Hi,
	Could someone point me to documentation or provide an example on how to use constructor validator to handle the following case:
	class Foo;
	struct Bar
	{ 
		Bar(const Foo&, int);
		Bar(int,  int);
		…
	};
	I would like to find a way for the R user to build a Bar object using either one of the constructors. 
	Your help is much appreciated!
Hong