Tag Archives: override

• About
• Latest Posts

Glennan Carnie

Technical Consultant at Feabhas Ltd

Glennan is an embedded systems and software engineer with over 20 years experience, mostly in high-integrity systems for the defence and aerospace industry.

He specialises in C++, UML, software modelling, Systems Engineering and process development.

Latest posts by Glennan Carnie (see all)

• Practice makes perfect, part 3 – Idiomatic kata - February 27, 2020
• Practice makes perfect, part 2– foundation kata - February 13, 2020
• Practice makes perfect, part 1 – Code kata - January 30, 2020

Override specifier

In C++98 using polymorphic types can sometimes lead to head-scratching results:

On the face of it this code looks sound; indeed it will compile with no errors or warnings. However, when it runs the Base version of op() will be executed!

The reason? Derived’s version of op() is not actually an override of Base::op since int and long are considered different types (it’s actually a conversion between an int and a long, not a promotion)

The compiler is more than happy to […]