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    <p>From <a href="http://www.research.att.com/~bs/bs_faq2.html#virtual-dtor" rel="noreferrer">Stroustrup's C++ Style and Technique FAQ</a>:</p> <blockquote> <p>So when should I declare a destructor virtual? Whenever the class has at least one virtual function. Having virtual functions indicate that a class is meant to act as an interface to derived classes, and when it is, an object of a derived class may be destroyed through a pointer to the base.</p> </blockquote> <p>Lots of additional info on <a href="http://www.parashift.com/c++-faq-lite/virtual-functions.html#faq-20.7" rel="noreferrer">when your destructor should be virtual on the C++ FAQ</a>. (thanks Stobor)</p> <p>What is a virtual member? From the <a href="http://www.parashift.com/c++-faq-lite/virtual-functions.html#faq-20.1" rel="noreferrer">C++ FAQ</a>:</p> <blockquote> <p>[20.1] What is a "virtual member function"?</p> <p>From an OO perspective, it is the single most important feature of C++: [6.9], [6.10].</p> <p>A virtual function allows derived classes to replace the implementation provided by the base class. The compiler makes sure the replacement is always called whenever the object in question is actually of the derived class, even if the object is accessed by a base pointer rather than a derived pointer. This allows algorithms in the base class to be replaced in the derived class, even if users don't know about the derived class.</p> <p>The derived class can either fully replace ("override") the base class member function, or the derived class can partially replace ("augment") the base class member function. The latter is accomplished by having the derived class member function call the base class member function, if desired.</p> </blockquote>
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    1. POWhen should your destructor be virtual?
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    1. COThat's not the only case, though...
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    2. CO+1 nice copy paste quote from Mr S., can't really beat that answer
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    3. COTo be precise, what about when the child class of a parent with no virtual functions defines a member which requires cleanup, but which isn't contained in the parent? The lack of a virtual destructor would mean "delete parent" would not call the child class's destructor...
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