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Answered 2014-11-20 06:16:21

Runtime polymorphism is also called as method overriding, late binding or dynamic polymorphism. It is when a method in a subclass overrides a method in its super class with the same name and signature.

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Polymorphism is Greek for "many forms". There are two types of polymorphism: static and dynamic. Static polymorphism occurs at compile time and is also known as compile time polymorphism. Dynamic polymorphism occurs at runtime and is also known as runtime polymorphism. Runtime polymorphism is a primary feature of the object-oriented programming paradigm. We achieve runtime polymorphic behaviour by defining virtual methods in a base class which derived classes can then override in order to provide more specialised implementations. Whenever we invoke one of these methods, the most-specialised override is executed automatically. In other words, polymorphic objects will behave according to their runtime type even when the runtime type cannot be determined at compile time.

In static polymorphism is exhibited at compilation time, where as dynamic exhibited at runtime...

Runtime prolymorphism means overriding compiletile polymorphism means overloading

two types are compiletime and runtime polyymorphism

Runtime prolymorphism means overriding compiletile polymorphism means overloading

In C++, compile-time polymorphism is achieved through the use of template metaprogramming while runtime polymorphism is achieved through virtual functions.

The simple answer is that compile-time polymorphism occurs at compile time while runtime polymorphism occurs at runtime. The actual answer is that compile-time polymorphism results in the compiler generating source code on your behalf while runtime polymorphism relies on function pointers or virtual methods to determine the next instruction at runtime. Compile-time polymorphism therefore applies to template functions and classes since that is the only way the compiler can generate source code on your behalf. To achieve this, the runtime type for the template parameters must be fully-defined at compile time, even if those types have runtime polymorphic characteristics of their own. Runtime polymorphism applies to virtual methods and function pointers, both of which can be used to dynamically alter the execution path of your program. Virtual methods are made possible through virtual tables, which are essentially just arrays of function pointers. Each runtime type that derives from a base class with virtual methods provides its own virtual table, thus the runtime type determines which specific function overrides will be invoked at runtime, even if the runtime type cannot be determined at compile time. In this way you can generalise your code to work with the base type but still get the expected polymorphic behaviour whenever a derived type is passed instead.

dynamic method dispatch is a technique by which a call to a overridden method is solved at runtime rather than compile time..this is how java implements runtime polymorphism.

Late binding and dynamic binding are related to runtime polymorphism. By contrast, compile time polymorphism is known as static binding. Template functions and classes are examples of static binding because the exact type can be determined at compile time.

There are two types of polymorphism: static and dynamic. Static polymorphism applies to templates (both functions and classes), where the compiler generates the specific function or class according to the types you use with the template. Dynamic polymorphism is achieved at runtime through virtual functions. This ensures that the most derived implementation of a function is called regardless of which base class interface is used to invoke the function.

Implicit Parametric PolymorphismSubtype PolymorphismExplicit Parametric Polymorphism

In computer science, polymorphism refers to a computer language's ability to process objects according to their data type. Dynamic binding on the other hand, is a mechanism wherein the method used on an object is being looked up by name at runtime.

Polymorphism in VC++ is the same as polymorphism in C++ itself. When you implicitly call a virtual method of a base class or one of its derivatives, then you rightly expect the most-derived override to execute instead, even when the runtime type is completely unknown to the caller and cannot be determined at runtime let alone compile time. You get that for free simply by overriding the known virtual methods of the base class, and without any need for expensive runtime type information, which is only useful if the caller is actually aware of the type in the first place, and which can only be predicted on a closed system. The whole point of polymorphism is that the base class (and therefore the caller) need know nothing whatsoever about any of its derivatives in order to execute more specialised methods. VC++ fully supports this aspect of OOP.

polymorphism in coelentrates

Virtual functions are used to suport runtime polymorphism.In C++,if we have inheritance and we have overridden functions in the inherited classes,we can declare a base class pointer and make it to point to the objects of derived classes.When we give a keyword virtual to the base class functions,the compiler will no do static binding,so during runtime ,the base class pointer can be used to call the functions of the derived classes.Thus virtual functions support dynamic polymorphism.

does polymorphism is a characteristics feature of coelentrates

run time ,, compile time polymorphism

Yes. Overloading is a form of polymorphism

The runtime broker is a process of Microsoft that helps manage app permissions and ensures apps are behaving themselves and also run in the background.

yes they exhibit polymorphism.. they have zooids and hydroids

Yes. Method Overloading is a form of Polymorphism

Operator overloading simply means to provide a new implementation for an existing operator. Polymorphism is a function of inheritance whereby it is not necessary to know the runtime type of an object so long as you know the generic type. The virtual table ensures you gain specific behaviour by calling the generic type's virtual methods.

Runtime polymorphism is required because accessing the runtime type of an object is expensive. And yes, inheritance is required for it because polymorphism is enabled through virtual functions. It is not the programmer's responsibility to determine the runtime type of an object because that information should be provided by the object's own virtual table. Thus when you implicitly invoke a virtual method of the base class, you rightly expect most-derived method to be executed, even when you cannot know in advance the exact type of the derivative -- all you know is that it is a type of base class. And that's all you need for polymorphism to work. If you ever find yourself having to turn on the runtime type of an object in order to invoke one of its methods, then you need to seriously consider redesigning your classes. How can your code possibly cope with a runtime type it has no knowledge of, such as a derived object of a class created by a third-party? In those instances you would have no way of knowing what specific methods were available. But with virtual methods there is no need to know. You simply invoke the generic virtual methods of your base class and you automatically get specific behaviour; all your derivatives do whatever they've been implemented to do, whether it is to invoke the base class method explicitly, or provide an override, or indeed both!

Runtime polymorphism is the means by which we can write generic code that invokes specific behaviour without the need to employ expensive runtime type information. That is, if we design several classes that share common features, we can percolate that shared functionality up to a common base class and work with those generic classes rather than the more specific classes. By declaring all the common functionality as virtual methods of the base class, and implementing the more specific methods in the derived class overrides, the virtual table then handles runtime type information, rather than relying on the programmer to "do the right thing".

I think constructor overloading is the concept of polymorphism.

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