CODEWITHSUNDEEP
qttypesqobject
ak.
ak.

Reputation: 3449

Proper way to check QObject derived class type in Qt

Lets say I have a two classes:

class A : public QObject {};
class B : public QObject {};

then I go 

QObject *a = new A();
QObject *b = new B();

now, how do I make sure that "a" is an instance of class A, and "b" is an instance of class B?

currently I do something like this:

if (a->inherits(A::staticMetaObject.className())) {
...
} else if (a->inherits(A::staticMetaObject.className())) {
...

is there a better way?

Upvotes: 19

Views: 25023

Answers (1)

zweihander
zweihander

Reputation: 6305

You can use qobject_cast<MyClass*>(instance) on QObject derived classes and check the return value. If instance cannot be cast to MyClass*, the return value will be NULL.

Upvotes: 38

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