VIrtual class problem
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by ugur
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Published on 2010-05-02T16:52:57Z
Indexed on
2010/05/02
16:58 UTC
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What i think about virtual class is, if a derived class has a public base, let's say, class base, then a pointer to derived can be assigned to a variable of type pointer to base without use of any explicit type conversion. But what if, we are inside of base class then how can we call derived class's functions. I will give an example:
class Graph{
public:
Graph(string);
virtual bool addEdge(string,string);
}
class Direct:public Graph{
public:
Direct(string);
bool addEdge(string,string);
}
Direct::Direct(string filename):Graph(filename){};
When i call constructor of Direct class then it calls Graph. Now lets think Graph function calls addedge.
Graph(string str){
addedge(str,str);
}
When it calls addedge, even if the function is virtual, it calls Graph::edge. What i want is, to call Direct::addedge. How can it be done?
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