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What Is The Use of VirtualDestructer?   Contact Author

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Virtual destructor is used for the polymorphic decomposition of allocated resources.  Posted by: Vishal Singh       Contact Author in the case of multiple inheritance same member function in both and derived class exist then the two copies of childs will be created. so there is an ambiguity between which function to execute so virtual functions are introduced.we can accept the derived and based class methods with help of pointers.if pointer points to base method then base method will be executed.if it points to derive then derive will be executed so in order to delete these pointers we go for virtual desstructors  Posted by: krishna       Contact Author virtual destructer is used so that while deleting the pointer to base class but pointing to base class invokes the derived class destructor first,then the base class destruct hence preventing memory leak...  Posted by: praveen       Contact Author First pls get clear with virtual function conceptss... suppose we have a class hierachy Empl-->Manager-->CEO now we are creating Empl* e1; CEO c1; e1= & c1; Now when ever my e1 goes out of scope because e1 is of type Empl only the destructor of e1 is called & memory is freed for attributes of e1 only. ? for Manager & CEO attributes so we have the memory leakage problem so if we are making Destructor as a virtual so exceutin of destructor will follow ~CEO-->~Manager-->~Empl path so Memory for all the data is freed..... so to avoid these Memory Leakage problem we have to make destructor as a virtual destructor..... Now if u have understood the explanation pls tell me Can we have virtual constructor???  Posted by: Mihir P Trivedi       Contact Author virtual destructors are used to deallocate the memory in prper order if the memory is allocated through new for example base *p; p=new derive; firstly the base class constructor would be called followd by the derive class if we now say delete p then destruction should proceed from derive to base. this can be ensured by declaring base class destructor virual  Posted by: Rohit Adhlakha       Contact Author © CoolInterview.com Today's Special: Get Free Magazine from SAP now! A D V E R T I S E M E N T

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Category	C++ Interview Questions
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