Accessing a Class-Internal Type

Here’s a common error: you define a class-internal type, say an enum or typedef, and then try to use it as the return type of that class’s member function:

 class A{public: enum sizes {small, medium, large}; sizes default_size() const{ return medium;}};

Up until now, all is fine. However, at a later stage you decide to move the body of default_size() outside the class:

 sizes A::default_size() const{  return medium;}

All of a sudden, the compiler is moaning and bitching at you that ‘sizes’ is an unknown type. The problem is that outside the scope of class, you must use a qualified name to refer to an internal type, as follows:

 A::sizes A::default_size() const{   return medium;}

remember that the compiler recognizes the non-qualified names defined within a class only within that class’s scope.

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


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.