C++ base constructor

class Derived: public Base
{
public:
    double m_cost;
 
    Derived(double cost=0.0, int id=0)
        : Base{ id }, // Call Base(int) constructor with value id!
            m_cost{ cost }
    {
    }
 
    double getCost() const { return m_cost; }
};

Source: learncpp.com

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