C / C++ / MFC

vector < vector < int > > Matrix;

int **array;
int i, j;

array = new int[4];           2*2=4
for( i = 0; i < 2; i++ )
{
  for( j = 0; j < 2; j++ )
  {
     array[i*2+j] = i;
     // ....
  }
}

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

<br />
// a general 2D array allocation function<br />
<br />
void **Alloc2DArray( int xdim, int xitmsize, int ydim, int yitmsize )<br />
	{<br />
	int		i;<br />
	int		x;<br />
	void **	data;<br />
<br />
	data = (void **)calloc( xdim, xitmsize );<br />
	if( data == NULL )<br />
		return NULL;<br />
	for( x = 0; x < xdim; x++ )<br />
		{<br />
		data[x] = calloc( ydim, yitmsize );<br />
		if( data[x] == NULL )<br />
			{<br />
			for( i = 0; i < x; i++ )   // free all we have so far<br />
				free( data[i] );<br />
			free( data );<br />
			return NULL;<br />
			}<br />
		}<br />
<br />
	return data;<br />
	}<br />
<br />
<br />
// a general 2d array release function<br />
<br />
void **Free2DArray( void **array, int xdim )<br />
	{<br />
	int		x;<br />
<br />
	if( array == NULL )<br />
		return NULL;		// sanity check<br />
<br />
	for( x = xdim - 1; x >= 0; x-- )<br />
		{<br />
		free( array[x] );<br />
		array[x] = NULL;<br />
		}<br />
	free( array );<br />
	return NULL;<br />
	}<br />
<br />
<br />
// a specialized two-dimensional matrix allocator<br />
// this function handles all casting for us.<br />
<br />
float **AllocFloatMatrix( int xdim, int ydim )<br />
	{<br />
	float **data = (float **)Alloc2DArray( xdim, sizeof( float * ),<br />
											ydim, sizeof( float ) );<br />
	return data;<br />
	}<br />
<br />
<br />
// a specialized two-dimensional matrix deallocator<br />
// this function handles all casting for us.<br />
<br />
float **FreeFloatMatrix( float **array, int xdim )<br />
	{<br />
	Free2DArray( (void **)array, xdim );<br />
	return NULL;<br />
	}<br />

In addition to the other link, info-zip has a lot of source code, and other information. (They claim that winZip is based on their code)

I'm not sure what I did there...

Anyway, info-zip at http://www.info-zip.org/pub/infozip/ has some more source.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)