The Code is as follow :
The Code :
#include <iostream>
using namespace std;
class Animal{
int a;
public:
Animal(int a) : a(a){}
int geta(){return a;}
};
class Bird : virtual public Animal{
string b;
public:
Bird(int a , string b) : Animal(a) , b(b){}
};
class Fish : virtual public Animal{
int f;
public:
Fish(int a , int f) : Animal(a) , f(f){}
};
class Unknown : public Bird, public Fish{
char u;
public:
Unknown(int a , int f , string b , char u )
: Bird(a , b) , Fish(a , f) , u(u){} //Problem
};
1.)How am I going to initialize all the superclass if the Unknown class is instantiated?Since there's only one instance of Animal will be created , how can I avoid mysef from having to call its constructor twice ?
Thank you
The most derived class initializes any virtual base classes. In your class hierarchy, Unknown
must construct the virtual Animal
base class (e.g. by adding Animal(a)
to its initialization list).
When constructing an Unknown
object, neither Fish
nor Bird
will call the Animal
constructor. Unknown
will call the constructor for the Animal
virtual base.
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