and one more thing B is containg A's object inside which conatin noramlly vptr if any virtual fun in A otherwise data member of it So A::Func() and *B::func() * are diifent u require to access A's func() by A::func() in B. chk it by coding also and debugging
On Sun, Jul 31, 2011 at 11:46 PM, pandharinath gorde < [email protected]> wrote: > @sandeep > @sandeep > class A > { > public: > void func(){ /* A'simplementation */} > }; > > class B:public A > { > public: > void func(){/* B's implementation*/ } > }; > > > > whatever is happening in this one is not overriding and not overloading > For overloading function should be is same scope but see below both func > are in different scope > void A::func(); > void B::func(); > > For fun overriding vptr table is used for entry in vptr table, for entry in > vptr table function should be virtual. > > > On Sun, Jul 31, 2011 at 11:42 PM, Amol Sharma <[email protected]>wrote: > >> ok...i agree with the explanation given by sandeep regarding >> overloading,overriding and virtual fns. >> >> but i am not able to think if there exist any method to do the required >> task !! >> -- >> >> >> Amol Sharma >> Third Year Student >> Computer Science and Engineering >> MNNIT Allahabad >> >> >> >> >> On Sun, Jul 31, 2011 at 10:59 PM, coder dumca <[email protected]>wrote: >> >>> @ muthuraj >>> see here display in derived is overriding display() in base and also has >>> purpose >>> class A >>> { >>> int a; >>> public : >>> void dispaly() >>> { >>> cout<<a; >>> } >>> }; >>> >>> class B:public A >>> { >>> int b; >>> public : >>> void display() >>> { >>> A::dispaly(); >>> cout<<b; >>> } >>> }; >>> >>> On Sun, Jul 31, 2011 at 10:25 AM, muthu raj <[email protected]>wrote: >>> >>>> Function overriding gains significance only when functions are declared >>>> virtual. Otherwise Overriding does not serve any purpose. the main idea >>>> behind virtual functions and method overloading is to implement Dynamic >>>> Polymorphism i.e decide which version of function(base or derived) to be >>>> invoked during runtime. >>>> >>>> *Muthuraj R >>>> IV th Year , ISE >>>> PESIT , Bangalore* >>>> >>>> >>>> >>>> On Sun, Jul 31, 2011 at 10:22 AM, Sandeep Jain <[email protected] >>>> > wrote: >>>> >>>>> @Pandharinath: Please consider the following e.g. >>>>> class A >>>>> { >>>>> public: >>>>> void func(){ /* A'simplementation */} >>>>> }; >>>>> >>>>> class B:public A >>>>> { >>>>> public: >>>>> void func(){/* B's implementation*/ } >>>>> }; >>>>> >>>>> What is B's func() doing? >>>>> >>>>> >>>>> >>>>> >>>>> Regards, >>>>> Sandeep Jain >>>>> >>>>> >>>>> >>>>> >>>>> On Sun, Jul 31, 2011 at 10:36 PM, pandharinath gorde < >>>>> [email protected]> wrote: >>>>> >>>>>> >>>>>> sandeep ur misguiding all things are,. >>>>>> >>>>>> for overriding virtual keyword is used that means virtual functions >>>>>> only overriden. >>>>>> In c++ u require to add virtual keyword. >>>>>> and in java every non static function is by default virtual. >>>>>> >>>>>> >>>>>> >>>>>> On Sun, Jul 31, 2011 at 10:23 PM, Sandeep Jain <[email protected] >>>>>> > wrote: >>>>>> >>>>>>> Overridden functions and virtual functions are two different >>>>>>> concepts... >>>>>>> 1) Two functions in the same scope having same but different >>>>>>> signatures = Over Loading >>>>>>> 2) Two functions having same signatures but one defined in parent >>>>>>> class and the other defined in child class == Overriding >>>>>>> 3) Virtual functions, allow for run time polymorphism among >>>>>>> overridden functions.