练习13.14 13.15 13.16

#include <string>
#include <iostream>
#include <vector>
#include <memory>

struct Numbered
{
    //! for ex13.14
    Numbered()
    {
        static unsigned i = 0;
        ++i;
        mySn = i;
    }

    //! for ex13.15

    Numbered(const Numbered&)
    {
        static unsigned j = 99;
        ++j;
        mySn = j;
    }

    unsigned mySn;
};

//void f (Numbered s)

//!
void f(const Numbered& s)
{
    std::cout << s.mySn << std::endl;
}
int main()
{
    Numbered a, b = a, c = b;

    f(a); f(b); f(c);

    return 0;
}