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    copied!<p>As far I could test, it is very important to add the virtual destructor. I'm using objects created with <code>new</code> and destroyed with <code>delete</code>.</p> <p>If you do not add the virtual destructor in the interface, then the destructor of the inherited class is not called.</p> <pre><code>class IBase { public: virtual ~IBase() {}; // destructor, use it to call destructor of the inherit classes virtual void Describe() = 0; // pure virtual method }; class Tester : public IBase { public: Tester(std::string name); virtual ~Tester(); virtual void Describe(); private: std::string privatename; }; Tester::Tester(std::string name) { std::cout &lt;&lt; "Tester constructor" &lt;&lt; std::endl; this-&gt;privatename = name; } Tester::~Tester() { std::cout &lt;&lt; "Tester destructor" &lt;&lt; std::endl; } void Tester::Describe() { std::cout &lt;&lt; "I'm Tester [" &lt;&lt; this-&gt;privatename &lt;&lt; "]" &lt;&lt; std::endl; } void descriptor(IBase * obj) { obj-&gt;Describe(); } int main(int argc, char** argv) { std::cout &lt;&lt; std::endl &lt;&lt; "Tester Testing..." &lt;&lt; std::endl; Tester * obj1 = new Tester("Declared with Tester"); descriptor(obj1); delete obj1; std::cout &lt;&lt; std::endl &lt;&lt; "IBase Testing..." &lt;&lt; std::endl; IBase * obj2 = new Tester("Declared with IBase"); descriptor(obj2); delete obj2; // this is a bad usage of the object since it is created with "new" but there are no "delete" std::cout &lt;&lt; std::endl &lt;&lt; "Tester not defined..." &lt;&lt; std::endl; descriptor(new Tester("Not defined")); return 0; } </code></pre> <p>If you run the previous code without <code>virtual ~IBase() {};</code>, you will see that the destructor <code>Tester::~Tester()</code> is never called.</p>
 

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