It gives this error:
error: prototype for ‘int B::speed()’ does not match any in class ‘B’.
Should I include this in class B(in B.h)
class B:public A
{
public:
virtual int speed(); //wouldn't this override the speed() from A ?
private:
int m_speed();
}
class A (in A.h)is defined as this
class A
{
public:
virtual int speed();
}
Another Question:
If I want to use speed() from class B via an object of class A, how can I do
this ?
(in a third file which has: #include<A.h>) or is there a better way to do
this ?
On 13 June 2010 12:54, Rohit Saraf <rohit.kumar.sa...@gmail.com> wrote:
> yes.. it should... make sure your virtual function is either public or
> protected but not private.
> and if it doesn't can u tell me the error?
> --------------------------------------------------
> Rohit Saraf
> Second Year Undergraduate,
> Dept. of Computer Science and Engineering
> IIT Bombay
> http://www.cse.iitb.ac.in/~rohitfeb14
>
>
> On Sun, Jun 13, 2010 at 12:47 PM, akshay khatri <akshaykhatri...@gmail.com
> > wrote:
>
>> I meant this:
>> let me explain it like this.
>> I have *virtual int speed()* in class A.(in file A.h)
>> I inherited class in class B(in file B.h) as class B:public A
>> class B have a private member m_speed.
>> Now I have to return m_speed from speed() from class B as I would
>> instantiate an object of class B to use it.
>> So if write my prgram like this:
>>
>> class B:public A
>> {
>> private:
>> int m_speed();
>> }
>>
>> int B::speed()
>> {
>> return m_speed;
>> }
>>
>> would it work ?
>>
>>
>>
>> On 13 June 2010 12:37, Rohit Saraf <rohit.kumar.sa...@gmail.com> wrote:
>>
>>> Make those functions public
>>> And even if M_speed is public of another class, it is still it another
>>> class, you cannot just address it like m_speed in other classes.
>>> Does it help?
>>>
>>> --------------------------------------------------
>>> Rohit Saraf
>>> Second Year Undergraduate,
>>> Dept. of Computer Science and Engineering
>>> IIT Bombay
>>> http://www.cse.iitb.ac.in/~rohitfeb14
>>>
>>>
>>> On Sun, Jun 13, 2010 at 12:31 PM, akshay khatri <
>>> akshaykhatri...@gmail.com> wrote:
>>>
>>>> Hi
>>>>
>>>> On 13 June 2010 12:26, Rohit Saraf <rohit.kumar.sa...@gmail.com> wrote:
>>>>
>>>>> M-speed is private and you cannot call it from outside myPlugin.
>>>>> (though i did not understand what u wanted to say)
>>>>> Can you write ur prob explicitly?
>>>>>
>>>>
>>>> I want to use speed() and direction() defined in myPlugin.h in
>>>> otherPlugin.cpp. How can I use it(syntax) ? If I try to return a variable
>>>> such as m_speed(even if defined in public part of class otherPlugin) , it
>>>> gives an error.
>>>>
>>>>
>>>>
>>>>> --------------------------------------------------
>>>>> Rohit Saraf
>>>>> Second Year Undergraduate,
>>>>> Dept. of Computer Science and Engineering
>>>>> IIT Bombay
>>>>> http://www.cse.iitb.ac.in/~rohitfeb14
>>>>>
>>>>>
>>>>>
>>>>> On Sun, Jun 13, 2010 at 12:20 PM, akshay khatri <
>>>>> akshaykhatri...@gmail.com> wrote:
>>>>>
>>>>>> I have the following code structure
>>>>>> in my file myPlugin.h , i have defined this
>>>>>>
>>>>>> virtual int speed();
>>>>>>
>>>>>> and gave a dummy implementation in myPlugin.cpp
>>>>>>
>>>>>> In another file otherPlugin.h I have included this line:
>>>>>>
>>>>>> #include <myPlugin.h>
>>>>>> private:
>>>>>> int m_speed;
>>>>>>
>>>>>> also class otherPlugin inherits myPlugin (public scope)
>>>>>> I want to redefine speed in otherPlugin.cpp
>>>>>> How should I return a value fromspeed() in it ?
>>>>>>
>>>>>> int myPlugin::speed()
>>>>>> {
>>>>>> return m_speed;
>>>>>> }
>>>>>> or
>>>>>> int otherPlugin::speed()
>>>>>> {
>>>>>> return m_speed;
>>>>>> }
>>>>>>
>>>>>> or anything else ?
>>>>>>
>>>>>> The error I get is that: m_speed was not declared in this scope.
>>>>>>
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