C++ program halts after dynamic memory allocation

Question

I'm having problem with a copying method in a simple C++ program. Everytime I call copy:

Sudoku::SudokuNode** Sudoku::copy(SudokuNode** sudokuBoard)
{
  SudokuNode** tempSudokuBoard = new SudokuNode*[9];
  for(int i = 0; i<9; i++)
  {
   tempSudokuBoard[i] = new SudokuNode[9];
   for(int j = 0; j<9; j++)
   {
    tempSudokuBoard[i][j].currentInteger = sudokuBoard[i][j].currentInteger;
    for(vector<int>::iterator iter = sudokuBoard[i][j].possibleIntegers.begin(); iter!= sudokuBoard[i][j].possibleIntegers.end();)
    {
     tempSudokuBoard[i][j].possibleIntegers.push_back(*iter);
    }
   }
  }
  return tempSudokuBoard;
}

The program seems to completely halt, not returning a a visible error.

If I try to debug the program, the debugger works fine until I arrive at the copy method. Then the debugger displays a dialog box saying:

There is no source code available for the current location.

Any idea what is wrong?

Answer 1

    for(vector<int>::iterator iter = sudokuBoard[i][j].possibleIntegers.begin(); iter!= sudokuBoard[i][j].possibleIntegers.end();)

You don't seem to be advancing the iterator in that loop, so it will never end. Add ++iter to the counting expression (after the last ; in the for loop).

As to why your debugger can't find source for that location, that's platform dependent. What debugger are you using?

Answer 2

You do not increase the iterator on the inside loop:

   for(vector<int>::iterator iter = sudokuBoard[i][j].possibleIntegers.begin(); iter!= sudokuBoard[i][j].possibleIntegers.end(); ++iter)

Resulting an infinate for loop (Compiler knows this and "optimized" it for an infinite loop, which is why there is no code available).

Answer 3

I suggest you recode it to use ...

class SudokuBoard
{
  SudokuNode nodes[9];
};