base class constructor are called before derived class construtors.
Base* pBase = new Derived(); statement creates a derived class
object hence calls derived class condstructor, which calls base call
constructor. base class constructor calls fun() which prints " Base
Function".
pls correct me if i m wrong
On Mon, Aug 1, 2011 at 9:37 AM, sivaviknesh s <sivavikne...@gmail.com>wrote:
>
> #include<iostream>
> #include<stdio.h>
>
> using namespace std;
>
> class Base
> {
> public:
> Base()
> {
> fun(); //note: fun() is virtual
> }
> virtual void fun()
> {
> cout<<"\nBase Function";
> }
> };
>
> class Derived: public Base
> {
> public:
> Derived(){}
> virtual void fun()
> {
> cout<<"\nDerived Function";
> }
> };
>
> int main()
> {
> Base* pBase = new Derived();
> delete pBase;
>
> getchar();
> return 0;
> }
>
> Output:
> *Base Function*
>
> See following excerpt from C++
> standard<http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1905.pdf>for
> explanation.
>
> *When a virtual function is called directly or indirectly from a
> constructor (including from the mem-initializer for a data member) or from a
> destructor, and the object to which the call applies is the object under
> construction or destruction, the function called is the one defined in the
> constructor or destructor’s own class or in one of its bases, but not a
> function overriding it in a class derived from the constructor or
> destructor’s class, or overriding it in one of the other base classes of the
> most derived object.*
>
> Because of this difference in behavior, it is recommended that object’s
> virtual function is not invoked while it is being constructed or destroyed.
> See this
> <https://www.securecoding.cert.org/confluence/display/cplusplus/OOP30-CPP.+Do+not+invoke+virtual+functions+from+constructors+or+destructors>for
> more details.
> ..............CAN ANYONE GIVE A SIMPLE EXPLANANTION?? given explanation is
> quite confusing....
>
> --
> Regards,
> $iva
>
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