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In C++, what is the usefulness of Virtual destructors?

April 26, 2017destructors usefulness virtual

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In C++, what is the usefulness of Virtual destructors?

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Virtual destructors are neccessary to reclaim memory that were allocated for objects in the class hierarchy. If a pointer to a base class object is deleted, then the compiler guarantees the various subclass destructors are called in reverse order of the object construction chain.