#include <iostream>
using namespace std;

struct C
{
    int c;
    C(int i) : c{i} { if((i==10)and(j!=1))
        {
        std::cout << "C::C(" << i << ")" << std::endl;
        j=1;
        }
        else if(i!=10)
            std::cout << "C::C(" << i << ")" << std::endl;

                    }
    static C c0;
    static int j;
    static void f(C c);
};

int C::j=0;
C c1 = 0;
C C::c0 = 1;

void C::f(C c)
{
    C c2 = c.c;
}

int main()
{
    C::f(10);
    C::f(20);
    return 0;
}