typedef struct __Bar {
// ...
} Bar, *PBar;

MODULE = Foo::Bar		PACKAGE = Foo::Bar

PBar
new(class);
	const char* class
 PREINIT:
 	PBar        retval;
 CODE:

 	New(0, retval, 1, Bar);

 	RETVAL = retval;
 OUTPUT:
 	RETVAL