Diffrence between static binding and dynamic bindig?

in c++ programming language

Diffrence between static binding and dynamic bindig?
Dynamic Versus Static Binding


Not every call of a virtual function is resolved dynamically. In fact, in many cases the compiler resolves the call statically, even if the function is declared virtual. For example:





class A


{


public:


virtual void func() {/*..*/}


};


int main()


{


A a;


A.func(); // resolved at compile time


}





Dynamic binding applies in two cases: when calling a virtual function through a pointer to a polymorphic object, and when calling a virtual function through a reference to a polymorphic object (a polymorphic object is one that declares or inherits at least one virtual member function). For example.:





void f(A %26amp; ref, A* pa)


{


ref.func(); // resolved dynamically


pa-%26gt;func(); // resolved dynamically


}





int main()


{


A a;


f(a, %26amp;a);


}





You can bypass the dynamic binding mechanism by using explicit qualification with the scope operator:





pa-%26gt;A::func(); // resolved statically





With Regards,


K.SivaKumar.


http://www.indianbabycare.com


http://www.tamilmasala.net
Reply:static binding: it means that class objects are binded/initialized at compile time. this implies that compiler has all the information about the type of the object.





dynamic binding: it means that class objects are binded/initialized at runtime, and compiler doesnt have any info. about the type of object.
Reply:static binding does not change. dynamic binding does.
Reply:stating binding is done at the compilation time and it canot change while the run time,


the Dynamic one can change it while the run time,


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