Re: anonymous static array

[Vijay Nayar]

Jesse's solution is correct, but I thought I'd throw in a
comment or two.

You are correct that the associative array is uninitialized
by default, and that you must initialize it.  For very small
static arrays, a simple array literal like [1, 2, 3] would
suffice, but for larger arrays, this is a pain.

Here you can take advantage of the ".init" property that every
data-type has in D.  For example, "float.init" is "NaN".  Static
arrays are a unique type (the type includes the size), and it
has a ".init" property as well.  Due to syntax constraints,
you must place the type in parenthesis to prevent the square
brackets from messing things up.

So instead of creating a temporary variable, you can do this:

void main() {
  int[100][string] bob;
  bob["happy"] = (int[100]).init;
  bob["happy"][20] = 3;
  assert(bob["happy"][20] == 3)
}

Have a good one,

 - Vijay

On Wed, 21 Mar 2012, Jesse Phillips wrote:

On Wednesday, 21 March 2012 at 10:51:05 UTC, Stephan wrote:

Hi,

I have an associative array with strings as keys and static arrays as values. When I access a new key, it gives me Range Error, so I think I should initialise the associative array, but how?

here is the code that fails:

int[100][string] counts;
counts["some_key"][20]++;
// core.exception.RangeError@freqSpec(26): Range violation


Thanks,

Stephan

   int[100][string] counts;
   int[100] a;
   counts["some_key"] = a;
   counts["some_key"][20]++;