C++ Interview: "Why make a destructor virtual?" (60s Answer)

Описание: Base* p = new Derived(); delete p;
...So why is your C++ program still leaking memory? 🚨

​💥 THE PROBLEM:
If the base destructor (~Base()) is NOT virtual, only ~Base() is called.
~Derived() is NEVER called, leaking all of the child's resources!

​🚀 THE FIX:
Make the base class destructor virtual: virtual ~Base()

​✅ Why?
A virtual destructor uses the vtable to ensure the 'correct' destructor (~Derived()) is called FIRST, followed by ~Base().

​💡 RULE: In C++, if you use polymorphism, your base class destructor MUST be virtual.
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