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 <coder.du...@gmail.com> 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 <muthura...@gmail.com> 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
>> <sandeep6...@gmail.com>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 <
>>> pandharinath.go...@gmail.com> 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
>>>> <sandeep6...@gmail.com>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 <
>>>>> ankit.mingl...@gmail.com> 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 <
>>>>>> aditi.garg.6...@gmail.com> wrote:
>>>>>>
>>>>>>> @ Ankit: Wat is overriding actually thn?
>>>>>>>
>>>>>>>
>>>>>>> On Sun, Jul 31, 2011 at 9:58 PM, Anika Jain
>>>>>>> <anika.jai...@gmail.com>wrote:
>>>>>>>
>>>>>>>> ohkk.. m so sorry
>>>>>>>>
>>>>>>>>
>>>>>>>> On Sun, Jul 31, 2011 at 9:41 PM, Ankit Minglani <
>>>>>>>> ankit.mingl...@gmail.com> 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 <
>>>>>>>>> anika.jai...@gmail.com> 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
>>>>>>>>>> <muthura...@gmail.com>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 <
>>>>>>>>>>> anika.jai...@gmail.com> 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 <
>>>>>>>>>>>> muthura...@gmail.com> 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 <
>>>>>>>>>>>>> himanshukansal...@gmail.com> 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 <
>>>>>>>>>>>>>> muthura...@gmail.com> 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 <
>>>>>>>>>>>>>>> himanshukansal...@gmail.com> 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 <
>>>>>>>>>>>>>>>> himanshukansal...@gmail.com> 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)
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> --
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>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
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>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> --
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Regards
>>>>>>>>>>>>>> Himanshu Kansal
>>>>>>>>>>>>>> Msc Comp. sc.
>>>>>>>>>>>>>> (University of Delhi)
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> --
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>>>>>>>>>>>>>>
>>>>>>>>>>>>>
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>>>>>>>>>> --
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>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> The more you sweat in the field, the less you bleed in war."
>>>>>>>>>
>>>>>>>>> Ankit Minglani
>>>>>>>>> NITK Surathkal
>>>>>>>>>
>>>>>>>>> --
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>>>>>>>>>
>>>>>>>>
>>>>>>>> --
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>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> Aditi Garg
>>>>>>> Undergraduate Student
>>>>>>> Electronics & Communication Divison
>>>>>>> NETAJI SUBHAS INSTITUTE OF TECHNOLOGY
>>>>>>> Sector 3, Dwarka
>>>>>>> New Delhi
>>>>>>>
>>>>>>>
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>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> The more you sweat in the field, the less you bleed in war."
>>>>>>
>>>>>> Ankit Minglani
>>>>>> NITK Surathkal
>>>>>>
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>>>>>
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>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Pandharinath Gorde
>>>> +91-9620557641
>>>>
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