Step 5 of 9

static members

A static data member belongs to the class, not to any one object. All objects share it. A static member function can be called without an object:

class Bot {
public:
    Bot() { count_++; }
    static int count() { return count_; }
private:
    static inline int count_ = 0;   // 'inline' lets you initialize it here
};

Bot a, b;
Bot::count();   // 2

Your turn: write a class Grenade that counts how many have ever been created (static int created()), and gives each one an int id() const in creation order starting at 1.

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