(only when invoked using pointer) >>>>>>> >>>>>>> btw I'm still trying to think if preventing function over-riding is >>>>>>> possible... >>>>>>> >>>>>>> >>>>>>> Regards, >>>>>>> Sandeep Jain >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> On Sun, Jul 31, 2011 at 10:13 PM, Ankit Minglani < >>>>>>> [email protected]> wrote: >>>>>>> >>>>>>>> @aditi : in C++ you define a function virtual to let the derived >>>>>>>> class give its own definition for the same. and in that case the >>>>>>>> functions >>>>>>>> are overridden. unlike in JAVA where no virtual keyword is needed .. >>>>>>>> so if >>>>>>>> you write the same code as above in java .. that may be referred to as >>>>>>>> Method overriding .. but not in cpp. >>>>>>>> >>>>>>>> >>>>>>>> On Sun, Jul 31, 2011 at 9:34 AM, aditi garg < >>>>>>>> [email protected]> wrote: >>>>>>>> >>>>>>>>> @ Ankit: Wat is overriding actually thn? >>>>>>>>> >>>>>>>>> >>>>>>>>> On Sun, Jul 31, 2011 at 9:58 PM, Anika Jain < >>>>>>>>> [email protected]> wrote: >>>>>>>>> >>>>>>>>>> ohkk.. m so sorry >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> On Sun, Jul 31, 2011 at 9:41 PM, Ankit Minglani < >>>>>>>>>> [email protected]> wrote: >>>>>>>>>> >>>>>>>>>>> @anika: This is not function overriding i think .. you cannot >>>>>>>>>>> call the f() function of the base class from the derived class >>>>>>>>>>> object .. >>>>>>>>>>> what you are doing is creating a object of the derived class and >>>>>>>>>>> calling the >>>>>>>>>>> version of f() that belong to derived class B .. ie is the same >>>>>>>>>>> class object >>>>>>>>>>> is calling the same class function . >>>>>>>>>>> >>>>>>>>>>> correct me if i m wrong . >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> On Sun, Jul 31, 2011 at 8:42 AM, Anika Jain < >>>>>>>>>>> [email protected]> wrote: >>>>>>>>>>> >>>>>>>>>>>> @ muthu : not declaring tht function as virtual wont save >>>>>>>>>>>> overriding >>>>>>>>>>>> >>>>>>>>>>>> class A >>>>>>>>>>>> { >>>>>>>>>>>> int a; >>>>>>>>>>>> >>>>>>>>>>>> public: >>>>>>>>>>>> void f() >>>>>>>>>>>> {} >>>>>>>>>>>> int f2(){} >>>>>>>>>>>> }; >>>>>>>>>>>> >>>>>>>>>>>> class B:public A >>>>>>>>>>>> { >>>>>>>>>>>> public: >>>>>>>>>>>> void f() >>>>>>>>>>>> { >>>>>>>>>>>> cout<<"abc\n"; >>>>>>>>>>>> } >>>>>>>>>>>> }; >>>>>>>>>>>> >>>>>>>>>>>> int main() >>>>>>>>>>>> { >>>>>>>>>>>> B ob; >>>>>>>>>>>> ob.f(); >>>>>>>>>>>> return 0; >>>>>>>>>>>> } >>>>>>>>>>>> >>>>>>>>>>>> in this output is abc.. >>>>>>>>>>>> so overriding occured >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> On Sun, Jul 31, 2011 at 8:41 PM, muthu raj < >>>>>>>>>>>> [email protected]> wrote: >>>>>>>>>>>> >>>>>>>>>>>>> Using friend functions we can only invoke already defined >>>>>>>>>>>>> private functions. We cannot override or prevent overriding using >>>>>>>>>>>>> friend >>>>>>>>>>>>> functions. The problem here is how to prevent base class function >>>>>>>>>>>>> from being >>>>>>>>>>>>> overridden in derived class. >>>>>>>>>>>>> >>>>>>>>>>>>> *Muthuraj R >>>>>>>>>>>>> IV th Year , ISE >>>>>>>>>>>>> PESIT , Bangalore* >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> On Sun, Jul 31, 2011 at 8:04 AM, Anika Jain < >>>>>>>>>>>>> [email protected]> wrote: >>>>>>>>>>>>> >>>>>>>>>>>>>> what if we write that function as private of base class.. and >>>>>>>>>>>>>> make a function in derived class that is friend function of the >>>>>>>>>>>>>> base class >>>>>>>>>>>>>> do that it can call tht private function of base.?? >>>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>> On Sun, Jul 31, 2011 at 8:25 PM, muthu raj < >>>>>>>>>>>>>> [email protected]> wrote: >>>>>>>>>>>>>> >>>>>>>>>>>>>>> Yeah but there is no equivalent of final keyword in >>>>>>>>>>>>>>> c++.....So to prevent member function from overriding in >>>>>>>>>>>>>>> derived class in >>>>>>>>>>>>>>> c++ dont declare the member function as virtual. Then it cannot >>>>>>>>>>>>>>> be >>>>>>>>>>>>>>> overridden