Constructors – Derived to Base

Constructors – Derived to Base

My base class contains this constructor:

class Parent {  Parent(int a, int b, char* c);};

My derived class contains this constructor:

class Child : public Parent {  Child(int a);};

defined as

Child::Child(int a) : Parent(a,2){  .. some code}

I need a third class derived from class Childclass Grandchild :

public Child {  Grandchild(int a);};

but I can’t figure out how to define the constructor. I’ve tried:

Grandchild::Grandchild(int a):Child (a,2)Grandchild::Grandchild(int a):Parent(a,2)Grandchild::Grandchild(int a):Child(a):Parent(2)Grandchild::Grandchild(int a):Child(a),Parent(2)

You can’t initialize a non-immediate base class in a derived class (virtual base classes are an exception to this rule). What you need is to have class GrandChild initialize Child, and delegate the responsibility of initializing Parent to Child’s constructor:

class Grandchild : public Child { Grandchild(int a):Child (a,2){}//implicit init of Parent};

Child’s constructor automatically initializes Parent with the values a and 2.

See also - an AI reverse image search platform

About Our Editorial Process

At DevX, we’re dedicated to tech entrepreneurship. Our team closely follows industry shifts, new products, AI breakthroughs, technology trends, and funding announcements. Articles undergo thorough editing to ensure accuracy and clarity, reflecting DevX’s style and supporting entrepreneurs in the tech sphere.

See our full editorial policy.

About Our Journalist