test tt=0 <=>test(0)

class test{
 int mvalue;
 public:
         test(int i){
                 cout << "test(int i) =" << i << endl;
                 mvalue = i;
         }
         int value(){
                 return mvalue;
         }
         test& operator++(){
                 ++mvalue;
                 return *this;
         }
         //后++
         int operator++(int){
                 cout << "int opertor++" << endl;
                 int ret = mvalue;
                 cout << "mvalue=" << mvalue << endl;//
                 mvalue++;
                 cout << "mvalue=" << mvalue << endl;//
                 cout << "ret=" << ret << endl;
                 return ret;
         }
 };
 int main(){
         test t();      //test(int i) = 0
         test tt = t++;  //int opertor++; mvalue=0;mvalue=1;ret=0;test(int i) = 0;

         cout << tt.value() << endl;     //
         cout << t.value() << endl;      //
         return ;
 //运行结果
 test(int i) =
 int opertor++
 mvalue=
 mvalue=
 ret=
 test(int i) =