Question

I’m currently stuck with a legacy code using multiple dimensions arrays :

#define B 25
int Table[A][B][C][D][E][F];

I need to change the B constant by a dynamic value. The thing is, I need to keep the table the same way it used to be so that I won’t have anything else but the allocation du rewrite.

I’d like to have your ideas / comments on how to do such a thing.

Currently I’m trying to typedef the end of the table ([C][D][E]) to malloc it at allocation time, but I’m stuck with errors about the Table not being as legacy code wants it …

//int32_t Table[A][B][C][D][E][F];
int32_t* Table[A];

typedef int32_t type_1_t[E][F];
typedef type_1_t type_2_t[C][D];

for (int i = 0; i < A; i++)
  Table[i] = (int32_t*) malloc (sizeof (type_2_t) * dynamic_B);

Using this, I get an error (“error: subscripted value is neither array nor pointer nor vector”) when using the table.

XXX = Table [a][b][c][d][e][f];

Answer 1

You’ve got the wrong type:

int32_t* Table[A];

should be in fact

int32_t (*Table[A])[C][D][E][F];

or, as you typedef’d it

type_2_t *Table[A];

This should do the trick.