自增自减运算符的重载（强制类型转换运算符重载）

#include <iostream>

using namespace std;

class Ctype
{
private:
    int n;
public:
    Ctype(int m) :n(m) {};
    Ctype  operator ++(int);
    Ctype  operator ++();
    operator int();
};
Ctype  Ctype::operator++(int)
{
    Ctype tmp(*this);
    n++;
    return (tmp);
}
Ctype  Ctype::operator++()
{
    n++;
    return (*this);
}
Ctype::operator int()
{
    return n;
}
int main()
{
    Ctype c(6);
    cout << c++ << endl;
    cout << c << endl;
    cout << ++c << endl;
    return 0;
}