问题描述
我怎样才能拥有不同对象的变体 const metricId = props.match.params.metricId;
const catalog = useSelector<RootState,MetricState>(
(state) => state.fetchMetrics
);
const selectedMetric: IMetric = {
name: "",owner: { team: "" }
};
const dispatch = usedispatch();
useEffect(() => {
dispatch(appReducer.actionCreators.fetchMetric(catalog,metricId));
},[]);
其中 A,B,C
具有对变体的引用?
C
解决方法
如果顺序正确,您可能会:
class A {
//...
};
class B {
//...
};
class C;
using PossibleValues = std::variant<A,B,C>;
class C {
//...
std::vector<PossibleValues> storage; // reference to variant
//...
};