static members.

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#include <iostream>

class Test
{
protected:
    static int cpt;
public:
    Test() {cpt++;}
    int GetCpt() const {return cpt;}
};

int Test::cpt=0;

int main()
{
    Test a;
    Test b;
    std::cout << a.GetCpt() << " " << b.GetCpt() << std::endl;
    return 0;
}

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