#include <iostream>

class MyInt {
private:
    int x;
public:
    MyInt(int const y): x( y )
    { std::cout << "Constructor 1 called." << std::endl; }
    MyInt(MyInt const &y): x( y.x )
    { std::cout << "Constructor 2 called." << std::endl; }
};

int main(void)
{
    MyInt i = 1;

    return 0;
}

Constructor 1 called.
Constructor 2 called.