Always Declare a Polymorphic Class’ Copy Constructor as Private

Always declare a polymorphic class’ copy constructor as private?this becomes important when you want to use a class in a container class for cloning.

The container class CHolder is a templatized class that holds generic objects. You also have a polymorphic class named CBase and its subclasses CDerived1 and CDerived2.

Suppose the client is storing objects of type CBase:

 CHolder holder;holder.add(new CDerived1);holder.add(new CDerived2);

Consider another container instance:

CHolder holder1 = holder;

You need to copy the contained objects in CHolder‘s copy constructor. However, this results in slicing if the default copy of the contained object’s ctor is involved?because the copy in C++ is always static. Thus, you should declare the virtual clone method in CBase and override in derived.

Share the Post:
Share on facebook
Share on twitter
Share on linkedin

Overview

The Latest

Top 5 B2B SaaS Marketing Agencies for 2023

In recent years, the software-as-a-service (SaaS) sector has experienced exponential growth as more and more companies choose cloud-based solutions. Any SaaS company hoping to stay ahead of the curve in this quickly changing industry needs to invest in effective marketing. So selecting the best marketing agency can mean the difference

technology leadership

Why the World Needs More Technology Leadership

As a fact, technology has touched every single aspect of our lives. And there are some technology giants in today’s world which have been frequently opined to have a strong influence on recent overall technological influence. Moreover, those tech giants have popular technology leaders leading the companies toward achieving greatness.

iOS app development

The Future of iOS App Development: Trends to Watch

When it launched in 2008, the Apple App Store only had 500 apps available. By the first quarter of 2022, the store had about 2.18 million iOS-exclusive apps. Average monthly app releases for the platform reached 34,000 in the first half of 2022, indicating rapid growth in iOS app development.