dynamic_cast not working

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:

Code:

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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.

If the cast fails then leaf will be NULL. No need to catch any exceptions. Just test the leaf.

Ahhh, I should really learn to read...

Quote:

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Originally Posted by [URL=http://msdn2.microsoft.com/en-us/library/ms861515.aspx]MSDN[/URL]

The value of a failed cast to pointer type is the null pointer. A failed cast to reference type throws a bad_cast Exception.

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Thanks for the heads up!