How to connect a signal from class a to a slot in a class b?

[mekos]

Hello
i have this connection:

//Class A
connect( treeWidgetA, SIGNAL( clicked( const QModelIndex& ) ), this, SLOT( doSomething(const QModelIndex&  ) ) );

//Class A
connect( treeWidgetA, SIGNAL( clicked( const QModelIndex& ) ), this, SLOT( doSomething(const QModelIndex&  ) ) );

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I have to move the doSomething slot in B class too, and i want to connect the B's class treeWidget signal clicked, to the slot doSomething that already exists in class A.is it correct?

//Class B
AClass *aClass;//is it correct?
connect( treeWidgetB, SIGNAL( clicked( const QModelIndex& ) ),aClass , SLOT( doSomething(const QModelIndex&  ) ) );

//Class B
AClass *aClass;//is it correct?
connect( treeWidgetB, SIGNAL( clicked( const QModelIndex& ) ),aClass , SLOT( doSomething(const QModelIndex&  ) ) );

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This approach is not working..am a declaring Aclass wrong in the B's class code?

*the slot doSomething is declared as public slot in class A*

Thanks!