Delete pointer to 2d array

Question

I have a pointer to a 2d array of Robot class

Robot ***rob;

And below is my code for the constructor. The constructor works fine, but now I am trying to build a destructor to delete this pointer and it keeps on crashing the program!

My question is, how can I delete the pointer to the 2d array of robots?

RobotsWorld::RobotsWorld(int x , int y)
{
    X=x;Y=y; // returns the limitation of the matrix 
    rob = new Robot**[x];
    for(int i = 0; i < x; i++)
    {
        rob[i] = new Robot*[y];

        for(int j = 0; j < y; j++)
        {
            rob[i][j] = NULL;
        }
    }
}

you are doing one of the most dangerous things that you can do with a pointer, setting it to NULL when you are thinking about deleting it; you probably want to adopt the smart pointers and save yourself a lot of troubles. — user1802174
– user1802174, Commented Nov 23, 2012 at 16:58

bhuang3 · Accepted Answer · 2012-11-23 17:01:44Z

1

// Code is not tested
for(int i = 0 ; i < x ; ++i)
{
    for(int j = 0 ; j < y ; ++j)
    {
        delete rob[i][j];
    }
    delete[] rob[i];
}
delete[] rob;

By the way, why do you set rob[i][j] = NULL; ?

I think it should be : rob[i][j] = new double;

edited Nov 23, 2012 at 17:01

answered Nov 23, 2012 at 16:50

bhuang3

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1 Comment

Eassa Nassar Over a year ago

i tried doing that , but the program still crashes , when it enters the delete[] rob[i][j]; while the value is null it is cool , otherwise it crash :(

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