in derived class. There is no other way of >>>>>>>>>>>>>>> preventing a member >>>>>>>>>>>>>>> function of base class from being overridden. >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> *Muthuraj R >>>>>>>>>>>>>>> IV th Year , ISE >>>>>>>>>>>>>>> PESIT , Bangalore* >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> On Sun, Jul 31, 2011 at 7:38 AM, himanshu kansal < >>>>>>>>>>>>>>> [email protected]> wrote: >>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> i think there is no keyword known as final in c++.....maybe >>>>>>>>>>>>>>>> u are talking with respect to java.... >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> On Sun, Jul 31, 2011 at 8:03 PM, muthu raj < >>>>>>>>>>>>>>>> [email protected]> wrote: >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> By declaring the function a static final f()..... >>>>>>>>>>>>>>>>> *Muthuraj R >>>>>>>>>>>>>>>>> IV th Year , ISE >>>>>>>>>>>>>>>>> PESIT , Bangalore* >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> On Sun, Jul 31, 2011 at 7:28 AM, himanshu kansal < >>>>>>>>>>>>>>>>> [email protected]> wrote: >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> sry i think....i misspelled d ques.... >>>>>>>>>>>>>>>>>> d ques was.... >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> how will you protect a derived class to override base >>>>>>>>>>>>>>>>>> class's member function in c++.... >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> say if there is a function f() in base class then derived >>>>>>>>>>>>>>>>>> should not be able to >>>>>>>>>>>>>>>>>> override f() to provide its own definition..... >>>>>>>>>>>>>>>>>> but The function must be accessible in derived class. >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> PS:dont try to make the function private in base class( it >>>>>>>>>>>>>>>>>> will be >>>>>>>>>>>>>>>>>> become inaccessible in derived class). >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> On Sun, Jul 31, 2011 at 7:49 PM, himanshu kansal < >>>>>>>>>>>>>>>>>> [email protected]> wrote: >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>> how will you protect a base class to override its member >>>>>>>>>>>>>>>>>>> function in >>>>>>>>>>>>>>>>>>> derived class.... >>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>> say if there is a function f() in base class then derived >>>>>>>>>>>>>>>>>>> cannot >>>>>>>>>>>>>>>>>>> override f() to provide its own definition..... >>>>>>>>>>>>>>>>>>> The function must be accessible in derived class. >>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>> PS:dont try to make the function private in base class( >>>>>>>>>>>>>>>>>>> it will be >>>>>>>>>>>>>>>>>>> become inaccessible in derived class). >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> -- >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> Regards >>>>>>>>>>>>>>>>>> Himanshu Kansal >>>>>>>>>>>>>>>>>> Msc Comp. sc. >>>>>>>>>>>>>>>>>> (University of Delhi) >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>> -- >>>>>>>>>>>>>>>>>> You received this message because you are subscribed to >>>>>>>>>>>>>>>>>> the Google Groups "Algorithm Geeks" group. >>>>>>>>>>>>>>>>>> To post to this group, send email to >>>>>>>>>>>>>>>>>> [email protected]. >>>>>>>>>>>>>>>>>> To unsubscribe from this group, send email to >>>>>>>>>>>>>>>>>> [email protected]. >>>>>>>>>>>>>>>>>> For more options, visit this group at >>>>>>>>>>>>>>>>>> http://groups.google.com/group/algogeeks?hl=en. >>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> -- >>>>>>>>>>>>>>>>> You received this message because you are subscribed to the >>>>>>>>>>>>>>>>> Google Groups "Algorithm Geeks" group. >>>>>>>>>>>>>>>>> To post to this group, send email to >>>>>>>>>>>>>>>>> [email protected]. >>>>>>>>>>>>>>>>> To unsubscribe from this group, send email to >>>>>>>>>>>>>>>>> [email protected]. >>>>>>>>>>>>>>>>> For more options, visit this group at >>>>>>>>>>>>>>>>> http://groups.google.com/group/algogeeks?hl=en. >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> -- >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> Regards >>>>>>>>>>>>>>>> Himanshu Kansal >>>>>>>>>>>>>>>> Msc Comp. sc. >>>>>>>>>>>>>>>> (University of Delhi) >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> -- >>>>>>>>>>>>>>>> You received this message because you are subscribed to the >>>>>>>>>>>>>>>> Google Groups "Algorithm Geeks" group. >>>>>>>>>>>>>>>> To post to this group, send email to >>>>>>>>>>>>>>>> [email protected]. >>>>>>>>>>>>>>>> To unsubscribe from this group, send email to >>>>>>>>>>>>>>>> [email protected]. >>>>>>>>>>>>>>>> For more options, visit this group at >>>>>>>>>>>>>>>> http://groups.google.com/group/algogeeks?hl=en. >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> -- >>>>>>>>>>>>>>> You received this message because you are subscribed to the >>>>>>>>>>>>>>> Google Groups "Algorithm Geeks" group. >>>>>>>>>>>>>>> To post to this group, send email to >>>>>>>>>>>>>>> [email protected]. >>>>>>>>>>>>>>> To unsubscribe from this group, send email to >>>>>>>>>>>>>>> [email protected]. >>>>>>>>>>>>>>> For more options, visit this group at >>>>>>>>>>>>>>> http://groups.google.com/group/algogeeks?hl=en. >>>>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>> -- >>>>>>>>>>>>>> You received this message because you are subscribed to the >>>>>>>>>>>>>> Google Groups "Algorithm Geeks" group. >>>>>>>>>>>>>> To post to this group, send email to >>>>>>>>>>>>>> [email protected]. >>>>>>>>>>>>>> To unsubscribe from this group, send email to >>>>>>>>>>>>>> [email protected]. >>>>>>>>>>>>>> For more options, visit this group at >>>>>>>>>>>>>> http://groups.google.com/group/algogeeks?hl=en. >>>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> -- >>>>>>>>>>>>> You received this message because you are subscribed to the >>>>>>>>>>>>> Google Groups "Algorithm Geeks" group. >>>>>>>>>>>>> To post to this group, send email to >>>>>>>>>>>>> [email protected]. >>>>>>>>>>>>> To unsubscribe from this group, send email to >>>>>>>>>>>>> [email protected]. >>>>>>>>>>>>> For more options, visit this group at >>>>>>>>>>>>> http://groups.google.com/group/algogeeks?hl=en. >>>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> -- >>>>>>>>>>>> You received this message because you are subscribed to the >>>>>>>>>>>> Google Groups "Algorithm Geeks" group. >>>>>>>>>>>> To post to this group, send email to [email protected] >>>>>>>>>>>> . >>>>>>>>>>>> To unsubscribe from this group, send email to >>>>>>>>>>>> [email protected]. >>>>>>>>>>>> For more options, visit this group at >>>>>>>>>>>> http://groups.google.com/group/algogeeks?hl=en. >>>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> -- >>>>>>>>>>> The more you sweat in the field, the less you bleed in war." >>>>>>>>>>> >>>>>>>>>>> Ankit Minglani >>>>>>>>>>> NITK Surathkal >>>>>>>>>>> >>>>>>>>>>> -- >>>>>>>>>>> You received this message because you are subscribed to the >>>>>>>>>>> Google Groups "Algorithm Geeks" group. >>>>>>>>>>> To post to this group, send email to [email protected]. >>>>>>>>>>> To unsubscribe from this group, send email to >>>>>>>>>>> [email protected]. >>>>>>>>>>> For more options, visit this group at >>>>>>>>>>> http://groups.google.com/group/algogeeks?hl=en. >>>>>>>>>>> >>>>>>>>>> >>>>>>>>>> -- >>>>>>>>>> You received this message because you are subscribed to the Google >>>>>>>>>> Groups "Algorithm Geeks" group. >>>>>>>>>> To post to this group, send