Question

Java doesn’t support multiple inheritance for abstract classes, but I’m trying to do the equivalent of this in C++:

//this is Java-style pseudocode
public abstract class Rectangle{
    public abstract double getHeight();
    public abstract double getWidth();
    public double getHeight(){
        return getWidth()*getHeight();
    }
}

public abstract class Container{
    public abstract void printTypes();
    public abstract void printEachElement();
    public void printContainerStuff(){
        System.out.print("Has the types: ");
        printTypes();
        System.out.print("List of elements: ");
        printEachElement();
    }
}

public abstract class Array extends Rectangle, Container{ //this can't be done in Java, but what about C++?

}

Is there an equivalent of Java abstract classes in C++ that would make it possible to do this?

Answer 1

C++ allows multiple inheritance. So that is allowed in C++.

And the equivalent of Java’s abstract class in C++ is a class that has at least one pure virtual member function.

So the equivalent of the Java code in C++ would be this:

class Rectangle
{
  public:
    virtual double getHeight() = 0;
    virtual double getWidth() = 0;
    double getHeight(){
        return getWidth()*getHeight();
    }
};

class Container(){
  public:
    virtual void printTypes() = 0;
    virtual void printEachElement() =0;
};