C++ Destructors with Vectors, Pointers,

std::vector and std::strings: Are they destroyed automatically?

Yes (assuming member variables are not pointers to std::vector and std::string).

If I have something like std::vector what happens when the vector destructor is called? Would it call automatically the destructor of myClass? Or only the vector is destroyed but all the Objects it contains are still existant in the memory?

If vector<MyClass> then all objects contained in the vector will be destroyed. If vector<MyClass*> then all objects must be explicitly deleted (assuming the class being destructed owns the objects in the vector). A third alternative is vector of smart pointers, like vector<shared_ptr<MyClass>>, in which case the elements of the vector do not need to be explictly deleted.

What happens if I have a pointer to another class inside a class

The B must be explicitly deleted. Again, a smart pointer could be used to handle the destruction of B.

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