Method GetClassIndex

src/picker_gui.h:111–111

	explicit PickerCallbacksNewGRFClass(const std::string &ini_group) : PickerCallbacks(ini_group) {}

	inline typename T::index_type GetClassIndex(int cls_id) const { return static_cast<typename T::index_type>(cls_id); }
	inline const T *GetClass(int cls_id) const { return T::Get(this->GetClassIndex(cls_id)); }
	inline const typename T::spec_type *GetSpec(int cls_id, int id) const { return this->GetClass(cls_id)->GetSpec(id); }