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How to make Comparable Class in C++


You need to do a downcast, there is no generic way to get the radius.
If you are sure the only object passed to it will be of type Circle, then a static cast would suffice.
If that is not the case then try to use a dynamic_cast to check if it is a Circle object. If it fails then just return false.
Note: dynamic_cast would slow down the performance.

bool operator > (Comparable&
op2)
{
    Circle* foo =
dynamic_cast<Circle*>(&op2);
    if (foo && (radius >
foo->getRadius()))
    {
        return true;
    }
    else
    {
        return false;
    }
}

Categories : C++

Related to : How to make Comparable Class in C++
Using Comparable with Generic class
You need to tell Java that T extends Comparable<T>, like this: public static class Node<T extends Comparable<T>> implements Comparable<Node<T>> { protected final T data; protected final List<Node<T>> adj; public Node(T data) { this.data = data; adj = new ArrayList<Node<T>>(); } @Override public int co

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Error extending from an abstract class and implementing the Comparable interface
public int compareTo(GeometricObject g1, GeometricObject g2) { if(g1.getArea()>g2.getArea()) return 1; else if (g1.getArea()<g2.getArea()) return -1; else return 0; } does not correctly override compareTo. compareTo is expected to take one argument and compare this to that argument. This could be implemented as @Override public int compareTo(Geometric

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compareTo(K) in java.lang.Comparable cannot be applied to (java.lang.Comparable)
I think what you are missing is declaring the root instance to use the generic type TreeNode<Key> instead of the raw type TreeNode: class findLargestKElementsInTree<Key extends Comparable<Key>>{ TreeNode<Key> root; ... You should probably replace every place that has the raw type TreeNode with TreeNode<Key>.

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Java Comparable Type
Comparable is an interface, not a class. You can assign the String "6" to a Comparable variable because String implements Comparable<String>. Specifying the type parameter will get rid of the warning : Comparable<String> element = "6";

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Implement comparable with 2 Enums
Every enum constant in Java as an associated ordinal value. This value can be accessed by invoking the ordinal() method on the constant, e.g. SPADE.ordinal(). Once all enum contacts have been arranged in ascending order of their value we can use ordinal to perform the kind of comparison you require.

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