Why if I delete the pointer to the base class I have a memory leak?
c++, memory-leaks, polymorphism
Solution
You need a virtual destructor in the base class so the destructor of the derived class is found and called at runtime. See this question and answer for more detail.
Problem
I have the `base` class and the class that inherits the `base` class: ``` class base { }; class derived : public base { std::string str; }; ``` I need to manage a `derived` class using the pointer to the `base` class, but the following code causes a memory leak: ``` base* ptr = new derived(); delete ptr; ``` Have I to cast `ptr`, or there are better alternatives?