Dynamic Binding in C++: Explanation, Functions & Implementation

The aim of this article is to explain how dynamic linking works in C++. You should have a clear understanding of how inheritance and static binding operate in C++. This is because dynamic binding removes any of the drawbacks of static binding. We’ll demonstrate the benefits of dynamic linking using proper and basic JavaScript.

What is Dynamic Binding, and how does it work?

Binding refers to the process of connecting two objects. Binding is not that far from programming languages. It’s the process of connecting a function description to a function call. Then why the word “dynamic”? In basic terms, dynamic binding means deferring the decision over which feature to run before its execution time. In C++, we use dynamic binding to determine which function we can call depending on the object’s underlying nature.

Static binding did not provide programmers with this versatility. Static linking was formerly done at compile time rather than run time. Furthermore, static binding linked function calls and definitions at compile time, while dynamic binding does not do so before run time, as you now know.

Dynamic binding helps us to neglect type distinctions by allowing us to choose the type of function we need at any given time during runtime. We may deduce from this assertion that dynamic binding helps one to manage multiple objects with a single function name. This reduces the complexity of the code and makes debugging easy for the programmer.

Virtual Functions

In C++, we’ve learned a lot about dynamic linking. So how do you go about doing that? You’ll need to use virtual functions in your C++ code to implement dynamic binding. What are virtual functions, exactly?

Digital functions would not be discussed in depth in this article because they are relevant enough to warrant their own article. However, you will be given enough knowledge about virtual functions to fully comprehend dynamic linking.

Virtual functions are special member functions to which calls made through a pointer (or reference) are resolved at runtime depending on the object’s form. Simply put, if a virtual function is specified in a base class, it can be overridden in derived classes.

The power of virtual functions can be seen in this example. A virtual function is defined in C++ by using the keyword ‘virtual’ at the start of the function specification. Since if a function is declared “virtual,” it will stay “virtual” in all derived classes, you do not need to repeat the keyword virtual for each derived class of a base class.

Conclusion

We went over the principle of dynamic linking in C++ in this paper. To conclude, dynamic binding provides us with consistency by allowing us to call a single method to handle multiple objects. As you can see from our code, we used the same feature display() to create two different outputs by using two different artefacts. This is possible because, unlike static binding, which occurs at compile time, dynamic binding occurs at runtime.

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