Reference/Dereference Operators

[DJMaze]

I know there are:
& cast-expression
* cast-expression

And you can do things like:

char **array;

But somehow i have memory allocation problems.
I have a multidimensional array like:

┌──────┬──────┬──────┐
│string│string│string│ <= headers
├──────┼──────┼──────┤
│string│string│string│ <= cells
├──────┼──────┼──────┤
│string│string│string│ <= cells
└──────┴──────┴──────┘

but instead of strings i use classes and structures

PHP Code:

enum TColTypes { ctString, ctInteger, ctTime };

typedef struct Header {
  TColTypes Type;
  short Width;
  char *Text;
} * PHeader;

typedef struct Cell {
  char *Text;
} * PCell;

class GridRow
{
  private:
    Cell **Cells;
}

class Grid
{
  private:
    Header **Headers;
    GridRow **Rows;
} 


as you can see it has an array of headers like:

PHP Code:

Headers[0] = new Header; 


and an array of rows that contains cells

PHP Code:

Rows[0] = new GridRow;
Rows[0]->Cells[0] = new Cell; 


But whenever i try to realloc() the size of Headers and it seems i'm forced to recreate tmpHeaders and copy the data from Headers.
Sadly this is not an option because it could deal with 100MB of data and then it will be a pain and slow process.
So i've tried to use the following which somehow fails to copy the data properly.

PHP Code:

void __fastcall Grid::SetColCount(int Value)
{
  if (Value < 0) Value = 0;
  if (Value != fColCount) {
    // Destroy header collumns if the size gets less
    if (Value < fColCount) {
      for (int c=Value; c<fColCount; ++c) { delete Headers[c]; }
    }
    // A pointer has sizeof = 4
    Headers = (Header **)realloc(Headers, Value * 4); // <= issue here due to ** ?
    // Create header collumns if the size gets bigger
    if (Value > fColCount) {
      for (int c=fColCount; c<Value; ++c) { Headers[c] = new Header; }
    }
    fColCount = Value;
  }
} 


I use pointers instead of something like: Header *Headers[10]; because it is very dynamic and column swapping also occures.

Could someone explain me what goes wrong ?

[DJMaze]

nvm i'm a real ediot, i've overlooked one stupid line that crashes it completely :p

The above code works flawless there was an issue in my file reader that shifted to the next column (fColCount) to early.

Let me explain:

I read an file where i have each row on a line split with '\n' and each cell data is split with '\0'
The format of a header cell is "Title,150.0Ⓝ" and a function splits on each '\0' however where it needs to shift to the next column ('\0') it uses "++col" but ++col wasn't called on '\0' but right after title.

[Valmont]

Good you solved it. However, _fastcall and TCHAR are not part of the standard. Next time I'll move your posts if you do it again... .

[DJMaze]

There fixed TCHAR to char