bitmap array

[Sebastor]

Hi

I create bitmap array :

Graphics::TBitm ap ***bitmap;

bitmap = new Graphics::TBitm ap**[x];
for (int s=0;s<x;s++)
{
bitmap[s] = new Graphics::TBitm ap*[y];
for (int u=0;u<y;u++)
bitmap[s][u] = new Graphics::TBitm ap;
}

How can i delete this array ?

for (int s=0;s<x;s++)
{
for (int u=0;u<y;u++)
delete bitmap[s][u];
delete bitmap[s];
}

or I have to use "delete[]" command?

regards

Sebastor

[Victor Bazarov]

Sebastor wrote:

I create bitmap array :

Graphics::TBitm ap ***bitmap;

bitmap = new Graphics::TBitm ap**[x];
for (int s=0;s<x;s++)
{
bitmap[s] = new Graphics::TBitm ap*[y];
for (int u=0;u<y;u++)
bitmap[s][u] = new Graphics::TBitm ap;
Since individual element is created using "regular" 'new'...
}

How can i delete this array ?

for (int s=0;s<x;s++)
{
for (int u=0;u<y;u++)
delete bitmap[s][u];
You should use "regular" 'delete'
delete bitmap[s];
But since 'bitmap[s]' was created using 'new[]', you must use 'delete[]':

delete[] bitmap[s];
}
And you forgot to delete the 'bitmap' itself here...

or I have to use "delete[]" command?

Depends. See above.

V

[Bob Hairgrove]

On Fri, 27 Jan 2006 22:58:57 +0100, "Sebastor" <br********@one t.pl>
wrote:

Hi

I create bitmap array :

Graphics::TBit map ***bitmap;

bitmap = new Graphics::TBitm ap**[x];
for (int s=0;s<x;s++)
{
bitmap[s] = new Graphics::TBitm ap*[y];
for (int u=0;u<y;u++)
bitmap[s][u] = new Graphics::TBitm ap;
}

How can i delete this array ?

for (int s=0;s<x;s++)
{
for (int u=0;u<y;u++)
delete bitmap[s][u];
delete bitmap[s];
}

or I have to use "delete[]" command?

regards

Sebastor

The rule is, use delete[] wherever you used new[]. You used new[]
sometimes, and new at other times. Don't become confused by the array
subscripts, which have nothing to do with delete[].

--
Bob Hairgrove
No**********@Ho me.com

[Daniel T.]

In article <dr**********@o pal.icpnet.pl>,
"Sebastor" <br********@one t.pl> wrote:

Hi

I create bitmap array :

Graphics::TBitm ap ***bitmap;

bitmap = new Graphics::TBitm ap**[x];
for (int s=0;s<x;s++)
{
bitmap[s] = new Graphics::TBitm ap*[y];
for (int u=0;u<y;u++)
bitmap[s][u] = new Graphics::TBitm ap;
}

How can i delete this array ?

for (int s=0;s<x;s++)
{
for (int u=0;u<y;u++)
delete bitmap[s][u];
delete bitmap[s];
}

or I have to use "delete[]" command?

This is a great example why you should use the standard containers...

template < typename T >
class Array {
int _x;
std::deque< T > _array;
public:
Array( int x, int y ): _x( x ), _array( x * y ) { }
const T& operator()( int x, int y ) const {
return _array[ x * _x + y ];
}
T& operator()( int x, int y ) {
return _array[ x * _x + y ];
}
};

Now create your array:

Array< Graphics::TBitm ap > bitmap( x, y );

You get proper destruction as well as copy semantics for free.