(VS .NET) C2091: function returns function

I'm getting the above error on the following line of code:

	template< typename T > struct DXComponentZMapper
	{
		typedef unsigned int KeyType;
		const KeyType getKey()(const T& o)
		{ return o->getZOrder(); } // Compiler error here...
	};
  

which is declared in this:

	TSortTree< DXComponent*, DXComponentZMapper > CompTree;
  

where TSortTree has the following declaration:

	template<	typename T
		, template< class > class MappingPolicy = TrivialKeyMapper
		, template< class > class AllocatorPolicy = StandardNodeAllocator
		, template< class > class BalancerPolicy = NeverTreeBalancer >
	class TSortTree {
		// ....
	};
  

Does anybody know why this happens? Does it have anything to do with including STL ? Thanks a lot, Jeff Edit: Fixed the angle brackets...grr [edited by - rypyr on February 3, 2004 10:28:56 AM]