exampleConst.cpp

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#include <iostream>

class A
{
public:
        explicit A(int i) : m_i(i){};

        void f() const { std::cout << "Using f() const: value i = " << m_i << std::endl; }

        void f() { std::cout << "Using f(): value i = " << ++m_i << std::endl; }

private:
        int m_i = 0;
};

int main()
{
        A a(1);
        a.f();

        const A b(1);
        b.f();
        return 0;
}