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How do you delete a multi-dimensional array?

Posted on 2004-08-27
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Last Modified: 2010-04-01
Hi,

I know to delete a normal array in a destructor is just

delete [] foo;

how do you delete a multi-dimensional array?

Thanks!
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Question by:CBMLude
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7 Comments
 
LVL 30

Expert Comment

by:Axter
ID: 11917957
>>how do you delete a multi-dimensional array?

You first need to iterate through each item in the array, and delete it.
0
 

Author Comment

by:CBMLude
ID: 11917974
ohhh.. okie so like this?

char board[4][4];


for (int i = 0; i < 4; i++)    
    delete [] board[i];

    delete [] board;
0
 
LVL 30

Accepted Solution

by:
Axter earned 80 total points
ID: 11917975
Example:

      for (int i = 0;i < size_of_foo;++i)
            delete [] foo[i];
      delete [] foo;
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Author Comment

by:CBMLude
ID: 11917984
heh.. just beat you to it... thanks!
0
 
LVL 30

Expert Comment

by:Axter
ID: 11917991
>>ohhh.. okie so like this?
>>char board[4][4];

No.
That is not a dynamic array.  That is a static variable, and you don't delete that type of variable.

0
 
LVL 30

Expert Comment

by:Axter
ID: 11918005
Example:
int** array2d;
int     n = 100;
int     m = 50;

array2d = new int*[n]; // allocating memory for array of pointers
for(int i = 0; i < n;i++)
   array2d[i] = new int[m];

for(int k = 0; k < n;k++)
    for(int j = 0; j < m;j++) array2d[k][j] = 0;

//free memory
for(i = 0; i < n;i++) delete[] array2d[i]; //free memory for each                                                           //pointer
delete[] array2d;    //delete array of pointers
0
 

Author Comment

by:CBMLude
ID: 11929913
okie say I have a multidimensional array in my private section of my class.  And I just created a new object

foo *a = new foo();

is my destructor this?

foo::~foo()
{
  for (int k=0; k < rowSize; k++)
  {
    delete [] bar[k];
  }
  delete [] bar
}
0

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