CODEWITHSUNDEEP
c++inheritancemethodsdictionary
Christine
Christine

Reputation: 113

use inherited classes as map Value

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;
    }
};

The problem : I want to use inherited classes as map Value

The map is:

typedef MtmMap<double, StationSongs*> RadioMap;


method{

    CommercialRadio new_station();

    RadioPair new_pair(stationFrequency,*new_station);

    radio.insert(new_pair);
}

I get This error :

Multiple markers at this line

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

mtm::CommercialRadio 
     (&)())'

How can i Solve this ???

Upvotes: 0

Views: 82

Answers (1)

Konrad Rudolph
Konrad Rudolph

Reputation: 545568

CommercialRadio new_station(); declares a function new_station that takes no arguments and returns a CommercialRadio. Remove the parentheses. This property of the C++ language is known as the most vexing parse.

Furthermore, it’s almost certainly incorrect that your base class doesn’t define a virtual destructor.

Upvotes: 1

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