LinuxQuestions.org - Why double standard?

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Why double standard?

I'm trying learn gnu c++. And already found a problem. Why the following first code snippet complains but the other doesn't?

Code:

  int **aa = new int*[3];



  aa[0] = new int[2];



  *(*(aa + 0) + 0) = 1;



  cout << (*aa[0])[0] << endl; //complains about: error: invalid types `int[int]' for                            

                                //array subscript



--------------------------------------------------------------------------------------------------------------





  string *first_names[100];



  string first = "LLLL";



  first_names[0] = new string(first);



  cout << (*first_names[0])[0] << endl; //doesn't complain

I can access one array with this notation but not the other? Can anyone kindly explain?

Thanks.

aa[0] is of type int*
*aa[0] is of type int (and equivalent to aa[0][0])
firstnames[0] is of type string*
*firstnames[0] is of type string (and equivalent to firstnames[0][0])

std::string overloads operator[], int doesn't; that's why (*aa[0])[0] will give you an error.
You probably meant aa[0][0] (and firstnames[0][0]).

Thank you for clearing this up for me. I'm enjoyin' every moment of c++. Again thanks.