• Darcy Currey (12/12) Sep 08 2003 Apologies if this has been answered, but I couldn't find a reference.
• Mike Wynn (11/28) Sep 08 2003 x is an array of (assoc array which maps int[] to int)
• Helmut Leitner (30/48) Sep 09 2003 Perhaps this way:

Darcy Currey <Darcy_member pathlink.com> writes:

Apologies if this has been answered, but I couldn't find a reference.

I am trying to define an associative array, keyed on int[], of int[].
I have tried:
int[int[]][] x;

which compiles OK.

Attempting to use x causes errors.
int[4] y;
if(!y in x) {
x[y].length = 0; // initialise x[y]
}

What are your thoughts?

Darcy Currey

Mike Wynn <mike l8night.co.uk> writes:

Darcy Currey wrote:
 Apologies if this has been answered, but I couldn't find a reference.
 
 I am trying to define an associative array, keyed on int[], of int[].
 I have tried:
 int[int[]][] x;

x is an array of (assoc array which maps int[] to int)
this is not what you wanted.
D arrays declare are reversed so that
typedef foo[B] elem;
elem[A] x;
is the same as foo[B][A] x
unlike C where is would be
elem x[A] => foo x[A][B]

 
 which compiles OK.


 
 Attempting to use x causes errors.
 int[4] y;
 if(!y in x) {
 x[y].length = 0; // initialise x[y]
 }
 
 What are your thoughts?

try `int[][int[]] x;`

x is assoc array mapping int[] to int[]

 
 Darcy Currey

Helmut Leitner <helmut.leitner chello.at> writes:

Darcy Currey wrote:
 
 Apologies if this has been answered, but I couldn't find a reference.
 
 I am trying to define an associative array, keyed on int[], of int[].
 I have tried:
 int[int[]][] x;
 
 which compiles OK.
 
 Attempting to use x causes errors.
 int[4] y;
 if(!y in x) {
 x[y].length = 0; // initialise x[y]
 }
 
 What are your thoughts?
 
 Darcy Currey

Perhaps this way:

========================

int [][int[]] x;

int [4] y= [1,11,21,31];
int [4] z= [21,20,19,18];

int main() {

  x[y]=z;
  x[z]=y;

  int [][] keys=x.keys;
  int [] key;
  int [] val;

  for(int i=0; i<keys.length; i++) {
    key=keys[i];
    val=x[key];
    printf("%d: key: ",i);
       for(int j=0; j<key.length; j++) printf("%d ",key[j]);
    printf("val: ");
       for(int j=0; j<val.length; j++) printf("%d ",val[j]);
    printf("\n",i);
  }
  return 0;
}

=========================

Output:

  0: key: 1 11 21 31 val: 21 20 19 18 
  1: key: 21 20 19 18 val: 1 11 21 31 


-- 
Helmut Leitner    leitner hls.via.at
Graz, Austria   www.hls-software.com