not sure about cpp, but in Java it is so... Every derived class
constructor's first line automatically has a call to super()...
Aug 2, 2011 at 2:05 PM, siva viknesh <[email protected]> wrote:
> how it ll simply call the base class constructor ???
>
> As far as i know .....
>
> if we give like.....
>
> class abc
> {
> abc(int i){.........}
> }
> class def : public abc
> {
>
> def(int i,int j):abc(i)
>
> {........}
>
> // by using like this only u can call base class
> //constructor no ??? ..correct me if i m wrong
>
>
> }
>
> On Aug 1, 11:04 pm, coder dumca <[email protected]> wrote:
> > 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 <[email protected]
> >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-..
> .>for
> > > more details.
> > > ..............CAN ANYONE GIVE A SIMPLE EXPLANANTION?? given explanation
> is
> > > quite confusing....
> >
> > > --
> > > Regards,
> > > $iva
> >
> > > --
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--
Regards,
Deepthi
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