++运算符的重载前置与后置

#include <iostream>

using namespace std;
class counter{
public:
 counter() { v=0; }
 counter operator ++();  //前置
 counter operator ++(int );//后置
 void print() { cout<<v<<endl; }
private:
 unsigned v;
};

counter counter::operator ++()  //前置
{
 v++;
 return *this;
}

counter counter::operator ++(int)  //后置
{
 counter t;
 t.v = v++;
 return t;
}

void main()
{
 counter c;
 for(int i=0; i<8; i++)c++;
 c.print();for(i=0; i<8; i++)++c;
 c.print();
}