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I don’t really know how to describe this, but this is the code:
class A : public std::vector<A>
{
};
//....
A a;
a.push_back(a);
What does it do and why would you do this?
This is curiously recurring template pattern(CRTP).
It allows you to implement static polymorphism.
However, it is a bad practice to use
std::vectoras a base class because it does not have a virtual destructor.