Object
Object-
-Oriented Programming
Oriented Programming
(OOP)
(OOP)
Lecture No. 31
Lecture No. 31
Multiple Inheritance
Multiple Inheritance
►
►
A class can inherit from more then one class
A class can inherit from more then one class
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Multiple Inheritance in Object-Oriented Programming: Ambiguity and Resolution, Slides of Object Oriented Programming
The concept of multiple inheritance in object-oriented programming (oop) and its implications on function ambiguity. It covers the transmitter and receiver classes, the mermaid example, and the ambiguous call problem. The document also provides solutions to the ambiguity problem and discusses the memory layout of derived classes.
Typology: Slides
2011/2012
1 / 18
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Object
Object
Oriented Programming
Oriented Programming
(OOP)
(OOP)
Lecture No. 31
Lecture No. 31
Multiple Inheritance
Multiple Inheritance
Transmitter
Transmit()
Receiver
Receive()
Phone
Example
Example
int main(){
int main(){
Phone obj;
Phone obj;
obj.Transmit();
obj.Transmit();
obj.Receive();
obj.Receive();
return 0;
return 0;
Example
Example
int main(){
int main(){
Phone obj;
Phone obj;
Transmitter * tPtr = &obj;
Transmitter * tPtr = &obj;
Receiver * rPtr = &obj;
Receiver * rPtr = &obj;
return 0;
return 0;
Multiple Inheritance
Multiple Inheritance
►
► If more than one base class have a function
If more than one base class have a function
with same signature then the child will have
with same signature then the child will have
two copies of that function
two copies of that function
►
► Calling such function will result in ambiguity
Calling such function will result in ambiguity
Example
Example
class LandVehicle{
class LandVehicle{
public:
public:
int GetMaxLoad(); int GetMaxLoad();
}; };
class WaterVehicle{ class WaterVehicle{
public:
public:
int GetMaxLoad();
int GetMaxLoad();
};
};
Multiple Inheritance
Multiple Inheritance
►
► The ambiguous call problem can arise when
The ambiguous call problem can arise when
dealing with multiple level of multiple
dealing with multiple level of multiple
inheritance
inheritance
Example
Example
class Vehicle{
class Vehicle{
public:
public:
int GetMaxLoad(); int GetMaxLoad();
}; };
class LandVehicle : public Vehicle{ class LandVehicle : public Vehicle{
};
};
class WaterVehicle : public Vehicle{
class WaterVehicle : public Vehicle{
};
};
Example
Example
int main(){
int main(){
AmphibiousVehicle obj;
AmphibiousVehicle obj;
obj.LandVehicle::GetMaxLoad();
obj.LandVehicle::GetMaxLoad();
obj.WaterVehicle::GetMaxLoad();
obj.WaterVehicle::GetMaxLoad();
return 0;
return 0;
Example
Example
class Vehicle{
class Vehicle{
protected:
protected:
int weight; int weight;
}; };
class LandVehicle : public Vehicle{ class LandVehicle : public Vehicle{
};
};
class WaterVehicle : public Vehicle{
class WaterVehicle : public Vehicle{
};
};
Example
Example
class Vehicle{ class Vehicle{
protected:
protected:
int weight;
int weight;
}; };
class LandVehicle :
class LandVehicle :
public virtual Vehicle{ public virtual Vehicle{
}; };
class WaterVehicle :
class WaterVehicle :
public virtual Vehicle{ public virtual Vehicle{
};
};