email to [email protected]. >>>>>>>>>> To unsubscribe from this group, send email to >>>>>>>>>> [email protected]. >>>>>>>>>> For more options, visit this group at >>>>>>>>>> http://groups.google.com/group/algogeeks?hl=en. >>>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> -- >>>>>>>>> Aditi Garg >>>>>>>>> Undergraduate Student >>>>>>>>> Electronics & Communication Divison >>>>>>>>> NETAJI SUBHAS INSTITUTE OF TECHNOLOGY >>>>>>>>> Sector 3, Dwarka >>>>>>>>> New Delhi >>>>>>>>> >>>>>>>>> >>>>>>>>> -- >>>>>>>>> You received this message because you are subscribed to the Google >>>>>>>>> Groups "Algorithm Geeks" group. >>>>>>>>> To post to this group, send email to [email protected]. >>>>>>>>> To unsubscribe from this group, send email to >>>>>>>>> [email protected]. >>>>>>>>> For more options, visit this group at >>>>>>>>> http://groups.google.com/group/algogeeks?hl=en. >>>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> -- >>>>>>>> The more you sweat in the field, the less you bleed in war." >>>>>>>> >>>>>>>> Ankit Minglani >>>>>>>> NITK Surathkal >>>>>>>> >>>>>>>> -- >>>>>>>> You received this message because you are subscribed to the Google >>>>>>>> Groups "Algorithm Geeks" group. >>>>>>>> To post to this group, send email to [email protected]. >>>>>>>> To unsubscribe from this group, send email to >>>>>>>> [email protected]. >>>>>>>> For more options, visit this group at >>>>>>>> http://groups.google.com/group/algogeeks?hl=en. >>>>>>>> >>>>>>> >>>>>>> -- >>>>>>> You received this message because you are subscribed to the Google >>>>>>> Groups "Algorithm Geeks" group. >>>>>>> To post to this group, send email to [email protected]. >>>>>>> To unsubscribe from this group, send email to >>>>>>> [email protected]. >>>>>>> For more options, visit this group at >>>>>>> http://groups.google.com/group/algogeeks?hl=en. >>>>>>> >>>>>> >>>>>> >>>>>> >>>>>> -- >>>>>> Pandharinath Gorde >>>>>> +91-9620557641 >>>>>> >>>>>> -- >>>>>> You received this message because you are subscribed to the Google >>>>>> Groups "Algorithm Geeks" group. >>>>>> To post to this group, send email to [email protected]. >>>>>> To unsubscribe from this group, send email to >>>>>> [email protected]. >>>>>> For more options, visit this group at >>>>>> http://groups.google.com/group/algogeeks?hl=en. >>>>>> >>>>> >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "Algorithm Geeks" group. >>>>> To post to this group, send email to [email protected]. >>>>> To unsubscribe from this group, send email to >>>>> [email protected]. >>>>> For more options, visit this group at >>>>> http://groups.google.com/group/algogeeks?hl=en. >>>>> >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Algorithm Geeks" group. >>>> To post to this group, send email to [email protected]. >>>> To unsubscribe from this group, send email to >>>> [email protected]. >>>> For more options, visit this group at >>>> http://groups.google.com/group/algogeeks?hl=en. >>>> >>> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "Algorithm Geeks" group. >>> To post to this group, send email to [email protected]. >>> To unsubscribe from this group, send email to >>> [email protected]. >>> For more options, visit this group at >>> http://groups.google.com/group/algogeeks?hl=en. >>> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Algorithm Geeks" group. >> To post to this group, send email to [email protected]. >> To unsubscribe from this group, send email to >> [email protected]. >> For more options, visit this group at >> http://groups.google.com/group/algogeeks?hl=en. >> > > > > -- > Pandharinath Gorde > +91-9620557641 > > -- Pandharinath Gorde +91-9620557641 -- You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
