@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
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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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