C++ : Base class member function not accessible from derived class


 
Thread Tools Search this Thread
Top Forums Programming C++ : Base class member function not accessible from derived class
# 1  
Old 07-22-2014
C++ : Base class member function not accessible from derived class

Hello All,
I am a learner in C++. I was testing my inheritance knowledge with following piece of code.

Code:
#include <iostream>

using namespace std;

class base
{
	public :
		void display()
		{
			cout << "In base display()" << endl;
		}
		void display(int k)
		{
			cout << "In base display(int k)" << endl;
		}
};

class derived : public base
{
	public :
		void display()
		{
			cout << "In derive display()" << endl;
		}
};

int main()
{
	derived der;	
	der.display(50);
}


As far as I know it should compile without giving any error. But that is not the case as it is giving compilation error saying :-

Code:
StaticMember_1.cpp: In function ‘int main()':
StaticMember_1.cpp:30: error: no matching function for call to ‘derived::display(int)'
StaticMember_1.cpp:21: note: candidates are: void derived::display()

Can you guys help me out in finding why its giving error. there must be some concept here which I am missing.
Thanks in advance all of you.

Regards,
Anand Shah
# 2  
Old 07-22-2014
When you declaredisplay() in the derived class, it hides the base class display() instead of overloading it. So when you call the display() using a derived class object, you will get an error since the compiler is unable to find the correct function.

Refer C++ FAQ for more info.
This User Gave Thanks to chacko193 For This Post:
# 3  
Old 07-22-2014
Thank you Chacko193 for your efforts. I understood it completely. I always felt there is some catch in it which I was missing. Thanks again.
Login or Register to Ask a Question

Previous Thread | Next Thread

9 More Discussions You Might Find Interesting

1. Programming

Size of derived class, in case of multiple inheritance

Why, here the size of class 'Derived' is 8 ? class Base1 { public: virtual void f() { } }; class Base2 { public: virtual void f() { } }; class Derived : public Base1, Base2 { public: virtual void f() { } }; (1 Reply)
Discussion started by: techmonk
1 Replies

2. Programming

Restricting member of a class non-inheritable in C++

There is base class B, and two derived classes D1 and D2 derived from Base. Base class B, have two data members ( public or protected or private or if any). D1 should inherit both these data members, and D2 should be deriving only one member from Base class. Is this kind of design possible without... (1 Reply)
Discussion started by: techmonk
1 Replies

3. Programming

Size of Derived class, upon virtual base class inheritance

I have the two class definition as follows. class A { public: int a; }; class B : virtual public A{ }; The size of class A is shown as 4, and size of class B is shown as 16. Why is this effect ?. (2 Replies)
Discussion started by: techmonk
2 Replies

4. UNIX for Advanced & Expert Users

Get pointer for existing device class (struct class) in Linux kernel module

Hi all! I am trying to register a device in an existing device class, but I am having trouble getting the pointer to an existing class. I can create a class in a module, get the pointer to it and then use it to register the device with: *cl = class_create(THIS_MODULE, className);... (0 Replies)
Discussion started by: hdaniel@ualg.pt
0 Replies

5. Programming

Writing C++ class and member functions

I have the following class and thought that when I call the set command to set a member, I always use value. Would that be fine? class ModMisfit { protected: Real dtau; Real mdacc; Real mindist; bool hw; Source** src; public: void ... (7 Replies)
Discussion started by: kristinu
7 Replies

6. Programming

Base class's variables not accessible????

Hi friends, The derived class cannot access the base class's variables in my program. You can have a look at my code, I am actually using class templates. #include <iostream> using namespace std; template <class T> class Sum { friend void Check(Sum &s, T a, T b) { T x,... (2 Replies)
Discussion started by: gabam
2 Replies

7. Programming

C++ class definition with a member of the same class

Hi, i have a question about C++. Is it possible to declare a class with a member ot the same class? For example, a linked list or i want to convert this C code to C++ class (Elemento) typedef struct elemento { char name; char value; List<struct elemento> ltElementos; ... (7 Replies)
Discussion started by: pogdorica
7 Replies

8. Programming

Handling a signal with a class member function

Hello, i am using the sigaction function to handle the SIGCHLD signal.Is it possible to use a class member function as the handler function (the sa_handler member of the sigaction structure)? The function's signature is: void (*sa_handler)(int);so i don't think i can use a static member function... (2 Replies)
Discussion started by: Zipi
2 Replies

9. Programming

How to make a function friend to both base and derived class

Hi, I have a base class and derived a class from the base class, i want to print & read the data for the object created for the derived class,so i have overloaded both the << and >> operators and also have done the foward declaration. Below is the code snippet, #include <iostream> class... (3 Replies)
Discussion started by: ennstate
3 Replies
Login or Register to Ask a Question

Featured Tech Videos