[Newbies] The Bridge Playing example

Todd Blanchard tblanchard at mac.com
Mon Aug 25 15:46:13 UTC 2008

I don't have time to look at it today, but people interested in the  
best of both worlds should check out how Character and String works.   
There's only one instance of Character representing the letter 'a' in  
the whole system, but there are many letter 'a's.  String stores bytes  
for each character for compactness, but gives you back a Character  
object when you call at:.  It is worth looking at how.  The pattern is  
referenced in Object Design Patterns as 'Flyweight'.

-Todd Blanchard

On Aug 25, 2008, at 4:21 AM, Marcin Tustin wrote:

> For anyone who's interested, here's an implementation with the cards  
> represented as integers (or wrapping integers). Perhaps this could  
> be the basis of a super-compact representation. In any case, sorting  
> hands becomes simpler, but either dealing (creating a card object)  
> or checking that a play is legal becomes more involved (because at  
> some point you would have to reconstruct the symbolic information  
> regarding suit and rank).
> Alternatively, if you want to make the deck bridge-specific you  
> could change the undealt variable into an Array or  
> OrderedCollection, and after shuffling treat each of the quarters as  
> belonging to a specific hand. Again, more compact, less simplicity.  
> Taking something out of the hand could be represented by replacing  
> that card's integer with 0 in the deck/hand array.
> Another alternative would be to use an "ordinary" representation for  
> shuffling etc. then write that into a bit-packed representation with  
> each two bits representing a player, as the original questioner  
> wanted. Some utility classes could go over that to make handling  
> such a thing look like an array of players, and use a formatting  
> method similar to the one used in the attached code.
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