How to let client using [i][j] access two dimension array?

fantasy1215 · 04-19-2012, 07:38 PM

I need to implement a class like a CMyResultSet class.
The client code which call CMyResultSet would look like this:

Code:

CMyResultSet res;
GetResultSet(res);
for (int i = 0; i < res.rows(); ++i)
{
    string res1 = res[i][0].tostring();
}

I have no idea how to implement [][] to let the client code calling like that. How would the method's prototype look like? And How can I save the searched result set in two dimension array, using std::vector or what?
Thanks in advance!
Sorry, I'm using C++!

Tinkster · 04-19-2012, 09:01 PM

People frequently find it helpful in supporting you if you mention
the language you're using (no, not English, the programming language).

TimothyEBaldwin · 04-24-2012, 11:41 AM

Overload [] to return a object on which [] is overloaded appropriately.

Something like:

Code:

CMyResultSetProxy operator [] (int x) {
  return CMyResultSetProxy(*this, x);
}

CMyResultSetProxy would be something like:

Code:

class CMyResultSetProxy {
  CMyResultSet& ref;
  int x;
 public:
  CMyResultSetProxy(CMyResultSet& ref1, int x1) : ref(ref), x(x1) {}
  string operator [] (int y);
};