@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)
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> --
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>>>>>>>>>>>>>>>>> Google Groups "Algorithm Geeks" group.
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>>>>>>>>>>>>>>>>> [email protected].
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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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>>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> --
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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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>>>>>
>>>>
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>>>
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>>
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>
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--
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