class StationSongs {
protected:
    int original_song;
};

class NewsRadio: public StationSongs {
public:
    NewsRadio()
    {
        current_song = NULL;
        currently_empty = 0;
        original_song = 0;
        start_time_of_song = 0;
        next_song_to_play = NULL;
    }
};

class CommercialRadio : public StationSongs {
public:
    CommercialRadio() {
        current_song = NULL;
        currently_empty = 0;
        original_song = 0;
        start_time_of_song = 0;
        next_song_to_play = NULL;
    }
};


问题:我想使用继承的类作为map值

地图是:

typedef MtmMap<double, StationSongs*> RadioMap;


method{

    CommercialRadio new_station();

    RadioPair new_pair(stationFrequency,*new_station);

    radio.insert(new_pair);
}


我得到这个错误:

Multiple markers at this line

- no matching function for call to 'mtm::MtmMap<double, mtm::StationSongs*>::Pair::Pair(double&,

mtm::CommercialRadio
     (&)())'


我该如何解决?

最佳答案

CommercialRadio new_station();声明一个不带参数且返回new_station的函数CommercialRadio。删除括号。 C ++语言的此属性称为most vexing parse

此外,您的基类没有定义虚拟析构函数几乎是不正确的。

关于c++ - 使用继承的类作为map值,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/14527146/

10-10 12:32