FoNeutralFoIface
#define FO_NEUTRAL_FO_IFACE(obj) (G_TYPE_CHECK_CLASS_CAST ((obj), FO_TYPE_NEUTRAL_FO, FoNeutralFoIface))
typedef struct _FoNeutralFo FoNeutralFo;
struct FoNeutralFoIface { GTypeInterface g_iface; };