dynamic_cast not working

[kloffy]

Do I need to recompile qmake with the exceptions, rtti and stl flags to get dynamic_cast to work with QT? I'm using Visual C++ 2005 and the /GR flag is enabled (by default).

I'm asking because have implemented a simple Composite Pattern and I need to find out whether the Component is a Leaf or a Composite. This is what I would like to do:

try
{
	Leaf* leaf = dynamic_cast<Leaf*>(component);
	//A Leaf
}
catch (std::bad_cast e)
{
	//Not a Leaf
}

try
{
	Leaf* leaf = dynamic_cast<Leaf*>(component);
	//A Leaf
}
catch (std::bad_cast e)
{
	//Not a Leaf
}

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However, in practice the exception is never thrown and the program dies because of memory access violations.