Problem with multi-dimensional array of pointers

[glennandrewcoop]

Ok, have a look at the following code, which is throwing up the error:

error C2440: '=' : cannot convert from 'screen::newDim * ' to 'screen::newDim'

in the header file, i have the following:

typedef customer* newDim;

in the source file, i have the following:

  //Set new row and columns pointer arrays
  
  newDim *seatXY = new newDim[x];


  for (int i=0; i<x; i++)
  {
    seatXY[i] = new newDim[y];
  }

x any y have obviously been set at this point, I just basically need a multi-dimensional array holding pointers to references of object customer.

Any help would be greatly appreciated!!

[Valmont]

This is how you could set up a basic matrix. Observe the very details!

#include <iostream>

using namespace std;

//--

int main()
{
  int** Matrix;
  unsigned nRows(3);
  unsigned nCols(4);
  
  Matrix = new int*[nRows];
  
  if (Matrix != 0) 
  { 
    for(unsigned i = 0; i < nRows; ++i) 
    { 
      Matrix[i] = new int[nCols]; 
    }
  }
  
  //Let's see how we delete them. Watch closely.
  for(unsigned i = 0; i < nRows; ++i) 
  { 
    delete[] Matrix[i]; 
  } 
  delete[] Matrix;
  
  return 0;
}

[glennandrewcoop]

Thanks for the above, it worked a treat, however, I've just developed my next problem:

I'm trying to allocate a customer object pointer to my int multi-dimensional array (as pointer addresses are int's), though its throwing up the following error:

error C2440: '=' : cannot convert from 'customer *' to 'int'


Here is the code for the function:

void setSeat(int,int, customer*);

void screen::setSeat(int xSeat, int ySeat, customer *cust)
{
  seatsXY[xSeat][ySeat] = cust;
}

[DJMaze]

use

PHP Code:

void** Matrix; 


void can mean anything so you may use

PHP Code:

void screen::setSeat(int xSeat, int ySeat, customer *cust)
{
  seatsXY[xSeat][ySeat] = (void*)cust;
} 


Or if you're 100% shure + it's called a lot + you want speed increase without "type" checking

PHP Code:

void screen::setSeat(int xSeat, int ySeat, customer *cust)
{
  seatsXY[xSeat][ySeat] = static_cast<void *>(cust);
} 


[Valmont]

No void* guys. Not in C++ without a jolly a good reason.

Glenn, just post the code please. Everything.