C++ 一起初始化引用和分配变量

Question

我的代码中有这一部分，我在同一布尔条件下使用 if else 和三元运算符。有没有更优雅的方法来做到这一点？

bool UseGroups //input parameter to a function.

    std::vector<std::vector<int>>& relevantGamesGroup = (useGroups) ? (objFlight.gamesGroup[dayIndex]) : (objFlight.gamesSubGroups[dayIndex]);

    if (useGroups) {
        numberOfGroups = objFlight.numberOfGroups[dayIndex];
    }
    else {
        numberOfGroups = 2 * (objFlight.numberOfGroups[dayIndex]);
    }

Answer 1

我可能会这样写，因为我觉得读起来很清楚：

auto& relevantGamesGroup = useGroups
    ? objFlight.gamesGroup[dayIndex]
    : objFlight.gamesSubGroups[dayIndex];
auto numberOfGroups = useGroups
    ? objFlight.numberOfGroups[dayIndex]
    : objFlight.numberOfGroups[dayIndex] * 2;