@ atul anand:
Because Prem Krishna Chettri's question was for main function that was as
below:
int main() {
baseClass *aPtr = new derivedClass1();
baseClass *bPtr = new derivedClass2();
delete aPtr;
delete bPtr;
}
Here, there are two derived objects aPtr and bPtr, so the base class
destructor is called twice here.
On Thu, Dec 8, 2011 at 4:57 PM, ashok dhakar <dhakar.as...@gmail.com> wrote:
> class baseClass { public : ~baseClass() { cout<< "baseClass Des
> called"<< endl; } };
> ....
> int main()
> {
> baseClass *bPtr = new derivedClass2();
> delete bPtr;
> }
> This will print :"baseClass Des called"
> Reason:
> The baseClass is a simple class there is no virtual destructor for
> it,so whenever we create the object of classes derived from baseClass
> there will be memory leak for the Derived Object.
> There is no way for the compiler to interpret differently the
> destructor function..so it calls baseClass destructor functions only.
> If we make it virtual Destructor then this will be determined at run
> time through the v-table based on its object type and derived
> destructor will be executed 1st then base destructor.
>
>
> In the below case:
> /*Derived class*/
> class derivedClass1 : public baseClass {
> public:
> virtual ~derivedClass1() {cout <<"derivedClass1 Des called"<<
> endl;}
>
> };
> class derivedClassOf1 : public derivedClass1{
> public:
> virtual ~derivedClassOf1() {cout <<"derivedClassOf1 Des called"<<
> endl;}
> };
>
> Now derivedClass1 has virtual destructor so all the derived objects
> of this class will not have any memory leak provided if
> derivedClass1 *pdC1=new derivedClassOf1 ();
> delete pdC1;
> This will 1st call derivedClassOf1,then derivedClass1 and also the
> base class(remember deletion via derived pointer will make sure the
> base destructor will be called,virtual was added to solve the problem
> of memory leak while deletion from base pointers)
>
>
> baseClass *p=new derivedClassOf1 ();
> This will have memory leak as it will call only the base class
> destructor.
>
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--
Thanks,
Amit Kumar Basak
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