Dynamic Binding : Difference Between Dynamic and Static Binding in C++

Dynamic Binding in C++

Dynamic binding in C++ gives rise to various benefits. Firstly, dynamic binding simplifies the code generated for every function call. Secondly, dynamic binding reduces the overhead cost of a C++ program by re-uses many routine functions, eliminates redundant function calls, and facilitates error checking and refactoring. These features result in increased performance and reduced debugging time. The C++ programming language makes extensive use of the keywords static, dynamic, and cost. Also, templates and specialized pre-compiled headers are C++ programming’s power tools.

Dynamic binding in C++ gives rise to various other advantages. First, dynamic binding in C++ simplifies code generation. In the case of compiled languages, dynamic binding is the link from a function call to the function definition. In dynamic binding in C++ the generated code consists of a template and an instance of the base class. The template is implemented as a class in the C++ programming language. Hence, if we consider the example of virtual functions, then the link from the virtual function to its base class is not necessary and hence eliminated.

One of the other important advantage is that dynamic binding in C++ allows easy code re-use. In C++ the dynamic binding in C++ allows us to create a static data type that can be utilized in multiple ways. The static data types are unique only within the source code of the program. Hence in a dynamic binding in C++ the programmer uses the type dynamic for a specific purpose, and can later on use the static data type for other purposes, such as in the dynamic inheritance hierarchy.

The major disadvantage of the dynamic binding in C++ is that it makes the program verbose, as the generated code is long. The verbose code makes the program difficult to understand and adapt to various situations. C++ offers dynamic binding in C++ with a couple of macros, which allow programmers to overcome the above mentioned disadvantages. However, these macros have certain limitations and one of them is that the generated code cannot be static as dynamic binding in C++ offers.

Another important disadvantage of the dynamic binding in C++ is that it creates multiple copies of each virtual function, when the function needs to be called multiple times. This results in an increase in the size of the allocated memory. For the static binding in C++ the generated code is short and simple, thus ensuring the maximum utilization of the allocated memory. static binding in C++ also ensures that the interface can be changed with little changes without modifying any code.

The static form of the binding in C++ requires additional overhead compared to dynamic binding. static binding in C++ creates multiple copies of every virtual function when the function needs to be called multiple times. For the dynamic binding in C++ the generated code is not much long, therefore there is no increase in the allocation of the allocated memory. A dynamic binding in C++ also ensures that the interface can be changed with little changes without modifying any code.

Now let us see how the dynamic binding in C++ works when a virtual function from the derived class is called by a base class object. When the base class it calls the virtual function from the derived class of, the base class it gets the address of the function. Then c gets the address of the base class is, this being the case when two or more base classes are used in the program. Here the generated code will be the same as the actual interface.

The dynamic binding in C++ is a compile time error free method of having functions called simultaneously. If the compiler can be smart enough to generate a code that performs the set of function calls without any overhead, then it would be perfect. However C++ compiler cannot be such a smart machine and at times produces the error shown above. However it is possible to make the code dynamic binding in C++ by adding extra preprocessing to the code. This is however an off shoot of the issue discussed above.

The Difference Between Dynamic And Static Binding in C++

Dynamic and static binding in C++ programming are considered to be two different but similar solutions to the same problem. The primary difference is that a static binding is static while the dynamic binding is dynamic. In a static binding, a static variable or structure is used as part of the solution for a function call. The static variable is saved during the function call and will be available again during the function call back. This can be used when the function is called repeatedly.

There are various reasons why static and dynamic binding in c++ programming may be required. First of all, it simplifies the code. When a static binding is used, the programmer will not have to concern about creating a temporary static binding every time a variable needs to be accessed from a different source or when a static variable needs to be changed. In addition, static and dynamic binding in c++ simplifies the test and code maintenance.

When the static and dynamic binding in c++ programming is done correctly, the generated program will always ensure that a base pointer is never set before a member function is called. This ensures that no memory conflict occurs while using the class. If any such memory conflict occurs, the program will be safe as long as the derived class functions always return an int rather than an int and base pointer is never set.

Another reason why static and dynamic binding in c++ happens at compile-time is to avoid multiple copies of certain classes. Sometimes when multiple inheritance is done, a class can be derived from more than one base class and static and dynamic binding happens automatically during the compiling process. For example, if you want to create a template class, then you can derive from template specialization that is implemented by a base class. If such template specialization is implemented by different base classes, then the generated program will generate the correct implementation for each base class with static and dynamic binding happening automatically. This reduces the overall source burden on the programmer.

The C++ standard defines two kinds of binding in c++ namely static and dynamic binding. A static binding occurs only at the definition of a function and no other place in the file. Dynamic binding is also implied by the C++ standard and occurs at the point of definition of a template or function. A static binding is a convenient shortcut for programmers wishing to achieve a static type at the function declaration and static typing at the function call.

A static binding occurs only at the point of usage of a function and is therefore less costly than dynamic binding. Dynamic binding occurs at the point of use of a template or function and is therefore usually a more expensive process. This is because a static binding only binds a single variable whereas a dynamic binding allows more binding to take place. The additional binding can occur at various places throughout the program code and is therefore potentially very significant when dealing with large programs. However, C++ gives its programmers a convenient way of performing a static binding with the help of templates and functions that allow the programmer to provide a static type upfront without the need for an additional feature.

The static type in C++ comes in very handy for the programmer who wishes to be able to create dynamically instantiated versions of any C++ template. For example, if one wishes to create a pointer to an int, then the programmer can simply use the pointer to an int typedef instead of creating a new unique pointer. In contrast, if one intends to create a derived class, then the programmer must know how to instantiate the derived class from the base class. One way of doing this is to use the keyword static inside the derived class definition. Another way is to use the keyword volatile, which will make the object volatile instead of non-volatile. The static type will ensure that the derived class will be created only once and will not be recreated unless otherwise requested.

The static binding happens only at compile time where the compiler determines the types and sizes of the functions and objects. At compile time, the compiler stores the data into a temporary variable and then performs the function call to get the function or objects needed. As such static bindings are invisible to the naked eye during the execution of the program. This means that static typing is a convenient way of coding when the needs arise for dynamic binding but static cannot be applied during function calls because the function call would be a compile-time error.