C++ rule of three

C++ destructors are class members that remove an object . They are named when the class object is no longer in view, for example, when a method, a program, or a delete variable is called.

Destructors are usually used to deallocate memory and do other cleanup for a class object and its class members when the object is destroyed. A destructor is called for a class object when that object passes out of scope or is explicitly deleted.

A class needs a destructor when it “owns” a resource and is responsible for cleaning it up .

Unless you explicitly declare your own destructor, an implicitly generated destructor will be created for you by the compiler . If a class has no user-declared destructor, a destructor is implicitly declares as defaulted (8.4).