Got a Problem with abstract classes in my map Programm

Trockzor

Hello guys,

i got a task from university, in which i should use a given abstract class in order to create and display a map with cities and streets.
This is the given abstract class:
/**
///
#ifndef ABSTRACTMAP
#define ABSTRACTMAP

#include "city.h"
#include "street.h"

class AbstractMap {
public:
typedef std::vector<city *> CityList;
typedef std::vector<Street *> StreetList;

/// Adds the provided city to this map.
virtual void addCity(city *) = 0;

/** Adds the provided street to this map. If the cities linked by the street
 *  have not been added to this map before, the street is not added.
 *
 * Return true if the street has beed added.
 */
virtual bool addStreet(Street *) = 0;

/**
 * @brief Search for a city in this map by given name.
 * @param name
 * @return the city pointer, if city not found NULL
 */

// virtual City* find_city(const QString city_name) const = 0;

/**
 * @brief Search for streets in this map.
 * @param city where you want the street_list from
 * @return a list of all streets in this map connected to provided city.
 */

// virtual StreetList get_street_list(const City* city) const = 0;

/**
 * @brief Look for opposite city.
 * @param street
 * @param city
 * @return opposite city of the street. If city has no connection to street returns NULL.
 */

// virtual City * get_opposite_city(const Street* street, const City* city) const = 0;

/**
 * @brief Calculate the street length.
 * @param street
 * @return length of the street
 */

// virtual double get_length(const Street* street) const = 0;
};

#endif // ABSTRACTMAP

*//
The next one is also given:

#ifndef MAPIO_H
#define MAPIO_H

#include "abstractmap.h"

/// This class adds Cities and Streeds to a Map.
class MapIo
{
public:
/// this method adds Cities and Streets to the provided Map.
virtual void fillMap(AbstractMap &map) = 0;
};

#endif // MAPIO_H

**This is the class used to add streets and cities to the map.

Now my Problem**

void MainWindow::on_pushButton_2_clicked()
{
MapIo::fillMap(&AbstractMap );
}

How can i give an &AbstractMap object from a class which is abstract so no object can be created from it? How can i solve this? The Parameters are given so i cant change them?

Would be really nice if some one could help me.
If you need further information just ask me.
Regards

SGaist

Hi and welcome to devnet,

Implement your own subclass of these abstract classes.

From your code sample, it looks like you are fairly new to C++. You should first study the language basics before going further.