[chuck-users] object / class hacking

Hans Aberg haberg at math.su.se
Wed Sep 30 09:52:18 EDT 2009

On 30 Sep 2009, at 14:26, Robert Poor wrote:

> Of course I'd love to use a hashmap.  But how do you get one in  
> Chuck?  AFIK, the existing chuckain "hash array" lacks a means to  
> iterate over its contents.

You want something like std::set, right? ONe can use the chuck  
associative arrays as follows:

int set[0];

1 => set["hello"];
1 => set["world"];

if (set["this"] == 1)
   <<< "ok" >>>;
   <<< "nope" >>>;

if (set["hello"] == 1)
   <<< "ok" >>>;
   <<< "nope" >>>;

I got the printout:
   $ chuck set.ck
   "nope" : (string)
   "ok" : (string)

It means that chuck treats an empty index as returning the int 0. So  
by setting the other entries to a non-zero value, one can make use of  
that implementation.

Insertion and deletion is easy. For deletion, just set the value to 0  
- it will remain there, but checks will say it is empty.

I couldn't find iterators for these associative arrays. I think they  
are implemented using std::map, though.


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