cast<B*>(a); // OK
static_cast<B*>(b); // warning: Casting to itself
}
class MyObj : public QObject
{
Q_OBJECT
public:
};
void testQObjectCast(QObject *o)
{
dynamic_cast<MyObj*>(o); // Warn
qobject_cast<QObject*>(o); // Warn
MyObj myobj;
qobject_cast<QObject*>(&myobj); // Warn
qobject_cast<MyObj*>(o); // OK
}
class FwdDeclared;
class MyObj2 : public QObject
{
public:
Q_DECLARE_PUBLIC(QObject) // OK, in macro
MyObj2 *q_ptr;
};
struct Base2 {};
class Base1 : public QObject {};
class Derived : public Base1, public Base2
{
public:
void test()
{
static_cast<Base1*>(this); // OK
static_cast<Base2*>(this); // OK
}
};
void test2()
{
static_cast<MyObj*>(nullptr); // OK
static_cast<MyObj*>(0); // OK
MyObj *o1;
MyObj2 *o2;
true ? static_cast<QObject*>(o1) : static_cast<QObject*>(o2); // Ok
}
class MyObj4 : public QObject
{
Q_OBJECT
public:
void test()
{
qobject_cast<MyObj4*>(sender()); // OK
}
};
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