How Can We Use The is_final Type Trait In C++ 14?

In C++11, the final specifier is used for a function or for a class that cannot be overridden by derived classes, and there was no way to check if that class or method is the final. In C++14, there is a std::is_final type trait that can be used to detect if a class or a method is marked as a final or not. In this post, we explain how we can use the std::is_final type trait in C++14 and C++17.

What is the final specifier in modern C++?

The final specifier (keyword) is used for a function or for a class that cannot be overridden by derived classes. Regarding virtual overrides, C++11 tends to tighten the rules, to detect some problems that often arise. To achieve this goal C++11 introduced a new contextual keyword, the final specifier. The final keyword specifies that a method cannot be overridden, or a class cannot be derived. If you want to learn more about it, here it is,

Learn How To Use The Final Specifier In Modern C++

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What is the std::is_final type trait in C++ 14?

The std::is_final type trait (UnaryTypeTrait) defined in <type_traits> detects if a class is marked final and returns true or false boolean. If a class or method is final, it returns the member constant value equal to true, if not returns the value is false.

Here is the syntax (since C++14).

How can we use the std::is_final type trait in C++ 14?

We can use the std::is_final type trait to check classes if it is marked as a final or not. Here is a simple example.

Is there a full example about the std::is_final type trait ?

Here is a full example about to use the std::is_final type trait in C++14 and C++17.

For more information, please see https://cplusplus.github.io/LWG/issue2112

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