• sa (12/12) Mar 08 2008 How to allocate an array of AA?
• bearophile (4/7) Mar 08 2008 It's a bug of DMD. I think you have to use a loop with a creation follow...
• sa (7/12) Mar 08 2008 append (~=) to the array.
• bearophile (19/20) Mar 08 2008 I think some sugar can be added to the language for this. In the meantim...

sa <no where.com> writes:

How to allocate an array of AA?

I tried two ways (new, and setting array length), in both cases the code
compiles, but the executable seems run into infinite loop, and never finish.

void allocAA() {
  int[int][] maps;
  maps = new int[int][3];
  maps.length = 3;
}

int main() {
  allocAA();

  return 0;
}

bearophile <bearophileHUGS lycos.com> writes:

sa Wrote:
 How to allocate an array of AA?
 I tried two ways (new, and setting array length), in both cases the code
 compiles, but the executable seems run into infinite loop, and never finish.

It's a bug of DMD. I think you have to use a loop with a creation followed by
an append (~=) to the array.

Bye,
bearophile

sa <no where.com> writes:

== Quote from bearophile (bearophileHUGS lycos.com)'s article
 sa Wrote:
 How to allocate an array of AA?
 I tried two ways (new, and setting array length), in both cases the code
 compiles, but the executable seems run into infinite loop, and never finish.

 It's a bug of DMD. I think you have to use a loop with a creation followed by
an

append (~=) to the array.


But how to write such 'a creation'? i.e. how to new an AA? what's the syntax?

tried:

  int[int]* mapsp;
  mapsp = new int[int];  // this line

The compiler complains: need size of rightmost array, not type int

bearophile <bearophileHUGS lycos.com> writes:

sa:
 But how to write such 'a creation'? i.e. how to new an AA? what's the syntax?

I think some sugar can be added to the language for this. In the meantime you
can use this from my D libs:

/***************************************
Return a new empty associative array of the given KeyType,ValueType.

Example: AA!(int, string);
*/
template AA(KeyType, ValueType) {
    const ValueType[KeyType] AA = AA_impl!(KeyType, ValueType).res;
}

private template AA_impl(KeyType, ValueType) {
    ValueType[KeyType] result;
    const ValueType[KeyType] res = result;
}

to be used as something as:

aaa char[int][];
foreach(_; xrange(10))
    aaa ~= AA!(int, char);

Bye,
bearophile